钠化改性河南南部膨润土吸附亚甲基蓝性能分析  

Adsorption of Methylene Blue on Sodium-Modified Bentonite from Southern Part of Henan

作　　者：程飞鹏 杨冬亮 常乐 吴登峰 CHENG Fei-peng;YANG Dong-liang;CHANG Le;WU Deng-feng(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;School of Resources and Environment,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]电子科技大学资源与环境学院,成都611731

出　　处：《环境科学》2022年第12期5676-5686,共11页Environmental Science

基　　金：国家重点研发计划项目(2019YFE0110900)。

摘　　要：以河南南部天然钙基膨润土为原料,通过钠化改性得到了钠基膨润土.通过调控吸附剂用量、亚甲基蓝(MB)浓度、吸附时间、溶液pH值和温度,分析对比了天然钙基膨润土(PRT-1)、钙基提纯膨润土(PRT-1T)和钠基膨润土(PRT-1Na)对MB的去除效率.同时,对PRT-1T和PRT-1Na对MB的吸附动力学和吸附机制进行了研究.结果表明,由于PRT-1Na有更大的比表面积、更高的阳离子交换容量和更丰富的羟基结构,表现出对MB更好的吸附效果.在同等吸附条件下,PRT-1Na的吸附效果是PRT-1的4倍,PRT-1T是PRT-1的2倍.在20℃,pH为6,PRT-1Na用量为1.0 g,吸附时间为2 h,MB为500 mL,且初始浓度为500 mg·L^(-1)时,MB去除率高达99.89%.另外,PRT-1Na对MB染料废水的吸附既存在物理吸附也有化学吸附,Elovich模型对PRT-1T和PRT-1Na吸附MB染料废水的过程拟合度均高,但伪一级动力学模型对PRT-1Na拟合效果最好.Natural calcium-based bentonite from southern Henan province was used as raw material,and sodium-based bentonite was obtained through sodium modification.The removal efficiency of natural calcium-based bentonite(PRT-1),calcium-based purified bentonite(PRT-1T),and sodium-based bentonite(PRT-1Na)on MB was analyzed and compared by regulating the adsorbent dosage,methylene blue(MB)concentration,adsorption time,solution pH,and temperature.Meanwhile,the adsorption kinetics and adsorption mechanism of PRT-1T and PRT-1Na on MB were investigated.The results showed that PRT-1Na exhibited better adsorption of MB due to its larger specific surface area,higher cation exchange capacity,and more abundant hydroxyl structure.Under the same adsorption conditions,the adsorption effect of PRT-1Na was four times that of PRT-1,and PRT-1T was twice that of PRT-1.At 20℃,a pH of 6,PRT-1Na dosage of 1.0 g,adsorption time of 2 h,500 mL of MB,and an initial concentration of 500 mg·L^(-1),the MB removal rate was as high as 99.89%.In addition,there was both physical and chemical adsorption of PRT-1Na on MB dye wastewater,and the Elovich model fitted well for both PRT-1T and PRT-1Na adsorption of MB dye wastewater;however,the pseudo first-order kinetic model fitted best for PRT-1Na.

关 键 词：钠基膨润土 吸附 亚甲基蓝 吸附机制 动力学模型 

分 类 号：X703.1[环境科学与工程—环境工程]