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Fang R, Shiu BC, Ye Y, Zhang Y, Xue H, Lou CW, Lin JH. Electrospun cationic nanofiber membranes for adsorption and determination of Cr( vi) in aqueous solution: adsorption characteristics and discoloration mechanisms. RSC Adv 2021; 11:31795-31806. [PMID: 35496856 PMCID: PMC9041616 DOI: 10.1039/d1ra05917c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 09/01/2021] [Indexed: 11/21/2022] Open
Abstract
In this study, a novel cationic nanofiber membrane with various functional groups, good structural stability, and high adsorption capacity of Cr(vi) is presented. This nanofiber membrane is prepared by electrospinning a mixed aqueous solution of a cationic polycondensate (CP) and polyvinyl alcohol (PVA). With the aid of PVA, CP can be smoothly electrospun without using any organic solvents, and the cross-linking between CP and PVA improves the stability of membrane in acidic solution. Chemical and morphology characterization reveals that the CP/PVA membrane is composed of interwoven nanofibers that contain numerous cationic groups. Due to its high cationicity and hydrophilicity, the CP/PVA membrane shows great affinity for HCr2O7− and Cr2O72−. Adsorption experiments indicate that the CP/PVA membrane can remove Cr(vi) from simulated wastewater rapidly and efficiently in both batch and continuous mode. Besides, the presence of most coexisting ions will not interfere with the adsorption. Due to the redox reaction between the CP/PVA membrane and adsorbed Cr(vi), the CP/PVA membrane exhibits distinct color change after Cr(vi) adsorption and the discoloration is highly dependent on the adsorption amount. Therefore, in addition to serving as a highly efficient adsorbent, the CP/PVA membrane is also expected to be a convenient and low-cost method for semi-quantitative determination of Cr(vi) in wastewater. Cationic nanofiber membranes are prepared by electrospinning mixed aqueous solution of a cationic polycondensate (CP) and PVA. Apart from being a highly efficient Cr(vi) adsorbent, it can also serve as a convenient method for Cr(vi) determination.![]()
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Affiliation(s)
- Run Fang
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, Fuzhou 350108, China
| | - Bing-Chiuan Shiu
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, Fuzhou 350108, China
| | - Yuansong Ye
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, Fuzhou 350108, China
| | - Yuchi Zhang
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, Fuzhou 350108, China
| | - Hanyu Xue
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Fujian Engineering and Research Center of New Chinese Lacquer Materials, Fuzhou 350108, China
| | - Ching-Wen Lou
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
- Advanced Medical Care and Protection Technology Research Center, College of Textile and Clothing, Qingdao University, Shandong 266071, China
- School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan, China
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung 41354, Taiwan, China
| | - Jia-Horng Lin
- Department of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China
- Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
- Advanced Medical Care and Protection Technology Research Center, College of Textile and Clothing, Qingdao University, Shandong 266071, China
- Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung 40724, Taiwan, China
- School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan, China
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Zhang R, Zeng Q, Guo P, Cui Y, Sun Y. Efficient capture of Cr(VI) by carbon hollow fibers with window-like structure. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:16763-16773. [PMID: 32141002 DOI: 10.1007/s11356-020-07939-6] [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: 10/07/2019] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Removal of toxic Cr(VI) from contaminated water is significant for environmental protection. High efficient adsorbents with outstanding adsorption performance are highly demanded. Herein, we reported that window-like structured carbon hollow fibers (WL-CHF) derived from Enteromorpha prolifera could capture toxic Cr(VI) from aqueous solutions with high adsorption capacity, fast adsorption rate, and excellent recyclable performance. The excellent adsorption performance could be attributed to the unique structure that combines a variety of advantages: large specific surface area, fast diffusion processes, and easy access of adsorption sites for Cr(VI). In addition, the adsorption process was fitted well with pseudo-second-order model and Langmuir isotherm model. The potential mechanism on Cr(VI) removal includes reduction-cation exchange and electrostatic interaction with surface oxygen-containing functional groups. This study highlights new opportunities for designing adsorbents for Cr(VI) removal from Cr-polluted water.
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Affiliation(s)
- Rongrong Zhang
- School of Environmental Science and Engineering, Collaborative Innovation Center for Marine Biomass Fiber, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, 266071, People's Republic of China
| | - Qian Zeng
- School of Environmental Science and Engineering, Collaborative Innovation Center for Marine Biomass Fiber, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, 266071, People's Republic of China
| | - Peng Guo
- School of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China
| | - Yuqian Cui
- School of Environmental Science and Engineering, Collaborative Innovation Center for Marine Biomass Fiber, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, 266071, People's Republic of China.
| | - Yuanyuan Sun
- School of Environmental Science and Engineering, Collaborative Innovation Center for Marine Biomass Fiber, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, 266071, People's Republic of China.
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Fluoride in Drinking Water and Nanotechnological Approaches for Eliminating Excess Fluoride. JOURNAL OF NANOTECHNOLOGY 2019. [DOI: 10.1155/2019/2192383] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Arising awareness of health hazards due to long-term exposure of fluoride has led researchers to seek for more innovative strategies to eliminate excess fluoride in drinking water. Fluoride-bearing chemicals in both natural and anthropogenic sources contaminate drinking water, which mainly cause for human fluoride ingestion. Hence, developing sustainable approaches toward alleviation is essential. Among many emerging techniques of defluoridation, nanotechnological approaches stand out owing to its high efficiency, and hence, as in many areas, nanotechnology for excess fluoride removal in water is gaining ground compared to other conventional adsorbents and process. The present review focuses on some of the advanced and recent nanoadsorbents including their strengths and shortcomings (e.g., CNT, LDH, graphene-based nanomaterials, and magnetic nanomaterials) and other processes involving nanotechnology while discussing basic aspects of hydrochemistry of fluoride and geological conditions leading for water fluoride contamination. Considering all the findings in survey, it is evident that developing more sustainable techniques is essential rather than conducting batch-type experiments solely.
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