https://scholars.lib.ntu.edu.tw/handle/123456789/606039
標題: | Elucidating the redox-driven dynamic interactions between arsenic and iron-impregnated biochar in a paddy soil using geochemical and spectroscopic techniques | 作者: | Yang X Shaheen S.M Wang J Hou D Ok Y.S Wang S.-L Wang H Rinklebe J. SHAN-LI WANG |
關鍵字: | Fe-based biochar;Immobilization mechanisms;Redox conditions;Soil remediation;Toxic metal(loid)s;Arsenic;Remediation;Soil pollution;Soils;Bio chars;Dynamic interaction;Geochemical techniques;Paddy soils;Redox condition;Reducing conditions;Soils remediation;Soil conservation;arsenic;biochar;detection method;environmental risk;immobilization;infrared spectroscopy;paddy field;redox conditions;spectroscopy;charcoal;iron;Oryza;oxidation reduction reaction;soil;soil pollutant;Charcoal;Iron;Oxidation-Reduction;Soil;Soil Pollutants | 公開日期: | 2022 | 卷: | 422 | 來源出版物: | Journal of Hazardous Materials | 摘要: | Iron (Fe)-modified biochar, a renewable amendment that synthetizes the functions of biochar and Fe materials, demonstrates a potential to remediate arsenic (As)-contaminated soils. However, the effectiveness of Fe-based biochar to immobilize As in paddy soils under varying redox conditions (Eh) has not been quantified. We tested the capability of the raw (RBC) and Fe-impregnated (FeBC) biochars to immobilize As in a paddy soil under various Eh conditions (from -400 to +300 mV) using a biogeochemical microcosm system. In the control, As was mobilized (686.2–1535.8 μg L-1) under reducing conditions and immobilized (61.6–71.1 μg L-1) under oxidizing conditions. Application of FeBC immobilized As at Eh < 0 mV by 32.6%–81.1%, compared to the control, because of the transformation of As-bound Fe (hydro)oxides (e.g., ferrihydrite) and the formation of complexes (e.g., ternary As-Fe-DOC). Application of RBC immobilized As at Eh < -100 mV by 16.0%–41.3%, compared to the control, due to its porous structure and oxygen-containing functional groups. Mobilized As at Eh > +200 mV was caused by the increase of pH after RBC application. Amendment of the Fe-modified biochar can be a suitable approach for alleviating the environmental risk of As under reducing conditions in paddy soils. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112268028&doi=10.1016%2fj.jhazmat.2021.126808&partnerID=40&md5=545b46be50361fe5b59e986998b57215 https://scholars.lib.ntu.edu.tw/handle/123456789/606039 |
ISSN: | 03043894 | DOI: | 10.1016/j.jhazmat.2021.126808 |
顯示於: | 農業化學系 |
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