Efficient heavy metal removal from water by alginate-based porous nanocomposite hydrogels: The enhanced removal mechanism and influencing factor insight
Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide (GO@PAN-PPy) as reinforcing fillers into the alginate matrix (GO@PAN-PPy/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized...
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| Published in | Journal of hazardous materials Vol. 418; p. 126358 |
|---|---|
| Main Authors | , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
15.09.2021
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| Subjects | |
| Online Access | Get full text |
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| Abstract | Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide (GO@PAN-PPy) as reinforcing fillers into the alginate matrix (GO@PAN-PPy/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized GO with Py-to-An mass ratios of monomers (from nil to 1:1) and contents of GO@PAN-PPy (from nil to 2.0%(w/v)) were embedded into the alginate backbone to improve the sorption performance. Key factors, such as pH, coexisting metal ions, and swelling states were investigated in batch adsorption modes. The synergistic effect combined from polymer backbone and fillers could lower the impact of the pH-dependent adsorption reaction. With an adsorption ability superior to that of plain SA and GO/SA, the optimized GO@PAN-PPy-2(1)/SA exhibited good experimental maximum adsorption capacities for Cr(VI) (~133.7 mg/g) and Cu(II) (~87.2 mg/g) at pH 3.0, which were better than those of many other similar sorbents. The sorbents possessed excellent adaptability for 0.2 M salt for Cr(VI) removal but poor for Cu(II) removal. Pre-swelling treatment and co-adsorption could enhance the adsorption performance. The excellent reusability of hydrogel was demonstrated after five cycles in single/binary system. Overall, this work reveals that the resultant hydrogel holds potential as candidate sorbent to remove anionic-cationic heavy metal ions from water.
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•Synergism between components help to 3D network formation and pollutants removal.•Key factors of the composite hydrogel for removing Cr(VI)/Cu(II) were evaluated.•A better adsorption capacity than most of other alginate-based sorbents.•Sorption-reduction dominated Cr(VI) removal while that of Cu(II) was cation-exchange. |
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| AbstractList | Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide (GO@PAN-PPy) as reinforcing fillers into the alginate matrix (GO@PAN-PPy/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized GO with Py-to-An mass ratios of monomers (from nil to 1:1) and contents of GO@PAN-PPy (from nil to 2.0%(w/v)) were embedded into the alginate backbone to improve the sorption performance. Key factors, such as pH, coexisting metal ions, and swelling states were investigated in batch adsorption modes. The synergistic effect combined from polymer backbone and fillers could lower the impact of the pH-dependent adsorption reaction. With an adsorption ability superior to that of plain SA and GO/SA, the optimized GO@PAN-PPy-2(1)/SA exhibited good experimental maximum adsorption capacities for Cr(VI) (~133.7 mg/g) and Cu(II) (~87.2 mg/g) at pH 3.0, which were better than those of many other similar sorbents. The sorbents possessed excellent adaptability for 0.2 M salt for Cr(VI) removal but poor for Cu(II) removal. Pre-swelling treatment and co-adsorption could enhance the adsorption performance. The excellent reusability of hydrogel was demonstrated after five cycles in single/binary system. Overall, this work reveals that the resultant hydrogel holds potential as candidate sorbent to remove anionic-cationic heavy metal ions from water.
[Display omitted]
•Synergism between components help to 3D network formation and pollutants removal.•Key factors of the composite hydrogel for removing Cr(VI)/Cu(II) were evaluated.•A better adsorption capacity than most of other alginate-based sorbents.•Sorption-reduction dominated Cr(VI) removal while that of Cu(II) was cation-exchange. |
| ArticleNumber | 126358 |
| Author | Zhang, Huining He, Qiulai Wang, Hongyu Zhang, Wei Song, Jianyang Zhou, Lean Gao, Yang Sun, Shiquan Ou, Ji Tang, Meiyi Wang, Bin |
| Author_xml | – sequence: 1 givenname: Wei surname: Zhang fullname: Zhang, Wei organization: School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China – sequence: 2 givenname: Ji surname: Ou fullname: Ou, Ji organization: School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China – sequence: 3 givenname: Bin surname: Wang fullname: Wang, Bin organization: School of Civil Engineering, Wuhan University, Wuhan 430072, China – sequence: 4 givenname: Hongyu surname: Wang fullname: Wang, Hongyu email: hywang96@126.com organization: School of Civil Engineering, Wuhan University, Wuhan 430072, China – sequence: 5 givenname: Qiulai surname: He fullname: He, Qiulai organization: Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China – sequence: 6 givenname: Jianyang surname: Song fullname: Song, Jianyang organization: School of Civil Engineering, Nanyang Institute of Technology, Nanyang 473004, China – sequence: 7 givenname: Huining surname: Zhang fullname: Zhang, Huining organization: School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China – sequence: 8 givenname: Meiyi surname: Tang fullname: Tang, Meiyi organization: China West Construction Hunan Group Co. Ltd., Changsha 410114, China – sequence: 9 givenname: Lean surname: Zhou fullname: Zhou, Lean organization: School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China – sequence: 10 givenname: Yang surname: Gao fullname: Gao, Yang organization: School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China – sequence: 11 givenname: Shiquan surname: Sun fullname: Sun, Shiquan email: shiquan_sun@csust.edu.cn organization: School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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