【摘要】 试验研究了西宁盆地坡缕石粘土对Cd2+的吸附性能,考察了改性方法、搅拌时间、粘土投加量、吸附温度、溶液初始浓度等因素对吸附效果的影响。结果表明,采用Na2CO3改性时,Na2CO3与粘土最佳配比为3∶100;吸附的适宜条件为:搅拌时间50min、粘土投加量1.5g/100mL Cd2+溶液、吸附温度20℃;在试验的浓度范围内,Cd2+在粘土上的吸附规律符合Langmuir等温模型。西宁盆地坡缕石粘土对Cd2+具有较好的吸附性能,粘土投加量为每100mL Cd2+溶液2.5g时,处理后溶液中Cd2+含量下降到0.1mg/L以下,符合GB8796-1996第一类污染物最高排放标准。更多还原

【Abstract】 In this paper the adsorption of Cd2+ onto the palygorskite clay in Xining basin was studied.The adsorption effects were investigated comprehensively by varying the modified methods,stirring time,clay dosage,adsorption temperature and initial solutions concentration etc.The results showed that,using Na2CO3 modifying the clay,the best ratio for Na2CO3 and clay is 3:100.The appropriate adsorption conditions were that stirring time of 50min,clay dosage of 1.5g/100mL and adsorption temperature of 20℃.In the range of experimental concentration,the adsorption of Cd2+ onto the clay was consistent with Langmuir isotherm.The content of Cd2+ in the treated solution was under 0.1mg/L when the clay dosage was 2.5g/100g.This result meets the standard GB8796-1996 for treating first class pollutants.更多还原