Synthesis of a 3D Cu(II) MOF and its heterostructual g-C3N4 composite showing improved visible-light-driven photodegradation of organic dyes

One 3D Cu(II)-based metal-organic framework {[Cu3(tmpa)2(1,2,3-btc)2(H2O)2].14H2O.2DMF}n (Cu(tmpa)) (tmpa ​= ​tris(4-(2-methyl-1H-imidazole-1-yl)phenyl)amine, 1,2,3-H3btc ​1,2,3-benzenetricarboxylic acid) was prepared by hydrothermal method and characterized. Cu(tmpa) exhibits (3,3,4)-connected topology showing point symbol of (6·8·9)2(6·8·10)2(62·82·102). The heterostructural Cu(tmpa)/CN composites with different mass proportions were characterized XRD, FT-IR, SEM, EDS, UV-DRS, TGA, PL EIS. photocatalytic activities Cu(tmpa)/20%CN composite to degrade methylene blue (MB), methyl violet (MV), malachite green (MG), Congo red (CR) investigated. degradation MB studied, the catalytic conditions catalyst dosage, H2O2 concentration initial pH value optimized. rate for could reach 92.0% within 20 ​min. also 92.0%, 92.9% 98.2% MV, MG CR in 60 ​min, 35 ​min 3 respectively. mechanisms studied. enhanced might be attributed not only vigorous visible-light absorption Cu(tmpa), but heterojunction formed doping g-C3N4, which accelerates divorce movement photogenerated charges compared Cu(tmpa). holes primary active matters MB. superoxide radicals main reactive CR. are good materials.