Efficient removal of Cd2+ from aqueous solution with a novel composite of silicon supported nano iron/aluminum/magnesium (hydr)oxides prepared from biotite

被引:8
作者
Zeng, Qiang [1 ,2 ]
Sun, Wei [1 ]
Zhong, Hui [3 ]
He, Zhiguo [1 ,4 ]
机构
[1] Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China
[2] South Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518000, Peoples R China
[3] Cent South Univ, Sch Life Sci, Changsha 410083, Peoples R China
[4] Jiangxi Univ Sci & Technol, Fac Mat Met & Chem, Ganzhou 341000, Jiangxi, Peoples R China
关键词
Cd2+ removal; Biotite; Comprehensive utilization; Removal mechanisms; CADMIUM; CD(II); PERFORMANCE; ADSORPTION; PB(II); IRON; MECHANISMS; ADSORBENT; BIOCHARS; BEHAVIOR;
D O I
10.1016/j.jenvman.2021.114288
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Taking low cost silicate minerals to develop efficient Cd2+ adsorption materials was favorable to the comprehensive utilization of minerals and remediation of environmental pollution. In this study, a composite of silicon supported nano iron/aluminum/magnesium (hydr)oxides was prepared with biotite by combining acid leaching and base precipitation process, which was used to remove Cd2+. Cd2+ adsorption behaviors were in accordance of pseudo-second order kinetic model and Langmuir model, and the obtained maximal Cd-2+ adsorption capacity was 78.37 mg/g. Increasing pH and temperature could accelerate the removal of Cd2+. The activation energy was calculated as 66.05 kJ/mol, meaning that Cd2+ removal process was mainly depended on chemical adsorption. XRD and SEM results showed that this composite was a micro-nano structure of layered silica supported nano iron/aluminum/magnesium (hydr)oxides. Cd2+ removal mechanisms were consisted of surface complexation and ion exchange between Cd2+ and other metal ions, and the ion exchange interaction played the major role. These results indicated that a novel efficient utilization way for silicate minerals was developed.
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页数:10
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