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CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution
Cheng, Yujun1; Dong, Haoran2,3; Hao, Tianwei1
2021-02-15
Source PublicationSeparation and Purification Technology
ISSN1383-5866
Volume257Pages:117967
Abstract

In this study, calcium carbonate (CaCO) coated nanoscale zero-valent iron (referred to as C-nZVI) was successfully synthesized and used for the removal of Cr(VI) in aqueous solution. The obtained C-nZVI particles were observed to be chain-like structure of spherical particles with a smooth surface by Transmission Electron Microscope (TEM). The magnetic hysteresis loop manifested that C-nZVI (CaCO/Fe = 1:4, mass ratio) was ferromagnetic and the saturation magnetization (Ms) was 115.48 emu/g, revealing that C-nZVI had favorable properties of separation, recovery and reuse. Regarding the Cr(VI) removal, no positive correlation between the removal efficiencies and CaCO/Fe mass ratio increasing from CaCO/Fe = 0.5:4 to 4:4. Meanwhile, complete removal of Cr(VI) was observed at initial pH = 3.0 and initial Cr(VI) concentration of 5 mg/L, and the removal efficiency gradually decreased with increasing the initial pH and initial Cr(VI) concentration. The water chemistry had a more or less influence on the reactivity of C-nZVI. Specifically, the presence of Ca and Mg facilitated the Cr(VI) removal by C-nZVI, but the PO and humic acid (HA) impeded the reactivity of C-nZVI. NO is generally considered to have an adverse influence on nZVI, but it displayed a positive effect on C-nZVI, which should be ascribed to the promotion of C-nZVI corrosion. Additionally, C-nZVI aged for 2 d and 30 d in air had a similar removal efficiency (83.2% and 82.6%) of Cr(VI) as fresh C-nZVI (85%), whereas the Cr(VI) removal efficiency by C-nZVI aged for the same aging times in aqueous solution were approximate 65.9% and 46.6%, respectively.

KeywordAging Caco3 Chromium Nanoscale Zero-valent Iron Water Chemistry
DOI10.1016/j.seppur.2020.117967
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000596110900004
Scopus ID2-s2.0-85094889033
Fulltext Access
FWCI4.14986
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorDong, Haoran; Hao, Tianwei
Affiliation1.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, 999078, China
2.College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China
3.Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Cheng, Yujun,Dong, Haoran,Hao, Tianwei. CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution[J]. Separation and Purification Technology,2021,257:117967.
APA Cheng, Yujun,Dong, Haoran,&Hao, Tianwei.(2021).CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution.Separation and Purification Technology,257,117967.
MLA Cheng, Yujun,et al."CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution".Separation and Purification Technology 257(2021):117967.
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