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Chen J, Duan R, Zhu B, Sun Y, Gao J. The impact of recycling polyaluminium chloride and anionic polyacrylamide water treatment residuals on heavy metal adsorption in soils: implications for stormwater bioretention systems. Water Sci Technol 2024; 89:1570-1582. [PMID: 38557719 DOI: 10.2166/wst.2024.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 02/29/2024] [Indexed: 04/04/2024]
Abstract
Despite the high adsorption capacity of polyaluminum chloride and anionic polyacrylamide water treatment residuals (PAC-APAM WTRs) for Pb2+, Cd2+, Cu2+, and Zn2+, their influence on the adsorption behavior of heavy metals in traditional bioretention soil media remains unclear. This study investigated the impact of PAC-APAM WTRs at a 20% weight ratio on the adsorption removal of Pb2+, Cd2+, Cu2+, and Zn2+ in three types of soils. The results demonstrated improved heavy metal adsorption in the presence of PAC-APAM WTRs, with enhanced removal observed at higher pH levels and temperatures. The addition of PAC-APAM WTRs augmented the maximum adsorption capacity for Pb2+ (from 0.98 to 3.98%), Cd2+ (from 0.52 to 10.99%), Cu2+ (from 3.69 to 36.79%), and Zn2+ (from 2.63 to 13.46%). The Langmuir model better described the data in soils with and without PAC-APAM WTRs. The pseudo-second-order model more accurately described the adsorption process, revealing an irreversible chemical process, although qe demonstrated improvement with the addition of PAC-APAM WTRs. This study affirms the potential of PAC-APAM WTRs as an amendment for mitigating heavy metal pollution in stormwater bioretention systems. Further exploration of the engineering application of PAC-APAM WTRs, particularly in field conditions for the removal of dissolved heavy metals, is recommended.
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Affiliation(s)
- Jing Chen
- Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
| | - Runbin Duan
- Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China E-mail:
| | - Bingzi Zhu
- Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
| | - Yao Sun
- Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
| | - Jiangqi Gao
- Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
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Wang M, Chen Q, Hua X, Yang R. Highly efficient isolation and purification of high-purity tea saponins from industrial camellia oil production by porous polymeric adsorbents. J Sci Food Agric 2023; 103:7006-7020. [PMID: 37319237 DOI: 10.1002/jsfa.12787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 04/24/2023] [Accepted: 06/11/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Recovery of high-purity tea saponin (TS), a promising non-ionic surfactant with well-documented properties, is one of the major challenges to broadening its industrial applications. In this study, an innovative and sustainable strategy for the highly-efficient purification of TS was developed by using well-designed highly-porous polymeric adsorbents. RESULTS The prepared Pp-A with controllable macropores (~96 nm) and appropriate surface hydrophobic properties was found more favorable for achieving high adsorption efficiency towards TS/TS-micelles. Kinetic results showed the adsorption follows the pseudo-second-order model (R2 = 0.9800), and the Langmuir model is more qualified to explicate the adsorption isotherms with Qe-TS ~ 675 mg g-1 . Thermodynamic studies revealed the monolayer adsorption of TS was an endothermic process that was conducted spontaneously. Interestingly, ethanol-driven desorption (90% v/v ethanol) of TS was rapidly (< 30 min) complete due to the possible ethanol-mediated disassembling of TS-micelles. A possible mechanism that involves the interactions between the adsorbents and TS/TS-micelles, the formation and disassembling of TS-micelles was proposed to account for the highly efficient purification of TS. Afterwards, Pp-A-based adsorption method was developed to purify TS directly from industrial camellia oil production. Through selective adsorption, pre-washing, and ethanol-driven desorption, the applied Pp-A enabled the direct isolation of high-purity TS (~96%) with a recovery ratio > 90%. Notably, Pp-A exhibited excellent operational stability and is of high potential for long-term industrial application. CONCLUSION Results ensured the practical feasibility of the prepared porous adsorbents in purifying TS, and the proposed methodology is a promising industrial-scale purification strategy. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Mingming Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Qiqi Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Xiao Hua
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Ruijin Yang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
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Fei YH, Deng H, Wu G, Luo M, Chen Y, Wang X, Ye H, Liu T. Insight into adsorption process and mechanisms of Cr(III) using carboxymethyl cellulose- g-poly(acrylic acid- co-acrylamide)/attapulgite composite hydrogel. Environ Technol 2023; 44:4173-4187. [PMID: 35611631 DOI: 10.1080/09593330.2022.2082325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 05/15/2022] [Indexed: 06/15/2023]
Abstract
Cr(III) as one of the most concerned potentially toxic elements, is discharged from relevant industries and Cr(VI) reduction. Hydrogel-based adsorption could be one of the promising approaches for Cr(III) removal. Featured with environmental friendliness and low cost, carboxymethyl cellulose (CMC) was employed for the hydrogel synthesis, and attapulgite (APT) could be used to strengthen its stability. However, the adsorption performance and mechanisms need to be examined. In the present study, carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide)/ attapulgite (CMC-g-p(AA-co-AM)/APT) was synthesised via in situ copolymerisation. Its efficacy for removing Cr(III) from an aqueous solution was investigated using batch adsorption experiments. Results showed that the introduction of APT enhanced the thermal stability but decreased the swelling performance of the hydrogel. The prepared hydrogel could strongly adsorb Cr(III) at a wide pH range of 3.0-7.0. Cr(III) can be efficiently removed by the composite hydrogel within 1-2 h. At low concentration, CMC-g-p(AA-co-AM)/APT could slightly adsorbed more Cr(III) than CMC-g-p(AA-co-AM). The maximum absorption of CMC-g-p(AA-co-AM) and CMC-g-p(AA-co-AM)/APT were 74.8 and 47.7 mg/g at 298 K, respectively. The negative value of ΔHo and ΔGo indicated the adsorption of Cr(III) onto the two studied hydrogels is an exothermic and spontaneous process. Ion exchange and complexation, as implied by EDS, FT-IR and XPS, combining with electrostatic attraction are the possible adsorption mechanisms for Cr(III) onto the prepared hydrogels. All the results above suggests that the composite hydrogel CMC-g-p(AA-co-AM)/APT can be a promising candidate for the removal of Cr(III) from waste water.
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Affiliation(s)
- Ying-Heng Fei
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, People's Republic of China
| | - Hongmei Deng
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, People's Republic of China
- Key Laboratory of Water Safety and Protection in Pearl River Delta, Ministry of Education, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, People's Republic of China
| | - Gaoyuan Wu
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, People's Republic of China
- Key Laboratory of Water Safety and Protection in Pearl River Delta, Ministry of Education, Guangzhou, People's Republic of China
| | - Mengting Luo
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, People's Republic of China
- Key Laboratory of Water Safety and Protection in Pearl River Delta, Ministry of Education, Guangzhou, People's Republic of China
| | - Yongheng Chen
- Key Laboratory of Water Safety and Protection in Pearl River Delta, Ministry of Education, Guangzhou, People's Republic of China
| | - Xiaohuan Wang
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang, People's Republic of China
| | - Hengpeng Ye
- School of Chemistry and Materials, South-Central University for Nationalities, Wuhan, People's Republic of China
| | - Tao Liu
- School of Civil and Engneering, Guangzhou University, Guangzhou, People's Republic of China
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Zhao Y, Zhao Y, Gong Q, Wang Z. Graph Transformer with Convolution Parallel Networks for Predicting Single and Binary Component Adsorption Performance of Metal-Organic Frameworks. ACS Appl Mater Interfaces 2023; 15:49527-49537. [PMID: 37831093 DOI: 10.1021/acsami.3c10951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2023]
Abstract
Metal-organic frameworks (MOFs) are considered one of the most important materials for carbon capture and storage (CCS) due to the advantages of porosity, multifunction, diverse structure, and controllable chemical composition. With the continuous development of artificial intelligence (AI) technology, more and more machine learning models are used to identify MOFs with high performance within a massive search space. However, current works have yet to form a model that uses graph-structured data only, which can predict the adsorption properties of single and binary components. In this work, we proposed and developed a graph transformer, combined with convolution parallel networks, called GC-Trans. The model can accurately and efficiently predict the adsorption performance of MOFs under the single- and binary-component adsorption conditions using only the features of the crystal diagram as inputs. By extracting and fusing local and global feature information, the model has stronger expression and generalization abilities. Thus, we used it to screen the ARC-MOF database and analyze the MOF structures that meet the target requirements. Additionally, to demonstrate the transferability of the model, we applied transfer learning methods to predict the CO2/CH4 separations and CH4 uptake, both of which showed good predictive performance.
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Affiliation(s)
- Yiming Zhao
- Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
- Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China
| | - Yongjia Zhao
- Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
- Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China
| | - Qihan Gong
- Fundamental Science & Advanced Technology Lab, PetroChina Petrochemical Research Institute, China National Petroleum Corporation, Beijing 102200, China
| | - Zhuo Wang
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
- Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China
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Liu GC, Zhang XW, Xin SS, Wang QW, Yan QH, Zhou CZ, Xin YJ. [Adsorption Characteristics of Tetracycline by CuFeO 2-modified Biochar]. Huan Jing Ke Xue 2023; 44:5222-5230. [PMID: 37699840 DOI: 10.13227/j.hjkx.202209299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/14/2023]
Abstract
CuFeO2-modified biochars were prepared through co-precipitation and hydrothermal methods, and the composites had high efficiency removal for tetracycline (TC) from water. The CuFeO2-modified biochar with a 2:1 mass ratio of CuFeO2 to BC450 (CuFeO2/BC450=2:1) demonstrated the best adsorption performance. The kinetic process of TC adsorption by CuFeO2/BC450=2:1 was well fitted with the intraparticle diffusion model, suggesting that the adsorption process was controlled by film and pore diffusion. Under the condition of neutral pH and 298 K, the maximum adsorption capacity of the Langmuir model of CuFeO2/BC450=2:1 was 82.8 mg·g-1, which was much greater than that of BC450 (13.7 mg·g-1) and CuFeO2(14.8 mg·g-1). The thermodynamic data suggested that TC sorption onto CuFeO2/BC450=2:1 was a spontaneous and endothermic process. The removal of TC by CuFeO2/BC450=2:1 increased first and then decreased with increasing pH, and the maximum adsorption occurred under the neutral condition. The strong adsorption of TC by CuFeO2/BC450=2:1 could be attributed to better porosity, larger specific surface area, and more active sites (e.g., functional groups and charged surfaces). This work provided an efficient magnetic adsorbent for removing antibiotics.
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Affiliation(s)
- Guo-Cheng Liu
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Xin-Wang Zhang
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai-Shuai Xin
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Qian-Wen Wang
- Instrumental Analysis Center of Qingdao Agricultural University, Qingdao 266109, China
| | - Qing-Hua Yan
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Cheng-Zhi Zhou
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Yan-Jun Xin
- College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
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Liu T, Li J, Lei H, Zhen X, Wang Y, Gou D, Zhao J. Preparation of Chitosan/β-Cyclodextrin Composite Membrane and Its Adsorption Mechanism for Proteins. Molecules 2023; 28:molecules28083484. [PMID: 37110716 PMCID: PMC10143531 DOI: 10.3390/molecules28083484] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/12/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
A significant portion of the protein in food waste will contaminate the water. The chitosan/modified β-cyclodextrin (CS/β-CDP) composite membranes were prepared for the adsorption of bovine serum albumin (BSA) in this work to solve the problem of poor adsorption protein performance and easy disintegration by a pure chitosan membrane. A thorough investigation was conducted into the effects of the preparation conditions (the mass ratio of CS and β-CDP, preparation temperature, and glutaraldehyde addition) and adsorption conditions (temperature and pH) on the created CS/β-CDP composite membrane. The physical and chemical properties of pure CS membrane and CS/β-CDP composite membrane were investigated. The results showed that CS/β-CDP composite membrane has better tensile strength, elongation at break, Young's modulus, contact angle properties, and lower swelling degree. The physicochemical and morphological attributes of composite membranes before and after the adsorption of BSA were characterized by SEM, FT-IR, and XRD. The results showed that the CS/β-CDP composite membrane adsorbed BSA by both physical and chemical mechanisms, and the adsorption isotherm, kinetics, and thermodynamic experiments further confirmed its adsorption mechanism. As a result, the CS/β-CDP composite membrane of absorbing BSA was successfully fabricated, demonstrating the potential application prospect in environmental protection.
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Affiliation(s)
- Tong Liu
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Junbo Li
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Hongyu Lei
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Xinyu Zhen
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Yue Wang
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Dongxia Gou
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
| | - Jun Zhao
- College of Food Science and Engineering, Changchun University, Changchun 130022, China
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Chen Z, Jiang X, Zhang Y, Li W, Tang Z, Liu Y, Zhao L. Inorganic Skeleton Reinforcement-A Generic Approach to Improve the Mechanical Properties of Biochar. Nanomaterials (Basel) 2023; 13:1298. [PMID: 37110884 PMCID: PMC10145767 DOI: 10.3390/nano13081298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/02/2023] [Accepted: 04/04/2023] [Indexed: 06/19/2023]
Abstract
Biochar is considered as a promising candidate for emerging sustainable energy systems and environmental technology applications. However, the improvement of mechanical properties remains challenges. Herein, we propose a generic strategy to enhance the mechanical properties of bio-based carbon materials through inorganic skeleton reinforcement. As a proof-of-concept, silane, geopolymer, and inorganic gel are selected as precursors. The composites' structures are characterized and an inorganic skeleton reinforcement mechanism is elucidated. Specifically, two types of reinforcement of the silicon-oxygen skeleton network formed in situ with biomass pyrolysis and the silica-oxy-al-oxy network are constructed to improve the mechanical properties. A significant improvement in mechanical strength was achieved for bio-based carbon materials. The compressive strength of well-balanced porous carbon materials modified by silane can reach up to 88.9 kPa, geopolymer-modified carbon material exhibits an enhanced compressive strength of 36.8 kPa, and that of inorganic-gel-polymer-modified carbon material is 124.6 kPa. Moreover, the prepared carbon materials with enhanced mechanical properties show excellent adsorption performance and high reusability for organic pollutant model compound methylene blue dye. This work demonstrates a promising and universal strategy for enhancing the mechanical properties of biomass-derived porous carbon materials.
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Affiliation(s)
- Zhikai Chen
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Xiaoli Jiang
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Yagang Zhang
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Wei Li
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Zhiqiang Tang
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Yanxia Liu
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Lin Zhao
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
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8
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Zhu Z, Wang S, Zhong Y, You Q, Gao J, Cui S, Shen X. Spherical Attapulgite/Silica Aerogels Fabricated via Different Drying Methods with Excellent Adsorption Performance. Materials (Basel) 2023; 16:2292. [PMID: 36984172 PMCID: PMC10057850 DOI: 10.3390/ma16062292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/09/2023] [Accepted: 03/09/2023] [Indexed: 06/18/2023]
Abstract
Dye wastewater has caused great harm to the environment, which is an urgent problem to be solved. As typical three-dimensional porous materials, aerogels have attracted great interest in dye wastewater treatment. In this work, spherical attapulgite/silica (ATP/SiO2) gels were initially prepared by easily scalable sol-gel dripping methods and then dried to aerogels with three drying techniques, namely, supercritical CO2 drying (SCD), freeze-drying (FD), and ambient pressure drying (APD). The effect of the drying techniques and heat-treated temperature on the physical characteristic, morphological properties, microstructure, and chemical structure of the spherical ATP/SiO2 aerogels were investigated. The macroscopic morphology of the spherical ATP/SiO2 aerogels was homogeneous and integrated without local cracking. The average pore diameter and specific surface area of the spherical ATP/SiO2 aerogels prepared by the three drying techniques were in the range of 6.8-8.6 nm and 218.5-267.4 m2/g, respectively. The heat treatment temperature had a significant effect on the pore structure and the wetting properties of the aerogels. The 600 °C heat-treated aerogels were subjected to adsorption tests in methylene blue (MB) solution (60 mg/g, 100 mL), which exhibited a great adsorption capacity of 102.50 mg/g. Therefore, the resulting spherical ATP/SiO2 aerogels possessed multipath preparation and exhibited an efficient adsorption performance, with the potential to be applied as an adsorbent for dye wastewater.
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Affiliation(s)
- Zhixiang Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
| | - Shengyuan Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
| | - Ya Zhong
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
- Suqian Advanced Materials Industry Technology Innovation Center, Nanjing Tech University, Suqian 223800, China
| | - Qi You
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
| | - Jun Gao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China
| | - Sheng Cui
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
| | - Xiaodong Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
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Tian J, Guo K, Sun Y, Lin R, Chen T, Zhang B, Liu Y, Yang T. Solvent-Free Synthesis of Magnetic Sewage Sludge-Derived Biochar for Heavy Metal Removal from Wastewater. Int J Environ Res Public Health 2022; 20:155. [PMID: 36612475 PMCID: PMC9820038 DOI: 10.3390/ijerph20010155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/15/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
The commonly used two-step and one-pot synthesis methods for producing biochar require the use of iron salt solutions, resulting in the undesirable consequences of energy consumption for dewatering and potential pollution risks. To address this drawback, a magnetic sewage sludge-derived biochar (MSBC-2) was synthesized by a solvent-free method in this study. The pseudo-second-order kinetic model and Langmuir model provided the best fit to the experimental data, implying a monolayered chemisorption process of Pb2+, Cd2+and Cu2+ onto MSBC-2. As the reaction temperature increased from 25 °C to 45 °C, the maximum adsorption capacities increased from 113.64 mg·g−1 to 151.52 mg·g−1 for Pb2+, from 101.01 mg·g−1 to 109.89 mg·g−1 for Cd2+ and from 57.80 mg·g−1 to 74.07 mg·g−1 for Cu2+, respectively. Thermodynamic parameters (ΔG0 < 0, ΔS0 > 0, ΔH0 > 0) revealed that the adsorption processes of all three metals by MSBC-2 were favourable, spontaneous and endothermic. Surface complexation, cation-π interaction, ion exchange and electrostatic attraction mechanisms were involved in the adsorption of Pb2+, Cd2+ and Cu2+ onto MSBC-2. Overall, this study will provide a new perspective for the synthesis of magnetic biochar and MSBC-2 shows great potential as an adsorbent for heavy metal removal.
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Affiliation(s)
- Jiayi Tian
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Kexin Guo
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Yucan Sun
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Ruoxi Lin
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Tan Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Bing Zhang
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Yifei Liu
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
| | - Ting Yang
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
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Su Y, Shi Y, Jiang M, Chen S. One-Step Synthesis of Nitrogen-Doped Porous Biochar Based on N-Doping Co-Activation Method and Its Application in Water Pollutants Control. Int J Mol Sci 2022; 23. [PMID: 36498946 DOI: 10.3390/ijms232314618] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/11/2022] [Accepted: 11/17/2022] [Indexed: 11/24/2022] Open
Abstract
In this work, birch bark (BB) was used for the first time to prepare porous biochars via different one-step methods including direct activation (BBB) and N-doping co-activation (N-BBB). The specific surface area and total pore volume of BBB and N-BBB were 2502.3 and 2292.7 m2/g, and 1.1389 and 1.0356 cm3/g, respectively. When removing synthetic methyl orange (MO) dye and heavy metal Cr6+, both BBB and N-BBB showed excellent treatment ability. The maximum adsorption capacities of BBB and N-BBB were 836.9 and 858.3 mg/g for MO, and 141.1 and 169.1 mg/g for Cr6+, respectively, which were higher than most previously reported biochar adsorbents. The probable adsorption mechanisms, including pore filling, π-π interaction, H-bond interaction, and electrostatic attraction, supported the biochars' demonstrated high performance. In addition, after five recycles, the removal rates remained above 80%, which showed the high stability of the biochars. This work verified the feasibility of the one-step N-doping co-activation method to prepare high-performance biochars, and two kinds of biochars with excellent performance (BBB and N-BBB) were prepared. More importantly, this method provides new directions and ideas for the development and utilization of other biomasses.
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Lan T, Li P, Li X, Guo J, Huang Q, Geng J, Zhao Q, Yang W, Guo S. Influence of modulus of alkaline activator on the removal of Pb 2+ by mesoporous geopolymer adsorbent. Environ Technol 2022; 43:4269-4278. [PMID: 34152255 DOI: 10.1080/09593330.2021.1946597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 06/01/2021] [Indexed: 06/13/2023]
Abstract
In this study, we synthesised metakaolin-based mesoporous geopolymer adsorbent and investigated the effect of alkaline activator modulus (molar ratios of SiO2/Na2O) on Pb2+ adsorption. The geopolymer prepared using 1.2 M alkaline activator performs excellent Pb2+ removal with a maximum adsorption capacity of 172.71 mg g-1. The pseudo-second-order model fit the adsorption kinetics satisfactorily, indicating that the adsorption process is dominated by chemical adsorption. The adsorption data appropriately fit the Langmuir isotherm model. The contributions of adsorption methods corresponding to the total quantity adsorbed declined in the following order: EDTA extraction (formation of Pb aluminium oxide and Pb-containing amorphous materials) > residual fraction (Pb stabilisation in the tetrahedral aluminosilicate network) > ion exchange. Overall, the alkaline activator modulus significantly influenced the Pb2+ adsorption characteristics of the geopolymer adsorbent.
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Affiliation(s)
- Tian Lan
- College of Land Science and Technology, China Agricultural University, Beijing, People's Republic of China
- School of Environment, Tsinghua University, Beijing, People's Republic of China
| | - Pinfang Li
- College of Land Science and Technology, China Agricultural University, Beijing, People's Republic of China
| | - Xiangling Li
- College of Land Science and Technology, China Agricultural University, Beijing, People's Republic of China
| | - Jingting Guo
- Beijing Environmental Engineering Technology Co., Ltd, Beijing, People's Republic of China
| | - Qian Huang
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, People's Republic of China
- Zhejiang Allianz Testing Technology Service Co., Ltd, Hangzhou People's Republic of China
| | - JianJian Geng
- Yunnan Institute of Tropical Crops, Jinghong, Yunnan, People's Republic of China
| | - Qingjie Zhao
- College of Forestry, Hainan University, Haikou, People's Republic of China
| | - Wei Yang
- College of Land Science and Technology, China Agricultural University, Beijing, People's Republic of China
| | - Shiwen Guo
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, People's Republic of China
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12
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Lv B, Xu J, Kang H, Liang P, Wang W, Tao F. Adsorption Behavior of Magnetic Carbon-Supported Metal Nickel for the Efficient Dye Removal from Water. Int J Environ Res Public Health 2022; 19:ijerph19031682. [PMID: 35162710 PMCID: PMC8835217 DOI: 10.3390/ijerph19031682] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 01/28/2022] [Accepted: 01/30/2022] [Indexed: 11/16/2022]
Abstract
Magnetic carbon-supported metal nickel has been successfully synthesized by solvothermal method and heat treatment for highly effective adsorption of various reactive dyes. Structure characterization and composition analysis demonstrated that the metal nickel nanoparticles with the size of 1–2 nm were embedded into the pore of carbon spheres. It is helpful to prevent the agglomeration and falling off of metal nickel nanoparticles on the surface of carbon spheres. The adsorption performance of the carbon-supported metal nickel nanospheres for reactive brilliant yellow R-4GLN was studied by changing the pH value and initial concentration of the solution, adsorption time, adsorption temperature, and the amount of adsorbent. The carbon-supported metal nickel showed fast and efficient adsorption activity. After 5 min of adsorption, the removal efficiency of 10 mL 25 mg·mL−1 reactive brilliant yellow R-4GLN was close to 100%. The carbon-supported metal nickel composite was reused 20 times, and the removal efficiency of dye remained above 98%. It also showed good adsorption performance on various reactive dyes with wide universality, which has a certain adsorption effect on most dyes with a high utilization value in wastewater treatment.
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Affiliation(s)
- Beifeng Lv
- School of Civil Engineering, Shaoxing University, Shaoxing 312000, China; (B.L.); (W.W.)
| | - Jingjing Xu
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China; (J.X.); (P.L.)
| | - Haibo Kang
- School of Civil Engineering, College of Transportation Engineering, Nanjing Tech University, Nanjing 210009, China;
| | - Pengfei Liang
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China; (J.X.); (P.L.)
| | - Wei Wang
- School of Civil Engineering, Shaoxing University, Shaoxing 312000, China; (B.L.); (W.W.)
| | - Feifei Tao
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China; (J.X.); (P.L.)
- Correspondence:
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13
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Meng Y, Ju T, Meng F, Han S, Song M, Jiang J. Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO 2 Adsorbents. ACS Appl Mater Interfaces 2021; 13:54018-54031. [PMID: 34727694 DOI: 10.1021/acsami.1c17132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The emerging polyethylenimine (PEI)-functionalized solid adsorbents have witnessed significant development in the implementation of CO2 capture and separation because of their decent adsorption capacity, recyclability, and scalability. As an indispensable substrate, the importance of selecting porous solid supports in PEI functionalization for CO2 adsorption was commonly overlooked in many previous investigations, which instead emphasized screening amine types or developing complex porous materials. To this end, we scrutinized the critical role of different commercial porous supports (silica, alumina, activated carbon, and polymeric resins) in PEI impregnation in this study, taking into account multiple perspectives. Hereinto, the present results identified that abundant larger pore structures and surface functional groups were conducive to loading a considerable amount of PEI molecules. Various supports after PEI functionalization had great differences in adsorption capacities, amine efficiencies, and the corresponding optimal temperatures. In addition, more attention was paid to the role of porous supports in long-term stability during the consecutive adsorption-regeneration cycles, while N2 and CO2 purging as regeneration strategies, respectively. Especially, CO2-induced degradation due to urea species formation was specifically recognized in a SiO2-based adsorbent, which would induce serious concerns in CO2 cyclic capture. On the other side, we also confirmed that adopting conventional porous supports, for example, HP20, could achieve superior adsorption performance (above 4 mmol CO2/g) and cyclic stability (around 1% loss after 30 cycles) rather than the ones synthesized through complex approaches, which ensured the availability and scalability of PEI-functionalized CO2 adsorbents.
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Affiliation(s)
- Yuan Meng
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Tongyao Ju
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Fanzhi Meng
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Siyu Han
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Mengzhu Song
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Jianguo Jiang
- School of Environment, Tsinghua University, Beijing 100084, China
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Liao D, Shi W, Gao J, Deng B, Yu R. Modified Camellia oleifera Shell Carbon with Enhanced Performance for the Adsorption of Cooking Fumes. Nanomaterials (Basel) 2021; 11:1349. [PMID: 34065455 DOI: 10.3390/nano11051349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 04/29/2021] [Accepted: 05/11/2021] [Indexed: 11/17/2022]
Abstract
Using Camellia oleifera shell (COS) as a raw material and phosphoric acid as the activator, activated Camellia oleifera shell carbon (COSC-0) was prepared and then modified by Fenton’s reagent (named as COSC-1). SEM, GC-MS, FTIR, and specific surface area and pore analyzers were used to study the adsorption performance of COS, COSC-0, and COSC-1 on cooking fumes. Results showed that COSC-1 was the best adsorbent compared with COS and COSC-0. The adsorption quantity and penetrating time of COSC-1 were 44.04 mg/g and 4.1 h, respectively. Most aldehydes could be adsorbed by COSC-1, which was due to the large number of carbonyl and carboxyl groups generated on the surface of COSC-1 from the action of Fenton’s reagent. The adsorption effect of COSC-1 on different types of pollutants in cooking fumes was analyzed based on the similar compatibility principle. COSC-1 showed a much higher adsorption effect on the strong polarity functional groups than on weak polar groups. The results provide a theoretical basis for the application of Camellia oleifera shell carbon adsorption technology in the treatment of cooking fumes.
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Liu Z, Zhao B, Huang Y, Qi X, Lou F. Cooling Capacity Test for MIL-101(Cr)/CaCl 2 for Adsorption Refrigeration System. Molecules 2020; 25:molecules25173975. [PMID: 32878238 PMCID: PMC7504781 DOI: 10.3390/molecules25173975] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 11/16/2022] Open
Abstract
An MIL-101(Cr) powder material was successfully prepared using the hydrothermal synthesis method, and then the original MIL-101(Cr) was combined with different mass fractions of CaCl2 using the immersion method to obtain a MIL-101(Cr)/CaCl2 composite material. The physical properties of the adsorbent were determined by X-ray powder diffraction (XRD), an N2 adsorption desorption isotherm test, and thermogravimetric analysis (TG). The water vapor adsorption performance of the metal-organic frameworks MOFs was tested with a gravimetric water vapor adsorption instrument to analyze its water vapor adsorption mechanism. Based on the SIMULINK platform in the MATLAB software, a simulation model of the coefficient of performance (COP) and cooling capacity of the adsorption refrigeration system was established, and the variation trends of the COP and cooling capacity of the adsorption refrigeration system under different evaporation/condensation/adsorption/desorption temperatures was theoretically studied. MIL101-(Cr)/CaCl2-20% was selected as the adsorption material in the adsorption refrigeration system through the physical characterization of composite materials with different CaCl2 concentrations by means of adsorption water vapor test experiments. A closed adsorption system performance test device was built based on the liquid level method. The cooling power per unit and adsorbent mass (COP and SCP) of the system were tested at different evaporation temperatures (288 K/293 K/298 K); the adsorption temperature was 298 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that COP and SCP increased with the increase in the evaporation temperature. When the evaporation temperature was 298 K, the level of COP was 0.172, and the level of SCP was 136.9 W/kg. The COP and SCP of the system were tested at different adsorption temperatures (293 K/298 K/303 K); the evaporation temperature was 288 K, the condensation temperature was 308 K, and the desorption temperature was 353 K. The experimental results showed that the levels of COP and SCP decreased with the increase in the adsorption temperature. When the adsorption temperature was 293 K, the level of COP was 0.18, and the level of SCP was 142.4 W/kg.
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Affiliation(s)
- Zhongbao Liu
- Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan Road, Chaoyang, Beijing 100124, China; (B.Z.); (F.L.)
- Correspondence: ; Tel./Fax: +86-010-67391613
| | - Banghua Zhao
- Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan Road, Chaoyang, Beijing 100124, China; (B.Z.); (F.L.)
| | - Yong Huang
- Suzhou Sujing Anfa Air Conditioning Co. LTD, 2 Weixin Road, Suzhou Industrial Park, Suzhou 215112, China;
| | - Xin Qi
- China Household Electric Appliance Research Institute, 6 Yuetan beixiao Str, Xicheng, Beijing 100037, China;
| | - Fengfei Lou
- Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan Road, Chaoyang, Beijing 100124, China; (B.Z.); (F.L.)
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Deng G, Deng X, Deng J, Lu X, Kang X, Song Y. Performance Evaluation of an Electrospun Nanofiber Mat as Samplers for the Trap of Trace Heavy Metals in Atmospheric Particles and Its Application. ANAL SCI 2020; 36:1453-1459. [PMID: 32741954 DOI: 10.2116/analsci.20p199] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Traditional methods for the analysis of trace heavy metals in the atmosphere require collecting atmospheric particles on filter substrates, such as cellulose, quartz fiber member, etc. In this paper, we report on a different filter to capture trace heavy metals in atmospheric particulates. Four kinds of electrospun nanofiber filters, polystyrene (PS), polystyrene-dithizone (PS-DZ), acrylic acid (AR), and acrylic acid-dithizone (AR-DZ) were produced by electrospinning, and used as filters to trap heavy metals in atmospheric particles. Based on these nanofiber filters, the digestion method and eluent were optimized. Under the optimal conditions (oscillation extraction with acetic acid-potassium acetate (HAC-KAC) buffer solution (0.1 mol L-1, pH = 4.5)), the developed method was successfully applied to determine the four particulate metal elements (As, Cd, Hg, and Pb) in air in two urban areas of Suzhou, China. Furthermore, a correlation between heavy metals in air and breast milk was observed. The results confirmed that an electrospun nanofiber mat could be a potential candidate for the sampling of heavy metals in atmospheric particles with higher efficiency.
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Affiliation(s)
- Guozhe Deng
- Key Laboratory of Child Development and Learning Science of Ministry of Education of China, School of Biological Science and Medical Engineering, Southeast University
| | | | | | - Xiaoting Lu
- Division of Child Care, Suzhou Municipal Hospital
| | - Xuejun Kang
- Key Laboratory of Child Development and Learning Science of Ministry of Education of China, School of Biological Science and Medical Engineering, Southeast University
| | - Yuan Song
- Division of Child Care, Suzhou Municipal Hospital
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Wu X, Ge T, Dai Y, Wang R. Vegetal fiber paper matrix impregnated with silica gel for benzene removal. Indoor Air 2019; 29:943-955. [PMID: 31444988 DOI: 10.1111/ina.12598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/19/2019] [Accepted: 08/20/2019] [Indexed: 06/10/2023]
Abstract
Removing benzene from indoor space plays an important role in indoor air purification. A novel filter with vegetal fiber paper (VFP) as matrix hosting silica gel is proposed in this paper for benzene removal. In order to investigate the feasibility and performance of this idea, firstly, three pieces of VFP samples impregnated with different amounts of silica gel are fabricated and their benzene adsorption quantities are tested. The results show that three times is recommended as the optimal number for impregnating. The VFP sample impregnated with silica gel after the third impregnating exhibits commendable coating stability and good benzene adsorption performance. Additionally, at low relative pressure (Pb /Ps ≤ 0.05), the experimental data of benzene adsorption isotherms fit well with the Langmuir model with R2 greater than 0.97. Then, two actual filters made of VFP impregnated with silica gel after the third impregnating were fabricated. It is found that the pressure drop of the actual filter is only 1200 Pa/m when the air velocity is 2 m/s. Besides, the one-pass efficiency of the filter can reach to 19.44%. It is expected that the silica gel coated on the filter can be modified to improve the purification performance of the filter.
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Affiliation(s)
- Xuannan Wu
- Key Laboratory of Power Mechanical Engineering, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, MOE, Shanghai, P.R. China
| | - Tianshu Ge
- Key Laboratory of Power Mechanical Engineering, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, MOE, Shanghai, P.R. China
| | - Yanjun Dai
- Key Laboratory of Power Mechanical Engineering, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, MOE, Shanghai, P.R. China
| | - Ruzhu Wang
- Key Laboratory of Power Mechanical Engineering, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, MOE, Shanghai, P.R. China
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18
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Tang Q, Li N, Lu Q, Wang X, Zhu Y. Study on Preparation and Separation and Adsorption Performance of Knitted Tube Composite β-Cyclodextrin/Chitosan Porous Membrane. Polymers (Basel) 2019; 11:polym11111737. [PMID: 31652903 PMCID: PMC6918326 DOI: 10.3390/polym11111737] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 10/13/2019] [Accepted: 10/21/2019] [Indexed: 11/16/2022] Open
Abstract
In order to obtain membranes with both organic separation and adsorption functions, knitted tube composite β-cyclodextrin/chitosan (β-CD/CS) porous membranes were prepared by the non-solvent induced phase separation (NIPS) method using CS and β-CD as a membrane-forming matrix, glutaraldehyde as crosslinking agent to improve water stability, and knitted tube as reinforcement to enhance the mechanical properties. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), contact angle, water flux, bovine serum albumin (BSA) rejection and tensile test were carried out. The FTIR demonstrated that the β-CD and CS had been successfully crosslinked. With the crosslinking time increased, the membrane structure became denser, the contact angle and the rejection rate increased, while the water flux decreased. The strength and elongation at a break were 236 and 1.7 times higher than these of bare β-CD/CS porous membranes, respectively. The strength of crosslinking membranes increased further. The adsorption performance of composite membranes was investigated for the removal of phenolphthalein (PP) from aqueous solution. The adsorption process followed the Langmuir isotherm model, and the kinetic behavior was accorded with the Double constant equation and the Elovich equation. The adsorption mechanism could be explained by the synergistic effect of host-guest interaction from β-cyclodextrin, non-uniform diffusion and porous network capture.
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Affiliation(s)
- Qian Tang
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.
| | - Nana Li
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Qingchen Lu
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.
| | - Xue Wang
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.
| | - Yaotian Zhu
- School of Textile Science and Engineering, Tiangong University, No. 399 Binshui Xi Road, Xiqing District, Tianjin 300387, China.
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Li D, Xi H. Layered Extraction and Adsorption Performance of Extracellular Polymeric Substances from Activated Sludge in the Enhanced Biological Phosphorus Removal Process. Molecules 2019; 24:E3358. [PMID: 31527388 PMCID: PMC6767238 DOI: 10.3390/molecules24183358] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 09/11/2019] [Accepted: 09/12/2019] [Indexed: 01/16/2023] Open
Abstract
A large amount of phosphorus was found in the extracellular polymeric substances (EPS) of activated sludge used in enhanced biological phosphorus removal (EBPR), so the role of EPS and extracellular phosphorus in EBPR should not be neglected. The composition and properties of tightly bound EPS (TB-EPS) and loosely bound EPS (LB-EPS) were significantly different, and it was necessary to study the adsorption performance of EPS through the fractionating of activated sludge into LB-EPS, TB-EPS and microbial cells. In this study, the adsorption performance of LB-EPS and TB-EPS for phosphate was explored by extracting LB-EPS and TB-EPS via sonication and cation exchange resin (CER), respectively. The results indicated that the sonication-CER method was an efficient and reliable extraction method for EPS with a synergistic effect. The performance of EPS in the adsorption/complexing of phosphate was excellent because of its abundant functional groups. Specifically, the type and content of metal elements and functional groups in TB-EPS were much greater than those in LB-EPS, which led to the key role of TB-EPS in the adsorption/complexing of phosphate. Finally, a metabolic model for EBPR with consideration of the adsorption performance of LB-EPS and TB-EPS was proposed.
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Affiliation(s)
- Daxue Li
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
- Department of Military Installations, Army Logistic University of PLA, Chongqing 401331, China.
| | - Hailing Xi
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
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20
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Guo Y, Li ZH, Yang CJ, Wang HJ, Li YM, Jiang Y. [Effects of the Physical Structure of Activated Sludge on Respiration Processes]. Huan Jing Ke Xue 2019; 40:2813-2820. [PMID: 31854675 DOI: 10.13227/j.hjkx.201812138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Physical properties and bioactivity are two important aspects of the activated sludge process. To solve the contradiction between these two aspects in the operation control process, the physical structure and respiration processes of sludge in different activated sludge systems were analyzed. Sludge from seven different activated sludge systems was used for the experiments, and the particle size, microscopic morphology, fractal dimension, compression settling performance, adsorption performance, and respirogram were studied and analyzed. The results showed that the correlations between physical performance indicators and respiration rate were very good. Sludge particle size (d) was negatively correlated with the endogenous specific respiration rate (SOURe) and maximum specific respiration rate (SOURt) (R2>0.9); fractal dimension (Df) was linearly and negatively correlated with SOURe and SOURt (R2>0.8); sludge compression index (SCI) and sludge volume index (SVI) were positively correlated with SOURe (R2>0.9); equilibrium adsorption (Qmax) was linearly and negatively correlated with the quasi-endogenous specific respiration rate (SOURq) and SOURe (R2>0.9). In addition, the optimal physical properties and bioactivity range of activated sludge under normal operating conditions were obtained as follows:SVI of 50-120 mL·g-1, SOURe of 6.27-7.55 mg·(g·h)-1, d of 205.80-228.12 μm, Df of 1.56-1.60, Rn/t of 0.02-0.03, and Qmax of 508-636 mg·g-1.
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Affiliation(s)
- Yao Guo
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Zhi-Hua Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Cheng-Jian Yang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Hui-Juan Wang
- College of Architectural and Civil Engineering, Xinjiang University, Urumqi 830047, China
| | - Ya-Ming Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yang Jiang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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21
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Zhu T, Zhang X, Han Y, Liu T, Wang B, Zhang Z. Preparation of Zeolite X by the Aluminum Residue From Coal Fly Ash for the Adsorption of Volatile Organic Compounds. Front Chem 2019; 7:341. [PMID: 31139623 PMCID: PMC6527775 DOI: 10.3389/fchem.2019.00341] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 04/25/2019] [Indexed: 11/30/2022] Open
Abstract
In China, coal fly ash is a large-scale solid waste generated by power plants. The high value utilization of coal fly ash has always been a hot research issue in China for these years. In this paper, the synthesis of zeolite X using aluminum residue from coal fly ash can not only realize the resource utilization of waste, but also achieve the effect of energy saving and emission reduction. Zeolite X prepared by hydrothermal synthesis method have been found to have higher purity and better crystallinity by chemical composition analysis. By comparing and analyzing the adsorption performance of zeolite X and activated carbon on volatile organic compounds, it is found that the adsorption capacity of zeolite X is higher than that of activated carbon, and it has stronger stability. This indicates that the zeolite X synthesized by this environmentally friendly and economical method has a good application prospect in adsorbing volatile organic compounds.
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Affiliation(s)
- Tao Zhu
- Institute of Atmospheric Environmental Management and Pollution Control, China University of Mining and Technology (Beijing), Beijing, China.,State Environmental Protection Key Laboratory of Odor Pollution Control, Tianjin, China
| | - Xing Zhang
- Institute of Atmospheric Environmental Management and Pollution Control, China University of Mining and Technology (Beijing), Beijing, China
| | - Yiwei Han
- Institute of Atmospheric Environmental Management and Pollution Control, China University of Mining and Technology (Beijing), Beijing, China
| | - Tongshen Liu
- Beijing Municipal Research Institute of Environmental Protection, Beijing, China
| | - Baodong Wang
- National Institute of Clean-and-Low-Carbon Energy, Beijing, China
| | - Zhonghua Zhang
- National Institute of Clean-and-Low-Carbon Energy, Beijing, China
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22
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Cai L, Zhang Y, Zhou Y, Zhang X, Ji L, Song W, Zhang H, Liu J. Effective Adsorption of Diesel Oil by Crab-Shell-Derived Biochar Nanomaterials. Materials (Basel) 2019; 12:E236. [PMID: 30641966 DOI: 10.3390/ma12020236] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/05/2019] [Accepted: 01/08/2019] [Indexed: 11/17/2022]
Abstract
This study, for the first time, rendered crab shell activated biochar modified by potassium hydroxide (KOH) impregnation (CSAB), revealing a new potential application in the removal of diesel oil from oily wastewater. The structural characteristics of crab shell biochar (CSB) and CSAB were investigated by SEM, and the crystal structure and optical properties of as-prepared samples were analyzed using XRD and FTIR. Results showed that CSAB had stratified surface structure morphology, abundant functional groups, and that its high specific surface area could reach up to 2441 m2/g, which was about eight times larger than that of untreated CSB (307 m2/g). An adsorption isotherm study indicated that the actual adsorption process both of CSAB and CSB were found to fit better with the Freundlich equation. Moreover, chemical interaction controlled the adsorption kinetics efficiency while the adsorption equilibrium capacity was 93.9 mg/g. Due to its highly developed pore structure, unique surface characteristics, and effective adsorption performance, this low-cost activated carbon had the potential to serve as an efficient adsorbent for water pollution purification.
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You W, Liu HC, Cao JW, Shen YL, Chen W. [Removal of Humic Acid from Water by Magnetic Chitosan-Grafted Polyacrylamide]. Huan Jing Ke Xue 2018; 39:5532-5540. [PMID: 30628397 DOI: 10.13227/j.hjkx.201803074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For high-efficiency removal of humic acid (HA), a natural organic matter in the water source, an adsorbent named magnetically modified chitosan-grafted polyacrylamide (MC-g-PAM) was developed by using an in situ coprecipitation method. Analytical instruments, such as a Fourier transform infrared (FTIR) spectroscope, scanning electron microscope (SEM), vibrating sample magnetometer (VSM), and specific surface area tester (BET), were used to characterize and analyze this material. With the aid of batch tests, the removal efficiency and mechanism of humic acid in water samples were investigated. The results show that the specific surface area and specific saturation magnetization values of the prepared MC-g-PAM are 27.065 m2·g-1 and 9.63 emu·g-1, respectively. The adsorption of humic acid by MC-g-PAM is an endothermic process and the Langmuir isotherm model and the pseudo-second-order kinetic equation fit the adsorption process well. At 25℃, the equilibrium adsorption capacity of MC-g-PAM to humic acid reaches 120.77 mg·g-1.
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Affiliation(s)
- Wen You
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Hai-Cheng Liu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
- Ministry of Education, Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, China
| | - Jia-Wei Cao
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Yao-Liang Shen
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Wei Chen
- Ministry of Education, Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, China
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Yang R, Diao Y, Abayneh B. Removal of Hg 0 from simulated flue gas over silver-loaded rice husk gasification char. R Soc Open Sci 2018; 5:180248. [PMID: 30839732 PMCID: PMC6170578 DOI: 10.1098/rsos.180248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Accepted: 07/31/2018] [Indexed: 06/09/2023]
Abstract
Mercury released into the atmosphere from coal combustion is harmful to humans and the environment. Rice husk gasification char (RHGC) is an industrial waste of biomass gasification power generation, which is silver-loaded to develop a novel and efficient sorbent for mercury removal from simulated flue gas. The experiment was carried out in a fixed-bed experimental system. The Hg0 adsorption performance of RHGC was improved significantly after loading silver. Hg0 adsorption capacity and mercury inlet concentration were found to be nonlinear. The adsorption capacity of RHGC decreased with the increase of reaction temperature. SO2 inhibited mercury removal, NO and HCl promoted mercury removal; the Hg0 adsorption capacity in the simulated flue gas was higher than that in pure N2. The silver-loaded rice husk gasification char (SRHGC) could be recycled about five times without significantly losing its removal efficiency. The SRHGC will not only reduce the cost of mercury removal but also save energy and reduce environmental pollution. At the same time, it provides a new way for the resource utilization of RHGC.
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Affiliation(s)
- Ru Yang
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
- College of Energy and Architectural engineering, Henan University of Urba Construction, Pingdingshan 467001, People's Republic of China
| | - Yongfa Diao
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Befkadu Abayneh
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
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Ren TH, Yang ZL, Guo L, Chen H, Yang Q. [Adsorption Characteristics of 2,4-D on UiO-66 from Wastewater]. Huan Jing Ke Xue 2016; 37:2202-2210. [PMID: 29964887 DOI: 10.13227/j.hjkx.2016.06.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
With UiO-66 metal organic framework as the adsorbent, the influences of factors such as time, pH value, temperature on the adsorption were studied. The results showed that the adsorption effect was best at pH=4.0 for the adsorption system and the adsorption equilibrium time was 24 h. The equilibrium adsorption capacity increased with the increasing temperature and the optimal temperature should be controlled at 30℃. The adsorption of 2,4-D on UiO-66 followed Langmuir isotherm model and the adsorption kinetics could be better described by pseudo-second-order model. The intraparticle diffusion process was the rate-controlling step for adsorption processes. The results of thermodynamic calculations showed that ΔG<0, ΔH>0, ΔS>0. So the adsorption was a spontaneous, endothermic chemical process with increased randomness. The main interaction forces of adsorption were chemical bonding force and electrostatic interactions force. Results of the study suggested that UiO-66 had the potential ability for 2,4-D removal from wastewater.
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Affiliation(s)
- Tian-Hao Ren
- Beijing Key Laboratory of Water Resource and Environmental Engineering, School of Water Resource and Environment, China University of Geosciences(Beijing), Beijing 100083, China
| | - Zhi-Lin Yang
- Beijing Key Laboratory of Water Resource and Environmental Engineering, School of Water Resource and Environment, China University of Geosciences(Beijing), Beijing 100083, China
| | - Lin Guo
- Beijing Key Laboratory of Water Resource and Environmental Engineering, School of Water Resource and Environment, China University of Geosciences(Beijing), Beijing 100083, China
| | - Hai Chen
- Beijing Key Laboratory of Water Resource and Environmental Engineering, School of Water Resource and Environment, China University of Geosciences(Beijing), Beijing 100083, China
| | - Qi Yang
- Beijing Key Laboratory of Water Resource and Environmental Engineering, School of Water Resource and Environment, China University of Geosciences(Beijing), Beijing 100083, China
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Chang SJ, Wi S, Jeong SG, Kim S. Evaluation of the Adsorption Performance and Sustainability of Exfoliated Graphite Nanoplatelets (xGnP) for VOCs. Materials (Basel) 2015; 8:7615-7621. [PMID: 28793664 PMCID: PMC5458910 DOI: 10.3390/ma8115412] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 11/04/2015] [Accepted: 11/04/2015] [Indexed: 11/21/2022]
Abstract
Exfoliated graphite nanoplatelets (xGnP), which combine the layered structure and low price of nanoclays with the superior mechanical, electrical, and thermal properties of carbon nanotubes, are very cost-effective, and can simultaneously provide a multitude of physical and chemical property enhancements. In this study, we evaluated xGnP’s adsorption performance of volatile organic compounds (VOCs) according to thermal extractor (TE) analysis for seven days in order to use the xGnP as an adsorption material of pollutants. In addition, we carried out a sustainability evaluation in order to evaluate its adsorption capacity over 28 days. The results indicate that the adsorption performance of xGnP is higher than for other adsorption materials such as zeolite. Also, we determined that the adsorption performance of xGnP is maintained continuously for 28 days and that its adsorption capacity is large.
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Affiliation(s)
- Seong Jin Chang
- School of Architecture, Soongsil University, Seoul 156-743, Korea.
| | - Seunghwan Wi
- School of Architecture, Soongsil University, Seoul 156-743, Korea.
| | - Su-Gwang Jeong
- School of Architecture, Soongsil University, Seoul 156-743, Korea.
| | - Sumin Kim
- School of Architecture, Soongsil University, Seoul 156-743, Korea.
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