Mn/Co/Ti LDH 的合成和表征及其作为光催化剂在可见光辅助降解水性罗丹明 B 中的应用。,RSC Advances

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Mn/Co/Ti LDH 的合成和表征及其作为光催化剂在可见光辅助降解水性罗丹明 B 中的应用。
RSC Advances ( IF 3.9 ) Pub Date : 2016-11-21 00:00:00 , DOI: 10.1039/c6ra24288j
Priyadarshi Roy Chowdhury ₁ , Krishna G Bhattacharyya ₁

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通过一步水热途径合成的发光 Mn/Co/Ti LDH 具有光学响应性，可用作高效光催化剂，在可见光照射下破坏水溶液中的阳离子染料罗丹明 B。该材料已被发现比 MnO、CoO、TiO ₂和 Degussa P25 等商业催化剂更好。使用 XRD、XPS、FT-IR、EIS、TG、紫外-可见 DRS、PL、TRES、N 2 吸_脱附、动态光散射、TEM-EDS 和 AFM 分析等多种技术来表征 LDH。结果表明，Mn/Co/Ti LDH 具有六方形貌的多层晶体结构，可携带混合价金属离子、氧空位、缺陷态、热稳定性、窄带隙、高表面积以及静电表面电荷随 pH 的变化。LDH的光催化活性可能与氧化态、窄带隙、高表面积和缺陷的存在等结构方面相关。通过 EPR、对苯二甲酸荧光探针和间接自由基空穴捕获实验对负责光催化的活性物质进行了评估。光降解机制涉及电子和空穴在材料上的跳跃以及染料的光敏化。对罗丹明 B 破坏的无色最终产物进行异位 ¹ H-NMR 和 GC-MS 分析，进一步深入了解反应机理。通过 TOC 分析评估降解的脱色最终产物的完全矿化。结果表明，使用多金属掺入的 LDH 来破坏工业废水中的染料及其降解产物具有潜力。

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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.

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, N₂-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 ¹H-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.

更新日期：2016-11-21

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