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Wei J, Duan Y, Li M, Lin H, Lv J, Chen Z, Lin J, Song H, Zhang R, Li L, Huang L. A novel manganese sulfide encapsulating biochar-dispersed zero-valent iron composite for high removal ability of Cr(VI) in water and its mechanism. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Bukhari A, Ijaz I, Zain H, Mehmood U, Mudassir Iqbal M, Gilani E, Nazir A. Introduction of CdO Nanoparticles into Graphene and Graphene Oxide Nanosheets for increasing Adsorption Capacity of Cr from Wastewater Collected from Petroleum Refinery. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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3
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Li M, Kuang S, Dong J, Ma H, Kang Y. Performance and mechanisms of Cr(VI) removal by nano-MnO2 with different lattices. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Chen D, Jin Z, Xing H. Titanium-Porphyrin Metal-Organic Frameworks as Visible-Light-Driven Catalysts for Highly Efficient Sonophotocatalytic Reduction of Cr(VI). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:12292-12299. [PMID: 36179378 DOI: 10.1021/acs.langmuir.2c01932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In this work, we synthesized and characterized four titanium-porphyrin metal-organic frameworks (MOFs) [DGIST-1(M), M = Co(II), Fe(III), Zn(II), and H2] and used them as visible-light-driven catalysts for sonophotocatalytic Cr(VI) reduction. DGIST-1(M) exhibited open-framework, broad light absorption stemmed from ligand and sensitive photocurrent responses owing to the integration of one-dimensional Ti-oxo chains and 4-connected conjugated TCPP ligand (TCPP = tetrakis(4-carboxyphenyl)-porphyrin). DGIST-1(M) presented efficient reduction of Cr(VI) to Cr(III) in aqueous solution when used as sonophotocatalytic catalysts. The average reduction rates upon Cr(VI) were 0.920, 0.476, 0.377, and 0.194 mg·L-1·min-1 for DGIST-1(H2), DGIST-1(Zn), DGIST-1(Co), and DGIST-1(Fe), which are 1.15-2.45 times higher than those in photocatalysis. Sonophotocatalytic experiments and electron paramagnetic resonance measurement proved that Ti-oxo chain units and porphyrin ligand in the structures of DGIST-1(M) existed as catalytic active centers for sonophotocatalytic reduction of Cr(VI). Photoluminescence and UV absorption spectra revealed that the unity of photocatalysis and sonochemistry strengthened the migration of photogenerated electrons from DGIST-1(M) to Cr(VI), which improved the activities of catalysts. This study suggested that the association of titanium-porphyrin MOFs and sonophotocatalytic technology is an impactful program for enhancing MOF-based photocatalytic systems.
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Affiliation(s)
- Dashu Chen
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, No. 26 Hexing Road, Harbin150040, China
| | - Zhi Jin
- College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, No. 26 Hexing Road, Harbin150040, China
| | - Hongzhu Xing
- College of Chemistry, Northeast Normal University, No. 5268 Renmin Street, Changchun130024, China
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Zhang S, Zheng K, Xu G, Liang B, Yin Q. Enhanced removal of tetracycline via advanced oxidation of sodium persulfate and biochar adsorption. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:72556-72567. [PMID: 35608769 DOI: 10.1007/s11356-022-20817-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 05/10/2022] [Indexed: 06/15/2023]
Abstract
Advanced oxidation of antibiotic tetracycline (TC) is becoming an accessible and efficient technology. The removal of TC from the complex wastewater needs to be lucubrated. In this study, a TC removal system involving degradation and adsorption was established. TC degradation was accomplished by enhanced advanced oxidation via the addition of sodium persulfate (SP) and biochar into simulated wastewater containing Mn2+ and TC wastewater. The adsorption of TC and its derivatives was removed by biochar. The results indicate that the optimized reaction parameters were 3.0 g/L of biochar prepared at 600 °C (B600) and 400 mg/L of SP under acidic condition, and the removal percentage of TC was 87.48%, including 74.23% of degradation and 13.28% of adsorption; the anions Cl-, NO3-, and H2PO4- had negligible effects on the removal of TC in this Mn2+/B600/SP system. The system also functioned well with an aqueous solution with a high chemical oxygen demand (COD) concentration. Electron paramagnetic resonance (EPR) analysis indicated that ·OH and SO4- free radicals were present in the Mn2+/B600/SP system. Based on the testing and analysis results, a removal mechanism and potential TC degradation pathway for this system were proposed. TC can be degraded by ·OH and SO4- via three degradation pathways. Mn2+ can be precipitated as MnO2, and a part of the TC and its derivatives can be adsorbed on the biochar surface. The Mn2+/B600/SP system also performed satisfactorily for a complex aqueous solution with various cations and antibiotics.
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Affiliation(s)
- Shiqiu Zhang
- Institute for Carbon Neutrality, Shandong Normal University, Jinan, 250014, Shandong, China
- College of Geography and Environment, Shandong Normal University, Jinan, 250014, Shandong, China
- National & Local Joint Engineering Research Center of Biomass Resource Utilization, Nankai University, Jinnan District, Tianjin, 300350, China
| | - Kui Zheng
- Analytical and Testing Center, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China
| | - Geng Xu
- Institute for Carbon Neutrality, Shandong Normal University, Jinan, 250014, Shandong, China
- College of Geography and Environment, Shandong Normal University, Jinan, 250014, Shandong, China
| | - Bolong Liang
- School of Eco-Environment, Hebei University, Baoding, 071002, Hebei, China
| | - Qin Yin
- State Key Laboratory of Environmental Criteria and Risk Assessment, Pollution Control Research Center, Chinese Research Academy of Environmental Science, Beijing, 100012, China.
- College of Water Science, Beijing Normal University, Beijing, 100875, China.
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Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal. MINERALS 2022. [DOI: 10.3390/min12020182] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, Cu2(OH)3NO3. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.
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Singh S, Anil AG, Khasnabis S, Kumar V, Nath B, Adiga V, Kumar Naik TSS, Subramanian S, Kumar V, Singh J, Ramamurthy PC. Sustainable removal of Cr(VI) using graphene oxide-zinc oxide nanohybrid: Adsorption kinetics, isotherms and thermodynamics. ENVIRONMENTAL RESEARCH 2022; 203:111891. [PMID: 34419468 DOI: 10.1016/j.envres.2021.111891] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/05/2021] [Accepted: 08/12/2021] [Indexed: 05/19/2023]
Abstract
Metal-based adsorbents are limited for hexavalent chromium [Cr(VI)] adsorption from aqueous solutions because of their low adsorption capacities and slow adsorption kinetics. In the present study, decorated zinc oxide (ZnO) nanoparticles (NPs) on graphene oxide (GO) nanoparticles were synthesized via the solvothermal process. The deposition of ZnO NPs on graphene oxide for the nanohybrid (ZnO-GO) improves Cr(VI) mobility in the nanocomposite or nanohybrid, thereby improving the Cr(VI) adsorption kinetics and removal capacity. Surface deposition of ZnO on graphene oxide was characterized through Fourie Transform Infra-red (FTIR), UV-Visible, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques. These characterizations suggest the formation of ZnO-GO nanocomposite with a specific area of 32.95 m2/g and pore volume of 0.058 cm2/g. Batch adsorption analysis was carried to evaluate the influence of operational parameters, equilibrium isotherm, adsorption kinetics and thermodynamics. The removal efficiency of Cr(VI) increases with increasing time and adsorbent dosage. FTIR, FESEM and BET analysis before and after the adsorption studies suggest the obvious changes in the surface functionalization and morphology of the ZnO-GO nanocomposites. The removal efficiency increases from high-acidic to neutral pH and continues to decrease under alkaline conditions as well. Mathematical modeling validates that the adsorption follows Langmuir isotherm and fits well with the pseudo 2nd order kinetics (Type 5) model, indicating a homogeneous adsorption process. The thermodynamics study reveals that Cr(VI) adsorption on ZnO-GO is spontaneous, endothermic, and entropy-driven. A negative value of Gibb's Free Energy represents the thermodynamic spontaneity and feasibility of the sorption process. To the best of our knowledge, this is the first study of Cr(VI) removal from aqueous solution using this hybrid nanocomposite at near-neutral pH. The synthesized nanocomposites prove to be excellent candidates for Cr(VI) removal from water bodies and natural wastewater systems.
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Affiliation(s)
- Simranjeet Singh
- Interdisciplinary Centre for Water Research (ICWaR), Indian Institute of Science, Bangalore, 56001, India
| | - Amith G Anil
- Department of Materials Engineering, Indian Institute of Science, Bangalore, 56001, India
| | - Sutripto Khasnabis
- Department of Materials Engineering, Indian Institute of Science, Bangalore, 56001, India
| | - Vijay Kumar
- Department of Chemistry, Central Ayurveda Research Institute, Jhansi, U.P, India
| | - Bidisha Nath
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore, 56001, India
| | - Varun Adiga
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore, 56001, India
| | - T S Sunil Kumar Naik
- Department of Materials Engineering, Indian Institute of Science, Bangalore, 56001, India
| | - S Subramanian
- Department of Materials Engineering, Indian Institute of Science, Bangalore, 56001, India
| | - Vineet Kumar
- Department of Botany, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh, 495009, India
| | - Joginder Singh
- Department of Microbiology, Lovely Professional University, Jalandhar, Punjab, 144111, India.
| | - Praveen C Ramamurthy
- Interdisciplinary Centre for Water Research (ICWaR), Indian Institute of Science, Bangalore, 56001, India.
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Thangagiri B, Sakthivel A, Jeyasubramanian K, Seenivasan S, Dhaveethu Raja J, Yun K. Removal of hexavalent chromium by biochar derived from Azadirachta indica leaves: Batch and column studies. CHEMOSPHERE 2022; 286:131598. [PMID: 34325269 DOI: 10.1016/j.chemosphere.2021.131598] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/29/2021] [Accepted: 07/16/2021] [Indexed: 06/13/2023]
Abstract
This report details the preparation, characterization, and applications of an inexpensive adsorbent obtained from Azadirachta indica leaves (Neem biochar (NBC)) and used to remove Cr(VI) from the synthetic waste water. The obtained NBC was characterized by XRD, FTIR, FESEM, EDX and Zeta potential measurements. Adsorption experiments conducted at various pH levels confirmed that 58.54 mg g-1 of Cr(VI) was removed by NBC at pH 2. Experiments conducted at various temperatures revealed that the Cr(VI) adsorption on NBC fits the Langmuir-type adsorption isotherm. A fixed-bed column study was conducted to obtain breakthrough curve for the adsorption process, which confirmed that the NBC usage rate was 4.63 g/L. Cr(VI)NBC was reactivated by NaOH treatment, and the reactivated NBC was used as a sorbent to remove fresh Cr(VI) from the synthetic waste water repeatedly. A cost analysis was also performed for the Cr(VI) removal confirmed that the process was less expensive.
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Affiliation(s)
- B Thangagiri
- Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi, 626005, Tamil Nadu, India
| | - A Sakthivel
- Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi, 626005, Tamil Nadu, India.
| | - K Jeyasubramanian
- Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi, 626005, Tamil Nadu, India
| | - S Seenivasan
- Department of Environmental Toxicology, Texas Tech University, Lubbock, TX, 79409-1163, USA
| | - J Dhaveethu Raja
- Department of Chemistry, The American College, Madurai, 625 005, India
| | - Kyusik Yun
- Department of BioNano Technology, Gachon University, Seongnam, 13120, Republic of Korea.
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Jiang Y, Yang F, Dai M, Ali I, Shen X, Hou X, Alhewairini SS, Peng C, Naz I. Application of microbial immobilization technology for remediation of Cr(VI) contamination: A review. CHEMOSPHERE 2022; 286:131721. [PMID: 34352550 DOI: 10.1016/j.chemosphere.2021.131721] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 07/26/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
The discharge of chromium (Cr) contaminated wastewater is creating a serious threat to aquatic environment due to the rapid pace in agricultural and industrial activities. Particularly, the long-term exposure of Cr(VI) polluted wastewater to the environment is causing serious harm to human health. Therefore, the treatment of Cr(VI) contaminated wastewater is demanding widespread attention. Regarding this, the bioremediation is being considered as a reliable and feasible option to handle Cr(VI) contaminated wastewater because of having low technical investment and operating costs. However, certain factors such as loss of microorganisms, toxicity to microorganisms and uneven microbial growth cycle in the presence of high concentrations of Cr(VI) are hindering its commercial applications. Regarding this, microbial immobilization technology (MIT) is getting great research interest because it could overcome the shortcomings of bioremediation technology's poor tolerance against Cr. Therefore, this review is the first attempt to emphases recent research developments in the remediation of Cr(VI) contamination via MIT. Starting from the selection of immobilized carrier, the present review is designed to critically discuss the various microbial immobilizing methods i.e., adsorption, embedding, covalent binding and medium interception. Further, the mechanism of Cr(VI) removal by immobilized microorganism has also been explored, precisely. In addition, three kinds of microorganism immobilization devices have been critically examined. Finally, knowledge gaps/key challenges and future perspectives are also discussed that would be helpful for the experts in improving MIT for the remediation of Cr(VI) contamination.
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Affiliation(s)
- Yating Jiang
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing, 526061, China; The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao,266100, China
| | - Fei Yang
- The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao,266100, China
| | - Min Dai
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing, 526061, China
| | - Imran Ali
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Xing Shen
- The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao,266100, China
| | - Xiaoting Hou
- The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao,266100, China; Sunwater Environmental Science & Technology Co. Ltd., Rizhao, 262300, China
| | - Saleh S Alhewairini
- Department of Plant Production and Protection, College of Agriculture and Veterinary Medicine, Qassim University, Buraidah 51452, Qassim, Saudi Arabia
| | - Changsheng Peng
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing, 526061, China; The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao,266100, China.
| | - Iffat Naz
- Department of Biology, Deanship of Educational Services, Qassim University, Buraidah, 51452, Saudi Arabia.
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Efficient removal of Cr(VI) from aqueous solution by natural pyrite/rhodochrosite derived materials: Performance, kinetic and mechanism. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.08.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yu J, Wu Z, An X, Tian F, Yu B. Trace metal elements mediated co-pyrolysis of biomass and bentonite for the synthesis of biochar with high stability. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 774:145611. [PMID: 33607429 DOI: 10.1016/j.scitotenv.2021.145611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 01/11/2021] [Accepted: 01/30/2021] [Indexed: 06/12/2023]
Abstract
The stability of biochar is a crucial parameter in determining the potential of biochar for carbon sequestration. Many studies have demonstrated that the addition of clay during the pyrolysis of biomass is beneficial for the production of biochar with a high stability, but finding a strategy for a further improvement of stability of clay-modified biochar is still highly desirable. Herein, the co-pyrolysis of biomass and clay mediated by trace metal elements is proposed as a new strategy for the production of biochar with exceptionally high stability. The results indicate that the biochar resistance index for biochar obtained from the trace metal elements mediated the co-pyrolysis of biomass and clay is ~0.75, which is much higher than that of biochars obtained from biomass pyrolysis or the co-pyrolysis of biomass and clay, demonstrating that the presence of metal ions during the co-pyrolytic process can significantly improve the oxidation resistance of biochar. Thermogravimetric analysis reveals that the carbon retention value is reduced when the addition of metal ions during the co-pyrolytic process, and the presence of metal ions can reduce the starting temperature of the pyrolysis reaction and catalyze the process of biomass pyrolysis. In addition, the percentages of CC, CC, and CH in all biochars obtained from trace metal elements mediated the co-pyrolysis of biomass and clay are greater than 41.82%, which are higher than that of original biochar. Besides, the percentage of oxygen-containing functional groups is found to be decreased after the presence of metal ions during the co-pyrolytic process. The presence of metal ions can form metal nano-sulfides and oxides on the surface, which plays a physical barrier to the anti-oxidation performance of biochar. Furthermore, compared to BBC or BC, MnBBC and ZnBBC have a better leaching resistance to P, while FeBBC has almost no leaching resistance to soil P. Overall, the study reveals that the addition of trace element metal ions during the co-prolysis of biomass and bentonite is an effective method to increase the stability of obtained biochar, and it is also beneficial for retarding the release of nutrients in the soil and thus increase the utilization of nutrients.
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Affiliation(s)
- Junzhi Yu
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, PR China
| | - Zhansheng Wu
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, PR China; Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710000, PR China.
| | - Xiongfang An
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, PR China; School of Environment and Resources, Zhejiang Agriculture and Forestry University, Hangzhou 311300, PR China
| | - Fei Tian
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710000, PR China
| | - Bing Yu
- School of Environment and Resources, Zhejiang Agriculture and Forestry University, Hangzhou 311300, PR China.
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Zheng C, Yang Z, Si M, Zhu F, Yang W, Zhao F, Shi Y. Application of biochars in the remediation of chromium contamination: Fabrication, mechanisms, and interfering species. JOURNAL OF HAZARDOUS MATERIALS 2021; 407:124376. [PMID: 33144008 DOI: 10.1016/j.jhazmat.2020.124376] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 10/21/2020] [Accepted: 10/22/2020] [Indexed: 05/22/2023]
Abstract
Chromium (Cr) is one of the most toxic pollutants that has accumulated in terrestrial and aqueous systems, posing serious risks towards living beings on a worldwide scale. The immobilization, removal, and detoxification of active Cr from natural environment can be accomplished using multiple advanced materials. Biochar, a carbonaceous pyrolytic product made from biomass waste, is considered as a promising material for the elimination of Cr contamination. The preparation and properties of biochar as well as its remediation process for Cr ions have been well investigated. However, the distinct correlation of the manufacturing, characteristics, and mechanisms involved in the remediation of Cr contamination by various designed biochars is not summarized. Herein, this review provides information about the production, modification, and characteristics of biochars along with their corresponding effects on Cr stabilization. Biochar could be modified via physical, hybrid, chemical, and biological methods. The remediating mechanisms of Cr contamination using biochars involve adsorption, reduction, electron shuttle, and photocatalysis. Moreover, the coexisting ions and organic pollutants change the pattern of the remediating process of biochar in actual Cr contaminated water and soil. Finally, the present limitations and future perspectives are proposed.
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Affiliation(s)
- Chujing Zheng
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Zhihui Yang
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Mengying Si
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Feng Zhu
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Weichun Yang
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Feiping Zhao
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China; School of Engineering Science, LUT University, Sammonkatu 12, FI-50130, Mikkeli, Finland
| | - Yan Shi
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
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Yan Z, Wu T, Fang G, Ran M, Shen K, Liao G. Self-assembly preparation of lignin-graphene oxide composite nanospheres for highly efficient Cr(vi) removal. RSC Adv 2021; 11:4713-4722. [PMID: 35424380 PMCID: PMC8694538 DOI: 10.1039/d0ra09190a] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/19/2021] [Indexed: 01/08/2023] Open
Abstract
Recently, research interest in the application of lignin is growing, especially as adsorbent material. However, single lignin shows unsatisfactory adsorption performance, and thus, construction of lignin-based nanocomposites is worth considering. Herein, we introduced graphene oxide (GO) into lignin to form lignin/GO (LGNs) composite nanospheres by a self-assembly method. FTIR and 1H NMR spectroscopy illustrated that lignin and GO are tightly connected by hydrogen bonds. The LGNs as an environmental friendly material, also exhibit excellent performance for Cr(vi) removal. The maximum sorption capacity of LGNs is 368.78 mg g-1, and the sorption efficiency is 1.5 times than that of lignin nanospheres (LNs). The removal process of Cr(vi) via LGNs mainly relies on electrostatic interaction, and it also involves the reduction of Cr(vi) to Cr(iii). Moreover, LGNs still have high adsorption performance after repeating five times with the sorption capacity of 150.4 mg g-1 in 200 mg g-1 Cr(vi) solution. Therefore, the prepared lignin-GO composite nanospheres have enormous potential as a low-cost, high-absorbent and recyclable adsorbent, and can be used in wastewater treatment.
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Affiliation(s)
- Zhenyu Yan
- Institute of Chemical Industry of Forest Products, CAF, Jiangsu Key Lab. of Biomass Energy and Material Nanjing 210042 Jiangsu China
- College of Light Industry and Food Engineering, Nanjing Forestry University Nanjing 210042 Jiangsu China
| | - Ting Wu
- Institute of Chemical Industry of Forest Products, CAF, Jiangsu Key Lab. of Biomass Energy and Material Nanjing 210042 Jiangsu China
| | - Guigan Fang
- Institute of Chemical Industry of Forest Products, CAF, Jiangsu Key Lab. of Biomass Energy and Material Nanjing 210042 Jiangsu China
- College of Light Industry and Food Engineering, Nanjing Forestry University Nanjing 210042 Jiangsu China
| | - Miao Ran
- Institute of Chemical Industry of Forest Products, CAF, Jiangsu Key Lab. of Biomass Energy and Material Nanjing 210042 Jiangsu China
| | - Kuizhong Shen
- Institute of Chemical Industry of Forest Products, CAF, Jiangsu Key Lab. of Biomass Energy and Material Nanjing 210042 Jiangsu China
| | - Guangfu Liao
- Electrochemical Energy and Interfaces Laboratory, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong Shatin, N.T. Hong Kong SAR China
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Yang C, Ju T, Wang X, Ji Y, Yang C, Lv H, Wang Y, Dong W, Dang F, Shi X, Wang W, Fan Y. The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions. RSC Adv 2020; 10:10612-10623. [PMID: 35492911 PMCID: PMC9050376 DOI: 10.1039/c9ra10558a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/24/2020] [Indexed: 01/08/2023] Open
Abstract
To remove hexavalent chromium Cr(vi) efficiently, a novel Fe–Mn binary oxide adsorbent was prepared via a “two-step method” combined with a co-precipitation method and hydrothermal method. The as-prepared Fe–Mn binary oxide absorbent was characterized via transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectra (FTIR), thermogravimetric analysis (TGA), zeta potential, BET and X-ray photoelectron spectroscopy (XPS). The results indicated that the morphology of the adsorbent was rod-like with length of about 100 nm and width of about 50–60 nm, specific surface area was 63.297 m2 g−1, has the composition of α-Fe2O3, β-MnO2 and MnFe2O4 and isoelectric point was observed at pH value of 4.81. The removal of Cr(vi) was chosen as a model reaction to evaluate the adsorption capacity of the Fe–Mn binary oxide adsorbent, indicating that the Fe–Mn binary oxide adsorbent showed high adsorption performance (removal rate = 99%) and excellent adsorption stability (removal rate > 90% after six rounds of adsorption). The adsorption behavior of the Fe–Mn binary oxide was better represented by the Freundlich model (adsorption isotherm) and the pseudo-second-order model (adsorption kinetic), suggesting that the adsorption process was multi-molecular layer chemical adsorption. The possible adsorption mechanism of the Fe–Mn binary oxide for the removal of Cr(vi) included the protonation process and the electrostatic attraction interactions. A novel Fe–Mn binary oxide adsorbent prepared via “co-precipitation and hydrothermal” method, for the efficient and fast removal of Cr(vi).![]()
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