Semiconductor photocatalytic reduction is a relatively new technique for the removal of dissolved metal ions in wastewater. In this paper, physical adsorption and photocatalytic reduction of eight environmentally signi"cant metal ions in TiO suspensions of Degussa P25 and Hombikat UV100 were investigated. Critical scrutiny of the potential versus pC and pH diagrams reveals that any particular oxidation or reduction reaction can be promoted thermodynamically over other reactions by adding di!erent reactants. In order to elucidate better understanding of the kinetics of the photocatalytic process, operating parameters such as dissolved oxygen, presence of ferric and ferrous ions, organic reductants and their concentrations were examined in detail. It was observed that the presence of dissolved oxygen inhibits while the presence of organic reductants promotes photocatalytic reduction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.