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Jiang Z, Li J, Huang G, Yan L, Ma J. Efficient removal of ethidium bromide from aqueous solutions using chromatin-loaded chitosan polyvinyl alcohol composites. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:3276-3295. [PMID: 38085489 DOI: 10.1007/s11356-023-31364-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 11/30/2023] [Indexed: 01/18/2024]
Abstract
In this work, a novel chromatin-loaded chitosan polyvinyl alcohol composite was developed as a simple, efficient and environmentally friendly adsorbent for the efficient removal of ethidium bromide (EtBr). SEM images showed that the composites were characterized by dense porous and uniformly distributed morphology. The BET analysis showed the presence of mesopores and macropores in the composites. FTIR and XRD results showed that the chromatin was uniformly dispersed in the chitosan-polyvinyl alcohol carrier through hydrogen bonding. The fluorescence microscopy images showed the change of fluorescence effect before and after the adsorption of the material, which indicated that the chromatin was uniformly distributed in the composites and had a good adsorption effect. The optimal experimental conditions were T = 30℃, t = 120 min, pH = 7.4, m = 0.2 g when the composite with only 5% chromatin content had the ability to adsorb EtBr efficiently (minimum concentration 2 mg·L-1: adsorption rate 99%; maximum concentration 20 mg·L-1: adsorption rate 90%).The adsorption kinetics and thermodynamics showed that the EtBr adsorption kinetics of the composite conformed to the pseudo-second-order kinetic model (0.995 < R2 < 0.999) and the Freundlich isothermal model, and was a spontaneous process (ΔH < 0). This study on the immobilization of chromatin will provide a new way and reference for the application of chromatin in the treatment of EtBr pollutants.
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Affiliation(s)
- Zhikang Jiang
- School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Wenchang Road 2, Liuzhou, 545006, Guangxi, China
| | - Junsheng Li
- School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Wenchang Road 2, Liuzhou, 545006, Guangxi, China.
| | - Guoxia Huang
- School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Wenchang Road 2, Liuzhou, 545006, Guangxi, China
| | - Liujuan Yan
- School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Wenchang Road 2, Liuzhou, 545006, Guangxi, China
| | - Ji Ma
- School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Wenchang Road 2, Liuzhou, 545006, Guangxi, China
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2
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Ding C, Long X, Zeng G, Ouyang Y, Lei B, Zeng R, Wang J, Zhou Z. Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:3051. [PMID: 36833743 PMCID: PMC9965299 DOI: 10.3390/ijerph20043051] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 02/03/2023] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
The excessive application of phosphate fertilizers easily causes water eutrophication. Phosphorus recovery by adsorption is regarded as an effective and simple intervention to control water bodies' eutrophication. In this work, a series of new adsorbents, layered double hydroxides (LDHs)-modified biochar (BC) with different molar ratios of Mg2+ and Fe3+, were synthesized based on waste jute stalk and used for recycling phosphate from wastewater. The prepared LDHs-BC4 (the molar ratio of Mg/Fe is 4:1) has significantly high adsorption performance, and the recovery rate of phosphate is about 10 times higher than that of the pristine jute stalk BC. The maximum adsorption capacity of LDHs-BC4 for phosphate was 10.64 mg-P/g. The main mechanism of phosphate adsorption mainly includes electrostatic attraction, ion exchange, ligand exchange, and intragranular diffusion. Moreover, the phosphate-adsorbed LDHs-BC4 could promote mung bean growth, which indicated the recovery phosphate from wastewater could be used as a fertilizer.
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Affiliation(s)
- Chunxia Ding
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Xiuyu Long
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Guangyong Zeng
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Yu Ouyang
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Bowen Lei
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Rongying Zeng
- College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421001, China
| | - Jing Wang
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Zhi Zhou
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
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3
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Sadalage PS, Pawar KD. Adsorption and removal of ethidium bromide from aqueous solution using optimized biogenic catalytically active antibacterial palladium nanoparticles. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:5005-5026. [PMID: 35978236 DOI: 10.1007/s11356-022-22526-7] [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: 03/21/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Due to being low cost and eco-friendly, biological nanomaterial synthesis and development have made broad spectral progress. This study aimed to optimize the phytomediated synthesis of catalytically active, antibacterial palladium nanoparticles (PdNPs) for adsorption-based removal of ethidium bromide (EtBr) from an aqueous solution. Optimization of synthesis demonstrated that a precursor to extract ratio of 4:1, pH 3, and incubation at 80 °C for 60 min were the optimum conditions that led to the synthesis of negatively charged, highly stable, polycrystalline, spherical, and monodispersed PdNPs of 5-10 nm. When tested as catalysts, PdNPs successfully catalyzed Suzuki-Miyaura cross-coupling between aryl halides and arylboronic acids resulting in the synthesis of 4-acetylbiphenyl. Furthermore, the antibacterial activity test demonstrated that biogenic PdNPs were most effective and potent against Staphylococcus aureus and Proteus vulgaris followed by Escherichia coli, Bacillus subtilis, and Bacillus cereus. In addition, PdNPs were found as an excellent adsorbent for adsorption of EtBr from water as the adsorption reaction obeyed pseudo-second-order kinetics with a linear regression coefficient (R2 > 0.995). The adsorption reaction fitted well with the Freundlich and Temkin isotherm models, indicating multi-layer adsorption. Estimating thermodynamic parameters resulted in a positive value of ΔH0 and ΔG0, demonstrating adsorption was non-spontaneous and endothermic.
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Affiliation(s)
| | - Kiran D Pawar
- School of Nanoscience and Biotechnology, Shivaji University, Kolhapur, Maharashtra, India.
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4
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Simultaneous removal of organic inorganic composite contaminants by in situ double modified biochar: Performance and mechanisms. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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5
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Zhao H, Zhang D, Sun H, Zhao Y, Xie M. Adsorption and detection of heavy metals from aqueous water by PVDF/ATP-CDs composite membrane. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128573] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Mohamed‐Ibrahim NAB, Kheng Boong S, Zhong Ang Z, Shiuan Ng L, Tan JYC, Chong C, Kwee Lee H. Applying Magnetic‐Responsive Nanocatalyst‐Liquid Interface for Active Molecule Manipulation to Boost Catalysis Beyond Diffusion Limit. ChemCatChem 2022. [DOI: 10.1002/cctc.202200036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nur Amalina binte Mohamed‐Ibrahim
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Siew Kheng Boong
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Zhi Zhong Ang
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Li Shiuan Ng
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Jia Ying Charlene Tan
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Carice Chong
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Hiang Kwee Lee
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
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Kongcharoen H, Coester B, Yu F, Aziz I, Poh WC, Tan MWM, Tonanon P, Ciou JH, Chan B, Webster RD, Lew WS, Lee PS. Magnetically Directed Co-nanoinitiators for Cross-Linking Adhesives and Enhancing Mechanical Properties. ACS APPLIED MATERIALS & INTERFACES 2021; 13:57851-57863. [PMID: 34843200 DOI: 10.1021/acsami.1c08040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Magnetically directed localized polymerization is of immense interest for its extensive impacts and applications in numerous fields. The use of means untethered from an external magnetic field to localize initiation of polymerization to develop a curing system is a novel concept, with a sustainable, efficient, and eco-friendly approach and a wide range of potential in both science and engineering. However, the conventional means for the initiation of polymerization cannot define the desirable location of polymerization, which is often exacerbated by the poor temporal control in the curing system. Herein, the copper-immobilized dendrimer-based magnetic iron oxide silica (MNPs-G2@Cu2+) co-nanoinitiators are rationally designed as initiators for redox radical polymerization. The nanoinitiators are magnetically responsive and therefore enable localized polymerization using an external magnetic field. In this work, anaerobic polymerization of an adhesive composed of triethylene glycol dimethacrylate, tert-butyl peroxybenzoate, and MNPs-G2@Cu2+ as the magnetic co-nanoinitiators has been investigated. The use of a magnet locates and promotes redox free radical polymerization through the synergistic functions between peroxide and MNPs-G2@Cu2+ co-nanoinitiators. The mechanical properties of the resulting polymer are considerably reinforced because the MNPs-G2@Cu2+ co-nanoinitiators concurrently play another crucial role as nanofillers. This strategy provides a novel approach for magnetically tunable localized polymerization, which allows new opportunities to govern the formulation of advanced adhesives through polymerization under hazard-free conditions for various promising applications.
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Affiliation(s)
- Haruethai Kongcharoen
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Birte Coester
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Fei Yu
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Izzat Aziz
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Wei Church Poh
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Matthew Wei Ming Tan
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Panyawut Tonanon
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Jing-Hao Ciou
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Benjamin Chan
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Richard D Webster
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Wen Siang Lew
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Pooi See Lee
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
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8
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Weeraphan C, Thawornpan P, Thanapongpichat S, Srinoun K, Win Tun A, Srisomsap C, Svasti J, Buncherd H. Application of the Magnetic Fraction of Fly Ash as a Low-Cost Heterogeneous Fenton Catalyst for Degrading Ethidium Bromide. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.1977313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Churat Weeraphan
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, Thailand
| | | | | | - Kanitta Srinoun
- Faculty of Medical Technology, Prince of Songkla University, Songkhla, Thailand
| | - Aung Win Tun
- Faculty of Graduate Studies, Mahidol University, Nakhon Pathom, Thailand
| | | | - Jisnuson Svasti
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, Thailand
| | - Hansuk Buncherd
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, Thailand
- Faculty of Medical Technology, Prince of Songkla University, Songkhla, Thailand
- Medical Science Research and Innovation Institute, Prince of Songkla University, Songkhla, Thailand
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Eltaweil AS, El-Monaem EMA, Mohy-Eldin MS, Omer AM. Fabrication of attapulgite/magnetic aminated chitosan composite as efficient and reusable adsorbent for Cr (VI) ions. Sci Rep 2021; 11:16598. [PMID: 34400760 PMCID: PMC8368087 DOI: 10.1038/s41598-021-96145-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/02/2021] [Indexed: 02/07/2023] Open
Abstract
An efficient composite was constructed based on aminated chitosan (NH2Cs), attapulgite (ATP) clay and magnetic Fe3O4 for adsorptive removal of Cr(VI) ions. The as-fabricated ATP@Fe3O4-NH2Cs composite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), Zeta potential (ZP), Vibrating Sample Magnetometer (VSM), Brunauer-Emmett-Teller method (BET) and X-ray photoelectron spectroscope (XPS). A significant improve in the adsorption profile was established at pH 2 in the order of ATP@Fe3O4-NH2Cs(1:3) > ATP@Fe3O4-NH2Cs(1:1) > ATP@Fe3O4-NH2Cs(3:1) > Fe3O4-NH2Cs > ATP. The maximum removal (%) of Cr(VI) exceeded 94% within a short equilibrium time of 60 min. The adsorption process obeyed the pseudo 2nd order and followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 294.12 mg/g. In addition, thermodynamics studies elucidated that the adsorption process was spontaneous, randomness and endothermic process. Interestingly, the developed adsorbent retained respectable adsorption properties with acceptable removal efficiency exceeded 58% after ten sequential cycles of reuse. Besides, the results hypothesize that the adsorption process occurs via electrostatic interactions, reduction of Cr(VI) to Cr(III) and ion-exchanging. These findings substantiate that the ATP@Fe3O4-NH2Cs composite could be effectively applied as a reusable adsorbent for removing of Cr(VI) ions from aqueous solutions.
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Affiliation(s)
| | - Eman M Abd El-Monaem
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Mohamed S Mohy-Eldin
- Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt
| | - Ahmed M Omer
- Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt.
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10
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Wang J, Tang J. Fe-based Fenton-like catalysts for water treatment: Catalytic mechanisms and applications. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115755] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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11
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Liu Y, Gan Y, Zhao C, Yang J, Zhu H, Li Y, Shuai S, Hao J. Shaping Magnetite by Hydroxyl Group Numbers of Small Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5582-5590. [PMID: 33938217 DOI: 10.1021/acs.langmuir.1c00424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Despite numerous reports on magnetite formation with the assistance of various additives, the role of hydroxyl group (-OH) numbers in small polyol molecules has not yet been understood well. We selected small molecules containing different -OH numbers, such as ethanol, ethylene glycol, propanetriol, butanetetrol, pentitol, hexanehexol, and cyclohexanehexol, as additives in coprecipitation. By increasing the -OH number in these small polyol molecules, the formation of crystallization was slowed, and the size and shape of magnetite were regulated as well possibly due to the changed complexation strength and the stability of the precursor. The increase in temperature and the Fe2+/Fe3+ ratio can reduce the complexation strength. The nucleation and growth of magnetite proceed possibly through the aggregation of polyol-stabilized amorphous complexes and two-line ferrihydrite with low crystallinity based on the -OH numbers, suggesting a nonclassical pathway. The as-prepared magnetite showed a r2/r1 ratio after in vitro MRI measurement as follows: Fe3O4@He-6OH rod < Fe3O4@Pr-3OH sheet < Fe3O4@Pe-5OH cube. The Fe3O4@He-6OH rod and Fe3O4@Pr-3OH sheet displayed T1-T2 dual modal contrast ability, while the Fe3O4@Pe-5OH cube can be T2-dominated. This research provides a simple but an essential approach for designing MRI contrast agents.
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Affiliation(s)
- Yu Liu
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Ying Gan
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Cong Zhao
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Jingxuan Yang
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Hongyu Zhu
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Yang Li
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Shirong Shuai
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
| | - Jianyuan Hao
- School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054 China
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12
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Magnetite-Based Catalyst in the Catalytic Wet Peroxide Oxidation for Different Aqueous Matrices Spiked with Naproxen–Diclofenac Mixture. Catalysts 2021. [DOI: 10.3390/catal11040514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Magnetite supported on multiwalled carbon nanotubes catalysts were synthesized by co-precipitation and hydrothermal treatment. The magnetic catalysts were characterized by X-ray diffraction, Fourier-transform infrared spectrometry, thermogravimetric analysis and N2 physisorption. The catalysts were then tested for their ability to remove diclofenac (DCF) and naproxen (NAP) from an aqueous solution at different conditions (pH, temperature, and hydrogen peroxide) to determine the optimum conditions for chemical oxidation. The optimization of the process parameters was conducted using response surface methodology (RSM) coupled with Box–Behnken design (BBD). By RSM–BBD methodology, the optimal parameters (1.75 mM H2O2 dosage, 70 °C and pH 6.5) were determined, and the removal percentages of NAP and DCF were 19 and 54%, respectively. The NAP–DCF degradation by catalytic wet peroxide oxidation (CWPO) was caused by •OH radicals. In CWPO of mixed drug solutions, DCF and NAP showed competitive oxidation. Hydrophobic interactions played an important role during the CWPO process. On the other hand, the magnetic catalyst reduced its activity after the second cycle of reuse. In addition, proof of concept and disinfection tests performed at the operating conditions showed results following the complexity of the water matrices. In this sense, the magnetic catalyst in CWPO has adequate potential to treat water contaminated with NAP–DCF mixtures.
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Yao X, Liu T, Xie Y, Chu Z, Jin W. In Situ-Forming Magnetic Fe 3O 4 Nanoroses on Defect-Controllable Mesoporous Graphene Oxide for Enzyme-Mimic Sensing. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c03706] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaoyue Yao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road(S), Nanjing 211816, P. R. China
| | - Tao Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road(S), Nanjing 211816, P. R. China
| | - Ying Xie
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road(S), Nanjing 211816, P. R. China
| | - Zhenyu Chu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road(S), Nanjing 211816, P. R. China
| | - Wanqin Jin
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu Road(S), Nanjing 211816, P. R. China
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Xiong H, Shen X, Cui C, Cheng L, Xu Y. Synthesis of nanospindle-akaganéite and its photocatalytic degradation for methyl orange. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:481-491. [PMID: 32960793 DOI: 10.2166/wst.2020.348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Iron oxyhydroxides as important catalysts and environmental mineral materials have drawn significant interest for their potential applications in the field of wastewater treatment. In this work, we investigated the influence of nonionic surfactant Brij30 or glucose (0.01 wt%) on the formation of iron precipitates in iron(III) chloride solutions for 3 days at 40, 60 and 80 °C. The results showed that the presence of glucose or Brij30 could promote the nanospindle-akaganéite formation and the akaganéite with a length of 300-500 nm obtained at 60 °C was the optimal catalyst for organic photocatalysis degradation. Further, we investigated the capacity of C60 akaganéite for degradation removal of methyl orange (MO) under the action of hydrogen peroxide (H2O2) addition and/or UV irradiation, and in the presence of different radical scavengers at pH 4.5. We also researched the effects of various levels of H2O2 and catalyst, and the reaction pH values. It was found that akaganéites could remove almost 100% of MO under 100 mg·L-1 of catalyst and H2O2 at pH 4.5. Akaganéite maintained 86% of MO removal capacity after four successive cycles. Our results can be used as a reference for the synthesis of environmentally functional material and the application in photocatalytic degradation of organic pollutant.
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Affiliation(s)
- Huixin Xiong
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China E-mail:
| | - Xingyu Shen
- College of Civil Engineering, Yangzhou University, Yangzhou 225127, China
| | - Can Cui
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China E-mail:
| | - Lin Cheng
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China E-mail:
| | - Yiqun Xu
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China E-mail:
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15
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Bao T, Damtie MM, Hosseinzadeh A, Wei W, Jin J, Phong Vo HN, Ye JS, Liu Y, Wang XF, Yu ZM, Chen ZJ, Wu K, Frost RL, Ni BJ. Bentonite-supported nano zero-valent iron composite as a green catalyst for bisphenol A degradation: Preparation, performance, and mechanism of action. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 260:110105. [PMID: 31941635 DOI: 10.1016/j.jenvman.2020.110105] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 01/02/2020] [Accepted: 01/06/2020] [Indexed: 05/28/2023]
Abstract
Bisphenol A (BPA) is a toxic environmental pollutant commonly found in wastewater. Using non-toxic materials and eco-friendly technology to remove this pollutant from wastewater presents multiple advantages. Treatment of wastewater with clay minerals has received growing interest because of the environment friendliness of these materials. Bentonite is a 2:1 layered phyllosilicate clay mineral that can support nano-metal catalysts. It can prevent the agglomeration of nano-metal catalysts and improve their activity. In this article, a green catalytic nano zero-valent iron/bentonite composite material (NZVI@bentonite) was synthesized via liquid-phase reduction. The average size of NZVI was approximately 40-50 nm. Good dispersion and low aggregation were observed when NZVI was loaded on the surface or embedded into the nanosheets of bentonite. Degradation of BPA, a harmful contaminant widely found in wastewater at relatively high levels, by NZVI@bentonite was then investigated and compared with that by pristine NZVI through batch Fenton-like reaction experiments. Compared with pristine NZVI and bentonite alone, the NZVI@bentonite showed a higher BPA degradation ratio and offered highly effective BPA degradation up to 450 mg/g in wastewater under optimum operating conditions. Adsorption coupled with the Fenton-like reaction was responsible for BPA degradation by NZVI@bentonite. This work extends the application of NZVI@bentonite as an effective green catalyst for BPA degradation in aqueous environments.
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Affiliation(s)
- Teng Bao
- School of Biology, Food and Environment Engineering, Hefei University, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia; Institute of Environment Engineering, Hefei University, China; Anhui Key Laboratory of Sewage Purification and Eco-restoration Materials, Hefei, China; School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Queensland, 4001, Australia
| | - Mekdimu Mezemir Damtie
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia; Department of Civil and Environmental Engineering, KICT School, University of Science & Technology (UST), 34113, 217, Gajeong-ro, Yuseong-gu, Daejeon, South Korea
| | - Ahmad Hosseinzadeh
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Wei Wei
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Jie Jin
- School of Biology, Food and Environment Engineering, Hefei University, China; Institute of Environment Engineering, Hefei University, China; Anhui Key Laboratory of Sewage Purification and Eco-restoration Materials, Hefei, China.
| | - Hoang Nhat Phong Vo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Jing Song Ye
- School of Biology, Food and Environment Engineering, Hefei University, China
| | - Yiwen Liu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Xiao Fei Wang
- School of Biology, Food and Environment Engineering, Hefei University, China
| | - Zhi Min Yu
- School of Biology, Food and Environment Engineering, Hefei University, China; Institute of Environment Engineering, Hefei University, China; Anhui Key Laboratory of Sewage Purification and Eco-restoration Materials, Hefei, China
| | - Zhi Jie Chen
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Ke Wu
- School of Biology, Food and Environment Engineering, Hefei University, China; Institute of Environment Engineering, Hefei University, China; Anhui Key Laboratory of Sewage Purification and Eco-restoration Materials, Hefei, China
| | - Ray L Frost
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Queensland, 4001, Australia
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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16
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Lian J, Yi Y, Zhang N, Fang Z. Effective degradation of tetracycline by magnetic palygorskite synthesized with different dosages of NaOH. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 81:1452-1460. [PMID: 32616697 DOI: 10.2166/wst.2020.194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In the process of preparing magnetic palygorskite from waste pickling liquor of the steel industry, the dosage of NaOH will affect the properties of the magnetic palygorskite. The experimental results showed that magnetic palygorskite can be effectively prepared when NaOH dosage is between 255 and 330 g/L. Vibration sample magnetometry proved that different NaOH dosages can affect the saturation magnetization of magnetic palygorskite. The catalytic performance of five catalysts synthesized with different NaOH dosages hardly changed after five cycles of Fenton-like catalytic degradation of tetracycline (TC). The magnetic palygorskite prepared by this method had good catalytic performance even when the catalyst preparation conditions were magnified ten times, which can provide a reference for large-scale preparation of magnetic palygorskite.
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Affiliation(s)
- Jintao Lian
- School of Environment, South China Normal University, University Town, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China and Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China E-mail: ;
| | - Yunqiang Yi
- School of Environment, South China Normal University, University Town, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China and Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China E-mail: ;
| | - Nuanqin Zhang
- School of Environment, South China Normal University, University Town, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China and Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China E-mail: ;
| | - Zhanqiang Fang
- School of Environment, South China Normal University, University Town, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China and Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University, Guangzhou 510006, China E-mail: ;
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17
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de Almeida HC, Salomão ALDS, Lambert J, Teixeira LCRS, Marques M. Phycoremediation potential of microalgae species for ethidium bromide removal from aqueous media. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2020; 22:1168-1174. [PMID: 32208865 DOI: 10.1080/15226514.2020.1743968] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ethidium Bromide (EtBr) is an organic compound used in molecular biology investigations. EtBr ability of intercalating in the DNA molecule makes it a toxic substance. The objective was to evaluate the phycoremediation potentials of Chlorella vulgaris, Desmodesmus subspicatus and Raphidocelis subcapitata tested separately and in a mixture (Mix) for EtBr removal from the aqueous medium. Experiments were conducted using an initial algae biomass of 106 cell/mL, exposed to 500 µg/L of EtBr. The removal efficiency (µg EtBr L-1) after 3 h in each treatment were: Mix (72.8 µg.L-1) >D. subspicatus (48.4 µg.L-1) >R. subcapitata (24.6 µg.L-1) >C. vulgaris (19.9 µg.L-1). However, when EtBr mass reduction per microalgae density is considered (ng.algae-1), the efficiency ranking changes to: D. subspicatus (1.9 × 10-5 ng.algae-1) >C. vulgaris (1.4 × 10-5 ng.algae-1) >Mix (9.8 × 10-6 ng.algae-1) >R. subcapitata (2.8 × 10-6 ng.algae-1). The results suggest that initial algal population density is a determinant factor for efficient EtBr removal by microalgae species in short term treatments. In order to obtain 100% of EtBr removal, it should be necessary 1010, 1010 and 1011 algae.mL-1 of C. vulgaris, D. subspicatus and R. subcapitata, respectively. The results strongly suggest phycoremediation can be explored as an alternative method for EtBr removal.
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Affiliation(s)
- Heleno Cavalcante de Almeida
- Department of Sanitary and Environmental Engineering, Rio de Janeiro State University - UERJ, Rio de Janeiro, RJ, Brazil
| | - André Luís de Sá Salomão
- Department of Sanitary and Environmental Engineering, Rio de Janeiro State University - UERJ, Rio de Janeiro, RJ, Brazil
| | - Janaina Lambert
- Department of Sanitary and Environmental Engineering, Rio de Janeiro State University - UERJ, Rio de Janeiro, RJ, Brazil
| | | | - Marcia Marques
- Department of Sanitary and Environmental Engineering, Rio de Janeiro State University - UERJ, Rio de Janeiro, RJ, Brazil
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18
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Álvarez-Torrellas S, Munoz M, Mondejar V, de Pedro ZM, Casas JA. Boosting the catalytic activity of natural magnetite for wet peroxide oxidation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:1176-1185. [PMID: 29860695 DOI: 10.1007/s11356-018-2171-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 04/26/2018] [Indexed: 06/08/2023]
Abstract
This work explores the modification of naturally occurring magnetite by controlled oxidation (200-400 °C, air atmosphere) and reduction (300-600 °C, H2 atmosphere) treatments with the aim of boosting its activity in CWPO. The resulting materials were fully characterized by XRD, XPS, TGA, TPR, SEM, and magnetization measurements, allowing to confirm the development of core-shell type structures. The magnetite core of the solid remained unchanged upon the treatment whereas the Fe(II)/Fe(III) ratio of the shell was modified (e.g. 0.42, 0.11 and 0.63 values were calculated for pristine Fe3O4, Fe3O4-O400, and Fe3O4-R400, respectively). The performance of the catalysts was tested in the CWPO of sulfamethoxazole (SMX) (5 mg L-1) under ambient conditions and circumneutral pH (pH0 = 5), using the stoichiometric dose of H2O2 (25 mg L-1) and a catalyst load of 1 g L-1. The key role of the ferrous species on the mineral shell was evidenced. Whereas the oxidation of magnetite led to significantly slower degradation rates of the pollutant, its reduction gave rise to a dramatic increase, achieving the complete removal of SMX in 1.5 h reaction time with the optimum catalyst (Fe3O4-R400) compared to the 3.5 h required with the pristine mineral. A reaction mechanism was proposed for SMX degradation, and a kinetic equation based on the Eley-Rideal model was accordingly developed. This model successfully fitted the experimental results. The stability of Fe3O4-R400 was evaluated upon five sequential runs. Finally, the versatility of the catalytic system was proved in real environmentally relevant water matrices.
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Affiliation(s)
- Silvia Álvarez-Torrellas
- Seccion Departamental Ingenieria Quimica, Universidad Autonoma de Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain.
- Departamento de Ingenieria Quimica, Universidad Complutense de Madrid, Av. Complutense S/N, 28040, Madrid, Spain.
| | - Macarena Munoz
- Seccion Departamental Ingenieria Quimica, Universidad Autonoma de Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain
| | - Victor Mondejar
- Seccion Departamental Ingenieria Quimica, Universidad Autonoma de Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain
| | - Zahara M de Pedro
- Seccion Departamental Ingenieria Quimica, Universidad Autonoma de Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain
| | - Jose A Casas
- Seccion Departamental Ingenieria Quimica, Universidad Autonoma de Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain
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19
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Yi Y, Tu G, Zhao D, Tsang PE, Fang Z. Pyrolysis of different biomass pre-impregnated with steel pickling waste liquor to prepare magnetic biochars and their use for the degradation of metronidazole. BIORESOURCE TECHNOLOGY 2019; 289:121613. [PMID: 31202177 DOI: 10.1016/j.biortech.2019.121613] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/04/2019] [Accepted: 06/06/2019] [Indexed: 06/09/2023]
Abstract
In this study, Fenton-like catalysts (magnetic biochar) were synthesised by pyrolysis the different biomass pre-impregnated with steel pickling waste liquor. The results of degradation of metronidazole illustrated that the catalytic performance of magnetic biochar was significantly affected by biomass feedstocks. Electron spin resonance (ESR) and radical quenching experiments showed that the hydroxide radicals (OH) were the key reactive oxygen species responsible for the metronidazole removal. Levels of OH varied among different systems consistent with the removal of metronidazole. The activation of H2O2 by carbon-containing components and Fe species (Fe2O3 and Fe3O4) in magnetic biochar were confirmed to be less crucial to the degradation of metronidazole. Moreover, the Fe(II) (FeO) in magnetic biochar played the dominating role in degradation of metronidazole, and the Fe(II) content difference caused by biomass feedstocks was responsible for differences in the catalytic performance of different types of magnetic biochar.
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Affiliation(s)
- Yunqiang Yi
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China
| | - Guoquan Tu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China
| | - Dongye Zhao
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA
| | - Pokeung Eric Tsang
- Department of Science and Environmental Studies, Education University of Hong Kong, 00852, Hong Kong, China
| | - Zhanqiang Fang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
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20
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Ge Z, Sun T, Xing J, Fan X. Efficient removal of ethidium bromide from aqueous solution by using DNA-loaded Fe 3O 4 nanoparticles. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:2387-2396. [PMID: 30467750 DOI: 10.1007/s11356-018-3747-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Ethidium bromide (EtBr) is widely used as DNA-staining dyes for the detection of nucleic acids in laboratories and known to be powerful mutagens and carcinogens. In the present paper, the removal of EtBr from aqueous solutions in a batch system using DNA-loaded Fe3O4 nanoparticles as a simple and efficient method was investigated. DNA was covalently loaded on the surface of Fe3O4 magnetic nanoparticles, which was confirmed by FT-IR analysis and zeta potential measurements. The morphology and crystal structure were characterized by SEM, TEM, and XRD. The influence factors on the removal efficiency such as initial EtBr concentration, contact time, adsorbent dose, pH, and temperature were also studied. The removal process of EtBr can be completed quickly within 1 min. The removal efficiency was more than 99% while the EtBr concentration was routinely used (0.5 mg L-1) in biology laboratories and the dosages of nanoparticles were 1 g L-1. For the different EtBr concentrations from 0.5 to 10 mg L-1 in aqueous solution, the goal of optimized removal was achieved by adjusting the dosage of DNA-loaded Fe3O4 nanoparticles. The optimum pH was around 7 and the operational temperature from 4 to 35 °C was appropriate. Kinetic studies confirmed that the adsorption followed second-order reaction kinetics. Thermodynamic data revealed that the process was spontaneous and exothermic. The adsorption of EtBr on DNA-loaded Fe3O4 nanoparticles fitted well with the Freundlich isotherm model. These results indicated that DNA-loaded Fe3O4 nanoparticles are a promising adsorbent for highly efficient removal of EtBr from aqueous solution in practice.
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Affiliation(s)
- Zhiqiang Ge
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300072, People's Republic of China
| | - Tingting Sun
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300072, People's Republic of China
| | - Jinfeng Xing
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300072, People's Republic of China
| | - Xuejiao Fan
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300072, People's Republic of China.
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21
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Ahmed SN, Haider W. Heterogeneous photocatalysis and its potential applications in water and wastewater treatment: a review. NANOTECHNOLOGY 2018; 29:342001. [PMID: 29786601 DOI: 10.1088/1361-6528/aac6ea] [Citation(s) in RCA: 169] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
There has been a considerable amount of research in the development of sustainable water treatment techniques capable of improving the quality of water. Unavailability of drinkable water is a crucial issue especially in regions where conventional drinking water treatment systems fail to eradicate aquatic pathogens, toxic metal ions and industrial waste. The research and development in this area have given rise to a new class of processes called advanced oxidation processes, particularly in the form of heterogeneous photocatalysis, which converts photon energy into chemical energy. Advances in nanotechnology have improved the ability to develop and specifically tailor the properties of photocatalytic materials used in this area. This paper discusses many of those photocatalytic nanomaterials, both metal-based and metal-free, which have been studied for water and waste water purification and treatment in recent years. It also discusses the design and performance of the recently studied photocatalytic reactors, along with the recent advancements in the visible-light photocatalysis. Additionally, the effects of the fundamental parameters such as temperature, pH, catalyst-loading and reaction time have also been reviewed. Moreover, different techniques that can increase the photocatalytic efficiency as well as recyclability have been systematically presented, followed by a discussion on the photocatalytic treatment of actual wastewater samples and the future challenges associated with it.
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Affiliation(s)
- Syed Nabeel Ahmed
- School of Engineering & Technology, Central Michigan University, Mt. Pleasant, MI 48859, United States of America
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22
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Tiwari A, Verma NC, Singh A, Nandi CK, Randhawa JK. Carbon coated core-shell multifunctional fluorescent SPIONs. NANOSCALE 2018; 10:10389-10394. [PMID: 29845158 DOI: 10.1039/c8nr01941j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Due to their unique magnetic properties, multiple surface functionality and biocompatibility, superparamagnetic iron oxide nanoparticles (SPIONs) show very promising characteristics as magnetic resonance (MR) contrast agents in biomedical applications. However, a lack of fluorescence makes SPIONs inappropriate for multimodal bioimaging. SPIONs surface functionalized by either organic fluorescent molecules or semiconductor quantum dots (QDs) have been reported as bioimaging probes but subsequent deterioration of the fluorescent dyes due to low photostability and quick photobleaching limits their long term practical application. In addition, QDs are found to be toxic in nature. Here, we present a novel one step method to synthesize non-toxic carbon coated highly photostable core-shell magnetic and fluorescent SPIONs with long-lasting fluorescence alongside a superior magnetic resonance (MR) imaging ability. Apart from the highly comparable superparamagnetic properties of the SPIONs, the optical response of the material is much better than commonly used Rhodamine or cyanine dyes.
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Affiliation(s)
- Ashish Tiwari
- School of Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh, India.
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23
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Wang S, Zhou Y, Han S, Wang N, Yin W, Yin X, Gao B, Wang X, Wang J. Carboxymethyl cellulose stabilized ZnO/biochar nanocomposites: Enhanced adsorption and inhibited photocatalytic degradation of methylene blue. CHEMOSPHERE 2018; 197:20-25. [PMID: 29328988 DOI: 10.1016/j.chemosphere.2018.01.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 11/25/2017] [Accepted: 01/06/2018] [Indexed: 06/07/2023]
Abstract
Biochar(BC)-supported nanoscaled zinc oxide (nZO) was encapsulated either with (nZORc/BC) or with no (nZOR/BC) sodium carboxymethyl cellulose (CMC). The X-ray diffraction and ultraviolet (UV)-visible-near infrared spectrophotometry revealed that nZO of 16, 10, and 20 nm with energy band gaps of 2.79, 3.68 and 2.62 eV were synthesized for nZOR/BC, nZORc/BC and nZO/BC, respectively. The Langmuir isotherm predicted saturated sorption of methylene blue (MB) was 17.01 g kg-1 for nZORc/BC, over 19 times greater than nZOR/BC and nZO/BC. Under UV irradiation, 10.9, 61.6, 83.1, and 41.6% of MB were degraded for nZORc/BC, nZO/BC, nZOR/BC and BC. The scavenging experiment revealed hydroxyl radical dominated CMC degradation. Exogenous CMC (2 g L-1) increased MB sorption from 10.6% to 73.1%, but decreased MB degradation from 80.7% to 41.1%, relative to nZOR/BC. Thus, CMC could increase MB sorption by electrostatic attraction and other possible mechanisms. The compromised MB degradation may be ascribed to reduced availability of hydroxyl and superoxide radicals to degrade MB, and increased band gap energy of ZnO.
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Affiliation(s)
- Shengsen Wang
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong, China; Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin, 300191, China
| | - Yanxia Zhou
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China
| | - Shuwen Han
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China
| | - Nong Wang
- Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin, 300191, China
| | - Weiqin Yin
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China
| | - Xianqiang Yin
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Xiaozhi Wang
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China
| | - Jun Wang
- College of Resources and Environment, Key Laboratory of Agricultural Environment in Universities of Shandong, Shandong Agricultural University, Taian, 271018, PR China.
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24
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Zhang P, Zhang X, Kang X, Liu H, Chen C, Xie C, Han B. Salt-mediated synthesis of bimetallic networks with structural defects and their enhanced catalytic performances. Chem Commun (Camb) 2018; 54:12065-12068. [DOI: 10.1039/c8cc07029f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Bimetallic alloys with abundant of structural defects and enhanced catalytic performances were prepared tailoring by salts.
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Affiliation(s)
- Pei Zhang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Xiudong Zhang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Xinchen Kang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Huizhen Liu
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Chunjun Chen
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Chao Xie
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
| | - Buxing Han
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Colloid and Interface and Thermodynamics
- CAS Research/Education Center for Excellence in Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
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