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- Title
Removal of Hexavalent Chromium from Simulated Wastewater by Polyethylene Glycol–Modified D201 Resin-Supported Nanoscale Zero-Valent Iron.
- Authors
Wang, Shuang; Zhong, Dengjie; Xu, Yunlan; Zhong, Nianbing
- Abstract
In view of the increasingly prominent heavy metal pollution problem in water, D201 resin-supported polyethylene glycol–modified nanoscale zero-valent iron (PEG-nZVI/D201) was fabricated to remove Cr(VI) in wastewater. PEG-nZVI/D201 can overcome the agglomeration and oxidation drawbacks of nZVI effectively, and improve the removal efficiency of Cr(VI). Its Cr(VI) removal rate was 33.6% higher than that of bare nZVI when the dosage of PEG-nZVI/D201 was 1.0 g·L−1, the Cr(VI) concentration was 50 mg·L−1, and the initial pH was 5.0. The maximum adsorption capacity of Cr(VI) on PEG-nZVI/D201 reached 134.56 mg·g−1 at 318 K. The Langmuir model better describes the adsorption of Cr(VI) on PEG-nZVI/D201. Thermodynamic parameters show that the adsorption process is spontaneous and endothermic. The mechanism of Cr(VI) removal by PEG-nZVI/D201 is as follows: firstly, protonated PEG-nZVI/D201 adsorbs Cr(VI) by electrostatic attraction, then nZVI reduces most of Cr(VI) to Cr(III) through its strong reducibility, and finally, Cr(III) can form CrXFe1-X(OH)3 co-precipitation with Fe(III) produced by oxidation of nZVI.
- Subjects
HEXAVALENT chromium; HEAVY metal toxicology; POLYETHYLENE; SEWAGE; ION exchange resins; IRON
- Publication
Water, Air & Soil Pollution, 2022, Vol 233, Issue 11, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-022-05920-2