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A magnetic γ-Fe2O3@PANI@TiO2 core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-30 , DOI: 10.1039/d0na00171f
Yuan Wang 1 , Ping Zhang 1 , Tian C Zhang 2 , Gang Xiang 3 , Xinlong Wang 1 , Simo Pehkonen 4 , Shaojun Yuan 1
Affiliation  

Arsenic polluted groundwater impairs human health and poses severe threats to drinking water supplies and ecosystems. Hence, an efficient method of simultaneous oxidation of As(III) to As(V), and removal of As(V) from water has triggered increasing attention. In this study, a magnetic γ-Fe2O3 core–shell heterojunction nanocomposite was synthesized by means of hydrothermal crystallization of TiO2 on the surface of the magnetic core–shell loaded with polyaniline (γ-Fe2O3@PANI@TiO2). As an efficient photocatalyst coupled with adsorption, γ-Fe2O3@PANI@TiO2 has a high light utilization and good adsorption capacity. Notably, the nanocomposite has excellent stability at various initial pH values with good reusability. Among the co-existing ions investigated, PO43− has the greatest competitive reaction. The photocatalytic oxidation of As(III) on γ-Fe2O3@PANI@TiO2 is dominated by the synergy of several active substances, with superoxide free radicals and photogenerated holes being the major players.

中文翻译:


磁性γ-Fe2O3@PANI@TiO2核壳纳米复合材料通过可见光诱导光催化氧化吸附过程去除砷



砷污染的地下水损害人类健康,并对饮用水供应和生态系统构成严重威胁。因此,一种同时将As( III )氧化为As( V )并从水中去除As( V )的有效方法引起了越来越多的关注。本研究通过负载聚苯胺的磁性核壳表面TiO 2水热结晶合成了磁性γ-Fe 2 O 3核壳异质结纳米复合材料(γ-Fe 2 O 3 @PANI@TiO 2 )。 γ-Fe 2 O 3 @PANI@TiO 2作为一种高效的吸附耦合光催化剂,具有较高的光利用率和良好的吸附能力。值得注意的是,该纳米复合材料在各种初始pH值下均具有优异的稳定性,并且具有良好的可重复使用性。在研究的共存离子中,PO 4 3−具有最大的竞争反应。 γ-Fe 2 O 3 @PANI@TiO 2上As( III )的光催化氧化主要由多种活性物质的协同作用主导,其中超氧自由基和光生空穴是主要参与者。
更新日期:2020-03-30
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