铝钛柱撑系列改性膨润土处理含铬废水的应用研究

Study on the Treatment of Wastewater Containing Cr(Ⅵ) by Al-Ti Pillared Modified Montmorillonites

以钠基膨润土为原料,制备了铝钛无机柱撑、铝钛有机柱撑系列改性膨润土,比较了膨润土原土及铝钛无机有机柱撑改性膨润土处理含铬废水的性能,探讨了改性膨润土用量、pH值、搅拌时间等因素对膨润土吸附Cr(Ⅵ)实验的影响。结果表明:有机柱撑改性膨润土、无机柱撑改性膨润土对废水的处理效果明显好于原土;膨润土用量、废水的pH对Cr(Ⅵ)的吸附效率影响很大;在无机柱撑改性中,当pH为4,投加量为6g L,搅拌时间为30min,Cr(Ⅵ)质量浓度为30mg L时,Cr(Ⅵ)去除率达到66 5%;在有机柱撑改性中,当pH为5,投加量为6g L,搅拌时间为30min,Cr(Ⅵ)质量浓度为30mg L时,Cr(Ⅵ)去除率达到94 6%;铝钛无机、有机柱撑改性膨润土对铬离子水样处理的吸附等温线均符合Langmuir吸附等温方程,饱和吸附量和Langmuir常数分别为9 823,8 790mg g和4 5167,4 327。

A series of modified montmorillonites,including Al-Ti-inorgano-montmorillonite and Al-Ti-organo-montmorillonite,were synthesized from Na-montmorillonite.The performance of original montmorillonite,Al-Ti-inorgano-montmorillonite and Al-Ti-organo-montmorillonite was compared in treating wastewater containing Cr(Ⅵ).Some factors were examined in the experiment of absorbing Cr(Ⅵ) such as feeding amount of Al-Ti modified montmorillonites,pH of wastewater and stirring time,etc.The results showed as follows:Al-Ti-organo-montmorillonite and Al-Ti-inorgano-montmorillonite had obviously better treatment effects than original montmorillonite;the feeding amount of montmorillonite and pH of wastewater had great impasts on the adsorption efficiency of Cr(Ⅵ);for inorgano-montmorillonite,the Cr(Ⅵ) removal rate reached 66.5% in the case of pH 4,feeding amount 6 g/L,stirring time 30 min and mass concentration of Cr(Ⅵ)30 mg/L;for organo-montmorillonite,the Cr(Ⅵ) removal rate reached 94.6% in the case of pH 5,feeding amount 6 g/L,stirring time 30 min and mass concentration of Cr(Ⅵ) 30 mg/L;the adsorption isotherms of both inorgano-montmorillonite and inorgano-montmorillonite for Cr(Ⅵ) ion conformed to Langmuir adsorption isotherm, and the saturated adsorption amount and Langmuir constant are respectively 9.823,8.790 mg/g and 4.516 7,4.327.