Preparation Of Poly(Ionic Liquid)-based Porous Namo-ball Materials And Application In Adsorption And Photocatalytic

Dyeing waste water is difficult to be treated because of its complicated constituents, dark chroma and strong toxicity. The adsorption and catalysis are the most conventional effective technologies of dye wastewater treatment, comparing with a variety of processing technologies. A series of polymer ionic liquids were prepared according to the application in the field of polymer material by the development of ionic liquids and technology of its synthesis, and its adsorption capacity to Congo red was investigated. Furthermore, A kind of photocatalyst PIL@TiO₂ was successfully prepared by Sol-Gel with poly（ionic liquid）（PIL） on the basis of the adsorption study. Catalytic performance of the PIL@TiO₂ to some dyes was studieded. The major results were as follows:A series of functional ionic liquid-based amino-polymer were synthesized by 1-vinylimidazole, 2-chloroethylamine hydrochloride and styrene by a simple method. To further investigate the material, the physicochemical properties of PIL were characterized by FTIR, TGA, SEM, and BET. The test results showed that the PIL materials successfully prepared and the microstructure is a kind of microporous material, and TGA analysis proved its good thermal stability. The effects of initial pH, contact time, and concentrations on the adsorption of Congo red（CR） onto PILs were investigated. It was found that the adsorption kinetic was well fitted by a pseudo-second-order model and the adsorption isotherm agreed well with the Langmuir model.Amphoteric IL-Ps materials were prepare by 1-vinylimidazole, 1, 3-propanesulfonate and styrene by above process. Then by adjusting the different ratio of amphoteric IL and styrene, the IL-Ps were obtained. The physicochemical properties of PIL were characterized some modern instruments. The analysis results proved its better physico-chemical structure: thermal stability, morphology and surface area. Adsorption experiments showed that IL-Ps for Congo red had superior adsorption performance. Adsorption kinetics, adsorption isotherm and adsorption thermodynamic calculation shows that IL-Ps, the adsorption of Congo red, followed pseudo-second-order model and Langmuir isotherm model. The adsorption process is a spontaneous endothermic reaction.A kind of composite material PIL@TiO₂ was synthesized in sol-gel method by styrene, ionic liquid（IL） and Tetrabutyl orthotitanate（TBOT） in a low temperature on the basis of above the discussion. The physico-chemical properties of PIL@TiO₂ are characterized by XRD, TGA, SEM, TEM, BET, EDS, XPS and UV-DRS. Photocatalytic measurements were conducted using a xenon lamp adjusted to 500 W with the aim of analyzing the degradation of methyl blue（MB）, methyl orange（MO） and Rhodamine B（RhB） solutions. For the photo-degradation of MB, MO and RhB, it was found that PIL@TiO₂ showed a higher photocatalytic activity to MO solutions than that to RhB solutions, three times to MB solutions. PIL@TiO₂ exhibits better photocatalytic efficiency to dye solutions after five cycle experiments. Experiments results show that the introduction of aromatic rings and –SO3- enhances the photocatalytic activity of the PIL@TiO₂ to MO solutions, but not to MB and RhB solutions, which can be explained by the special structure of MB and RhB molecules. The electron holes and ?OH play an important role in the photo-degradation.