[1]郭晓婧,张志毅,郭掌珍,等.DDTC改性磁性纳米Fe3O4对水中镉的吸附行为[J].中国给水排水,2021,37(9):57-64.
　GUO Xiao-jing,ZHANG Zhi-yi,GUO Zhang-zhen,et al.Absorption Behavior of Cadmium in Aqueous Solution by DDTC Modified Magnetic Nano-Fe3O4[J].China Water & Wastewater,2021,37(9):57-64.
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DDTC改性磁性纳米Fe3O4对水中镉的吸附行为

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第9期 页码: 57-64 栏目: 出版日期: 2021-05-01
Title:
Absorption Behavior of Cadmium in Aqueous Solution by DDTC Modified Magnetic Nano-Fe3O4
作者:
郭晓婧，张志毅，郭掌珍，吴瑜
(山西农业大学资源环境学院，山西太谷030801)
Author(s):
GUO Xiao-jing,ZHANG Zhi-yi,GUO Zhang-zhen,WU Yu
(College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China)
关键词:
二乙基二硫代氨基甲酸钠; 磁性纳米材料; Fe3O4; 镉; 吸附; 改性
Keywords:
sodium diethyldithiocarbamate; magnetic nanomaterial; Fe3O4; cadmium; adsorption; modification
摘要:
采用二乙基二硫代氨基甲酸钠(DDTC)改性磁性纳米材料Fe3O4，制得一种新型磁性纳米材料（DDTC-MNPs），并用于吸附重金属Cd2+。借助扫描电镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)、热重分析仪(TG)等手段对其进行表征，采用批量吸附实验考察了该材料对Cd2+的吸附性能。结果表明，DDTC-MNPs粒径约为20 nm；其对Cd2+的去除率随溶液pH值的增加而增加，在较广的pH值范围（3.0~7.0）对Cd2+实现有效吸附；共存离子K+、Na+、Ca2+和Mg2+会对DDTC-MNPs吸附Cd2+产生一定影响，但仍能保持良好吸附效果；吸附动力学表明，DDTC-MNPs对Cd2+的吸附在10 min内基本达到平衡，符合准二级动力学；等温吸附符合Langmuir模型（R2>0.97），表明该吸附为单分子层化学吸附，理论最大吸附量为21.74 mg/g；DDTC-MNPs对Cd2+的吸附热力学参数ΔG0<0、ΔH0<0、ΔS0<0，表明吸附反应为自发放热反应；经吸附-解吸4次后，DDTC-MNPs对Cd2+的去除率仍高于70%。
Abstract:
A novel adsorbent (DDTC-MNPs) was prepared by modifying magnetic nano-Fe3O4 with sodium diethyldithiocarbamate (DDTC), which was employed to adsorb heavy metal Cd2+. The properties of DDTC-MNPs were characterized by SEM, XRD, FTIR and TG, and Cd2+ adsorption capacity of the material was investigated by batch adsorption experiments. The results showed that the particle size of DDTC-MNPs was about 20 nm. The removal efficiency of Cd2+ by DDTC-MNPs increased with the increase of pH, and effective adsorption was achieved in a wide range of pH (3.0-7.0). The presence of K+，Na+，Ca2+ and Mg2+ had a certain impact on the adsorption of Cd2+，but it could still keep good adsorption effect. Adsorption kinetics showed that the adsorption of Cd2+ by DDTC-MNPs reached equilibrium within 10 min, which was in line with the pseudo-second-order model. Isothermal adsorption conformed to the Langmuir model (R2>0.97) with the maximum theoretical adsorption capacity of 21.74 mg/g, indicating that the adsorption was a monolayer chemical adsorption. The Cd2+ adsorption thermodynamic parameters of DDTC-MNPs, namely ΔG0, ΔH0 and ΔS0, were all less than zero, indicating that the adsorption reaction was spontaneous thermal reaction. The removal efficiency of Cd2+ was still larger than 70% after four times of adsorption and desorption.
更新日期/Last Update: 2021-05-01