摘要
气凝胶在吸附领域具有很好的应用前景。本文采用水热合成法和冷冻干燥法制备出葡甲胺功能化还原氧化石墨烯/羟基化碳纳米管气凝胶应用于盐湖卤水除硼,研究了吸附剂对水溶液中硼的吸附行为,吸附过程符合拟二级动力学和Freundlich等温吸附模型。当初始硼浓度为1000mg/L、pH为10、吸附时间为9h、温度298K时,最大吸附量为33.64mg/g。响应面法可以预测实验结果并优化反应条件,在最佳条件下硼吸附量为32.91mg/g。吸附机理分析表明,吸附过程主要是吸附剂上的—OH官能团与B的络合作用。吸附剂经过三次吸附-脱附实验,仍对B有较高吸附容量。吸附剂具有良好的抗共存盐干扰性,在真实卤水中吸附性能良好,吸附量为23.87mg/g。该气凝胶对于从盐湖卤水和废水中提硼具有潜在的价值。
Aerogels have promising applications in the field of adsorption.In this study,methylglucamine-functionalized reduced graphene oxide/hydroxylated carbon nanotube aerogels were prepared by hydrothermal synthesis and freeze-drying method for boron removal from salt lake brines.The adsorption behavior of the adsorbent on boron in aqueous solution was investigated,and the adsorption process was in accordance with the pseudo-second-order kinetic model and Freundlich isothermal adsorption model.The maximum adsorption amount was 33.64mg/g when the initial boron concentration was 1000mg/L,pH was 10,the adsorption time was 9h and the temperature was 298K.The response surface method could predict the experimental results and optimize the reaction conditions,and the boron adsorption amount was 32.91mg/g under the optimal conditions.The adsorption mechanism analysis showed that the adsorption process mainly consisted of the complexation of the—OH functional group on the adsorbent with B.The adsorbent still had a high adsorption capacity for B after three adsorption-desorption experiments.The adsorbent had good resistance to coexisting salt interference and good adsorption performance in real brine with an adsorption capacity of 23.87mg/g.This aerogel was potentially valuable for boron extraction from salt lake brines and wastewater.
作者
潘彤彤
崔香梅
PAN Tongtong;CUI Xiangmei(College of Chemical Engineering,Qinghai University,Xining 810016,Qinghai,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第6期3386-3397,共12页
Chemical Industry and Engineering Progress
基金
青海省应用基础研究计划(2019-ZJ-7044)。
关键词
葡甲胺
氧化石墨烯
碳纳米管
硼
响应面法
methylglucamine
graphene oxide
carbon nanotubes
boron
response surface methodology
