摘要
以四甲基溴化铵(TAB)和聚二烯丙基二甲基氯化铵(PDMDAAC)为改性剂,对天然钠基膨润土进行双阳离子复合改性,制得低成本吸附剂双阳离子复合改性膨润土(T/P-PRT)。用FTIR、BET等手段进行表征,考察了吸附剂用量、初始pH、吸附温度、接触时间等因素对水中偶氮染料甲基橙(MO)的去除效果影响。结果表明,膨润土经改性后,比表面积和孔容变小,平均孔径增大。T/P-PRT对MO的最佳吸附条件为MO初始浓度为500 mg/L、溶液pH为4、吸附剂用量为10 g/L、反应温度为298 K、吸附时间为480 min。在此最佳吸附条件下,吸附量和去除率都达到了最大值,分别为42.66 mg/g和85.33%。MO在T/P-PRT上的吸附过程更符合准二级动力学模型和Langmuir等温模型,吸附过程为化学单层吸附和放热反应。
Using tetramethylammonium bromide(TAB)and polydiallyl dimethyl ammonium chloride(PDMDAAC)as modifiers,natural sodium bentonite was modified with double cationic compound,and the low-cost adsorben(T/P-PRT)was prepared.The removal effect of methyl orange(MO)in water was investigated by FTIR,BET,and some effect factors were proposed,such as the amount of adsorbent,initial pH value,adsorption temperature,and contact time.The results showed that the specific surface area and pore volume of bentonite became smaller and the average pore size increased after modification.The optimal adsorption conditions of T/P-PRT for MO were as follows:the initial concentration of MO was 500 mg/L,the pH was 4,the amount of adsorbent was 10 g/L,the reaction temperature was 298 K,the adsorption time was 480 min.Under the optimal adsorption conditions,the maximum adsorption capacity and removal rate were 42.66 mg/g and 85.33%,respectively.The adsorption process of MO on T/P-PRT is more consistent with the quasi-second-order kinetic model and Langmuir isothermal model,and the adsorption process consists of chemical monolayer adsorption and exothermic reaction.
作者
崔立莉
谢寅盼
焦莉
叶正芳
CUI Lili;XIE Yinpan;JIAO Li;YE Zhengfang(Department of Municipal and Environmental Engineering,Hebei University of Architecture,Zhangjiakou 075000,China;Key Laboratory of Water and Sediment Science,Ministry of Education,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2022年第12期89-93,108,共6页
Technology of Water Treatment
基金
北京市科技计划项目(Z151100000915065)
河北省重点研发计划项目(17273614)
河北建筑工程学院项目(B201301)。
关键词
复合改性
钠基膨润土
季铵盐
甲基橙
compound modification
sodium bentonite
quaternary ammonium salt
methyl orange
