Reusable Polyacrylonitrile-Sulfur Extractor of Heavy Metal Ions from Wastewater

Li Peng; Jiang Haibin; Barr ArielRen ZhichuGao RuiWang HuaFan WeiweiZhu MeifangXu GuiyinLi Ju

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Reusable Polyacrylonitrile-Sulfur Extractor of Heavy Metal Ions from Wastewater

机译：Reusable Polyacrylonitrile-Sulfur Extractor of Heavy Metal Ions from Wastewater

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Mercury, lead, and cadmium are among the most toxic and carcinogenic heavy metal ions (HMIs), posing serious threats to the sustainability of aquatic ecosystems and public health. There is an urgent need to remove these ions from water by a cheap but green process. Traditional methods have insufficient removal efficiency and reusability. Structurally robust, large surface-area adsorbents functionalized with high-selectivity affinity to HMIs are attractive filter materials. Here, an adsorbent prepared by vulcanization of polyacrylonitrile (PAN), a nitrogen-rich polymer, is reported, giving rise to PAN-S nanoparticles with cyclic pi-conjugated backbone and electronic conductivity. PAN-S can be coated on ultra-robust melamine (ML) foam by simple dipping and drying. In agreement with hard/soft acid/base theory, N- and S-containing soft Lewis bases have strong binding to Hg2+, Pb2+, Cu2+, and Cd2+, with extraordinary capture efficiency and performance stability. Furthermore, the used filters, when collected and electrochemically biased in a recycling bath, can release the HMIs into the bath and electrodeposit on the counter-electrode as metallic Hg-0, Pb-0, Cu-0, and Cd-0, and the PAN-S@ML filter can then be reused at least 6 times as new. The electronically conductive PAN-S@ML filter can be fabricated cheaply and holds promise for scale-up applications.

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来源
《Advanced functional materials》 |2021年第51期|2105845.1-2105845.10|共10页
作者
Li Peng; Jiang Haibin; Barr ArielRen ZhichuGao RuiWang HuaFan WeiweiZhu MeifangXu GuiyinLi Ju;
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作者单位

MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA|MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA;

Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China;

MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA|MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA|Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R ChinaChina Univ Min & Technol, Sch Environm Sci & Spatial Informat, Xuzhou 221008, Jiangsu, Peoples R China|MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA|MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USAMIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA|MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA|SINOPEC Beijing Res Inst Chem Ind, Beijing 100013, Peoples R China;

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正文语种英语
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drinking water filters; electro-desorption; metal recovery; recycling; soft lewis acids;

Reusable Polyacrylonitrile-Sulfur Extractor of Heavy Metal Ions from Wastewater

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