The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation
Journal Title: Energy Environmental Protection - Year 2024, Vol 38, Issue 1
Abstract
Oxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely existiug carboxylic acids, and has a dramatic impact on the reduction of chromate in natural waters. In this study, isothermal titration calorimetry (ITC), theoretical calculations, and electrospray ionization high resolution mass spectrometry (ESI-HRMS) analysis revealed that oxalic acid could complex with chromate to form a Cr(Ⅵ)-oxalate complex via an esterification process at pH≤4. The in situ generated HC2CrO7 complex was a visible-light-active species, and visible light could induce electron transfer from the oxalate unit to the Cr(Ⅵ) within the HC2CrO7 complex via a HOMO-LUMO electronic transition, resulting in Cr(Ⅵ) reduction. Subsequently, we verified the Cr(Ⅵ) reduction intermediates, and the hypotoxic Cr(Ⅲ) species [Cr3+-(C2O2-4)3] 3- was the final product. Finally, the pathway of Cr(Ⅵ) reduction by oxalic acid under visible-light irradiation was proposed. This study will provide a theoretical basis for efficient photoreduction of Cr(Ⅵ) pollution using oxalic acid.
Authors and Affiliations
GUAN Yingying|Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, China, WANG Hao|Department of Security and Protection, Aecc South Industry Company Limited, China, GE Xiaoming|Department of Security and Protection, Aecc South Industry Company Limited, China, DENG Likai|Department of Security and Protection, Aecc South Industry Company Limited, China, DENG Bin|Department of Security and Protection, Aecc South Industry Company Limited, China, MU Yi*|Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, China, ZOU Jianping*|Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, China
Keywords
Related Articles
- EP ID EP736949
- DOI 0.20078/j.eep.20240123
- Views 39
- Downloads 0
Carbon emission forecasting in Zhejiang Province based on LASSO algorithm and grey model
Under the green and low-carbon development goal of achieving "carbon peaking and carbon neutrality" in China, cyclical analysis and accurate prediction of carbon emissions are of great importance. This paper investigates...
Research and application progress of carbon capture technology in the iron and steel industry
Carbon emission reduction in the iron and steel industry is critical for achieving China′s carbon neutral goal. This paper systematically reviews the research and application progress of various carbon capture technologi...
Progress of reductive catalytic fractionation of lignocellulosic biomass based on the lignin-first strategy
Lignocellulosic biomass is the most abundant renewable carbon resource on the planet, which has the potential to replace oil to produce clean fuels and chemicals. At present, the efficient utilization of lignin component...
Research progress of wastewater treatment and resource recovery based on microalgae-bacteria consortia
Based on microalgae biological treatment technology, the microalgae-bacteria symbiosis system can not only efficiently realize sewage recycling, but also utilize the interactions between microalgae and bacteria to enhanc...
Study on the performance and mechanism of high-efficiency deep oxidation of butyl acetate over Pd/CeO_2
In the field of new energy vehicles and related sectors, treating butyl acetate (BA), a typical oxygen-containing volatile organic compound (VOC), is becoming increasingly important. The surface structure and physicochem...