Application of Carboxymethyl Cellulose (CMC)-Coated Nanoscale Zero-Valent Iron in Chromium-Containing Soil Remediation

Bo Zhang, Jiani Zhan (), Jiaqi Fan (), Bohong Zhu, Weili Shen, Shiwei Zhang, Weiting Li, Zhaohui Li and Fanjun Zeng
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Bo Zhang: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Jiani Zhan: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Jiaqi Fan: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Bohong Zhu: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Weili Shen: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Shiwei Zhang: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Weiting Li: College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 421000, China
Zhaohui Li: Linwu Xiangxin Kaishun Water Service Co., Chenzhou 424300, China
Fanjun Zeng: Linwu Xiangxin Kaishun Water Service Co., Chenzhou 424300, China

Clean Technol., 2024, vol. 6, issue 4, 1-15

Abstract: Nanofine zero−valent iron (nZVI) is a new, eco−friendly material with strong reducing and adsorbent properties that can be used to clean up heavy metal−affected soils. Herein, nZVI encapsulated with carboxymethyl cellulose (CMC−nZVI) is synthesized via an aqueous−phase reduction technique and subsequently deployed to evaluate its effectiveness in Cr(VI) soil remediation. The characterization analysis used SEM−EDS, XRD, XPS, and LSV to determine the relevant properties of the material. The results show that at an initial Cr(VI) concentration of 169.5 mg·kg −1 , 93.2% of Cr(VI) was removed from the soil after 10 h of treatment with CMC−nZVI at pH 3.3. The kinetic analysis showed that CMC−nZVI had the maximum equilibrium adsorption capacity for removing Cr(VI) from soil at 105.3 mg·g −1 . This followed a pseudo−second−order kinetic model. The study shows that CMC−nZVI converts Cr(VI) to Cr(III), which forms complexes with Fe(III) ions in the presence of hydroxide ions (OH − ) to form a highly stable compound that eventually adsorbs into the nanomaterial’s surface for efficient removal.

Keywords: CMC?coated nanoscale zero?valent iron; removal; chromium?containing soil; removal mechanism (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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