Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (5): 870-876.doi: 10.1007/s40242-020-0169-0

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Reduction Removal of Cr(VI) from Wastewater by CO2·- Deriving from Formate Anion Based on Activated Carbon Catalyzed Persulfate

ZHOU Rui, LI Tingting, ZHANG Lijian, JIAO Xinqian   

  1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resource and Environment, College of New Energy and Environment, Jilin University, Changchun 130021, P. R. China
  • Received:2020-06-05 Revised:2020-07-06 Online:2020-10-01 Published:2020-10-01
  • Contact: JIAO Xinqian E-mail:jiaoxq@jlu.edu.cn
  • Supported by:
    Supported by the National Nature Science Foundation of China(No.41302184), the Project of the Research on Water Environmental Protection Strategy and Management Policy in Beijing-Tianjin-Hebei Region, China(No.2018ZX07111001), the Scientific Frontier and Interdisciplinary Research Project of Jilin University, the Outstanding Youth Cultivation Plan of Jilin University, the Fund of the Key Laboratory of Groundwater Resources and Environmental of Ministry of Education(Jilin University), China, and the Project of the National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology of China.

Abstract: As a strong reducing radical, carbon dioxide anion radical(CO2·-) can be generated by initiating sulfate radical(SO4·-) in the presence of formate anions(FA) for Cr(VI) reduction. Moreover, activated carbon(AC)-catalyzed persulfate(PS) oxidation is an economically justifiable, environmentally friendly, and easy-to-scale-up method to produce SO4·-. The complete removal of Cr(VI) was achieved within 280 min for an initial Cr(VI) concentration of 50 mg/L under the optional condition of c(AC)=1 g/L, [PS]0=10 mmol/L, [FA]0=10 mmol/L, T=30℃, and unadjusted pH. When the molar ratio of FA to PS was greater than or equal to 1, the system maintained a strong reduction state. The mechanism investigation confirmed that FA was converted to carboxyl anion radical(CO2·-) as the predominant radical for Cr(VI) reduction. This novel system may offer a potential platform technology for Cr(VI) wastewater treatment.

Key words: Cr(VI), Activated carbon, Carboxyl anion radical, Persulfate, Reduction