摘要
为了获得去除重金属离子Pb^(2+)和Cr^(6+)的特异性强、易回收的高性能吸附剂,通过将铁锰铈金属氧化物(Fe-Mn-Ce)负载到强酸性阳离子树脂(D001)上,成功制备了树脂基铁锰铈吸附剂(Fe-Mn-Ce@D001)。研究了吸附剂对水中Pb^(2+)、Cr^(6+)的去除性能,考察了不同因素对Pb^(2+)、Cr^(6+)去除率的影响,同时进行吸附动力学以及吸附热力学实验,探讨其吸附规律。实验结果表明:在温度为298K、pH=5、投加量为0.01g时,Fe-Mn-Ce@D001对Pb^(2+)和Cr^(6+)的饱和吸附容量分别为528.06mg/g和218.33mg/g,优于原树脂D001。Fe-Mn-Ce@D001树脂比D001对Pb^(2+)和Cr^(6+)具有更高的吸附选择性,在高浓度Ca^(2+)、Mg^(2+)、NO_(3)^(-)、SO_(4)^(2-)等离子共存的条件下仍保持较高的去除率;在Pb^(2+)和Cr^(6+)混合溶液中比D001具有更好的同步吸附性能;相对于D001具备更好地重复利用性。Fe-Mn-Ce@D001对Pb^(2+)和Cr^(6+)的吸附等温模型均符合Langmuir模型,吸附动力学行为与准一级动力学和准二级动力学均能很好的相符。
In order to obtain a high-performance adsorbent with high specificity and easy recovery for the removal of heavy metal ions Pb^(2+)and Cr^(6+),a resin-based iron-manganese cerium adsorbent(Fe-Mn-Ce@D001)was successfully prepared by loading iron-manganese cerium metal oxides(Fe-Mn-Ce)onto a strongly acidic cationic resin(D001).The performance of the adsorbent on the removal of Pb^(2+)and Cr^(6+)from water was investigated.The effects of different factors on the removal rate of Pb^(2+)and Cr^(6+)were examined,and the adsorption kinetics as well as the adsorption thermodynamics experiments were carried out to explore the adsorption law.The experimental results showed that the saturation adsorption capacities of Fe-Mn-Ce@D001 for Pb^(2+)and Cr^(6+)were 528.06 mg/g and 218.33 mg/g,respectively,at 298 K,pH=5 and 0.01 g dosage,which were better than the original resin D001.The Fe-Mn-Ce@D001 resin had higher adsorption selectivity for Pb^(2+)and Cr^(6+)than D001.The adsorption isothermal model of Fe-Mn-Ce@D001 for Pb^(2+)and Cr^(6+)is consistent with the Langmuir model.The adsorption kinetic behaviors were in good agreement with the quasi-primary and quasi-secondary kinetics.
作者
张洛红
刘建宇
刘彩琴
杨巧巧
李庆
ZHANG Luohong;LIU Jianyu;LIU Caiqin;YANG Qiaoqiao;LI Qing(School of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710600,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第5期5133-5140,共8页
Journal of Functional Materials
基金
国家级大学生创新创业训练计划项目(202110709008)
陕西省科技攻关项目(2019GY186)
陕西省重点研发计划项目(2022GY-161)。
关键词
吸附
阳离子交换树脂
铁锰铈金属氧化物
铅
铬
去除
adsorption
cation exchange resin
iron-manganese cerium metal oxide
lead
chromium
removal
