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Chen LH, Ban C, Helal MH, El-Bahy SM, Zeinhom M, Song S, Zhao YG, Lu Y. Preparation and modification of polymer microspheres, application in wastewater treatment: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 366:121807. [PMID: 39025011 DOI: 10.1016/j.jenvman.2024.121807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 06/19/2024] [Accepted: 07/07/2024] [Indexed: 07/20/2024]
Abstract
The removal of various pollutants from water is necessary due to the increasing requirements for the removal of various pollutants from wastewater and the quality of drinking water. Polymer microspheres are regarded as exemplary adsorbent materials due to their high adsorption efficiency, excellent adsorption performance, and ease of handling. Herein, the advantages and disadvantages of different preparation methods, modifications, applications and the current research status of polymer microspheres are summarized at large. Furthermore, the enhanced performance of modified composite microspheres is emphasized, including adsorption efficiency, thermal stability, and significant improvements in physical and chemical properties. Subsequently, the current applications and potential of polymeric microspheres for wastewater treatment, including the removal of inorganic and organic pollutants, heavy metal ions, and other contaminants are summarized. Finally, future research directions for polymer microspheres are proposed, outlining the challenges and solutions associated with the application of polymer microspheres in wastewater treatment.
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Affiliation(s)
- Li-Hui Chen
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China; College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310015, China
| | - Cao Ban
- Zhejiang Institute of Geosciences, Zhejiang, 310015, China
| | - Mohamed H Helal
- Department of Chemistry, Faculty of Arts and Science, Northern Border University, Rafha, Saudi Arabia
| | - Salah M El-Bahy
- Department of Chemistry, Turabah University College, Taif University, Turabah, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - M Zeinhom
- Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt
| | - Shuang Song
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Yong-Gang Zhao
- College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310015, China.
| | - Yin Lu
- College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310015, China.
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2
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El-Shafie AS, El-Azazy M. Crosslinked chitosan-montmorillonite composite and its magnetized counterpart for the removal of basic fuchsin from wastewater: Parametric optimization using Box-Behnken design. Int J Biol Macromol 2024; 263:130224. [PMID: 38387636 DOI: 10.1016/j.ijbiomac.2024.130224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/08/2024] [Accepted: 02/13/2024] [Indexed: 02/24/2024]
Abstract
Treating wastewater polluted with organic dyestuffs is still a challenge. In that vein, facile synthesis of a structurally simple composite of chitosan with montmorillonite (CS-MMT) using glutaraldehyde as a crosslinker and the magnetized analogue (MAG@CS-MMT) was proposed as versatile adsorbents for the cationic dye, basic Fuchsin (FUS). Statistical modeling of the adsorption process was mediated using Box-Behnken (BB) design and by varying the composite dose, pH, [FUS], and contact time. Characterization of both composites showed an enhancement of surface features upon magnetization, substantiating a better FUS removal of the MAG@CS-MMT (%R = 98.43 %) compared to CS-MMT (%R = 68.02 %). The surface area analysis demonstrates that MAG@CS-MMT possesses a higher surface area, measuring 41.54 m2/g, and the surface analysis of the magnetized nanocomposite, conducted using FT-IR and Raman spectroscopies, proved the presence of FeO peaks. In the same context, adsorption of FUS onto MAG@CS-MMT fitted-well to the Langmuir isotherm model and the maximum adsorption capacities (qm) were 53.11 mg/g for CS-MMT and 88.34 mg/g for MAG@CS-MMT. Kinetics investigation shows that experimental data fitted well to the pseudo-second order (PSO) model. Regeneration study reveals that MAG@CS-MMT can be recovered effectively for repeated use with a high adsorption efficiency for FUS.
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Affiliation(s)
- Ahmed S El-Shafie
- Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha 2713, Qatar
| | - Marwa El-Azazy
- Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha 2713, Qatar.
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3
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Sruamsiri D, Shimojima A, Ogawa M. Novel Floating Adsorbent for Water Treatment: Organically Modified Layered Alkali Silicate by Facile Mechanochemical Reaction. ACS APPLIED MATERIALS & INTERFACES 2023; 15:41130-41140. [PMID: 37594322 DOI: 10.1021/acsami.3c08229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
Adsorption serves as an effective way to collect (remove) contaminants from aqueous solution. In the present study, a novel floating adsorbent was designed through surface modification of a layered alkali silicate (octosilicate) using a silane coupling reagent (chlorodimethyl[3-(2,3,4,5,6-pentafluorophenyl)propyl]silane) to collect metal ions from water. By conducting the grafting by solvent-free mechanochemical reaction at room temperature, the external surface of octosilicate was modified to be hydrophobic while preserving the ion exchange capability in the interlayer space. Characterizations of XRD, IR, SEM, TGA, 29Si MAS NMR, and 19F MAS NMR confirmed the successful grafting at the external surface of octosilicate particles. The modified silicate demonstrated buoyancy at the air-water interface, facilitating the concentration of methylene blue, Ni2+, and Pb2+ from aqueous solutions. The adsorbed amounts of metal ions on the floating adsorbent were greater than those reported for the common nonfloating adsorbents (zeolites, clays, and clay minerals).
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Affiliation(s)
- Donhatai Sruamsiri
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
| | - Atsushi Shimojima
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Makoto Ogawa
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
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4
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Xiong YS, Li MX, Jia R, Zhou LS, Fan BH, Tang JY, Gai L, Li W, Lu HQ, Li K. Polyethyleneimine/polydopamine-functionalized self-floating microspheres for caramel adsorption: Interactions and phenomenological mass transfer kinetics. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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5
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Tang Q, Zhang F, Chen W, Ma D, Du B, Zhang K, Huang X, Luo H, Fan L, An X, Zhang X, Cheng L, Wei Z, Zheng H. Floating-separation adsorbent for methylene blue and Pb(II) removal: Structure construction and adsorption mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Li Y, An Y, Zhao R, Zhong Y, Long S, Yang J, Li J, Zheng H. Synergetic removal of oppositely charged dyes by co-precipitation and amphoteric self-floating capturer: Mechanism investigation by molecular simulation. CHEMOSPHERE 2022; 296:134033. [PMID: 35183578 DOI: 10.1016/j.chemosphere.2022.134033] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/24/2022] [Accepted: 02/15/2022] [Indexed: 06/14/2023]
Abstract
The adsorption performances of adsorbents to dyes are hard to maintain in a wide pH range because most of the reactions are pH-dependent, developing a cost-effective strategy to break the pH-limitation is significant. In this study, an amphoteric self-floating adsorbent (Am-SA) was synthesized by hollow silica microsphere surface modification, which was useful to capture anionic acid orange 7 (AO7) and cationic crystal violet (CV) dyes, but the adsorption performances were also greatly affected by pH. Fortunately, a co-precipitation phenomenon was noticed when the AO7 and CV solutions were mixed with a 1:1 molecule ratio. The precise structures of AO7 and CV molecules were constructed and the AO7-CV-H2O mixed system was structured by Materials Studio. Besides, this system was involved in a dynamic simulation to reveal the mechanism of the co-precipitation phenomenon. The simulation results showed H2O molecules dispersed out of the system via thermal motions within 30 ps, but the AO7 and CV molecules aggregated to each other via electrostatic attractions. The energy calculations also demonstrated the electrostatic attraction between AO7 and CV is the dominant factor that induced the aggregation. The aggregation phenomena were also observed in various mixed cationic-anionic dyes systems. The removals of dyes significantly improved in a wide pH range in the mixed systems as the captures of the aggregated dye clusters were much easier than that of independent dye molecules, and both co-precipitation and adsorption contributed to it. Proper utilization of the aggregation behaviors between dyes can be regarded as a prospective strategy in cost-effective treatments.
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Affiliation(s)
- Yisen Li
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Yanyan An
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
| | - Rui Zhao
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Yiran Zhong
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Siyu Long
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Junling Yang
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Jialin Li
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Huaili Zheng
- College of Environment and Ecology, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
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7
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Sun Y, Gu Y, Zha Q. A novel surface imprinted resin for the selective removal of metal-complexed dyes from aqueous solution in batch experiments: ACB GGN as a representative contaminant. CHEMOSPHERE 2021; 280:130611. [PMID: 33934001 DOI: 10.1016/j.chemosphere.2021.130611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 03/12/2021] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
Metal-complexed dyes are harmful to the environment and human health because they contain heavy metals and complex organic ligands. It is difficult to separate and recover these dyes from wastewater owing to their complex components and poor selectivity of common adsorbents. In this study, a novel surface molecularly imprinted polymer (SMIP) was prepared using 4-vinyl pyridine as the functional monomer and polystyrene resin as the carrier. SMIP showed better adsorption performance than non-imprinted polymer (SNIP) in the whole pH range with the best adsorption capacity at pH 1.5. The correlation coefficients (R2) fitted by Langmuir and Temkin models were greater than 0.97, and the adsorption was a spontaneous exothermic process. The pseudo-second-order and Elovich models fitted the adsorption kinetic curves well. The adsorption capacity of SMIP was approximately 20% higher than that of SNIP in the salt concentration ranging from 2 to 80 mg/L. In selective adsorption experiments, the relative selectivity coefficients (I) of SMIP for competitors were all greater than 2.41, and the Cr (Ⅲ) components of ACB GGN played a more important role in the recognition performance of SMIP than the sulfonic groups. Adsorption mechanism tests revealed that although the adsorption of ACB GGN by SMIP mainly relied on electrostatic attraction, hydrophobic interactions, π-π conjugation, and Cr (Ⅲ) coordination were also involved. These results show that SMIP has excellent selective adsorption properties for ACB GGN and a promising application potential in the treatment of metal-complexed dye wastewater.
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Affiliation(s)
- Yue Sun
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, 210096, China.
| | - Yingpeng Gu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, 210096, China
| | - Qingyi Zha
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, 210096, China
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8
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Jiang X, Li Y, Tang X, Jiang J, He Q, Xiong Z, Zheng H. Biopolymer-based flocculants: a review of recent technologies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:46934-46963. [PMID: 34263401 PMCID: PMC8279699 DOI: 10.1007/s11356-021-15299-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Biopolymer-based flocculants have become a potential substitute for inorganic coagulants and synthetic organic flocculants due to their wide natural reserves, environmental friendliness, easy natural degradation, and high material safety. In recent years, with more and more attention to clean technologies, a lot of researches on the modification and application of biopolymer-based flocculants have been carried out. The present paper reviews the latest important information about the base materials of biopolymer-based flocculants, including chitosan, starch, cellulose, and lignin etc. This review also highlights the various modification methods of these base materials according to reaction types in detail. Via the recent researches, the flocculation mechanisms of biopolymer-based flocculants, such as adsorption, bridging, charge neutralization, net trapping, and sweeping, as well as, some other special mechanisms are comprehensively summarized. This paper also focuses on the water treatment conditions, the removal efficiency, and advantages of biopolymer-based flocculants in applications. Further, this review sheds light on the future perspectives of biopolymer-based flocculants, which may make progress in the sources of base materials, modification processes, multi-function, and deepening application researches. We believe that this review can guide the further researches and developments of biopolymer-based flocculants in the future, to develop them with a higher efficiency, a lower cost, more safety, and multi-function for more diversified applications. Graphical abstract.
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Affiliation(s)
- Xincheng Jiang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Yisen Li
- Digital Chongqing Big Data Application Development Co., Ltd, Chongqing, 400000, People's Republic of China
| | - Xiaohui Tang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Junyi Jiang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Qiang He
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Zikang Xiong
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Huaili Zheng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China.
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, People's Republic of China.
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9
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Removal of Acid Orange 7 dye in a packed bed bioreactor: Process optimization using response surface methodology and kinetic study. ACTA ACUST UNITED AC 2021. [DOI: 10.1016/j.biteb.2020.100620] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Wang Y, Geng Q, Yang J, Liu Y, Liu C. Hybrid System of Flocculation-Photocatalysis for the Decolorization of Crystal Violet, Reactive Red X-3B, and Acid Orange II Dye. ACS OMEGA 2020; 5:31137-31145. [PMID: 33324822 PMCID: PMC7726949 DOI: 10.1021/acsomega.0c04285] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/21/2020] [Indexed: 05/12/2023]
Abstract
A hybrid system of flocculation-photocatalysis (HSFP) was applied to evaluate the color removal from simulative dye wastewater. The decolorization performance of HSFP was investigated considering four key factors: flocculant dosage, pH, turbidity, and ionic strength. Compared with flocculation alone, HSFP showed better decolorization effectiveness for simulative Crystal Violet-Reactive Red X-3B dye wastewater (CV-RR) and simulative Crystal Violet-Acid Orange II dye wastewater (CV-AO). The dosage of flocculant was determined by the molecular structure of target dyes. A higher dosage was required for the color removal of dyes with a lower molecular weight and less sulfonic acid groups. The dominant decolorization mechanism was different with different initial pH values of simulative dye wastewater, which influenced the decolorization efficiency of flocculation and photocatalysis. For dyes with a lower molecular weight and less sulfonic acid groups, better decolorization performance was achieved under neutral conditions, mainly depending on strong charge neutralization and adsorption bridging capacity. For dyes with a higher molecular weight and more sulfonic acid groups, decolorization efficiency was improved with an increase in pH, due to stronger deprotonation. An increase of turbidity reduced the dye removal efficiency of flocculation alone and HSFP. The presence of NaCl, CuCl2, and CrCl3 led to a different decrease in the flocculation efficiency and photodegradation efficiency.
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Affiliation(s)
- Yuanfang Wang
- Department
of Chemistry-Chemical & Environment Engineering, Weifang University, Weifang 261061, P. R. China
| | - Qijin Geng
- Department
of Chemistry-Chemical & Environment Engineering, Weifang University, Weifang 261061, P. R. China
| | - Jinmei Yang
- Department
of Chemistry-Chemical & Environment Engineering, Weifang University, Weifang 261061, P. R. China
| | - Ying Liu
- Department
of Chemistry-Chemical & Environment Engineering, Weifang University, Weifang 261061, P. R. China
| | - Chen Liu
- School
of Environmental Science and Engineering, Qingdao University, Qingdao 266071, P. R. China
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Chen W, Tang Q, Liu Z, Luo F, Liao Y, Zhao S, Zhang K, Cheng L, Ma D. Fabricating a novel chitosan-based adsorbent with multifunctional synergistic effect for Cu(II) removal: Maleic anhydride as a connecting bridge. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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Akpomie KG, Conradie J. Efficient synthesis of magnetic nanoparticle-Musa acuminata peel composite for the adsorption of anionic dye. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.07.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Huang Y, Wu Y, Wang Y, Meng X, Liu X. Highly Efficient and Recyclable Fe‐OMS‐2 Catalyst for Enhanced Degradation of Acid Orange 7 in Aqueous Solution. ChemistrySelect 2020. [DOI: 10.1002/slct.201903907] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yu Huang
- College of Materials and Chemical EngineeringKey Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsMaterial Analysis and Testing CenterChina Three Gorges University Yichang Hubei 443002
| | - You Wu
- College of Materials and Chemical EngineeringKey Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsMaterial Analysis and Testing CenterChina Three Gorges University Yichang Hubei 443002
| | - Yanlan Wang
- College of Chemistry and Chemical EngineeringLiaocheng University Liaocheng Shandong 252059 China
| | - Xu Meng
- State Key Laboratory for Oxo Synthesis and Selective OxidationSuzhou Research Institute of LICPLanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lanzhou 730000
| | - Xiang Liu
- College of Materials and Chemical EngineeringKey Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsMaterial Analysis and Testing CenterChina Three Gorges University Yichang Hubei 443002
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14
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An Y, Zheng H, Sun Q, Zheng X, Liu W, Tang X, Xiong Z. Two-step synthesis of a single-layer grafting self-floating adsorbent for anionic dyes adsorption, surface separation and concentration. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121262. [PMID: 31586922 DOI: 10.1016/j.jhazmat.2019.121262] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/09/2019] [Accepted: 09/19/2019] [Indexed: 05/26/2023]
Abstract
In the case of a sharp increase in the price of dyes, the dyes concentration of in wastewater is important for environmental protection and industrial costs reduction. In this study, we grafted single-layer amino groups onto the surface of the hollow glass microspheres by a two-step simple synthesis, and the anionic dyes adsorption process reaches equilibrium within 10 min. The as-synthesized adsorbent has self-floating ability to achieve high-efficiency surface solid-liquid separation with water. SEM, EDS, SBET, FT-IR, XPS, TGA characterizations results demonstrated the successful grafting of amino groups and the important role of the pretreatment process in the two-step synthesis. The results of adsorption isotherms and kinetics show the adsorption process belongs to single-layer adsorption with equal adsorption sites, and the adsorption capacities for acid orange 7 and amaranth reach 428.99 mg g-1 and 145.62 mg g-1, respectively. Regeneration of the adsorbent and concentration of the dye solutions can be achieved by dispersing the separated adsorbent in alkaline solution, the maximum concentrated concentration of acid orange 7 and amaranth was 6321.57 mg L-1 and 2431.84 mg L-1, respectively. This study provides new insights for the solid-liquid separation of water treatment agents and the resource regenerating of dyeing wastewater.
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Affiliation(s)
- Yanyan An
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China
| | - Huaili Zheng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China.
| | - Qiang Sun
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Xinyu Zheng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Wangqing Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Xiaomin Tang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Zikang Xiong
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China
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15
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Magnetic Template Anion Polyacrylamide-Polydopamine-Fe 3O 4 Combined with Ultraviolet/H 2O 2 for the Rapid Enrichment and Degradation of Diclofenac Sodium from Aqueous Environment. Polymers (Basel) 2020; 12:polym12010072. [PMID: 31906534 PMCID: PMC7023637 DOI: 10.3390/polym12010072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/15/2019] [Accepted: 12/22/2019] [Indexed: 12/27/2022] Open
Abstract
In this study, a novel system was set up by preparing a magnetic flocculant combining with ultraviolet/H2O2 to realize the rapid enrichment and degradation of diclofenac sodium (DCFS). For the magnetic flocculant, template anion polyacrylamide (TAPAM) with anion micro-block structure was prepared. Thereafter, polydopamine was used to modify TAPAM, Fe3O4 nanoparticles was grafted to the modified TAPAM by chelation, named template anion polyacrylamide-polydopamine-Fe3O4 (TAPAM-PDA-Fe3O4). Furthermore, the TAPAM-PDA-Fe3O4 preparation protocol was optimized by the response surface method (RSM). In the DCFS enrichment section, the rapid separation of flocs from water was realized by an external magnetic field and it indicated that the π–π stacking effect was dominant in neutral/alkaline condition, whereas charge neutralization was favored in acidic conditions. Meanwhile, a DCFS enrichment kinetic curve was much fitted by the pseudo-second-order kinetic model and DCFS enrichment isothermal curve was close to the Freundlich isothermal model, indicating the dependence of DCFS quantity enriched by TAPAM-PDA-Fe3O4 and a multilayer heterogeneous enrichment process. The degradation experiment confirmed that DCFS was effectively degraded by ultraviolet/H2O2/TAPAM-PDA-Fe3O4 and the maximum value of DCFS degradation efficiency reached 98.1%. Furthermore, the regeneration experiment showed that the enrichment and degradation efficiency of DCFS could maintain a relatively high level in the initial three recycles.
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