A novelZ-Scheme BiPO4-Bi2O2(OH)(NO3) heterojunctionstructured hybrid for synergistic photocatalysis
A novelZ-Scheme BiPO4-Bi2O2(OH)(NO3) heterojunctionstructured hybrid for synergistic photocatalysis
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一种新型Z型BiPO4-Bi2O2(OH)(NO3)异质结结构杂化物用于协同光催化
DOI：
10.1016/j.chemosphere.2016.12.102
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发表时间：
2016
期刊：
影响因子：
8.8
通讯作者：
Ren Nanqi
中科院分区：
文献类型：
--
作者：
Liu Guoshuai;You Shijie;Ren Nanqi
光催化在水处理中越来越受欢迎，它们的工程应用激发了有效光催化材料的发展。为了开发有效降解有机污染物的光催化剂，我们制备了一种新型的直接固体z型BiPO4-Bi2O2(OH)(NO3) （BPO-BHN）异质结结构杂化物。漫反射光谱（DRS）、电子自旋共振共振（ESR）、光电化学测量和理论计算结果表明，BPO-BHN对dotOH自由基的光催化活性增强。BPO-BHN对紫外光下2,4-二氯苯酚（2,4- dcp）的降解有显著促进作用。基于准一级动力学，BPO-BHN的表观降解速率常数（kapp）为0.050 min−1，分别是单个BPO （kapp= 0.015 min−1）和BHN （kapp= 0.004 min−1）的3.33和12.5倍。这表明BPO和BHN在形成直接固体z型异质结结构时具有协同光催化作用，有利于提高紫外光捕获、空穴/电子分离和氧化能力。特别是，BHN作为一种新型的非线性光学材料，由于其在价带高势C+面捕获BPO光电子的独特能力，在Z-scheme结构的形成中起着重要的作用。该研究为开发更有效的光催化剂降解水中有机污染物提供了一种概念验证策略。
Photocatalysis has been gaining a growing popularity in water treatment, and their engineered applications inspire the development of effective photocatalyst materials. To develop photocatalyst that is effective for degradation of organic pollutants, we fabricate a novel direct solid Z-scheme BiPO4-Bi2O2(OH)(NO3) (BPO-BHN) heterojunction structured hybrid. The results demonstrate an enhanced photocatalytic activity of BPO-BHN to produce radical dotOH radicals, according to diffuse reflectance spectroscopy (DRS), electron spin-resonance resonance (ESR), photoelectrochemical measurements, and theoretical calculation results. The BPO-BHN is shown to greatly promote the degradation of 2,4-dichlorophenol (2,4-DCP) under ultraviolet light. On the basis of pseudo-first-order kinetics, the apparent degradation rate constant (kapp) of 0.050 min−1obtained for BPO-BHN is approximately 3.33 and 12.5 times of that for individual BPO (kapp= 0.015 min−1) and BHN (kapp= 0.004 min−1), respectively. This suggests a virtually synergistic photocatalysis of BPO and BHN when they form a direct solid Z-scheme heterojunction structure, which is favorable for improving UV-light harvesting, hole/electron separation and oxidizing capability. In particular, as a novel non-linear optical (NLO) material, the BHN plays a significant role in the formation of Z-scheme structure for its unique ability of capturing photo-electrons from BPO by high-potential C+face in valence band. This study provides a proof-of-concept strategy to develop more effective photocatalysts for degradation of organic pollutants in water.