有机改性膨润土吸附污水中Cr^(6+)的研究

Study on Adsorption of Cr^(6+) by Organic Modified Bentonite

以十六烷基三甲基溴化铵为有机插层剂,研究钠基膨润土有机化的影响因素及有机膨润土吸附低浓度含Cr6+废水的热力学行为。结果表明,制备有机膨润土的优化工艺条件是:体系pH为7,活化温度为70℃,配料比为1.1 mmol/g,固液比为0.05 g/mL,活化时间为1 h;当有机膨润土的质量浓度为8 g/L时,对水溶液中Cr6+的去除率可达98%以上;有机膨润土吸附Cr6+符合Freundlich等温吸附方程。

The influence factors of sodium based organic bentonite and thermodynamic behaviors of organic bentonite adsorbing the low concentration Cr6+waste water were studied,taking cetyltrimethyl ammonium bromide as organic intercalation agent.The results show that the optimization conditions of preparing organic bentonite are as follows,the system pH is 7,the reaction temperature is 70 ℃,the modifier dosage is 1.1 mmol/g,the liquid-solid ratio is 0.05 g/mL and the activated time is 1 h.When the mass concentration of organic bentonite is 8 g/L,the removal rate of Cr6+ can reach more than 98%.The adsorption of Cr6+ by organic bentonite follows Freundlich isotherm model.