Nano zero-valent iron supported by macroporous styrene ion exchange resin for enhanced Cr(VI) removal from aqueous solution
Wei Gao, Dengjie Zhong, Yunlan Xu, Han Luo, Sijing Zeng
Abstract
In view of problem that nanoscale zero-valent (nZVI) is easy to agglomerate and deactivate in the process of wastewater treatment, a styrene-based ion exchange resin D201 is selected as the carrier to load it. D201-loaded nZVI (D201@nZVI) was applied to treat simulated Cr(VI) wastewater. Receiving the effect and influence of electrostatic attraction, Cr(VI) will attach to D201@nZVI, partly reduced to Cr(III) by nZVI to form CrxFe1−x(OH)3 co-precipitation. D201@nZVI shows good treatment capacity of a wide pH range, and excellent regeneration performance. The removal rate and maximum adsorption amounts of 50 mg L−1 Cr(VI) reached 100% and 123.14 mg g−1, respectively. D201@nZVI has promising potential to be applied in situ groundwater remediation.