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Enhancement in rate of photocatalysis upon catalyst recycling

Date:
November 1, 2016
Source:
Tata Institute of Fundamental Research
Summary:
A new study examines an aspect of photocatalysis that normally does not get much recognition: recyclability.
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This is a stack plot showing the percent of degradation of Phenol vs Time for (A) TiO2 and (B) TiO2-1W for all the three cycles.
Credit: Sorathiya et al

In chemistry, in order to achieve efficiency of any chemical reaction, a catalyst is added that serves to ideally increase the rate of reaction without any deleterious effects. Specifically, a photocatalyst is one which is activated under light and can lead to improvement in rates of a variety of redox based reactions. An aspect of photocatalysis that normally does not get much recognition is recyclability. In fact, for a catalyst to be viable it must be able to withstand the reaction conditions repeatedly and the rates of reaction, upon re-using the catalysts, must not change dramatically (or at all infact).

In reality, however, most catalysts eventually undergo degradation. Presented in this work from Deepa Khushalani's group is a seminal observation where they noted an increase in rate of reaction upon recycling. The increase was 1.7 times higher in the second cycle (when compared to the first) and it was 3.1 times higher in the third cycle (again, when compared to the first). Moreover we have shown that photocatalysts can in fact undergo structural evolution and, in certain conditions, evolve to be a more effective additive for subsequent reusability. This aspect is unique since the understanding, previous to this work, was that catalysts remain unchanged during the reactions.


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Journal Reference:

  1. Kalpesh Sorathiya, Biswajit Mishra, Abhishek Kalarikkal, Kasala Prabhakar Reddy, Chinnakonda S. Gopinath, Deepa Khushalani. Enhancement in Rate of Photocatalysis Upon Catalyst Recycling. Scientific Reports, 2016; 6: 35075 DOI: 10.1038/srep35075

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Tata Institute of Fundamental Research. "Enhancement in rate of photocatalysis upon catalyst recycling." ScienceDaily. ScienceDaily, 1 November 2016. <www.sciencedaily.com/releases/2016/11/161101101014.htm>.
Tata Institute of Fundamental Research. (2016, November 1). Enhancement in rate of photocatalysis upon catalyst recycling. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2016/11/161101101014.htm
Tata Institute of Fundamental Research. "Enhancement in rate of photocatalysis upon catalyst recycling." ScienceDaily. www.sciencedaily.com/releases/2016/11/161101101014.htm (accessed May 23, 2017).

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