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T. Phongamwong, W. Donphai, P. Prasitchoke, Ch. Rameshan, N. Barrabés-Rabanal, W. Klysubun, G. Rupprechter, M. Chareonpanich:
"Novel visible-light-sensitized Chl-Mg/P25 catalysts for photocatalyticdegradation of rhodamine B";
Applied Catalysis B: Environmental, 207 (2017), 326 - 334.

Photocatalytic reaction is known as one of the most promising processes to reduce global warming andenvironmental problems as well as offer sustainable energy sources. As nano-bio hybrid materials arepotential alternatives for improving the efficiency of photocatalytic reactions, a unique chlorophyll andMg co-modified P25 (Degussa P25, which consists of mixed phases between anatase and rutile) catalystwas synthesized and used as a visible light reactive photocatalyst in this research. The activity of obtainedcatalysts was evaluated from photocatalytic degradation of rhodamine B (RhB) under visible light, andthe effect of chlorophyll source, co-modified chlorophyll and magnesium, and their loading amounts onphotodegradation of RhB were investigated. It was found that the loading of extracted chlorophyll gavehigher activity than that of Spirulina due to its greater possibility for direct contact between chlorophylland P25, leading to more efficient electron transfer from chlorophyll to P25. In addition, loading freeMg together with chlorophyll led to the formation of a new complex structure, resulting in synergisticeffect between chlorophyll-Mg and P25, and therefore an increase in photocatalytic performance andgood reusability of catalysts. Proper amounts of chlorophyll and Mg loading on P25 (0.5Chl-0.1Mg/P25)could promote the photocatalytic activities such that they are approximately 2.3, 1.3 and 2.1 times thoseof P25, 0.5Chl/P25 and 0.1Mg/P25, respectively.

Chlorophyll Mg/P25 Spirulina RhB degradation Visible light

http://dx.doi.org/10.1016/j.apcatb.2017.02.042