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| Effects of myo-inositol hexakisphosphate on the transformation of carbonate green rust |
| Received:June 24, 2022 |
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| KeyWord:carbonate green rust;myo-inositol hexakisphosphate;transformation;goethite;ferric green rust |
| Author Name | Affiliation | E-mail | | SUN Yali | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | | | JIANG Guanjie | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | | | JIANG Rui | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | | | LAN Shuai | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | | | LI Yang | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | | | YAN Yupeng | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | ypyan@jxau.edu.cn | | ZHANG Qin | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045, China | chincheung@live.com |
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| Abstract: |
| Green rust exists widely in paddy soil, sediment, groundwater, and other environments, and its transformation is affected by various environmental geochemical factors. Carbonate green rust[GR1(CO32-)] was synthesized by air oxidation, and the effect of organic phosphorus(myo-inositol hexakisphosphate, IHP) on the transformation process and mechanism of green rust was investigated. The solid products in the system were characterized by X-ray diffraction, attenuated total reflection Fourier-transform infrared spectroscopy, highresolution transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The results showed that GR1(CO32-) was completely converted to goethite in approximately 5 h in the absence of IHP, while the transformation of GR1(CO32-) was inhibited in the presence of IHP. In the presence of 0-0.5 mmol·L-1 IHP, the transformation product of GR1(CO32-) was goethite, while GR1(CO32-) was transformed into goethite and ferric green rust when the concentration of IHP was above 1.0 mmol·L-1. The effect of IHP on the conversion mechanism of GR1(CO32-) was directly related to its concentration. In a system with a low concentration of IHP(0-0.5 mmol·L-1), the conversion process of GR1(CO32-) only involved the dissolution-oxidation-precipitation(DOP) mechanism. However, in a system with a high concentration of IHP(1.0-5.0 mmol·L-1), the solid-state oxidation(SSO) mechanism dominated, and GR1(CO32-) was partially converted into goethite through a dissolution reprecipitation mechanism, and GR1(CO32-) was partially transformed into ferric green rust via an in situ deprotonation reaction. In addition, during the transformation of GR1(CO32-), IHP formed inner-sphere complexes or(ferro) ferric phytate precipitates on the surface of GR1(CO32-) and its transformation products. Overall, IHP inhibites the dissolutionreprecipitation transformation mechanism of GR1(CO32-) and hinderes the crystallization and crystal growth of goethite, and the inhibition is positively correlated with the concentration of IHP. |
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