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      Advanced Modified Polyacrylonitrile Membrane with Enhanced Adsorption Property for Heavy Metal Ions

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          Abstract

          Advanced modified polyacrylonitrile (PAN) membrane with high adsorption property for heavy metal ions was designed and fabricated for the first time. The introduced diazoresin-ethylenediaminetetraacetic acid (DR-EDTA) layer could effectively absorb the metal ion, such as Cu 2+, Pb 2+, Hg 2+ in the waste water. The effects of layers, metal ion concentration, pH, temperature and cycle time were investigated. The results showed that the adsorption isotherms for Cu 2+ were well fitted by Langmuir model. The maximum adsorption capacity of the modified membrane for Cu 2+ was approximately 47.6 mg/g. In addition, the prepared PAN-(DR-EDTA) 3 membrane could be regenerated more than 720 h based on their adsorption/desorption cycles. The results demonstrated that the modified PAN membrane could be used as effective adsorbents for heavy metal removal from waste water.

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          Ultrathin Graphene Nanofiltration Membrane for Water Purification

          Yi Han, Zhen Xu, Chao Gao (2013)
          Article 0 comments Cited 345 times – based on 0 reviews     Review now
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            Enabling graphene oxide nanosheets as water separation membranes.

            Meng Hu, Baoxia Mi (2013)
            We report a novel procedure to synthesize a new type of water separation membrane using graphene oxide (GO) nanosheets such that water can flow through the nanochannels between GO layers while unwanted solutes are rejected by size exclusion and charge effects. The GO membrane was made via layer-by-layer deposition of GO nanosheets, which were cross-linked by 1,3,5-benzenetricarbonyl trichloride, on a polydopamine-coated polysulfone support. The cross-linking not only provided the stacked GO nanosheets with the necessary stability to overcome their inherent dispensability in water environment but also fine-tuned the charges, functionality, and spacing of the GO nanosheets. We then tested the membranes synthesized with different numbers of GO layers to demonstrate their interesting water separation performance. It was found that the GO membrane flux ranged between 80 and 276 LMH/MPa, roughly 4-10 times higher than that of most commercial nanofiltration membranes. Although the GO membrane in the present development stage had a relatively low rejection (6-46%) of monovalent and divalent salts, it exhibited a moderate rejection (46-66%) of Methylene blue and a high rejection (93-95%) of Rhodamine-WT. We conclude the paper by emphasizing that the facile synthesis of a GO membrane exploiting the ideal properties of inexpensive GO materials offers a myriad of opportunities to modify its physicochemical properties, potentially making the GO membrane a next-generation, cost-effective, and sustainable alternative to the long-existing thin-film composite polyamide membranes for water separation applications.
            Article 0 comments Cited 297 times – based on 0 reviews     Review now
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              Competitive adsorption of Pb2+, Cu2+ and Cd2+ ions from aqueous solutions by multiwalled carbon nanotubes

              Dehai Wu, Yan-Hui Li, Jun Bing Ding … (2003)
              Article 0 comments Cited 130 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Hailin Cong: hailincong@yahoo.com
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 19 January 2018
                Publication date PMC-release: 19 January 2018
                Publication date Collection: 2018
                Volume: 8
                Electronic Location Identifier: 1260
                Affiliations
                [1 ]ISNI 0000 0001 0455 0905, GRID grid.410645.2, Institute of Biomedical Materials and Engineering, , College of Chemistry and Chemical Engineering, Qingdao University, ; Qingdao, 266071 China
                [2 ]ISNI 0000 0001 0455 0905, GRID grid.410645.2, Laboratory for New Fiber Materials and Modern Textile, , Growing Base for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, ; Qingdao, 266071 China
                Article
                Publisher ID: 19597
                DOI: 10.1038/s41598-018-19597-3
                PMC ID: 5775326
                PubMed ID: 29352203
                SO-VID: 8aff054e-6e54-4d5a-8542-0a2a3794d43c
                Copyright © © The Author(s) 2018
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 26 September 2017
                Date accepted : 4 January 2018
                Categories
                Subject: Article
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                issue-copyright-statement © The Author(s) 2018

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