Cu-有机骨架对染料废水的吸附和可见光降解

Adsorption and visible-light photodegradation of Cu-organic framework to dye wastewater

为清除印染废水中的有机染料,采用Cu(NO_3)_2与2,6-二(4-羧基苯)-4-(三氟甲氧基)苯胺反应,合成了多孔的半导体型Cu-有机骨架材料(Cu-MOF),对废水中的有机染料进行物理吸附和光催化降解。结果表明,10 mg的Cu-MOF对20 mL质量浓度为48.95 mg/L的阳离子艳红5GN的吸附效率高达98.88%,吸附速率为9.73×10^(-3)mg/(g·min),其对不同尺寸的染料具有选择性吸附能力;在可见光照射下,5 mg的Cu-MOF在11 h内对40 mL质量浓度为35.81 mg/L的活性翠蓝KN-G的可见光降解效率为79.78%,光催化速率系数为0.14 h^(-1),最佳应用pH值为8;经5次连续的光催化循环测试,其对活性翠蓝KN-G的光降解效率仍高达71.03%。

In order to eliminate organic dyes from printing and dyeing wastewater, Cu（NO3 ）2 and 2,6- bis （4-carboxylphenyl）-4-（trifluoromethoxy） benzenamine were executed to synthesize a porous semiconductor type Cu-organic framework material Cu-MOF, which was employed to adsorb and photocatalytically degrade organic dyes in water. The experimental results demonstrate that the adsorption efficiency and adsorption rate constant for 10 mg towards cationic brilliant red 5GN （20 mL and 48.95 mg/L） are 98.88% and 9.73 × 10-3mg/（g min） , respectively. And it could selectively adsorb dyes with different sizes. Under the irradiation of visible light, Cu-MOF （5 mg） could decompose reactive turquoise blue KN-G （40 mL and 35.81 mg/L） , with the visible light degradation efficiency and photocatalytic rate constant of 79.78% and 0. 14 h-I, respectively, within 11h. The optimal applied pH value of the Cu-MOF is determined to be 8. After five consecutive photocatalytic recycle tests, the photocatalytic degradation efficiency of Cu-MOF towards reactive turquoise blue KN-G is still up to 71.03%, indicating dual-functional characteristic of the material for physical adsorption and photocatalytic degradation of organic dyes in water.