改性玉米芯的制备及其对Pb^(2+)吸附性能研究  

Study on the Preparation of Modified Corncob and Its Adsorption Properties for Pb^(2+)

作　　者：翟继武 林杨 潮洛濛[2] 谢文波 

机构地区：[1]赤峰市环境监测中心站,内蒙古赤峰024000 [2]内蒙古大学生命科学学院,内蒙古呼和浩特010021

出　　处：《电镀与精饰》2017年第9期42-46,共5页Plating & Finishing

摘　　要：在N,N-二甲基甲酰胺中,以次磷酸钠为催化剂,采用柠檬酸对氢氧化钠处理过的玉米芯进行化学改性,制备得到生物吸附剂,并研究其对Pb^(2+)的吸附性能。通过探讨投加量、吸附时间、Pb^(2+)溶液的不同吸附温度、pH等因素研究改性玉米芯对废水Pb^(2+)吸附性能的影响。结果表明,改性的玉米芯投加质量为0.5 g、pH为7、Pb^(2+)初始质量浓度为100 mg/L时,吸附性能较好,吸附平衡时间t为120 min,最大吸附率为88.10%、最大吸附量为35.24 mg/g。可以用准二级动力学方程和Langmuir方程描述改性玉米芯的吸附过程。Corncob was chemically treated by sodium hydroxide and then modified by citric acid. Its adsorption properties for Pb（2＋）was studied in N,N-dimethylformamide（ DMF） solution using sodium hypophosphite as catalyst. Factors including dosage,adsorption time,pH value,temperature were used to evaluate the Pb（2＋）adsorption rate in wastewater by modified corncob. The best results were obtained under the condition including dosage of 0. 5 g,pH value of 7,Pb（2＋）initial concentration of 100 mg/L. The adsorption equilibrium time was 120 min and the maximum adsorption rate was 88. 10% with the maximum adsorption quantity of 35. 24 mg/g. The adsorption process of modified corncob can be well described by quasitwo-order kinetics equation and Langmuir equation.

关 键 词：玉米芯 PB2+ 化学改性 生物吸附 

分 类 号：X731[环境科学与工程—环境工程]