Regulating the relative content of O2− and OH for PCPNa degradation on BiOCl plates with controllable exposed crystal faces and surface oxygen vacancies
Regulating the relative content of O2− and OH for PCPNa degradation on BiOCl plates with controllable exposed crystal faces and surface oxygen vacancies
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DOI：
10.1016/j.seppur.2019.115743
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发表时间：
2019-12
影响因子：
8.6
通讯作者：
Suxiang Ge;Dapeng Li;Z. Cui;Ya-kui Zhang;Sen Zhang;Tianyi Zhang;G. Jia;Weiwei He;Zhi Zheng
中科院分区：
文献类型：
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作者：
Suxiang Ge;Dapeng Li;Z. Cui;Ya-kui Zhang;Sen Zhang;Tianyi Zhang;G. Jia;Weiwei He;Zhi Zheng
许多活性物种（h+、e−、dotO2−、dotOH等）参与五氯苯酚钠（PCPNa）的降解，因此难以测量其各自的贡献。最近，人们发现BiOCl的（0 0 1）和（0 1 0）晶面上的氧空位在可见光下优先激活氧分子，分别产生可测量的dotO2−和dotOH自由基.在这项研究中，我们成功地调节相对含量的radical dotO2−和radical dotOH通过激活分子氧BiOCl板与可调的（0 0 1）和（0 1 0）方面和可调的表面氧空位在其表面上。通过系统比较BiOCl片的光催化活性以及不同BiOCl体系中自由基dotO2−和自由基dotOH的相对含量，发现是自由基dotO2−的增加而不是自由基dotOH与自由基dotO2−摩尔比的改变对提高PCPNa的降解速率起了决定性作用。该研究为评价自由dotO2−和自由dotOH在PCPNa降解中的贡献提供了新的思路，对设计高效光催化剂具有一定的实用价值.
Many active species (h+, e−,radical dotO2−,radical dotOH and so on) participate in pentachlorophenol sodium (PCPNa) degradation and make their respective contribution difficult to measure. Very recently, it is found oxygen vacancies on (0 0 1) and (0 1 0) facets of BiOCl preferred to activate molecular oxygen to produce measurableradical dotO2−andradical dotOH radicals under visible light, respectively. In this study, we successfully regulated the relative contents ofradical dotO2−andradical dotOH by activating molecular oxygen on BiOCl plates with the adjustable (0 0 1) and (0 1 0) facets and tunable surface oxygen vacancies on their surfaces. By systematically comparing the photocatalytic activity of BiOCl plates and the relative contents ofradical dotO2−andradical dotOH in different BiOCl systems, we found that it is the increase ofradical dotO2−rather than the change of the molar ratio ofradical dotOH toradical dotO2−play a crucial role in enhancing the degradation rate of PCPNa. This study provide a new insight on evaluating the contributions ofradical dotO2−andradical dotOH in PCPNa degradation and be practical for designing the high efficient photocatalysts.