Photocatalytic oxidation of roxarsone using riboflavin-derivative as a photosensitizer

Add time:08/14/2019    Source:sciencedirect.com

Roxarsone (ROX) is a typical organoarsenic feed additive, and most of ROX is excreted unchanged in manure and wastewater. The stability and mobility of ROX result in the environmental risk of arsenic contamination spreading. The degradation of ROX to arsenate (As(V)) can reduce the mobility and environmental risk. Riboflavin is a photosensitizer and can catalyze ROX to As(V), but it is not stable in water environment. In this study, riboflavin-derivative 2′,3′,4′,5′-tetraacetylriboflavin (RTA) was used to replace riboflavin as photosensitizer. The possibility of ROX photodegradation using riboflavin-derivative (RTA) as photosensitizer was investigated. The results showed that RTA was more stable than riboflavin in water environment. ROX was degraded to arsenite (As(III)) by RTA in 90 min under simulated sunlight irradiation and 50 min under natural sunlight irradiation, and further to As(V). The degradation was inhibited under acidic or alkaline pH conditions, while was favorable under neutral pH conditions. The mechanisms of ROX degradation by RTA were further explored. 1O2, O2− and excited RTA played important role in the RTA-sensitized ROX photodegradation. The photocatalytic degradation of roxarsone by RTA can reduce mobility of arsenic and the environmental risk caused by organoarsenicals.

We also recommend Trading Suppliers and Manufacturers of riboflavin 5'-sulfate (cas 1107-62-6). Pls Click Website Link as below: cas 1107-62-6 suppliers

Prev:Original ArticleSynthesis of highly fluorescent carbon dots from lemon and onion juices for determination of riboflavin in multivitamin/mineral supplements
Next:Oxidation of cystatin imparted by riboflavin generated free radicals: Spectral analysis)