可见光驱动的PbCrO4纳米棒降解微囊藻毒素-LR的机理。,Chemosphere

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可见光驱动的PbCrO4纳米棒降解微囊藻毒素-LR的机理。
Chemosphere ( IF 8.1 ) Pub Date : 2019-09-10 , DOI: 10.1016/j.chemosphere.2019.124739
Guoshuai Liu ₁ , Guoqiang Zhang ₂ , Shuo Zhang ₃ , Yangsen Xu ₄ , Xun Yang ₅ , Xuedong Zhang ₃

Affiliation

这项工作的重点是在水处理中光催化去除顽固性有机污染物。基于容易的沉淀反应，我们在单晶中制备了对可见光具有明显响应的光催化剂（PbCrO4），并在微囊藻毒素-LR（MC-LR）的光催化分解中使用了该催化剂。在使用具有制备的PbCrO4光催化剂的纳米棒进行的降解测试中，获得了100％的去除效率（27分钟反应）和0.1356 min-1的动力学常数。PbCrO4在MC-LR的光催化转化中具有如此高的性能归因于其高的载流子分离效率，正价带（VB）位置以及VB和导带（CB）的良好离域作用。电子自旋共振（ESR）测试表明，在MC-LR的PbCrO4光催化过程中会产生过量的游离OH自由基。密度泛函理论（DFT）和LC / MS / MS技术用于确定在MC-LR光催化降解过程中的中间体。主要中间体是由羟基自由基攻击MC-LR结构的ADDA侧链产生的。这项研究提供了一种概念验证策略，可开发有效的光催化剂，以有效地产生OH自由基，用于可见光诱导的水中MC-LR的光催化降解。主要中间体是由羟基自由基攻击MC-LR结构的ADDA侧链产生的。这项研究提供了一种概念验证策略，可开发有效的光催化剂，以有效地产生OH自由基，用于可见光诱导的水中MC-LR的光催化降解。主要中间体是由羟基自由基攻击MC-LR结构的ADDA侧链产生的。这项研究提供了一种概念验证策略，可开发有效的光催化剂，以有效地产生OH自由基，用于可见光诱导的水中MC-LR的光催化降解。

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Degradation and mechanism of microcystin-LR by PbCrO4 nanorods driven by visible light.

This work focuses on the photocatalytic removal of recalcitrant organic pollutants in water treatment. Based on facile precipitation reaction, we fabricated a photocatalyst (PbCrO4) in single crystals that present evident response to visible light and employed the catalyst in the photocatalytic decomposition of microcystin-LR (MC-LR). In the degradation test using the nanorods with prepared PbCrO4 photocatalyst, a 100% removal efficiency (27 min reaction) and a kinetics constant of 0.1356 min-1 were achieved. Such a high performance of PbCrO4 in photocatalytic conversion of MC-LR was ascribed to its high carrier separation efficiency, positive valence band (VB) position, and good delocalization of VB and conduction band (CB). The test of electron spin-resonance resonance (ESR) demonstrated that excessive free OH radicals were produced during the PbCrO4 photocatalysis of MC-LR. The density functional theory (DFT) and LC/MS/MS technology were employed to ascertain the intermediates during the MC-LR photocatalytic degradation. The major intermediates were resulted from the attack of hydroxyl radicals to the ADDA side chains of MC-LR structure. This study provides a proof-of-concept strategy to develop effective photocatalysts to efficiently produce OH radicals for the visible-light induced photocatalytic degradation of MC-LR in water.

更新日期：2019-09-10

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