Porous polyvinylidene fluoride (PVDF) membrane was successfully fabricated via phase inversion method. The surface and cross⁃section morphologies, and thermal stability of the samples were characterized by scanning electron microscopy and thermogravimetry⁃differential thermal analyzer. The adsorption property of PVDF membrane for Congo Red was investigated. The results showed that the most proper dosage of PVDF membrane is 30 mg. The maximum adsorption capacity of PVDF membrane for Congo Red is 64.6 mg/g at 303 K. The isotherm data followed the Freundlich isotherm model and the kinetic adsorption obeyed the pseudo⁃second⁃order model. Thermodynamic parameters illustrated that the adsorption process was spontaneous and endothermic. Ethanol has good desorption effect on PVDF membrane adsorbed by Congo red. After 8 adsorption⁃desorption, PVDF membrane still maintains high adsorption capacity for Congo red.

Nowadays, the increasingly serious phenomenon of water pollution and the gradual shortage of water resources have been addressed more attentions all over the world. Developing effective catalyst for the degradation of organic pollutants in the water by using solar energy is one of the hot research topic currently. In this paper, the photocatalytic degradation of organic dye rhodamine B under visible light irradiation was studied by using metal coordination compounds as photocatalyst. The results show that the degradation rate of rhodamine B by Co(en) ₃Cl ₃ reach 87%, the degradation rate of rhodamine B by Ni(en) ₃Cl ₂ reach 2%, the degradation rate of rhodamine B by Ni(dien) ₂Cl ₂ reach 2%, under the condition of rhodamine B aqueous solution ((1×10 ^-5mol/L) 80 mL, catalyst dosage 0.02 g, reaction temperature 25 ℃, 300 W visible light irradiation for 120 min. Thus, Co(en) ₃Cl ₃ is a good photocatalyst.