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Chen D, Song Y, Li H, Ma M, Nan F, Huang P, Zhan W. Remarkable adsorption of As(V) by Fe 3+ and Mg 2+ modified alginate porous beads (Fe/Mg-SA) via a facile method. Int J Biol Macromol 2024; 254:127994. [PMID: 37952800 DOI: 10.1016/j.ijbiomac.2023.127994] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/23/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
Although sodium alginate (SA) is frequently utilized because of its good gelling properties, the substance's dearth of adsorption active sites prevents it from effectively removing heavy metals. Herein, SA was used as the base material to form a cross-linked structure with Fe3+ and Mg2+, and gel beads with a diameter of 2.0 ± 0.1 mm with specific adsorption on As(V) were synthesized as adsorbent (Fe/Mg-SA). Fe/Mg-SA was systematically characterized, and its adsorption properties were investigated by varying several conditions. Fe/Mg-SA had a wide pH application range. The adsorption kinetics revealed that a quasi-secondary kinetic model was followed. The adsorption process is linked to the complexation of hydroxyl and AsO43-, chemisorption predominated the adsorption process. The maximal adsorption capacity of Fe/Mg-SA is determined by fitting the Langmuir model to be 37.4 mg/g. Compared to other adsorbents, it is simpler to synthesis, more effective and cheaper. Each treatment of 1 m3 wastewater of Fe/Mg-SA only costs ¥ 38.612. The novel gel beads synthesized provides a better option for purifying groundwater contaminated with As(V).
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Affiliation(s)
- Donghui Chen
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Yanqing Song
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Hong Li
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Mengyu Ma
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Fangming Nan
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Ping Huang
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China
| | - Wei Zhan
- Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, PR China; Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, Wuhan 430074, PR China.
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2
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Wei W, Chen F, Qiu Y, Zhang L, Gao J, Wu T, Wang P, Zhang M, Zhu Q. Co-encapsulation of collagen peptide and astaxanthin in W G/O G/W double emulsions-filled alginate hydro gel beads: Fabrication, characterization and digestion behaviors. J Colloid Interface Sci 2023; 651:159-171. [PMID: 37542891 DOI: 10.1016/j.jcis.2023.07.201] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 06/18/2023] [Accepted: 07/30/2023] [Indexed: 08/07/2023]
Abstract
The double emulsions-filled hydrogel beads delivery systems with controlled lipolysis and sustained-release property of co-encapsulated bioactive substances will be highly desired. Herein, the water-in-oil-in-water emulsion with gelled inner water phase and oil phase (WG/OG/W) filled hydrogel beads as a novel co-delivery system were developed with varied concentrations of rice bran wax and W/O emulsions to achieve effectively controlled release of lipolysis and nutraceuticals. Interestingly, the gelation of oil phase triggered by rice bran wax could enhance the storage stability of WG/OG/W emulsions due to the enhanced viscoelastic property. Increasing the mass fractions of W/O emulsions improved the stability of double emulsions due to increased viscosity and decreased particle size. Cryo-SEM observation showed that the double emulsion droplets were scattered in the three-dimensional network of alginate gel beads. Increased the addition of rice bran wax or W/O emulsions, the encapsulation efficiency of collagen peptide and astaxanthin was significantly improved. The in vitro digestion results indicated that increasing the concentrations of rice bran wax and W/O emulsion fractions in WG/OG/W emulsion-filled gel beads could effectively delay the release extent of free fatty acids and encapsulated nutraceuticals. The presence of rice bran wax contributed to increase the bioaccessibility of collagen peptide and astaxanthin.
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Affiliation(s)
- Wei Wei
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Fu Chen
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Yihua Qiu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Lujia Zhang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Jianbiao Gao
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Tao Wu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Ping Wang
- Tianjin Modern Innovative TCM Technology Co., Ltd., Tianjin 300000, PR China
| | - Min Zhang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China; Tianjin Agricultural University, Tianjin 300384, PR China
| | - Qiaomei Zhu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China; Tianjin Modern Innovative TCM Technology Co., Ltd., Tianjin 300000, PR China.
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Li S, Liu P, Wang Y, Yang Q, Ma Y. Constructing defective-functionalized g-C 3N 4 homojunction for efficient photocatalytic detoxification of lemon yellow in an aqueous solution and beverage. Food Chem 2023; 422:136263. [PMID: 37141755 DOI: 10.1016/j.foodchem.2023.136263] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 04/16/2023] [Accepted: 04/25/2023] [Indexed: 05/06/2023]
Abstract
The content of food colorant in food and environment should be limited to a safe range. Thus, cost-effective, and environmental-friendly detoxification technology is urgent for food safety and environmental protection. In this work, defective-functionalized g-C3N4 was successfully fabricated via intermediate engineering strategy. The prepared g-C3N4 possesses large specific surface area with abundant in-plane pores. Carbon vacancy and N-CO unit are introduced into g-C3N4 molecular framework, endowing the different degrees of n-type conductivity in varied domains. And then the n-n homojunction is generated. This homojunction structure is demonstrated to be efficient in separation and transfer of photoinduced charge carriers, and causes enhanced photocatalytic detoxification of lemon yellow under visible light. Furthermore, as-prepared g-C3N4 in lemon tea enable completely removed lemon yellow without obvious effect on its overall acceptability. The findings deepen the understanding on the defect-induced self-functionality of g-C3N4, and prove the application potential of photocatalytic technology in contaminated beverages.
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Affiliation(s)
- Shisen Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Ping Liu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, PR China.
| | - Yinghui Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Qingli Yang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Yongchao Ma
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China.
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4
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Wang J, Liang J, Sun L, Shen J, He Z. Enhancing anammox resistance to low operating temperatures with the use of PVA gel beads. Sci Total Environ 2021; 774:144826. [PMID: 33610986 DOI: 10.1016/j.scitotenv.2020.144826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/02/2020] [Revised: 12/24/2020] [Accepted: 12/24/2020] [Indexed: 06/12/2023]
Abstract
Low temperatures, or a sudden decrease in operating temperature, can seriously inhibit anammox activity, it is, therefore, important to maintain anammox activities at a low temperature. In this study, the use of gel beads to enhance the resistance of anammox biomass to a low temperature was investigated. The performance of three reactors: R1 without gel beads; R2 with polyvinyl alcohol/chitosan (PVA/CS); R3 with PVA/CS/Fe, was studied and compared in a temperature transition from 35 to 8 °C. When the operating temperature was ≥25 °C, there was little difference in nitrogen removal among the three reactors. Decreasing the temperature to < 25 °C created obvious difference between R1 and R2/R3. R1 had a nitrogen removal efficiency (NRE) of 33.1 ± 25.3% at 10 °C, significantly lower than that of R2 (90.5 ± 2.5%) or R3 (87.7 ± 11.1%). Unclassified Candidatus Brocadiaceae was the dominant genus at 10 °C, with an abundance of 44.4, 56.5 and 58.7% in R1, R2 and R3, respectively. These differences were attributed to the use of gel beads, which promoted the granulation of both the non-immobilized sludge and the immobilized biomass, resulting in higher anammox activities in R2/R3. The non-immobilized sludge of R1 was dominated by small particles (<300 μm) at 10 °C, while in R2 and R3 large particles (1000-2000 μm) were the main components. Furthermore, the immobilized biomass on gel beads exhibited much higher anammox activity and maintained a relatively high level of nitrate reductase and nitrite reductase in response to the temperature decrease. The Fe2+/Fe3+ in the PVA/CS/Fe gel beads further promoted microbial aggregation and led to an improved performance in R3 compared to R2. The results of this study demonstrate an effective approach to increase anammox resistance at low operating temperatures.
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Affiliation(s)
- Jinxing Wang
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an, Shanxi 710049, China; Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Jidong Liang
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an, Shanxi 710049, China.
| | - Li Sun
- China Qiyuan Engineering Corporation, China
| | - Jianqing Shen
- Tong Xiang Small Boss Special Plastic Products Co. Ltd, China
| | - Zhen He
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.
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5
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Zafeiri I, Beri A, Linter B, Norton I. Mechanical properties of starch-filled alginate gel particles. Carbohydr Polym 2021; 255:117373. [PMID: 33436205 DOI: 10.1016/j.carbpol.2020.117373] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 10/30/2020] [Accepted: 10/30/2020] [Indexed: 11/25/2022]
Abstract
The aim of this work was to investigate the mechanical behaviour of alginate-based composite particles. Alginate gel beads with entrapped starch were used as the replicates of storage cells of plant tissue. Beads were formulated using different ratios of both ingredients and were produced using two methods, resulting in particles in the macro- and micro-scale size range. Compression tests revealed an effect of bead size on mechanical properties and a dominant role of the alginate on the material properties. Starch was successfully encapsulated as native granules in the beads and once encompassed, it suffered restricted swelling, up to 45 % of its original size, after undergoing heating. Force versus displacement data were fitted to both an empirical and the Hertz model and Young's modulus was found to increase only with heated starch inclusions. Microscopy was deemed crucial for the interpretation of mechanical measurements.
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Affiliation(s)
- Ioanna Zafeiri
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
| | - Akash Beri
- PepsiCo International Ltd, 4 Leycroft Rd, Leicester, LE4 1ET, UK
| | - Bruce Linter
- PepsiCo International Ltd, 4 Leycroft Rd, Leicester, LE4 1ET, UK
| | - Ian Norton
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Wu B, Wang Z, Peng D, Wang Y, He T, Tang H, Xu H. Removal and recovery of heavy metals from soil with sodium alginate coated FeSSi nanocomposites in a leaching process. J Hazard Mater 2020; 398:122732. [PMID: 32497855 DOI: 10.1016/j.jhazmat.2020.122732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/03/2020] [Accepted: 04/12/2020] [Indexed: 06/11/2023]
Abstract
Leaching technology has been widely applied to remove heavy metals (HMs) from soil, although the synchronous recovery of multiple HMs during the leaching process was rarely studied. In this study, we synthesized silicon sulfuretted nanoscale zero-valent iron (FeSSi), which was coated with sodium alginate (SA) to form the gel beads (SA-FeSSi). The specific surface area of FeSSi (101.61 m2/g) was significantly increased by adding SiO2 seeding. The SA stabilization reduced the aggregation of FeSSi. The removal efficiency for cadmium (Cd), lead (Pb), nickle (Ni) and chromium (Cr) by SA-FeSSi in solution reached 80.10 %, 99.96 %, 66.80 % and 80.46 %, respectively. The removal kinetics was well fitted with the pseudo-second-order model. Leaching experiments showed that the recovery efficiency of HMs from solution (Rr/w) and soil (Rr/s) reached to the ranges of 59.79 %-98.70 % and 25.94 %-62.67 % with the addition of 0.3 g SA-FeSSi. Moreover, the leaching conditions including pH, temperature, adsorbent dosage, leaching agent concentrations, leaching time and leaching cycles were also investigated. Our results suggested that SA-FeSSi had an excellent HMs removal capacity and the recovery of HMs during the leaching process by SA-FeSSi could be a potential pathway to reuse the metal resources from soil.
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Affiliation(s)
- Bin Wu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Ziru Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Dinghua Peng
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Ying Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Tingting He
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Hao Tang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Heng Xu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China.
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Qiao K, Tian W, Bai J, Wang L, Zhao J, Song T, Chu M. Removal of high-molecular-weight polycyclic aromatic hydrocarbons by a microbial consortium immobilized in magnetic floating biochar gel beads. Mar Pollut Bull 2020; 159:111489. [PMID: 32892922 DOI: 10.1016/j.marpolbul.2020.111489] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 04/01/2020] [Revised: 07/15/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
A bacterial consortium immobilized in magnetic floating biochar gel beads is proposed to remove high-molecular-weight polycyclic aromatic hydrocarbons. The microbial consortium performed better than single strains and consisted of four strains of marine bacteria for degrading pyrene (PYR), two strains for benzo(a)pyrene (BAP), and three strains for indeno(1,2,3-cd)pyrene (INP), which were isolated from oil-contaminated seawater. The immobilized cells could biodegrade 89.8%, 66.9% and 78.2% of PYR, BAP and INP, respectively, and had better tolerance to pH, temperature and salinity than free cells. The Andrews model was used to explore the biodegradation kinetics, and when the initial concentrations of PYR, BAP, and INP were 7.80, 3.05, and 3.41 mg/L, the specific biodegradation rates reached maximum values of 0.2507, 0.1286, and 0.1930 d-1, respectively. The immobilized microbial consortium had a high HMW-PAH removal ability and good floatability and magnetic properties and could be collected by an external magnetic field.
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Affiliation(s)
- Kaili Qiao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Weijun Tian
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China.
| | - Jie Bai
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China
| | - Liang Wang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Jing Zhao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Tiantian Song
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Meile Chu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
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Qin L, Zhao Y, Wang L, Zhang L, Kang S, Wang W, Zhang T, Song S. Preparation of ion-imprinted montmorillonite nanosheets/chitosan gel beads for selective recovery of Cu(Ⅱ) from wastewater. Chemosphere 2020; 252:126560. [PMID: 32222519 DOI: 10.1016/j.chemosphere.2020.126560] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [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: 01/18/2020] [Revised: 03/14/2020] [Accepted: 03/18/2020] [Indexed: 06/10/2023]
Abstract
The novel ion-imprinted montmorillonite nanosheets/chitosan (IIMNC) gel beads were prepared for selective adsorption of Cu2+. The IIMNC gel beads were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The results showed that IIMNC was successfully assembled and rich in honeycombed pores, which performed well in the removal of Cu2+ through the synergistic effect of montmorillonite nanosheets and chitosan. The elimination of copper was followed by pseudo-second-order model and was enhanced by introduced montmorillonite nanosheets (MMTNS) because MMTNS attracted Cu(Ⅱ) by its negative charge and provided active adsorption sites through its high performance of cation exchange. This composite gel also showed excellent reusability, performing well in the removal of Cu2+ after undergoing adsorption-desorption in five cycles, because the adsorption sites of MMTNS can be continually reactivated by NaOH solution. More importantly, its high selectivity for Cu2+ provides a feasible way to recover Cu2+ from wastewater containing various cations.
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Affiliation(s)
- Lei Qin
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Yunliang Zhao
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA.
| | - Liang Wang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Lingbo Zhang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Shichang Kang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Wei Wang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Tingting Zhang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
| | - Shaoxian Song
- Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
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9
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Wang J, Liang J, Sun L, Li G, Temmink H, Rijnaarts HHM. Granule-based immobilization and activity enhancement of anammox biomass via PVA/CS and PVA/CS/Fe gel beads. Bioresour Technol 2020; 309:123448. [PMID: 32371320 DOI: 10.1016/j.biortech.2020.123448] [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] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 04/23/2020] [Accepted: 04/25/2020] [Indexed: 06/11/2023]
Abstract
Granule-based immobilization of anammox biomass assisted by polyvinyl alcohol/chitosan (PVA/CS) and PVA/CS/Fe gel beads was studied, via the operation of three identical up-flow reactors (R1 without gel beads, R2 with PVA/CS, R3 with PVA/CS/Fe) for 203 days. In the end, the nitrogen removal rates (NRR) were 5.3 ± 0.4, 10.0 ± 0.3 and 13.9 ± 0.5 kg-N m-3 d-1 for R1, R2 and R3, respectively. The porous PVA/CS and PVA/CS/Fe created a suitable eco-niche for anammox bacteria to grow and attach, thus being retained in the reactor. The EPS entangles newly grown cells within the gel beads, resulting in compact aggregation. The interaction between Fe ions added to PVA/CS/Fe gel beads and negatively charged EPS groups strongly promoted granule strength and compactness. The immobilization method proposed by this study was found to effectively improve biomass retention in the reactors, which is promising for advanced anammox process applications.
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Affiliation(s)
- Jinxing Wang
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jidong Liang
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Department of Environmental Technology, Wageningen University and Research, Wageningen 6700AA, the Netherlands.
| | - Li Sun
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Gaigai Li
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hardy Temmink
- Department of Environmental Technology, Wageningen University and Research, Wageningen 6700AA, the Netherlands
| | - Huub H M Rijnaarts
- Department of Environmental Technology, Wageningen University and Research, Wageningen 6700AA, the Netherlands
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10
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Huang X, Wu W, Xia Y, Li W, Gong Y, Li Z. Alkali resistant nanocomposite gel beads as renewable adsorbents for water phosphate recovery. Sci Total Environ 2019; 685:10-18. [PMID: 31170591 DOI: 10.1016/j.scitotenv.2019.05.296] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/17/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
Hydrous zirconium oxide (HZO) encapsulated alginate gel beads were synthesized for phosphate recovery from water. Importantly, we find that HZO/alginate gel beads (ZrA) crosslinked with Ca2+, Mg2+, Fe3+, Al3+, and Zr4+ are unstable under an intense alkali regeneration condition. Only Sr2+-crosslinked ZrA can endure a high alkali solution. ZrA possesses a high specific surface area (80.84 m2·g-1) and a mesoporous structure (15.3 nm and 0.196 cm3·g-1), which endow them with a high Langmuir adsorption capacity of 52.5 mg-P/g. ZrA can be easily recycled, and the mass loss of HZO is prevented. Furthermore, the strontium alginate gel framework protects the encapsulated HZO nanoparticles from adverse humic acid contamination. ZrA can be regenerated for at least 5 adsorption/desorption cycles. Cost analysis indicates the potential scale application feasibility for ZrA. This study provides a novel, simple, and environmentally benign solution to immobilize HZO for efficient phosphate recovery.
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Affiliation(s)
- Xuanqi Huang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Wufeng Wu
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Yan Xia
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Wanbin Li
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Yanyan Gong
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Zhanjun Li
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
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Wang J, Liang J, Sun L, Gao S. PVA/CS and PVA/CS/Fe gel beads' synthesis mechanism and their performance in cultivating anaerobic granular sludge. Chemosphere 2019; 219:130-139. [PMID: 30537586 DOI: 10.1016/j.chemosphere.2018.12.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 08/25/2018] [Revised: 11/14/2018] [Accepted: 12/02/2018] [Indexed: 06/09/2023]
Abstract
Biomass washout from high-speed anaerobic suspended bed bio-reactors is still a challenge to their stable operation. Preserving active biomass to efficiently retain biomass in the reactor is one of the solutions to this problem. Herein, two carriers (polyvinyl alcohol/chitosan (PVA/CS) and PVA/CS/Fe gel beads) were prepared using the cross-linking method. The fourier transform infrared (FTIR) and 13C nuclear magnetic resonance (13C NMR) analyses showed that PVA/CS gel beads formed mainly through hydrogen-bonds (NH2OH-). Furthermore, FTIR, 13C NMR, energy dispersive spectrum (EDS), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed that PVA/CS/Fe gel beads formed mainly through chelate bond (NH2-FeM+OH-). The scanning electron microscope (SEM) results affirmed that the gel beads had rough and well-developed porous structure for the attachment of microbes. Furthermore, the abilities of gel beads on the cultivation of granular sludge in an up-flow anaerobic sludge bed (UASB) reactor were effectively demonstrated while treating wastewater polluted with glucose and alkali lignin. The results showed that the gel beads-assisted reactors had a higher performance than those without the gel beads. The cultivation of granules in these reactors was accelerated, while the granules became bigger and exhibited better settling velocities. The reactor with gel beads was easier to withstand a higher organic loading rate due to dense microbial aggregates, which were caused by more humic-like substance. Particularly, the reactor with PVA/CS/Fe gel beads was able to improve the overall robustness of the system due to stronger mechanical properties of gel beads, and also prevented cells detachment.
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Affiliation(s)
- Jinxing Wang
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jidong Liang
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Li Sun
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Sha Gao
- Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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Abstract
High-throughput screening of a DNA library expressed in a bacterial population for identifying potentially rare members displaying a property of interest is a crucial step for success in many experiments such as directed evolution of proteins and synthetic circuits and deep mutational scanning to identify gain- or loss-of-function mutants. Here, I describe a protocol for high-throughput screening of bacterial (E. coli) microcolonies in gel beads. Single cells are encapsulated into monodisperse water-in-oil emulsion droplets produced with a microfluidic device. The aqueous solution also contains agarose that gelates upon cooling on ice, so that solid gel beads form inside the droplets. During incubation of the emulsion, the cells grow into monoclonal microcolonies inside the beads. After isolation of the gel beads from the emulsion and their sorting by fluorescence activated cell sorting (FACS), the bacteria are recovered from the gel beads and are then ready for a further round of sorting, mutagenesis or analysis. In order to sort by FACS, this protocol requires a fluorescent readout, such as the expression of a fluorescent reporter protein. Measuring the average fluorescent signals of microcolonies reduces the influence of high phenotypic cell-to-cell variability and increases the sensitivity compared to the sorting of single cells. We applied this method to sort a pBAD promoter library at ON and OFF states (Duarte et al., 2017).
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Affiliation(s)
- Yolanda Schaerli
- Department of Fundamental Microbiology, University of Lausanne, Lausanne, Switzerland
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Cheng B, Li D, Huo Q, Zhao Q, Lan Q, Cui M, Pan W, Yang X. Two kinds of ketoprofen enteric gel beads (CA and CS-SA) using biopolymer alginate. Asian J Pharm Sci 2018; 13:120-130. [PMID: 32104385 PMCID: PMC7032093 DOI: 10.1016/j.ajps.2017.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 09/06/2017] [Revised: 10/13/2017] [Accepted: 10/19/2017] [Indexed: 11/22/2022] Open
Abstract
To obtain expected rapid-release and sustained-release of ketoprofen gel beads, this paper adopted biopolymer alginate to prepare alginate beads and chitosan-alginate gel beads. Formulation factors were investigated and optimized by the single factor test. The release of ketoprofen from calcium alginate gel beads in pH 1.0 hydrochloric acid solution was less than 10% during 2 h, then in pH6.8 was about 95% during 45 min, which met the requirements of rapid-release preparations. However, the drug release of chitosan-alginate gel beads in pH1.0 was less than 5% during 2 h, then in pH6.8 was about 50% during 6 h and reached more than 95% during 12 h, which had a good sustained-release behavior. In addition, the release kinetics of keteprofen from the calcium alginate gel beads fitted well with the Korsmeyer-Peppas model and followed a case-II transport mechanism. However, the release of keteprofen from the chitosan-alginate gel beads exhibited a non-Fickian mechanism and based on the mixed mechanisms of diffusion and polymer relaxation from chitosan-alginate beads. In a word, alginate gel beads of ketoprofen were instant analgesic, while chitosan-alginate gel beads could control the release of ketoprofen during gastro-intestinal tract and prolong the drug's action time.
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Affiliation(s)
- Bingchao Cheng
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Dongyang Li
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Qiye Huo
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Qianqian Zhao
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Qi Lan
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Mengsuo Cui
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Weisan Pan
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
| | - Xinggang Yang
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road 110016, Shenyang, China
- State Key Laboratory of New-tech for Chinese Medicine Pharmaceutical Process, 222001, Jiangsu, Lianyungang, China
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Günter EA, Popeyko OV. Calcium pectinate gel beads obtained from callus cultures pectins as promising systems for colon-targeted drug delivery. Carbohydr Polym 2016; 147:490-499. [PMID: 27178956 DOI: 10.1016/j.carbpol.2016.04.026] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 03/29/2016] [Accepted: 04/06/2016] [Indexed: 11/16/2022]
Abstract
Low methyl-esterified pectins obtained from the cell walls of the campion (SV, SV>300), tansy (TV, TV>300) and duckweed (LM, LM>300) callus cultures and apple pectin (AP, Classic AU 701) were used as the carriers for colon delivery of prednisolone. The pectins with molecular weight more than 300kDa (SV>300, TV>300, LM>300) formed gels which exhibited the higher gel strength. The higher gel strength of these gels appeared to be related to the higher Mw and the lower degree of methylesterification (DE) of these pectins. Release aspects of prednisolone in the simulated gastric (pH 1.25), intestinal (pH 7.0) and colonic (pH 7.0+pectinase) media were investigated. The LM-5%, AP-3% and AP-5% beads destroyed in simulated intestinal medium probably due to the higher DE of the LM and AP pectins. The SV>300-3% and TV>300-3% prednisolone loaded bead systems showed a high stability at pH 1.25 and pH 7.0. Prednisolone release occurred in a larger extent in colonic medium due to the enzymatic erosion of the beads. The SV>300-3% and TV>300-3% particles showed a more controlled release that appeared to be related to the lower DE, rhamnogalacturonan content, rhamnogalacturonan I branching and the higher linearity and Mw of the TV>300 and SV>300 pectins, as well as to the higher gel strength. This in vitro study suggests that calcium pectinate gel beads obtained from callus cultures pectins can be proposed as potential systems for colon-targeted drug delivery.
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Affiliation(s)
- Elena A Günter
- Institute of Physiology, Komi Science Centre, The Urals Branch of the Russian Academy of Sciences, 50, Pervomaiskaya str., 167982 Syktyvkar, Russia.
| | - Oxana V Popeyko
- Institute of Physiology, Komi Science Centre, The Urals Branch of the Russian Academy of Sciences, 50, Pervomaiskaya str., 167982 Syktyvkar, Russia
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