Screening tests for the evaluation of nanoparticle titania photocatalysts

Screening tests for the evaluation of nanoparticle titania photocatalysts
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纳米颗粒二氧化钛光催化剂评价的筛选试验

DOI:
10.1002/jctb.2237
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发表时间:
2009
影响因子:
3.4
通讯作者:
Thompson K
Thompson K
中科院分区:
工程技术4区
文献类型:
--
作者:
Thompson K

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背景:纳米二氧化钛具有作为光催化剂的潜力,并且掺杂的变体可能具有不同的光催化性能。采用连续热液流动合成(CHFS)技术可以制备具有多种掺杂剂和成分的纳米二氧化钛,但当制备大量样品时,需要进行大规模的筛选试验来研究其性能。采用CHFS法制备了一系列掺杂纳米二氧化钛,并采用一系列光催化测试方法对其粉末进行了研究。这些试验包括亚甲基蓝的脱色(在氧气存在下)、单质醇(丙二醇)的部分氧化和二氯乙酸水溶液的降解。考虑了这些测试在大规模筛选中的实用性,并对测试结果进行了交叉相关,以确定是否有任何测试结果对光催化剂的活性给出了相似的排名。结果:两项测试,即DCA降解和丙烯- 2 -醇,对纳米粉末的排序相似,而MB脱色结果与任何其他测试都没有很强的相关性。观察到金属掺杂剂的加入在不同掺杂剂和试验之间产生不同的结果。结论:两项试验,DCA降解和MB在可见光下脱色,被推荐作为进一步筛选试验。版权所有©2009化工学会
BACKGROUND:Nano‐sized titanium dioxide has potential as a photocatalyst, and doped variants may have different photocatalytic properties. Nano‐titanias with a wide range of dopants and compositions can be prepared using continuous hydrothermal flow synthesis (CHFS), but when many samples are made, a large‐scale screening test is required to investigate their properties. A range of doped nano‐titanias were prepared using a CHFS route, and investigated as powders using a range of photocatalytic test methods. These tests included decolourization of methylene blue (in the presence of oxygen), partial oxidation of a simple alcohol (propan‐2‐ol) and the degradation of aqueous solutions of dichloroacetic acid. The practicality of the tests for large‐scale screening was considered, and the test results were cross‐correlated to see if any of them gave similar ranking for activity of the photocatalysts.RESULTS:Two of the tests, namely DCA degradation and propan‐2‐ol, gave similar rank ordering for the nanopowders, while the MB decolourization results did not suggest a strong correlation with any other test. The addition of metal dopants was observed to produce varying results between different dopants and tests.CONCLUSIONS:Two of the tests, DCA degradation and MB decolourization in visible light, were recommended for further use as screening tests. Copyright © 2009 Society of Chemical Industry
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