Photocatalytic decomposition of dangerous organic contaminants using irradiation with sunlight is of great importance for environmental remediation and human health. In this paper Zn²⁺Me³⁺ (Me = Al/Ga) layered double hydroxides (LDHs) doped with gallium oxide (Ga₂O₃) and indium oxide (In₂O₃) and their derived mixtures of mixed oxides (MMOs) as novel solar light driven photocatalysts for degrading a mixture of phenol/4-nitrophenol (Ph–4NPh) are presented. The Ga₂O₃/ZnMeLDHs and In₂O₃/ZnMeLDHs were fabricated by exploiting the LDH capability to rebuild its structure, after being destroyed by calcination at 550 °C, in aqueous solutions of gallium sulfate [Ga₂(SO₄)₃] and indium acetate [In(C₂H₃O₂)₃], respectively, while the corresponding MMOs were obtained after the calcination at 750 °C. The effects on the structure, surface characteristics and photo-absorption properties of the catalysts were assessed using X-ray diffraction, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and ultraviolet-visible analyses. The findings demonstrate that both Ph and 4NPh are degraded by both the reconstructed LDHs and their derived MMOs in such a way that an increased efficiency is obtained for In/Zn3Ga_750 and Ga/Zn3Ga_750 which degraded almost 90% of the 4NPh. In comparison, for In/Zn3Ga and Ga/Zn3Ga catalysts, the degradation efficiency reached only 69% and 47%, respectively. Furthermore, in the family of ZnAlLDH derived catalysts, In/Zn3Al_750 is able to decompose 98% of 4-NPh and 77% of Ph, after 240 min of irradiation, whereas the efficiency of Ga/Zn3Al_750 reached only 57% for 4-NPh and 39% for Ph. The as-prepared LDHs, Zn3Al and Zn3Ga, are almost inactive for degradation of a Ph–4NPh mixture under solar light.

中文翻译：

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使用掺杂有Ga ₂ O ₃和In ₂ O _3的Zn ²⁺ Me ³⁺（Me = Al / Ga）LDH及其衍生的混合氧化物获得的一系列太阳光响应光催化剂：苯酚/ 4-硝基苯酚分解的案例研究

使用阳光照射对危险有机污染物进行光催化分解对于环境修复和人体健康至关重要。本文研究了掺杂有氧化镓（Ga ₂ O ₃）和氧化铟（In ₂ O ₃）的Zn ²⁺ Me ³⁺（Me = Al / Ga）层状双氢氧化物（LDHs）及其衍生的混合氧化物混合物（MMOs） ）作为新型的光催化降解苯酚/ 4-硝基苯酚（Ph-4NPh）混合物的光催化剂。Ga ₂ O ₃ / ZnMeLDHs和In ₂ O ₃/ ZnMeLDHs通过利用LDH在550℃的煅烧条件下被破坏后在硫酸镓[Ga ₂（SO ₄）₃ ]和乙酸铟[In（C ₂ H ₃ O ）的水溶液中被破坏的能力来重建其结构而制造。₂）₃，分别在750°C下煅烧后获得相应的MMO。使用X射线衍射，能量色散X射线光谱，X射线光电子能谱，傅立叶变换红外光谱和紫外可见分析来评估对催化剂的结构，表面特性和光吸收性能的影响。研究结果表明，Ph和4NPh均被重构的LDH及其衍生的MMO降解，从而In / Zn3Ga_750和Ga / Zn3Ga_750的效率提高，而In / Zn3Ga_750和Ga / Zn3Ga_750几乎降解了4NPh的90％。相比之下，对于In / Zn3Ga和Ga / Zn3Ga催化剂，其降解效率分别仅为69％和47％。此外，在ZnAlLDH衍生的催化剂家族中，In / Zn3Al_750能够分解98％的4-NPh和77％的Ph，