Visible Light Assisted Heterogeneous Fenton-Like Degradation of Organic Pollutant via α-FeOOH/Mesoporous Carbon Composites
Visible Light Assisted Heterogeneous Fenton-Like Degradation of Organic Pollutant via α-FeOOH/Mesoporous Carbon Composites
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可见光辅助α-FeOOH/介孔碳复合材料对有机污染物的非均相类芬顿降解
DOI：
10.1021/acs.est.6b06429
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发表时间：
2017-04-04
影响因子：
11.4
通讯作者：
Zhao, Yixin
中科院分区：
文献类型：
--
作者：
Qian, Xufang;Ren, Meng;Zhao, Yixin
以羧基功能化介孔碳为载体，采用原位晶化法制备了新型α-FeOOH/介孔碳复合材料(α-FeOOH/MesoC)，作为一种新型可见光辅助非均相Fenton催化剂。可见光活性的α-FeOOH纳米晶被包裹在介孔骨架中，并通过C-O-Fe键在表面附着大的α-FeOOH微晶。在可见光照射的辅助下，α-FeOOH/MesoC的矿化效率提高，这是由于光催化促进了过氧化氢的催化作用超过了光热效应。在α-FeOOH/MesoC复合材料中，α-FeOOH和MesoC之间的协同作用比α-FeOOH和MesoC的混合催化剂提高了矿化效率。在α-FeOOH/MesoC复合材料上，铁的浸出受到了很大的抑制。有趣的是，重复使用的α-FeOOH/MesoC复合材料表现出比新鲜催化剂和均相Fenton体系(FeSO4/H2O2)更高的苯酚氧化和矿化效率。X射线光电子能谱(XPS)、X射线衍射谱(XRD)、傅立叶变换红外光谱(FTIR)和织构分析结果表明，α-FeOOH与介孔碳之间的界面含氧基团在第一次非均相Fenton反应后起到了很大的促进作用。综上所述，在α-FeOOH/MesoC复合体系中，可见光诱导的光催化辅助类非均相Fenton过程提高了Ho中心点的生成效率和Fe(III)/Fe(II)循环，并进一步激活了界面催化中心，最终实现了极高的降解和矿化效率。
A novel alpha-FeOOH/mesoporous carbon (alpha-FeOOH/MesoC) composite prepared by in situ crystallization of adsorbed ferric ions within carboxyl functionalized mesoporous carbon was developed as a novel visible light assisted heterogeneous Fenton-like catalyst. The visible light active alpha-FeOOH nanocrystals were encapsulated in the mesoporous frameworks accompanying with surface attached large alpha-FeOOH microcrystals via C-O-Fe bonding. Assisting with visible light irradiation on alpha-FeOOH/MesoC, the mineralization efficiency increased owing to the photocatalytic promoted catalyzing H2O2 beyond the photothermal effect. The synergistic effect between alpha-FeOOH and MesoC in alpha-FeOOH/MesoC composite improved the mineralization efficiency than the mixture catalyst of alpha-FeOOH and MesoC. The iron leaching is greatly suppressed on the alpha-FeOOH/MesoC composite. Interestingly, the reused alpha-FeOOH/MesoC composites showed much higher phenol oxidation and mineralization efficiencies than the fresh catalyst and homogeneous Fenton system (FeSO4/H2O2). The XPS, XRD, FTIR, and textural property results reveal that the great enhancement comes from the interfacial emerged oxygen containing groups between alpha-FeOOH and MesoC after the first heterogeneous Fenton-like reaction. In summary, visible light induced photocatalysis assisted heterogeneous Fenton-like process in the alpha-FeOOH/MesoC composite system improved the HO center dot production efficiency and Fe(III)/Fe(II) cycle and further activated the interfacial catalytic sites, which finally realize an extraordinary higher degradation and mineralization efficiency.