The Preparation Of O-MMT And Adsorption Behaviour Of Dye Wastewater

Adsorption with its small investment,simple process,low cost and other characteristics has a special status in the field of wastewater treatment.Montmorillonite as a crude adsorbent is favored by many researchers,because it's cheap and easy to get.In this paper,the research includes the following aspects:Firstly,the preparation and characterization of organic montmorillonite(O-MMT).The sodium montmorillonite was modified with quaternary ammonium salt hexadecyltrimethylammonium bromide(CTMAB).Batch experiments were conducted to study the effects of time,temperature,dosage of quaternary ammonium salt on the modification.The results shows that the modified dosage at 1.0 CEC,modification time 3 h,modification temperature of 60 ?,the modification effect is the best.The structure was characterized by scanning electron microscopy(SEM),fourier transform infrared spectrometer(FTIR)and other means.The second,the study on the adsorption behaviour of methyl orange onto O-MMT.The O-MMT was used to treat methyl orange aqueous solution.Batch experiments were conducted to study the effects of the dosage of O-MMT,contact time,system temperature and initial pH on the adsorption of methyl orange.Batch experiments were conducted to study the effects of the dosage of O-MMT,contact time,system temperature and initial p H on the adsorption of methyl orange.The optimum conditions were as follows: the O-MMT dosage 2.0g/L,contact time 20 min,the system temperature 20 ?,under which the color removal rate could reach more than 95%,and the O-MMT adsorption capacity was 24.1 9mg/g.The adsorption behavior of methyl orange on O-MMT was further studied.The adsorption isotherm equation,thermodynamics and kinetics were studied.The results show that the adsorption of methyl orange on O-MMT is in accordance with Langmuir adsorption isotherm model,which is a physical process of spontaneous exotherm,which accords with the pseudo-second order kinetic model.The third,the study on the adsorption behaviour of indigo onto O-MMT.The O-MMT was used to treat indigo aqueous solution.Batch experiments were conducted to study the effects of the dosage of O-MMT,contact time,system temperature and initial pH on the adsorption of indigo.The optimum conditions were as follows: the O-MMT dosage 0.1g/L,contact time 15 min,the system temperature at room temperature pH 7.0,under which the color removal rate can reach more than 93.2 6%,and the O-MMT adsorption capacity was 464.4 7mg/g.The adsorption behavior of indigo on O-MMT was further studied.The adsorption isotherm equation,thermodynamics and kinetics were studied.The results show that the adsorption of indigo on O-MMT is in accordance with Langmuir adsorption isotherm model,which is a physical process with chemical change of spontaneous endothermic,which accords with the pseudo-second order kinetic model.The forth,the study on competitive adsorption of methyl violet and methylene blue onto O-MMT.The O-MMT was used to treat methyl violet and methylene blue aqueous solution.Batch experiments were conducted to study the effects of the dosage of O-MMT,contact time and initial pH on the adsorption of methyl violet and methylene blue.Three basic dyes of methyl violet and methylene blue were treated under the non-competition.Under the optimized conditions,the adsorption capacity of O-MMT for the two dyes was 36.50 mg/g and 30.58 mg/g,respectively.The adsorption isotherms and kinetics of O-MMT for two kinds of dyes were further studied.Both adsorption of the two kinds of dyes on O-MMT were in accordance with Langmuir adsorption isothermal model and pseudo-second order kinetic model.The O-MMT was used to treat methyl violet and methylene blue mix aqueous solution.Competitive adsorption of dyes were studied by Least squares(LES)regression analysis.The adsorption of two kinds of dyes on the O-MMT was in accordance with the Extended-Langmuir model.