Adsorption Properties Of The Bis(imidazole) Ionic Liquids Loaded On Silica/SBA-15

Phenolic Compounds is an important chemical raw material that is widely used in medicine, dyes, explosives, preservatives and other productions. The use of these industrial productions can cause industrial wastewater and waste gas emission, which in turn, leads to serious pollution to the environment. SiprIm2 Cl, SiprIm2C4 Cl, SiprIm2C8 Cl, Silpr Im2ClBr- and SBA-15prIm2ClBr- are prepared by using silica gel and SBA-15 as the carrier and their absorption properties for 2,4-dinitrophenol, 2-nitrophenol and 2,4-dichlorophenol are examined. This paper is divided into five chapters.The first chapter introduces the harm and treatment methods of phenolic pollutants in environmental water, as well as the characteristics, the classification and the application of immobilized ionic liquids. In addition, the first chapter also introduces a new type of dicationic ionic liquids, and discusses its development and application in recent years.The second chapter, 1,1’-(1, 4- butanediyl) bis(imidazole), 1-(4-bromobutyl)-3-methylimidazolium bromide salts, and 1,4-bis(N-methyl imidazole) butane bromide salts are synthetized. SiprIm2 Cl, SiprIm2C4 Cl, SiprIm2C8 Cl, SilprIm2ClBr-, SBA-15prIm2ClBr- are prepared by chemical bonding. Their structures will be characterized by IR, elemental analysis, thermogravimetry, BET and other methods. In addition, the adsorbent SilprIm2NH2PF6 is prepared using physical impregnation method and characterized using IR.In the third chapter, the adsorbent SiprIm2 Cl, SiprIm2C4 Cl, SiprIm2C8 Cl are prepared by bonding N in bis(imidazole) with different lengths of alkyl chain. Then it studies this three adsorbents’ adsorption properties of 2,4- dinitrophenol and 2-nitrophenol under different pH, temperature, adsorbent dosage, solution concentration, and inorganic anion conditions. Three kinds of adsorbents on the adsorption of two kinds of phenolic compounds are different, and the 2,4- dinitrophenol adsorption capacity is significantly higher than 2- nitrophenol. The investigation of different conditions shows that the pH has a great influence on the adsorption properties, and the adsorption capacity promotes with the increase of initial concentration, but decreases with increasing amount of adsorbent added, little affected by temperature, and the addition of inorganic salt has a great effect on the adsorption of 2,4-dinitrophenol, and a little effect on the adsorption of 2-nitrophenol. The study shows that the three different adsorbents for 2,4-dinitrophenol are more in line with the Langmuir model, while the absorption of annex 2-nitrophenol follows the Freundich adsorption isotherm model more.The fourth chapter studies the adsorption properties of prepared SilprIm2ClBr-, SBA-15prIm2 ClBradsorbent on 2,4-dinitrophenol and 2,4-two chloro phenol, adsorption isotherm model under different conditions with variables such as pH values, temperature, adsorbent dosage, solution concentration, inorganic anions etc. The research shows the adsorption of 2,4-dinitrophenol of two absorbents is very high, but the adsorption of 2,4-two chloro phenol is very low. The pH values have great influence on their adsorption; the adsorption increases as the initial concentration increased; the adsorption decreases with increasing amount of adsorbent; the amount of inorganic salts have a great impact on adsorption. Time has no effect on the adsorption of SilprIm2 Cl Br-, the adsorption of SBA-15 pr Im2Cl Br- decreases with the time increasing. In the range of 20℃-50℃, the temperature has little effect on the adsorption of SilprIm2ClBr-, the adsorption of SBA-15prIm2ClBr- decreases as the temperature increases.The fifth chapter provides a summary and prospect for the study.