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| Mechanism of cadmium adsorption by oxidative aging corn straw biochar |
| Received:November 06, 2021 Revised:March 09, 2022 |
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| KeyWord:biochar;corn straw;aging;adsorption mechanism;cadmium |
| Author Name | Affiliation | E-mail | | MA Kaiyue | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Hao | 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 | | | WANG Fangli | Qingdao Rural Environmental Engineering Research Center, School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China | | | LIN Dasong | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | lindasong608@126.com |
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| Abstract: |
| To study the adsorption response of corn straw biochar to Cd2+ after simulated natural aging, corn straw biochar was oxidized and aged for 1, 2, and 3 times using H2O2. The adsorption and response mechanism of Cd2+ by biochar before and after aging were analyzed using elemental analyzer, scanning electron microscope, infrared spectrum, and carbon spectrum. The results showed that silicate precipitation was formed during the oxidative aging of corn straw biochar. After H2O2 aging, the atomic ratios of H/C, O/C, and(O+N)/C gradually increased, resulting in the increase of oxygen-containing functional groups, weakening of aromaticity and enhancement of polarity of biochar. After aging for 1, 2, and 3 times, the alkaline elements of corn straw biochar OYM1, OYM2, and OYM3 were released, and the alkaline elements were reduced by 48.23%, 95.04%, and 95.74%, respectively compared with the unaged corn straw biochar (YM). The maximum adsorption capacity of aged corn straw biochar for Cd2+ was in the order as follows:YM(12.42 mg·g-1) >OYM1(5.98 mg·g-1) >OYM3(3.88 mg·g-1) >OYM2(3.61 mg·g-1), indicating that aging inhibits its adsorption of Cd2+. Long-term usage of corn straw biochar may probably promote the role of inorganic components and weaken its adsorption performance; therefore, it should be used reasonably in the remediation of soil and water pollution. |
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