Supported Alkyl Imidazoleionic Liquid Absorbent For Organic Pollutants Pretreatment

As the development of green chemistry, ionic liquid has been widely used in various areas as a new type of "green solvent", and become the research hotspots in recent years. But the traditional ionic liquid is a kind of high cost "solvent", when used directly, the dosage is too large, cost too high, the phase separation is too hard for high viscosity, difficult to recovery, and easy to dissolve into the water and can cause water pollution.In this paper,we have synthesized a new type adsorbent which chloromethylation of polystyrene resin bonded on the surface of alkyl imidazole ionic liquid polymer, and apply them to the separation and enrichment of organic pollutants, study the performance of the adsorbent systematically. The adsorbent not only has the good separation and enrichment performance of the traditional ionic liquid, and solve the problems when directly using the traditional ionic liquids. The specific research contents are as follows:1we have prepared containing different alkyl surface bonding imidazole ionic liquid polymers: butyl imidazole chlorinated methyl chloride resin ([C4mim]Cl-pol), octyl imidazole chlorinated methyl chloride resin ([Csmim]Cl-pol), dodecyl imidazole chlorinated methyl chloride resin ([C12mim]Cl-pol), and cetyl imidazole chloride methyl chlorinated resin ([C16mim]Cl-pol), and the synthesis conditions are optimized.The polymers were characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy (SEM) and Thermogravimetry-differential scanning calorimetry analysis(TG-DSC). Moreover, we study selective adsorption properties and chemical stability systematically.2With Congo red, as a representative of the azobenzene anion chromophores, we study four the adsorption regularity of four polymers, and octyl imidazole chloride methyl chloride resin ([Csmim]Cl-pol) as the adsorbent, it was studied with a static adsorption method and effects of pH and initial concentration of Congo Red solution, duration of the incubation and temperature on the adsorption and oscillation condition were investigated. Under optimal conditions, we study their adsorption isotherm, adsorption capacity and adsorption kinetic. And compared with commercially available anion exchange resin, examines the adsorption effect of low concentration of Congo red solution. 32,4-dinitrophenol is the research object of phenolic anion compounds, using octyl imidazole chloride methyl chloride resin ([Csmim]Cl-pol), we study effects of the initial2,4-dinitrophenol solution pH, concentration, temperature on the adsorption, oscillation conditions. Under optimal conditions, It is studied the effect with different carbon chain of the adsorbent for the adsorption of2,4-dinitrophenol solution, adsorption isotherm and kinetics of adsorption performance. And the adsorpting effect of a low concentration which2,4-dinitrophenol solution is comparisoned and analysised with that of commercially available anion exchange resin. In addition, the dynamic adsorption is studied, the parameters of the micro separation column, that the influence of the eluent, sampling flow rate, elution curve, binding capacity of the column, concentration ratio, were investigated. Moreover, we study the regenerate and recycled.4The research results and conclusions of this paper are summarized, and the selective adsorption mechanism of new adsorbents is predicted. The problems that need to be solved in the further are proposed, as well as the assumptions and suggestions for future research work.