Organic, Inorganic Preparation Of Modified Bentonite And Its Application In Wastewater Treatment Research

Based on the review about the application of anion-cation organobentonites inwastewater treatment. We mixed different preparation of CTMAB and SDS to thebentonite, prepared series of anion-cation organobentonites, and studied its charactisticsand mechanisms of adsorption of Phenol and Aniline in water, also researched rare earthmodified bentonite for Phosphorus in wastewater treatment. The results showed theorganic carbon content of anion-cation organobentonites was higher than the naturalbentonite. The best ratio of anion-cation organobentonite to adsorb Phenol was140CTMAB/10SDS,and the best absorption conditions: The concentration of Phenolwastewater was 50mg/L,adjusted the pH value to 6,the amount of anion-cationorganobentonite was 0.8g,adsorption for 60min,the highest removal efficiency was77.21％.The isotherms of phenol indicated, under the normal temperature, the highestamount of adsorption is 23.5849mg/g,and it was fitted well to the Langmuir ModelSorption The surface adsorption and the assignment function mechanism indicated thatthe modified absorbent to the phenol was primarily by the surface adsorption. Theorthogonal experiment showed that the best ratio of anion-cation organobentonite toadsorb Aniline was 70CTMAB/20SDS, the best absorption conditions: the concentrationof Phenol wastewater was 10mg/L, adjusted the pH to 8, the amount of anion-cationorganobentonite was 1.0g, the highest removal efficiency was 75.78％.The isotherms ofAniline indicated, under the normal temperature, the highest amount of adsorption is14.1205mg/g, and it was fitted well to the Freundlich Model. The thermodynamicalparament showed the adsorption of modified bentonite to the Aniline was primarily bythe chemical adsorption, it was a heat absorption and entropy increasing response,presenting the warming effect. The curve fitting result indicated the best adsorptiondynamic Model is the indexⅡModel, and the constant of dynamic was 0.9174; the IRshowed the organic modifier entered the bentonite layer, increased the organic modifiedbentonite adsorption, the function of coordination increasing dissolves; The SEMexpanded surfactant is likely to enter the bentonite layer, enlarged the layer spacing, thearea of modified bentonite increased. The orthogonal experiment showed that the bestpreparation condition of the rare earth modified bentonite was soaking in the acid concentration of 15%, and in La³⁺ concentration of 0.4% for 12 hours at normaltemperature, the pH of soaking La³⁺ was 10 and roasting 2.0 hours; The concentration ofPhenol wastewater was 50mg/L, the best adsorption process conditions: adjusted the pHof Phenol to 3～6, the amount of rare earth modified bentonite was 0.1 g, adsorption for60min, the removal efficiency could reach to 98.06%. The isotherms of Aniline indicated,under the normal temperature, the highest amount of adsorption is 14.1205mg/g, and itwas fitted well to the Langmuir Model. The thermo dynamical paramount showed theadsorption of modified bentonite to the aniline was primarily by the physical adsorption,it is a heat release and entropy decreasing response, presenting the warming negativeeffect. The curve fitting result indicated the best adsorption dynamic Model is the indexⅡModel, and the constant of dynamic was 0.9507; the IR showed rare earth modifiedbentonite changed water affinity characteristic of the bentonite; The SEM expanded rareearth is likely to enter the bentonite layer, enlarged the layer spacing, the surface paddedthe rare earth, the area of modified bentonite increased.