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为改善印染废水的深度处理效果,通过吸附试验研究掺杂不同铁含量的介孔SiO2微球(Fe-MSM)吸附水中甲基紫(MV)染料的最佳吸附条件、动力学方程和吸附机理。采用XRD、FT-IR、N2吸附-脱附、SEM及AAS对吸附剂进行表征,考察了吸附剂用量、吸附时间、初始染料浓度、pH对吸附性能的影响,得出表观动力学方程及相关参数,并探讨了吸附机理。结果表明:铁掺杂量不同对MV吸附率的影响不大;初始浓度为50mg/L MV溶液,吸附剂用量为10mg,吸附平衡时间为30min,pH偏弱碱性时吸附性能最好达99%。吸附过程符合表观二级动力学方程,颗粒内扩散是速率控制步骤。
In order to improve the effect of deep treatment of printing and dyeing wastewater, the optimum adsorption conditions, kinetic equation and adsorption mechanism of methyl violet (MV) dye adsorbed on mesoporous silica microspheres (Fe-MSM) doped with different iron content were studied by adsorption experiments . The adsorbents were characterized by XRD, FT-IR, N2 adsorption-desorption, SEM and AAS. The effects of adsorbent dosage, adsorption time, initial dye concentration and pH on the adsorption properties were investigated. The apparent kinetic equation and Related parameters, and discussed the adsorption mechanism. The results show that: the different iron doping amount has little effect on the adsorption rate of MV; the initial concentration of 50mg / L MV solution, the amount of adsorbent is 10mg, the adsorption equilibrium time is 30min; %. Adsorption process in line with the apparent second-order kinetic equation, intra-particle diffusion rate control step.