摘要
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。
Transition metal ions doping Zn3（OH）2V2O7·2H2O with micro flowerlike morphologies were successfully synthesized by a surfactant-free hydrothermal method, which formula can be presented as Zn3-3xM3x（OH）2V2O7·2H2O （M=Cu, Co, Ni, Mn;0.001≤x≤0.20）. The as-prepared micro flowerlike structures were characterized by means of XRD, SEM, TEM, UV-Vis DRS, EDX and BET techniques. The results of structure and morphology analysis showed that 3d transition metal ions doped samples remained Zn3（OH）2V2O7·2H2O hexagonal structure, and the micro flowerlike structures were assembly of 2D nanosheets with （0001） main crystal facets. In UV-Vis DRS test, the spectra of as-prepared doping samples displayed red-shifts in the band-edge, and the red-shift value of Cu2＋ doped sample was largest. It was the first time undoping and transition metal ions doping Zn3（OH）2V2O7·2H2O were used as the photocatalysts for organic pollutant degradation under visible light irradiation. It was found that 0.1at% Cu doped sample Zn3-3xM3x（OH）2V2O7·2H2O exhibited the highest photocatalytic activity for visible degradation of methylene blue （MB） among the doping and undoping analogues. Moreover, the influence facts including type and doping concentration of transition metal ions on the visible-light-driven photocatalytic activity of Zn3（OH）2V2O7·2H2O were also investigated.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2012年第10期2170-2178,共9页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21073145)
国家重点研究发展计划(No.2011CBA00508)资助项目
