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Photocatalytic degradation of phenol by the heterogeneous Fe3O4 nanoparticles and oxalate complex system

机译：异质Fe3O4纳米粒子与草酸盐配合物体系光催化降解苯酚。

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摘要

A novel approach for the removal of phenol by an advanced oxidation process using Fe3O4 nanoparticles (NPs) and oxalate was proposed and investigated, and the influences of oxalate, Fe3O4 NPs and H2O2 dosage on the photodegradation of phenol were reported. No obvious difference is found between ultraviolet light and visible light exposure, confirmed potential photoactinic roles of Fe3O4 NPs in the presence of oxalate under visible light. Furthermore, relatively high dependence of oxalate depletion was observed due to the initiation of the formation of the Fe(III)-carboxylate complexes for photodegradation via a photo-Fenton-like system. Our results also demonstrated that the photodegradation of phenol occurred by a radical mechanism accompanied with the formation of O-2(center dot) and (OH)-O-center dot radicals, which was further accelerated by the exogenous addition of H2O2. All reactions followed the pseudo-first-order reaction kinetics. The half-life (t(1/2)) of Fe3O4 -oxalate and Fe3O4 -oxalate-H2O2 in the system showed higher efficiencies of photo-Fenton-like degradation routes for phenol. The photo-Fenton-like systems showed a relatively high catalytic ability (> 99.9%) in the removal of phenol at low phenol concentrations below 50 mg L-1, indicating its potential application in the treatment of low concentration wastewater. The results have demonstrated the feasibility of Fe3O4 NPs as potential heterogeneous photo-Fenton photocatalysts for organic contaminants decontamination in industrial wastewater.
机译：提出并研究了一种使用Fe3O4纳米颗粒和草酸盐进行高级氧化去除苯酚的新方法，并报道了草酸盐，Fe3O4 NPs和H2O2用量对苯酚光降解的影响。紫外光和可见光暴露之间没有发现明显差异，证实了在可见光下草酸盐存在下Fe3O4 NPs潜在的光化学作用。此外，由于通过光-Fenton-样体系进行光降解的Fe（III）-羧酸盐络合物的形成的开始，观察到草酸盐消耗的依赖性较高。我们的结果还表明，苯酚的光降解是通过自由基机理发生的，同时形成了O-2（中心点）和（OH）-O-中心点自由基，并通过外源添加H2O2进一步加速了降解。所有反应均遵循拟一级反应动力学。 Fe3O4-草酸盐和Fe3O4-草酸盐-H2O2在系统中的半衰期（t（1/2））显示较高的苯酚光芬顿类降解途径的效率。类似于光芬顿的系统在低于50 mg L-1的低酚浓度下显示出较高的催化能力（> 99.9％），可去除苯酚，表明其在处理低浓度废水中的潜在应用。结果表明，Fe3O4 NPs作为潜在的异质光芬顿光催化剂可用于工业废水中有机污染物的去污。

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