摘要
采用煅烧结合氢氧化钠处理的方式对高岭土进行改性,在通过FT-IR、XRD、XRF等表征手段分析高岭土改性前后理化性质变化基础上,对改性高岭土吸附去除氯化钙溶液中Cu^(2+)和Pb^(2+)进行研究。讨论了吸附时间、氯化钙溶液pH和吸附剂用量对高岭土和改性高岭土吸附去除氯化钙溶液中Cu^(2+)和Pb^(2+)的影响,研究了改性高岭土在氯化钙溶液中吸附去除Cu^(2+)和Pb^(2+)的吸附动力学和等温吸附过程行为。研究发现,改性使高岭土发生非晶化转变,负电性、比表面积和孔容增大;在吸附时间40~120 min区间内,改性高岭土对氯化钙溶液中Cu^(2+)和Pb^(2+)的平均吸附容量比高岭土高了3.57和3.17 mg/g,且吸附容量随吸附时间增加而提高并渐趋平衡;对氯化钙溶液中Cu^(2+)的吸附容量随溶液pH增大先提高后降低,对Pb^(2+)的吸附容量随溶液pH增大逐渐增大;随着吸附剂用量增加,氯化钙溶液中Cu^(2+)和Pb^(2+)的吸附容量逐渐降低;改性高岭土对Cu^(2+)和Pb^(2+)的吸附过程符合拟二级动力学方程和Langmuir等温吸附模型。
Kaolin was modified by calcination combined with sodium hydroxide treatment.The changes in physicochemical properties of kaolinite before and after modification were analyzed by FT-IR,XRD,XRF and other characterization methods.On this basis,the adsorption removal of Cu^(2+) and Pb^(2+) from calcium chloride solution by modified kaolinite was investigated.The effects of adsorption time,pH of calcium chloride solution and adsorbent dosage on the adsorption removal of Cu^(2+) and Pb^(2+) from calcium chloride solution by kaolinite and modified kaolinite were discussed.The adsorption kinetics and isothermal adsorption process behavior of modified kaolinite were analyzed for the adsorption removal of Cu^(2+) and Pb^(2+) in calcium chloride solution.It was found that the modification caused an amorphous transformation of kaolinite and the increase of electronegativity,specific surface area and pore volume.The average adsorption capacity of Cu^(2+) and Pb^(2+) in calcium chloride solution by modified kaolin was 3.57 and 3.17 mg/g higher than that without modification in the range of adsorption time from 40 to 120 min.The adsorption capacity was first increased and then to equilibrium with the increase of adsorption time.The adsorption capacity of Cu^(2+) in calcium chloride solution was first increased and then decreased with the increase of solution pH,while the adsorption capacity of Pb^(2+) was increased with the increase of solution pH.The adsorption capacities of Cu^(2+) and Pb^(2+) from calcium chloride solution were decreased with the increase of adsorbent dosage.The adsorption processes of modified kaolin for Cu^(2+) and Pb^(2+) were consistent with the pseudo second order kinetic equation and Langmuir isothermal adsorption model.
作者
王豪波
易芸
付成兵
刘飞
曹建新
潘红艳
Haobo Wang;Yun Yi;Chengbing Fu;Fei Liu;Jianxin Cao;Hongyan Pan(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang,Guizhou 550025,China;Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang,Guizhou 550025,China;Guizhou Provincial Engineering Research Center of Efficient Utilization for Waster,Guiyang,Guizhou 550025,China)
出处
《日用化学工业》
CAS
北大核心
2022年第8期819-826,共8页
China Surfactant Detergent & Cosmetics
基金
国家重点研发计划(2018YFC1900202)
贵州省科技计划项目(黔科合支撑[2021]一般489)
贵州省科技计划项目黔科合服企([2018]4011)。
关键词
高岭土
氯化钙
吸附容量
改性
kaolin
calcium chloride
adsorption capacity
modification
