Journal
JOURNAL OF CLEANER PRODUCTION
Volume 191, Issue -, Pages 436-444Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.04.217
Keywords
Chromium; Antimony; Zero valent iron; Sulfidation; Sequestration
Categories
Funding
- Shenzhen science and technology research and development funds [JCYJ20160331174544721]
- Natural Science Foundation of Shandong Province, China [ZR2016EEM50]
Ask authors/readers for more resources
Chromium and antimony may coexist in industrial wastewater such as the textile and dyeing field. Sulfidated zero valent iron (S-ZVI) is attracting more attention due to its simple preparation and high reactivity with contaminants. The reaction with pollutants may be a complex mixture of redox, sorption, and coprecipitation. In this work S-ZVI was used to sequester Cr(VI) and Sb(III) simultaneously in open and well-mixed batch reactors. The correlation between Cr(VI) and Sb(III) sequestration by S-ZVI, the influence of different S/Fe molar ratios, the initial concentration of Cr(VI) and Sb(III), the initial pH and the addition of Fe(II) and other factors were investigated to evaluate the performance of S-ZVI and to demonstrate the reaction mechanism. Experimental results showed that S-ZVI could sequester Cr(VI) and Sb(III) efficiently and the S/Fe molar ratio had a dramatic effect on the removal rate, the highest kobs was obtained when the S/Fe molar ratio was 0.056. The X-ray photoelectron spectroscopy (XPS) showed that Cr(VI) could be reduced to Cr(III) and Sb(III) could be oxidized to Sb(V) simultaneously, adsorption and coprecipitation also coexisted in this system. A certain amount of Sb(III) could promote the sequestration of Cr(VI) but Sb(III) sequestration was hardly affected by Cr(VI). Furthermore, catalase was used as a masking agent of hydrogen peroxide, the results indicated that hydrogen peroxide may play an important role in the sequestration of Cr(VI) and Sb(III), which need to be further investigated. (C) 2018 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available