Preparation of dumbbell manganese dioxide/gelatin composites and their application in the removal of lead and cadmium ions

Xiu Wang; Kai Huang; Ying Chen; Jiafa Liu; Shan Chen; Jianlei Cao; Surong Mei; Yikai Zhou; Tao Jing

doi:10.1016/j.jhazmat.2018.02.020

Preparation of dumbbell manganese dioxide/gelatin composites and their application in the removal of lead and cadmium ions

J Hazard Mater. 2018 May 15:350:46-54. doi: 10.1016/j.jhazmat.2018.02.020. Epub 2018 Feb 9.

Authors

Xiu Wang¹, Kai Huang¹, Ying Chen², Jiafa Liu², Shan Chen¹, Jianlei Cao¹, Surong Mei¹, Yikai Zhou¹, Tao Jing³

Affiliations

¹ State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, #13 Hangkong Road, Wuhan, Hubei, 430030, China.
² Hubei Center for Disease Control and Prevention, No.6 ZhuoDao Quan North Road, Wuhan 430079, China.
³ State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, #13 Hangkong Road, Wuhan, Hubei, 430030, China. Electronic address: jingtao@hust.edu.cn.

PMID: 29448213
DOI: 10.1016/j.jhazmat.2018.02.020

Abstract

The nano-sized sorbents restrict their practical application in flow-through system due to excessive pressure. In this study, dumbbell MnO₂/gelatin composites were synthesized based on the protein-assisted synthesis technology. Then they were immobilized on the amino-modified polymethyl methacrylate (PMMA) plate. SEM, TEM, XRD, XPS and FT-IR were employed to study the surface properties and the adsorption mechanism of MnO₂/gelatin composites. Adsorption experiments for Pb(II) and Cd(II) ions were performed to study the adsorption isotherms, kinetics, and thermodynamics as well as the influencing factors. The maximum adsorption capacities of Pb(II) and Cd(II) ions were 318.7 mg g^-1 and 105.1 mg g^-1 respectively. The adsorption process met the pseudo-second-order kinetic model. Subsequently, MnO₂/gelatin composites modified plates were used to remove the heavy metal ions in surface water and wastewater samples. The removal efficiencies of Pb(II) ion was changed from 83% (wastewater) to 100% (surface water), when the initial concentration was 10 mg L^-1. This device exhibited great application prospect in the removal of heavy metals taking advantage of its high removal efficiency, excellent stability and reusability and ease of operation.

Keywords: Adsorption mechanism; Amino-modified PMMA plate; Dumbbell MnO(2)/gelatin composites; Heavy metal ions; Water samples.

Publication types

Research Support, Non-U.S. Gov't