Possibility of removing cadmium pollution from the environment using a newly synthesized material coal fly ash

被引：0
作者：
Hanghang Zhao
Xunrong Huang
Guibin Zhang
Jingtian Li
Zhenli He
Puhui Ji
Junzhe Zhao
机构：
[1] Northwest A&F University,College of Natural Resources and Environment
[2] Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product,Key Laboratory of Original Agro
[3] University of Florida,Environmental Pollution Prevention and Control
[4] Chinese Academy of Sciences,Indian River Research and Education Center, Institute of Food and Agricultural Sciences
[5] Shenzhen ImMidas Environmental Technology Co.,Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology
[6] Ltd,undefined
来源：
Environmental Science and Pollution Research | 2020年 / 27卷
关键词：
Fly ash; Modification; Cadmium; Adsorption;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Coal fly ash (FA) is a solid waste produced in coal combustion. This study focused on the removal of Cd2+ from wastewater by a newly synthesized adsorbent material, the low-temperature and sodium hydroxide–modified fly ash (SHM-FA). The SEM and BET analyses of SHM-FA demonstrated that the adsorbent was porous and had a huge specific surface area. The XRF, XRD, FTIR and TGA characterization showed that SHM-FA has an amorphous structure and the Si–O and Al–O in the fly ash dissolved into the solution, which improved the adsorption capacity of Cd. The results indicated that SHM-FA has desired adsorption performance. The adsorption performance was significantly affected by the dosage, starting pH, Cd2+ initial concentrations, and temperature, as well as adsorption time. In the optimal conditions, the removal efficiency and adsorption capacity of Cd2+ by SHM-FA were 95.76% and 31.79 mg g−1, respectively. The experiment provided clearly explained adsorption kinetics and isotherms. And the results confirmed that the adsorption behavior was well described by the pseudo-second-order kinetic and Langmuir isotherm model, which means that the adsorption of Cd2+ was controlled by SHM-FA through surface reaction and external diffusion process. In addition, the recycling of SHM-FA for reuse after Cd2+ adsorption showed high removal efficiency up to six times of use. Therefore, it can be concluded that SHM-FA is a low-cost adsorbent for Cd2+ removal from wastewater.
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页码：4997 / 5008
页数：11
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