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The importance of potable water is immeasurable and its contamination by pollutants is a serious environmental problem. Rhodamine B (RhB), one such pollutant, is highly toxic to various organisms and may cause longterm undesirable effects when improperly disposed of. Thus, development of an efficient treatment technique is necessary. Among the new oxidation methods, heterogeneous photocatalysis is an emerging pollutant destructive technology.

The photocatalytic activities of copper (Cu) and zinc (Zn) aluminate spinels (CuAl₂O₄ and ZnAl₂O₄) was evaluated. Chemical and physical properties were considered, and ZnAl₂O₄ showed higher RhB degradation efficiency (73.90% in only 10 min) than CuAl₂O₄ (51.95% in 10 min), reaching up to 100% in 30 min. According to results, a further RhB catalytic degradation pathway by ZnAl₂O₄ was monitored by UVvisible …