The enhanced effect of oxalic acid on the electroreduction of Cr(VI) via formation of intermediate Cr(VI)-oxalate complex

Environmental Technology
Yijie LiuBo Jiang

Abstract

In this study, the enhanced effect of oxalic acid (Ox) on Cr(VI) electroreduction was evaluated. It was found that for Cr(VI)-contaminated solution ([Cr(VI)]0 = 1.0 mM, pH = 3.0), addition of 5.0 mM Ox can significantly increase Cr(VI) reduction from 0.36 to 1.0 mM within 90 min electrolysis reaction, accompanying with the increase of current efficiency from 19% to 53%. Increasing initial Ox concentration (0-10 mM) and electric current (10-40 mA) facilitated Cr(VI) reduction, whereas it was inhibited with decreasing solution pH value (2.0-3.5) and elevating Cr(VI) concentration (0.1-2.0 mM), respectively. Results show that reactive electron was the primary reductant for the heterogeneous reduction of Cr(VI) on the cathode. In addition, Ox can also serve as an electron donor for the homogeneous reduction of Cr(VI). During this process, the formation of Cr(VI)-oxalate complex is indispensable for the enhanced Cr(VI) reduction. The coordination of Ox with Cr(VI) did not only make the structure of Cr(VI) more distorted but also improved the reactivity of Cr(VI) in Cr(VI)-oxalate complex toward reduction reaction. In general, this study provides an energy-efficient and environmentally benign strategy for the treatment of Ox and Cr(V...Continue Reading

References

Mar 29, 2002·Environmental Science & Technology·Maurizio PettineFrank J Millero
Apr 12, 2005·Environmental Science & Technology·Francisco Rodriguez-ValadezSilvia Gutierrez-Granados
Apr 23, 2010·Environmental Science & Technology·Alok D Bokare, Wonyong Choi
May 23, 2012·Journal of Hazardous Materials·Carlos E Barrera-DíazBryan Bilyeu
Nov 8, 2013·Environmental Science & Technology·Binoy SarkarMallavarapu Megharaj
Apr 29, 2014·Journal of Hazardous Materials·Jaesang LeeWonyong Choi
May 11, 2017·Environmental Technology·Preethi JohnsonThayumanavan Palvannan

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Citations

Aug 23, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Jianmin WangChin-Pao Huang
Oct 22, 2020·Scientific Reports·Hao Peng, Jing Guo
Jan 12, 2021·Chemical Engineering Journal·Jiani YaoDionysios D Dionysiou

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