Cu-有机骨架对水中染料的吸附和光降解

Adsorption and photodegradation towards dyes from water by Cu-organic framework

为修复被含染料废水污染的水环境,采用Cu(NO3)2与—NH2、—OCF3修饰的有机配体(H2L)在溶剂热条件下反应,制备了多孔Cu-有机骨架(Cu-MOF)材料,对水中的染料分子进行了物理吸附和光化学降解。结果表明,Cu-MOF不仅可以高效吸附单一染料溶液中的MB、BR14和BY24,还可以同步吸附双染料混合溶液中的MB+MO、MB+RhB、MB+RR24,在MB+RY2混合溶液中可以选择性捕获MB。在由MB、MB+MO和MB+RhB组成的染料体系中,Cu-MOF对MB的光催化降解效率分别达到了99.2%,98.45%和98.32%,对应的降解速率常数分别为3.3×10-2,9.03×10^-2和2.0×10^-2min^-1;对MO和RhB的降解效率分别为40.47%和97.16%,对RhB的降解速率常数为2.1×10^-2min^-1。

In order to achieve the remediation of water environment polluted by dyes-containing wastewater, Cu(NO 3) 2 and organic ligands (H 2L) which modified by -NH 2 and -OCF 3were employed to synthesize porous Cu-organic framework (Cu-MOF) materials under solvothermal reaction for eliminating dye molecules from water by physical adsorption and photochemically degradation.The results show that Cu-MOF can not only efficiently adsorb MB, BR14 and BY24 from single dye containing solution, but also simultaneously adsorb MB+MO, MB+RhB, MB+RR24 in double dyes containing mixed solution, and can selectively capture MB from MB+RY2 mixed solution.For dye solutions containing MB, MB+MO and MB+RhB, the degradation efficiencies of Cu-MOF towards MB reached 99.2%, 98.45% and 98.32%, respectively, the corresponding degradation rate constants were determined as 3.3×10^-2 min^-1 , 9.03×10^-2 min ^-1 and 2.0×10 ^-2 min^-1 .The degradation efficiencies towards MO and RhB were 40.47% and 97.16%, respectively, and the degradation rate constant of RhB was 2.1×10^-2 min^-1 .