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Facile Improvement of Nanoscale Zero-Valent Iron Activity with Exceptional Stability for Reduction of Cr(VI)

AbstractIn the present study, a highly active reaction system of nanoscale zero-valent (nZVI) was successfully established by enhancing nZVI with a biodegradable complexing agent (CA) and applied to hexavalent chromium [Cr(VI)] removal. Both iminodisuccinic acid (IDS) and N,N-bis(carboxymethyl)gluta...

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Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 2020-03, Vol.146 (3)
Main Authors: Zhou, Hongyi, Zhao, Yongkang, Xiang, Junchao, Huang, Ning, Ali Baig, Shams, Hu, Die
Format: Article
Language:English
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Summary:AbstractIn the present study, a highly active reaction system of nanoscale zero-valent (nZVI) was successfully established by enhancing nZVI with a biodegradable complexing agent (CA) and applied to hexavalent chromium [Cr(VI)] removal. Both iminodisuccinic acid (IDS) and N,N-bis(carboxymethyl)glutamic (GLDA) are good biodegradable CAs with strong ability to Cr(III)/Fe(II)/Fe(III). Cr(VI) (10.0  mg L−1) removal efficiency by nZVI increased from 60.1% to 100.0% with the addition of 4.0  mmol L−1 IDS or GLDA for 60 min. A characterization analysis suggested that nZVI and CA enhanced Cr(VI) removal by decreasing the surface passivation layer, which was expected to be (CrxFe1-x)(OH)3. In addition, the Cr(VI) removal efficiency decreased with increasing initial pH, and appropriate CA dosage (4.0  mmol L−1) and temperature (25.0°C) were beneficial for the efficient reduction of Cr(VI). An amount of 94.8% of Cr(VI) removal was achieved within the initial 2 min when the experiment conditions were as follows: 0.1  g L−1 nZVI, 4.0  mmol L−1 GLDA, the temperature at 25.0°C, an initial pH of 7.0, and stirring at 200  r min−1. And the Cr(VI) removal by GLDA improved nZVI maintained above 84.3% after three consecutive cycles. The results indicate CA-enhanced-nZVI could be a promising approach for the Cr(VI) removal in a solution.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)EE.1943-7870.0001674