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利用水热法合成了3d过渡金属离子掺杂Zn3(OH)2V2O7·2H2O的微米花结构,其分子式可表达为Zn3-3xM3x(OH)2V2O7·2H2O(其中M=Cu,Co,Ni,Mn;0.001≤x≤0.20)。应用XRD、SEM、TEM、UV-Vis DRS、EDX和BET等分析测试技术对产物进行了表征。结构和形貌分析结果显示过渡金属离子掺杂后产物仍保持Zn3(OH)2V2O7·2H2O的六方晶体结构,微米花由主晶面为(0001)的纳米片组装而成。紫外-可见漫反射光谱显示过渡金属离子掺杂后带边吸收红移,其中以Cu的掺杂产物Zn3-3xCu3x(OH)2V2O7·2H2O最为明显,带边吸收扩展到可见光区。首次对Zn3(OH)2V2O7·2H2O及其不同金属离子掺杂产物Zn3-3xM3x(OH)2V2O7·2H2O进行了可见光催化降解有机污染物的研究,结果显示与其它产物相比掺0.1at%Cu的Zn2.997Cu0.003(OH)2V2O7·2H2O对亚甲基蓝(MB)的可见光催化降解效果最好。对掺杂离子种类、掺杂离子浓度对产物可见光催化性质的影响也进行了考察。
The microstructure of 3d-doped transition metal ion doped Zn3 (OH) 2V2O7 · 2H2O was synthesized by hydrothermal method. The molecular formula can be expressed as Zn3-3xM3x (OH) 2V2O7 · 2H2O (M = Cu, Co, Ni, Mn, 0.001 ≦ x ≦ 0.20). The products were characterized by XRD, SEM, TEM, UV-Vis DRS, EDX and BET. The results of the structure and morphology analysis show that the transition metal ions are doped with the hexagonal crystal structure of Zn3 (OH) 2V2O7 · 2H2O. The micron flower is assembled from the (0001) nanosheet. UV-visible diffuse reflectance spectra show that the band edge absorbs red-shift after the transition metal ions are doped, of which the Cu3 + doping product Zn3-3xCu3x (OH) 2V2O7.2H2O is most obvious, and the band edge absorption extends to the visible region. The first study on the photocatalytic degradation of organic pollutants by Zn3-3xM3x (OH) 2V2O7 · 2H2O and Zn3 (OH) 2V2O7 · 2H2O with different metal ions was carried out. The results showed that 0.1at% Cu Zn2.997Cu0.003 (OH) 2V2O7 · 2H2O has the best photocatalytic activity on methylene blue (MB). The influence of doping ion species and doping ion concentration on the visible light photocatalytic properties of the product was also investigated.