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Stabilization of Cd2+/Cr3+ During Aqueous Fe(II)-Induced Recrystallization of Al-Substituted Goethite
Chengshuai Liu;  Manjia Chen;  Fangbai Li;  Liang Tao;  Jun Lin;  Ting Gao;  Hui Tong;  Yuhui Liu;  Shengqiao Long;  Fei Wu;  Yafei Xia
2019
发表期刊Soil Science Society of America Journal
卷号83期号:2页码:483-491
摘要

The aqueous Fe2+ (Fe2+aq)–induced recrystallization of iron minerals is an important geochemical process with critical effects on the environmental behavior of metal pollutants in soils. However, the effects of different heavy metals with distinctive physicochemical properties on the Fe2+aq–induced recrystallization of iron minerals and the different stabilization behaviors of these heavy metals remain unclear. This study examined the effects of Cd2+ and Cr3+ on the Fe2+aq–induced recrystallization of Al‐substituted goethites and the simultaneous stabilization of Cd2+/Cr3+ ions by the recrystallized Al‐substituted goethites. Results from stable Fe isotopic tracer experiments and Mössbauer characterization show that Fe atoms were exchanged between Fe2+aq and structural Fe(III) in Al‐substituted goethites with coexisting Cd2+/Cr3+, although both Cd2+ and Cr3+ decreased the exchange rates. During the Fe atom exchange, Al‐substituted goethites were recrystallized and a portion of Cd2+/Cr3+ ions were stabilized by the resulting goethite products. Compared with Cd2+, more Cr3+ ions were immobilized by the recrystallized Al‐substituted goethites due to the lower hydrolysis constant of Cr3+ than Cd2+, as well as the closer ionic radius of Cr3+ with Fe3+ and Al3+. Al‐goethites with higher Al contents further decreased the Fe atom exchange rates while increasing the amounts of immobilized metal ions when in the presence of Cd2+ or Cr3+. The findings of the present study suggest that the physicochemical properties of metal ions play critical roles in affecting their environmental behavior and fates during Fe2+aq–induced recrystallization of iron minerals in soils.

关键词Bet Brunauer–emmett–teller Specific Surface Area Tem Transmission Electron Microscope Xrd X-ray Diffraction
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10241
专题环境地球化学国家重点实验室
作者单位1.State Key Lab. of Environ. Geochem. Inst. of GeochemistryChinese Academy of Sciences Guiyang 550081, China
2.Guangdong Key Lab. of Integrated Agro-Environ. Pollut. Control & Management Inst. of Eco-Environ. Sci. & Tech. Guangzhou 510650, China
3.Key Lab. of Nuclear Analysis Techniques Shanghai Inst. of Applied Physics Chinese Academy of Sciences Shanghai 201800, China
4.Univ. of Chinese Academy of Sciences Beijing 100049, China
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GB/T 7714
Chengshuai Liu;Manjia Chen;Fangbai Li;Liang Tao;Jun Lin;Ting Gao;Hui Tong;Yuhui Liu;Shengqiao Long;Fei Wu;Yafei Xia. Stabilization of Cd2+/Cr3+ During Aqueous Fe(II)-Induced Recrystallization of Al-Substituted Goethite[J]. Soil Science Society of America Journal,2019,83(2):483-491.
APA Chengshuai Liu;Manjia Chen;Fangbai Li;Liang Tao;Jun Lin;Ting Gao;Hui Tong;Yuhui Liu;Shengqiao Long;Fei Wu;Yafei Xia.(2019).Stabilization of Cd2+/Cr3+ During Aqueous Fe(II)-Induced Recrystallization of Al-Substituted Goethite.Soil Science Society of America Journal,83(2),483-491.
MLA Chengshuai Liu;Manjia Chen;Fangbai Li;Liang Tao;Jun Lin;Ting Gao;Hui Tong;Yuhui Liu;Shengqiao Long;Fei Wu;Yafei Xia."Stabilization of Cd2+/Cr3+ During Aqueous Fe(II)-Induced Recrystallization of Al-Substituted Goethite".Soil Science Society of America Journal 83.2(2019):483-491.
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