基于四氮唑的Cu(Ⅰ)/Cu(Ⅱ)配合物及其可见光催化降解有机污染物

Cu(Ⅰ)/Cu(Ⅱ) Complexes Based on Tetrazole Derivative: Degradation of Organic Dye under Visible Light Irradiation

利用1,2,4,5-四(2H-四氮唑)苯配体(H4TTB)和三苯基磷(PPh_3)与氰化亚铜在水热/溶剂热条件下的反应得到一价铜配合物[Cu_2(TTB)_(0.5)(PPh_3)]n(1)和二价铜配合物{[Cu(TTB)0.5(H_2O)_2]·H_2O}n(2),并通过红外光谱、热稳定性分析和X射线粉末衍射对它们进行了表征。X射线单晶结构解析表明,1中的每个TTB4-配体都有12个N原子参与配位,进而使得配合物1拥有了二维的骨架结构,而配合物2则呈现出一维双Cu^(2+)链结构。这两个配合物在可见光照射下对罗丹明B(RhB)和亚甲基蓝(MB)都表现出很好的催化降解性能:氙灯照射1 h,一价铜配合物1和二价铜配合物2对Rh B的降解率分别达到了88%和78%;而这两个配合物对MB的降解效果更好,在40 min后都达到了93%,这也说明一价铜配合物和二价铜配合物都能有效的光催化降解有机染料。

Two Cu（Ⅰ）/Cu（Ⅱ） complexes, formulated as [Cu2（TTB）0.5（PPh3）]n（1） and {[Cu（TTB）0.5（H2O）2]·H2O}n（2） （H4TTB=1,2,4,5-tetra-（2H-tetrazole-5-yl）-benzene, PPh3=triphenyl phosphine） have been obtained by solvothermal/hydrothermal reactions for the exploration of efficient photocatalytic degradation of organic dye pollutants. The two complexes were characterized by IR, TG, PXRD and X-ray single crystal determination. Complex 1 exhibits a novel 2D structure with 12 coordination atoms in a TTB4-, and complex 2 features an irregular 1D double chain structure. Moreover, under visible light, both complexes 1 and 2 display higher activation for the photocatalytic decomposition of rhodamine B （RhB） and methylene blue （MB）. The degradation efficiency can reach 88% （RhB） and 93% （MB） for 1, and 78% （RhB） and 93% （MB） for 2. Clearly, the photocatalytic degradation efficiency of complex 1 is similar to that of complex 2.