Studies on the preparation of sodium bentonite and adsorption characteristics to Cu(Ⅱ)
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摘要:
【目的】制备钠基膨润土并探讨其对Cu(Ⅱ)的吸附特性和规律.【方法】以氯化钠作钠化剂,采用悬浮液法工艺对钙基膨润土进行钠化改型制得钠基膨润土,然后用钠基膨润土对Cu(Ⅱ)进行吸附研究,通过吸附等温线的拟合探讨其吸附特性以及酸度、温度对吸附的影响.【结果和结论】 改型膨润土对Cu(Ⅱ)的吸附符合Freundlich吸附模型,是一种单分子层的表面吸附,90 min可达到吸附平衡,酸度越低吸附量越大,但pH大于5以后,吸附量就趋于稳定;而温度越高吸附量越小,当温度高于35 ℃后,吸附量就基本不变.在25 ℃和pH5时,向50 mL 10.0 mg·L-1的铜离子溶液中加入0.200 g改型膨润土,去除率达到97.85%,表明该改型膨润土可在铜离子的去除方面发挥重要作用.
Abstract:
【Objective】To preparing sodium bentonite and investigate its adsorption characteristics to Cu(Ⅱ).【Method】The calcium bentonite was converted into sodium bentonite with sodium chloride as the conversion agent by suspension method. The adsorption characteristics of modified bentonite to Cu(Ⅱ) were conducted by fitting the adsorption isotherm as well as the influence of the acidity and temperature.【Result and conclusion】It was shown that the adsorption of modified bentonite to Cu(Ⅱ) conformed with the Freundlich pattern,which was a single molecular layer adsorption,with 90 min reaching to equilibrium,the lower acidity, the greater adsorption capacity. However, the adsorption capacity reached stability after pH>5,the higher temperature, the smaller adsorption capacity,with the adsorption capacity remaining unchanged when the temperature was higher than 35 ℃. At the 25 ℃ and pH5,the removal rate reached 97.85% when 0.200 g modified bentonite was added to the 50 mL 10.0 mg/L copper ion solution. Results show that the modified bentonite can play an important role in the removal of copper ion.