Abstract:

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 9.73×10-3 mg/(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-1, respectively, within 11 h. 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.

Key words: Cu-organic framework material, dye wastewater, physical adsorption, photodegradation