首页|Preparation of Ag-MnFe204-bentonite Magnetic Composite for Pb(Ⅱ)/Cd(Ⅱ) Adsorption Removal and Bacterial Inactivation in Wastewater

Preparation of Ag-MnFe204-bentonite Magnetic Composite for Pb(Ⅱ)/Cd(Ⅱ) Adsorption Removal and Bacterial Inactivation in Wastewater

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An Ag-MnFe2O4-bentonite composite was synthesized by a chemical co-precipitation method and used for adsorption removal of Pb(Ⅱ),Cd(Ⅱ) and disinfection.The result of X-ray diffraction indicate that the diffraction peaks of MnFe2O4 and Ag can be perfectly indexed to the cubic spinel MnFe2O4(JCPDS No.88-1965) and metallic Ag(JCPDS No.41-1402),respectively.The results of scanning electron microscopy and energy dispersive X-ray spectroscopy manifest the deposition of MnFe2O4 and Ag on the bentonite surface and the presence of Mn,Fe and Ag.The result of X-ray photoelectron spectroscopy displayed that the composition of Ag-MnFe2O4-bentonite was Mn(Ⅱ),Fe(Ⅲ) and metallic Ag.The analysis of Brmauer-Emmett-Teller showed that the specific surface area of Ag-MnFe2O4-bentonite was the largest compared with that of bentonite,MnFe2O4 and MnFe2O4-bentonite.Thermodynamic studies revealed that the adsorption of Pb(Ⅱ) and Cd(Ⅱ) ions was spontaneous and endothermic.Lungmuir model showed an adsorption capacity of 129.87 mg/g for Pb(Ⅱ) and 48.31 mg/g for Cd(Ⅱ) ions.The adsorption kinetics of Pb(Ⅱ) and Cd(Ⅱ) ions onto Ag-MnFe2O4-bentonite can be best described by a pseudo-second-order model.The adsorption rate constant of the pseudo-second-order model was 0.0019 g·mg-kmin-1 for Pb(Ⅱ) and 0.0065 g·mg-1·min-1 for Cd(Ⅱ) ions.In addition to the adsorption experiment,the antibacterial properties of Ag-MrFe2O4-bentonite were studied through plate count method.Gram-negative(G-) bacteria Escherichia coli and Gram-positive(G+) bacteria Lactobacillus plantarum were used to test the antibacterial properties.The results showed that the composite demonstrated excellent antibacterial activity.Thus,Ag-MnFe2O4-bentonite can be employed as an adsorbent as well as an antimicrobial agent.

Ag-MnFe2O4-bentoniteAdsorptionHeavy metal ionBacterial inactivationWastewater treatment

LI Qin、ZHAO Yongsheng、QU Dan、WANG Haoying、CHEN Jin、ZHOU Rui

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Key Laboratory of Groundwater Resources and Environment, Ministry of Education,Jilin Provincial Key Laboratory of Water Resource and Environment,College of New Energy and Environment, Jilin University, Changchun 130021, P.R.China

Baohang Enrironment Company Limited, Beijing 100107, R.P.China

Supported by the Graduate Innovation Fund of Jilin University,ChinaKey Project of National Natural Science Foundation of China

201714641530636

2018

高等学校化学研究(英文版)
吉林大学

高等学校化学研究(英文版)

CSTPCDCSCDSCI
影响因子：0.871
ISSN：1005-9040
年,卷(期)：2018.34(5)
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