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Cd2+ adsorption performance of tunnel-structured manganese oxides driven by electrochemically controlled redox
Lihu Liu; Qichuan Peng; Guohong Qiu; Jun Zhu; Wenfeng Tan; Chengshuai Liu; Lirong Zheng; Zhi Dang
2019
Source PublicationEnvironmental Pollution
Volume244Pages:783-791
Abstract

The heavy metal ion adsorption performance of birnessite (a layer-structured manganese oxide) can be enhanced by decreasing the Mn average oxidation state (Mn AOS) and dissolution−recrystallization during electrochemical redox reactions. However, the electrochemical adsorption processes of heavy metal ions by tunnel-structured manganese oxides are still enigmatic. Here, tunnel-structured manganese oxides including pyrolusite (2.3 Å × 2.3 Å tunnel), cryptomelane (4.6 Å × 4.6 Å tunnel) and todorokite (6.9 Å × 6.9 Å tunnel) were synthesized, and their electrochemical adsorptions for Cd2+ were performed through galvanostatic charge−discharge. The influence of both supporting ion species in the tunnel and tunnel size on the electrochemical adsorption performance was also studied. The adsorption capacity of tunnel-structured manganese oxides for Cd2+ was remarkably enhanced by electrochemical redox reactions. Relative to K+ in the tunnel of cryptomelane, the supporting ion H+ was more favorable to the electrochemical adsorption of Cd2+. With increasing initial pH and specific surface area, the electrochemical adsorption capacity of cryptomelane increased. The cryptomelane electrode could be regenerated by galvanostatic charge−discharge in Na2SO4 solution. Due to the differences in their tunnel size and supporting ion species, the tunnel-structured manganese oxides follow the order of cryptomelane (192.0 mg g−1) > todorokite (44.8 mg g−1) > pyrolusite (13.5 mg g−1) in their electrochemical adsorption capacities for Cd2+.

KeywordHeavy Metal Ions Electrochemical Adsorption Cryptomelanetodorokite Pyrolusite
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10354
Collection环境地球化学国家重点实验室
Affiliation1.Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuh
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
3.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039, China
4.School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
Recommended Citation
GB/T 7714
Lihu Liu,Qichuan Peng,Guohong Qiu,et al. Cd2+ adsorption performance of tunnel-structured manganese oxides driven by electrochemically controlled redox[J]. Environmental Pollution,2019,244:783-791.
APA Lihu Liu.,Qichuan Peng.,Guohong Qiu.,Jun Zhu.,Wenfeng Tan.,...&Zhi Dang.(2019).Cd2+ adsorption performance of tunnel-structured manganese oxides driven by electrochemically controlled redox.Environmental Pollution,244,783-791.
MLA Lihu Liu,et al."Cd2+ adsorption performance of tunnel-structured manganese oxides driven by electrochemically controlled redox".Environmental Pollution 244(2019):783-791.
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