Abstract
Photocatalytic hydrogen production from a digested sewage sludge solubilized in hot-compressed water (573K) was investigated in order to develop a low-cost sacrifice agent for CdS-based photocatalysts from biomass. H 2 evolution occurred over a LaMnO 3/CdS composite photocatalyst under Xe lamp irradiation from water containing the solubilized sewage sludge and the amount of evolved H 2 reached more than 30 mmol/ g -catalyst for a 200 h -reaction; on the other hand, no H 2 was formed in the absence of the solubilized sewage sludge. The H 2 evolution rate was comparable to that when typical Na 2S–Na 2SO 3 sacrifice agents were used, suggesting the applicability of a biomass-derived sacrifice agent for photocatalysis. Organic compounds, such as methanol and formic acid, contained in the solubilized sewage sludge are responsible for the H 2 evolution observed.
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