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| Oxidative aging process of biochar and its adsorption mechanism for cadmium |
| Received:March 15, 2021 |
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| KeyWord:biochar;aging;cadmium;adsorption properties;mechanism |
| Author Name | Affiliation | E-mail | | HE Yulei | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of AgroEnvironment and Agro-Product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SONG Ningning | Qingdao Rural Environmental Engineering Research Center, School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | | | LIN Dasong | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of AgroEnvironment and Agro-Product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | lindasong608@126.com | | SUN Yuebing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of AgroEnvironment and Agro-Product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Fangli | Qingdao Rural Environmental Engineering Research Center, School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | |
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| Abstract: |
| To study the effects of the aging process on the properties of biochar and its ability and mechanism of cadmium(Cd2+) adsorption, the hydrogen peroxide chemical oxidation method was used to simulate the aging process of rice husk biochar in the natural environment. An isothermal adsorption experiment was conducted to study the effects of the oxidative aging process on the ability of biochar to adsorb Cd2+. Scanning electron microscopy and energy spectrum analysis, Fourier transform infrared spectroscopy, and 13C nuclear magnetic resonance technology were used to explore the Cd2+ adsorption mechanism of biochar during oxidative aging. The results showed that the elemental composition and specific surface area of biochar did not change significantly during the oxidative aging process, whereas the oxygen-containing groups and the aromaticity increased. The adsorption of Cd2+ on biochar before and after aging was in line with the quasi-second-order kinetic model, but the oxidative aging process inhibited the Cd2+ adsorption capacity of rice husk biochar. The maximum Cd2+ adsorption capacity of the biochar predicted by the Langmuir isotherm at 298 K was in the order of unaged biochar(21.48 mg·g-1) >oxidative aging biochar 1(15.07 mg·g-1) >oxidative aging biochar 2(7.56 mg·g-1) >oxidative aging biochar 3(7.51 mg·g-1). The Cd2+ adsorption mechanism of biochar mainly included surface complexation, cation-π interaction, and ion exchange, and the change in alkali metal elements in the oxidative aging process inhibited surface adsorption. |
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