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首页> 外文期刊>RSC Advances >Synthesis and characterization of Mn/Co/Ti LDH and its utilization as a photocatalyst in visible light assisted degradation of aqueous Rhodamine B
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Synthesis and characterization of Mn/Co/Ti LDH and its utilization as a photocatalyst in visible light assisted degradation of aqueous Rhodamine B

机译：Mn / Co / Ti LDH的合成与表征及其在罗丹明水溶液中可见光辅助降解中的光催化剂的利用

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摘要

Luminescent Mn/Co/Ti LDH, synthesized by a single step hydrothermal route, has been found to be optically responsive for utilization as a highly efficient photocatalyst in destruction of the cationic dye Rhodamine B, in aqueous solution under visible light irradiation. The material has been found to be better than the commercial catalysts like MnO, CoO, TiO2 and Degussa P25. Multiple techniques like XRD, XPS, FT-IR, EIS, TG, UV-visible DRS, PL, TRES, N-2-sorption-desorption, dynamic light scattering, TEM-EDS and AFM analyses were used to characterize the LDH. The results indicated Mn/Co/Ti LDH to have a multilayered crystalline structure with hexagonal morphology that carries metal ions in mixed valences, oxygen vacancies, defect states, thermal stability, narrow band gap, high surface area, and electrostatic surface charge variation with pH. The photocatalytic activity of the LDH could be co-related with the structural aspects such as oxidation states, narrow band gap, high surface area and existence of defects. The active species responsible for photocatalysis have been evaluated with EPR, terephthalic acid fluorescence probe and indirect radical-hole trapping experiments. The photodegradation mechanism involves electron and hole hopping across the material and also photosensitization of the dye. Ex situ H-1-NMR and GC-MS analyses of the colorless end products of Rhodamine B destruction provide further insight into the reaction mechanism. The complete mineralization of the decolorized end product of degradation was evaluated with TOC analysis. The results indicate the potential for using multi metal incorporated LDH in destroying dyes and their degradation products in industrial wastewater.
机译：已经发现由单步水热路线合成的发光Mn / Co / Ti LDH，用于光学响应于在可见光照射下的水溶液中破坏阳离子染料罗丹明B的高效光催化剂。已发现该材料比商业催化剂更好，如MNO，COO，TiO2和Degussa P25。使用多种技术，如XRD，XPS，FT-IR，EIS，TG，UV可见DRS，PL，TRE，N-2吸附 - 解吸，动态光散射，TEM-EDS和AFM分析，用于表征LDH。结果表明，Mn / Co / Ti LDH具有多层晶体结构，具有六边形形态的六边形形态，其携带混合性的金属离子，氧空位，缺陷状态，热稳定性，窄带隙，高表面积和静电表面电荷变化与pH值。 LDH的光催化活性可能与氧化态，窄带隙，高表面积和缺陷存在的结构方面共同有关。用EPR，对苯二甲酸荧光探针和间接自由基捕获实验评估负责光催化的活性物质。光降解机制涉及电子和空穴跳过材料，也是染料的光敏。 EX原位H-1-NMR和罗丹明B破坏的无色终端产物的GC-MS分析提供了进一步了解反应机制的洞察力。通过TOC分析评价脱色最终产物的完全矿化。结果表明在工业废水中破坏染料及其降解产物的使用多金属掺入LDH的可能性。

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