Photocatalytic OH radical formation and quantification over TiO2 P25: Producing a robust and optimised screening method
Photocatalytic OH radical formation and quantification over TiO2 P25: Producing a robust and optimised screening method
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DOI：
10.1016/j.cclet.2018.04.022
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发表时间：
2018-06-01
影响因子：
9.1
通讯作者：
Robertson, Peter K. J.
中科院分区：
文献类型：
--
作者：
Buck, Caitlin;Skillen, Nathan;Robertson, Peter K. J.
自首次报告以来，光催化技术的发展取得了显著的进展，因此，已经开发了一些筛选方法来评估活性。在环境修复领域，一个关键因素是形成高氧化性物种，如OH自由基。这些自由基往往是去除和分解有机和无机污染物的主要驱动力。由于自由基的性质，这类化合物的定量是具有挑战性的，然而，使用化学探针基本上捕获自由基的间接方法已被证明是有效的。正如在这里提出的工作中所讨论的，这种方法的优化是该方法的效率的基础。香豆素起始浓度范围为50mMol/L~1000mmoL/L，催化剂装载量为0.01g/L~1g/L时，确定最佳生产条件为250mmoL/L和0.5g/L。在此参数下，获得了35.91mU/L(R-max=0.4mU/L)的最大产率，在紫外光照射下的光子效率为4.88mU/mol·m-1。提供的数据集还突出了与该方法相关的限制，包括：探针分子的快速耗尽和通过紫外光饱和进行的过程抑制。确定工艺的最佳条件和潜在限制是有效应用光催化筛选方法的关键。(三)2018中国化学学会、中国医学科学院药物所。爱思唯尔出版，版权所有。
The development of photocatalytic technology has grown significantly since its initial report and as such, a number of screening methods have been developed to assess activity. In the field of environmental remediation, a crucial factor is the formation of highly oxidising species such as OH radicals. These radicals are often the primary driving force for the removal and breakdown of organic and inorganic contaminants. The quantification of such compounds is challenging due to the nature of the radical, however indirect methods which deploy a chemical probe to essentially capture the radical have been shown to be effective. As discussed in the work presented here, optimisation of such a method is fundamental to the efficiency of the method. A starting concentration range of coumarin from 50 mu mol/L to 1000 mu mol/L was used along with a catalyst loading of 0.01 g/L to 1 g/L TiO2 to identify that 250 mu mol/L and 0.5 g/L TiO2 were the optimum conditions for production. Under these parameters a maximum production rate of 35.91 mu mol/L (R-max = 0.4 mu mol/L OH center dot min(-1)) was achieved which yielded at photonic efficiency of 4.88 OH center dot moles photon(-1) under UV irradiation. The data set presented also highlighted the limitations which are associated with the method which included; rapid exhaustion of the probe molecule and process inhibition through UV light saturation. Identifying both the optimum conditions and the potential limitations of the process were concluded to be key for the efficient deployment of the photocatalytic screening method. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.