西宁盆地坡缕石黏土对铅离子吸附性能的研究

Study on adsorption performance of Pb^(2+) onto palygorskite clay in Xining basin

以西宁盆地坡缕石黏土为吸附剂,研究了其对铅离子吸附性能的影响。考察了黏土的改性方法、搅拌时间、黏土投加量、吸附温度、溶液初始铅离子质量浓度等因素对吸附效果的影响。结果表明:西宁盆地坡缕石黏土对铅离子具有良好的吸附性能。适宜的吸附条件:采用硫酸为改性剂,硫酸用量为10 g黏土加入0.049 g硫酸;搅拌时间为50 min,黏土投加量为100 mL铅液加入0.10~0.15 g黏土,吸附温度为室温。在此条件下,当溶液中铅离子初始质量浓度为107.65 mg/L时,黏土对铅离子的吸附容量达到107 mg/g以上,铅离子去除率接近100%。在实验质量浓度范围内,铅离子在黏土上的吸附符合Langmuir等温线。

As the adsorbent,the adsorption performance of palygorskite clay in Xining basin to Pb2＋ was studied.Influences of the factors,such as modified methods of clay,stirring time,clay dosage,adsorption temperature,and initial Pb2＋ mass concentration of the solution,on adsorption effects were investigated.Results showed that the palygorskite clay in Xining basin exhibited good adsorption performance to Pb2＋;when using sulfuric acid modifying the clay,the appropriate amount of sulfuric acid was 0.049 g per 10 g clay;and the appropriate adsorption conditions were that stirring time of 50 min,clay dosage of 0.10~0.15 g/100 mL Pb2＋ solution,and room temperature.Under these conditions,the adsorption capacity of Pb2＋ onto the clay reached over 107 mg/g when the initial mass concentration of Pb2＋ in the solution was 107.65 mg/L and the removal ratio of Pb2＋ was about 100%.Within the range of experimental mass concentration,the adsorption of Pb2＋ onto the clay was consistent with Langmuir isotherm.