摘要
以柠檬酸为改性试剂,制得柠檬酸改性膨润土。通过单因素实验研究改性土在吸附时间、吸附溫度、吸附剂用量、不同苯酚初始浓度、pH等条件对苯酚的吸附效果,结果表明,在吸附时间1 h,温度为50℃,改性土的投加量为3 g/L,苯酚初始浓度为200 mg/L,pH值为7时达到最佳的吸附效果,最大吸附量为28.02 mg/g,去除率为42.44%,比膨润土提高了8.87%。由吸附热力学和动力学表明,Langmuir等温模型更可以表示此吸附反应,为吸热过程;准二级动力学适于描述此反应。
Citric acid modified bentonite was made by using calcium-based bentonite as raw material and citric acid as modified reagent.The adsorption effect of modified soil on phenol was studied by single factor experiment in adsorption time,adsorption temperature,adsorbent dosage,different phenol initial concentration,pH and other conditions.The results showed that when the adsorption time was 1 h,the temperature was 50℃,the dosage of modified soil was 3 g/L,the initial concentration of phenol was 200 mg/L,and the pH value was 7,the optimum adsorption effect was achieved,the maximum adsorption amount was 28.02 mg/g,the removal rate was 42.44%,which was 8.87%higher than that of bentonite.It was shown by adsorption thermodynamics and kinetics that the Langmuir Isothermal model could also represent this adsorption reaction,which was heat absorption reaction,and the Pseudo-second order kinetics was suitable for describing this reaction.
作者
魏娟
江煜
张军良
王雪飞
舒世立
WEI Juan;JIANG Yu;ZHANG Jun-liang;WANG Xue-fei;SHU Shi-li(Befar Group Co.,Ltd.,Shandong Binzhou 256600;Zhejiang Jinhua New Materials Co.,Ltd.,Zhejiang Quzhou 324000;Department of Chemistry,Tangshan Normal University,Hebei Tangshan 063000,China)
出处
《广州化工》
CAS
2020年第19期51-56,共6页
GuangZhou Chemical Industry
基金
河北省高等学校科学研究项目(Z2018034)
河北省重点研发计划:高新技术共性关键技术攻关与应用示范专项(17211411)
唐山师范学院化学系2019年大学生创新创业训练计划项目(CX201904)。
关键词
柠檬酸
膨润土
改性
吸附
苯酚
citric acid
bentonite
modified
adsorption
phenol