Predicting laterite redox potential with iron activity and electron transfer term

被引:1
作者
Ji, Yanping [1 ,2 ]
Xu, Jiang [1 ,2 ]
Zhu, Lizhong [1 ,2 ]
机构
[1] Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China
[2] Zhejiang Prov Key Lab Organ Pollut Proc & Control, Hangzhou 310058, Peoples R China
基金
中国国家自然科学基金;
关键词
Laterite; Redox potential; Iron activity; Electron transfer; Modeling; Iron speciation; Soil remediation; ZERO-VALENT IRON; PHOSPHATE; KINETICS; MODEL; ADSORPTION; DESORPTION; SOILS; FERRIHYDRITE; AGGREGATION; SPECIATION;
D O I
10.1016/j.chemosphere.2023.138519
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Predicting the redox behavior of organic contaminants and heavy metals in soils is challenging because there are few soil redox potential (Eh) models. In particular, current aqueous and suspension models usually show a sig-nificant deviation for complex laterites with few Fe(II). Here, we measured the Eh of simulated laterites over a range of soil conditions (2450 tests). The impacts of soil pH, organic carbon, and Fe speciation on the Fe activity were quantified as Fe activity coefficients, respectively, using a two-step Universal Global Optimization method. Integrating these Fe activity coefficients and electron transfer terms into the formula significantly improved the correlation of measured and modeled Eh values (R2 = 0.92), and the estimated Eh values closely matched the relevant measured Eh values (accuracy R2 = 0.93). The developed model was further verified with natural lat-erites, presenting a linear fit and accuracy R2 of 0.89 and 0.86, respectively. These findings provide compelling evidence that integrating Fe activity into the Nernst formula could accurately calculate the Eh if the Fe(III)/Fe(II) couple does not work. The developed model could help to predict the soil Eh toward controllable and selective oxidation-reduction of contaminants for soil remediation.
引用
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页数:8
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