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Visible-light-responsive ZnO/NiO/In 2 O 3 mixed metal oxide (ZNI-MMO) photoelectrocatalysts with different Ni/In molar ratios were derived from corresponding ternary hydrotalcite-like precursors followed by calcination at 600 °C. The as-obtained samples were characterized by XRD, TGA, BET, XPS, SEM, TEM, and UV−vis spectra techniques. The optimal molar ratio of Ni/In was found to be 1:1, where the sample (ZNI-1-MMO) was formed by the aggregation of nanospheres with an average diameter of about 50 nm and a BET specific surface area of 33.80 m 2 /g. With a 1.5 V bias potential, the ZNI-1-MMO photoelectrode exhibited high photoelectrocatalytic activity toward methylene blue (MB) degradation. The photoelectrocatalytic degradation of MB followed pseudo-first-order kinetics. Radical trapping experiments were conducted to probe the reactive species in the degradation processes. Results indicated that h + and • OH may be responsible for the efficient MB removal. The photoelectrodegradation mechanism of MB by ZNI-1-MMO-1.5 V photoelectrode was also discussed.

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With the rapid development of industry and agriculture and the greatly improved living conditions, the resultant gradually deteriorated environments threaten the human beings. Refractory or even toxic pollutants, which are from different industries such as printing and dyeing, pesticides, chemicals, petrochemicals, plastics and rubber, seriously threat the ecosystems and human health. Having the advantages of flexible composition, unique structure, high stability, memory effect, easy preparation and low cost, hydrotalcite compounds have a great potential in sewage degradation and environmental protection. This study focuses on the adsorption and catalytic properties (such as photocatalysis, electrocatalysis and photoelectrocatalysis) of hydrotalcite-derived materials for treating organic, inorganic and heavy metal ion sewage. The types of adsorption and catalysis, and the effects of various influencing factors on the degradation efficiency were discussed as well.Wiley Online Library 355 Figure 13. The photoelectrocatalytic mechanism of organic pollutant MB over the ZNI-1-MMO-1.5 V photoelectrode.

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