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Effective in-situ reduction of Cr(VI) from leather wastewater by advanced reduction process based on CO2·- with visible-light photocatalyst.
Chemosphere. 2021 Jan; 263:127898.C

Abstract

Advanced reduction process (ARP) has drawn an increasing interest as a new manner for removing oxidative pollutants in water. In this paper, we demonstrate the possibility of in-situ reduction of Cr(VI) by CO2·- produced from formate originally existing in leather wastewater by visible-light-driven ARP containing black TiO2 photocatalyst. The prepared black TiO2 with nanotube structure achieves remarkable enhanced the reduction rate of Cr(VI) as high as 96.2% (k = 0.0114 min-1) in the presence of formate, which is approximately 4.75 times than that of 56.3% (k = 0.0024 min-1) in the absence under 120 min visible-light irradiate at unadjusted pH. The results exhibit a distinct contrast with commercial TiO2 (P25). A series of control experiments are also performed, indicating that formate is able to convert the oxidative environment into a highly reductive one, and the formate concentration, black TiO2 dosage and pH may greatly impact on the Cr(VI) reduction rate. According to the electron spin resonance (ESR) measurement, CO2·- radicals can be directly verified as dominate radical in this system. Moreover, this system appears to be attractive for creating photochemical systems where in-situ production of CO2·- radicals may be realized by using formate. Then this in-situ ARP system will provide a new perspective for the Cr(VI) removing, which makes leather wastewater treatment much easier and more sustainable in the future.

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Authors+Show Affiliations

Liu X
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
Liu G
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
You S
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China. Electronic address: sjyou@hit.edu.cn.

MeSH

Carbon DioxideCatalysisChromiumLightOxidation-ReductionWaste WaterWaterWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32828054

Citation

Liu, Xuefeng, et al. "Effective In-situ Reduction of Cr(VI) From Leather Wastewater By Advanced Reduction Process Based On CO2·- With Visible-light Photocatalyst." Chemosphere, vol. 263, 2021, p. 127898.
Liu X, Liu G, You S. Effective in-situ reduction of Cr(VI) from leather wastewater by advanced reduction process based on CO2·- with visible-light photocatalyst. Chemosphere. 2021;263:127898.
Liu, X., Liu, G., & You, S. (2021). Effective in-situ reduction of Cr(VI) from leather wastewater by advanced reduction process based on CO2·- with visible-light photocatalyst. Chemosphere, 263, 127898. https://doi.org/10.1016/j.chemosphere.2020.127898
Liu X, Liu G, You S. Effective In-situ Reduction of Cr(VI) From Leather Wastewater By Advanced Reduction Process Based On CO2·- With Visible-light Photocatalyst. Chemosphere. 2021;263:127898. PubMed PMID: 32828054.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effective in-situ reduction of Cr(VI) from leather wastewater by advanced reduction process based on CO2·- with visible-light photocatalyst. AU - Liu,Xuefeng, AU - Liu,Guoshuai, AU - You,Shijie, Y1 - 2020/08/12/ PY - 2020/05/08/received PY - 2020/07/16/revised PY - 2020/08/01/accepted PY - 2020/8/23/pubmed PY - 2020/8/23/medline PY - 2020/8/23/entrez KW - Black TiO(2) KW - Carboxyl dioxide anion radical KW - In-situ advanced reduction process KW - Leather wastewater KW - Visible light SP - 127898 EP - 127898 JF - Chemosphere JO - Chemosphere VL - 263 N2 - Advanced reduction process (ARP) has drawn an increasing interest as a new manner for removing oxidative pollutants in water. In this paper, we demonstrate the possibility of in-situ reduction of Cr(VI) by CO2·- produced from formate originally existing in leather wastewater by visible-light-driven ARP containing black TiO2 photocatalyst. The prepared black TiO2 with nanotube structure achieves remarkable enhanced the reduction rate of Cr(VI) as high as 96.2% (k = 0.0114 min-1) in the presence of formate, which is approximately 4.75 times than that of 56.3% (k = 0.0024 min-1) in the absence under 120 min visible-light irradiate at unadjusted pH. The results exhibit a distinct contrast with commercial TiO2 (P25). A series of control experiments are also performed, indicating that formate is able to convert the oxidative environment into a highly reductive one, and the formate concentration, black TiO2 dosage and pH may greatly impact on the Cr(VI) reduction rate. According to the electron spin resonance (ESR) measurement, CO2·- radicals can be directly verified as dominate radical in this system. Moreover, this system appears to be attractive for creating photochemical systems where in-situ production of CO2·- radicals may be realized by using formate. Then this in-situ ARP system will provide a new perspective for the Cr(VI) removing, which makes leather wastewater treatment much easier and more sustainable in the future. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32828054/Effective_in_situ_reduction_of_Cr_VI__from_leather_wastewater_by_advanced_reduction_process_based_on_CO2·__with_visible_light_photocatalyst_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(20)32093-2 DB - PRIME DP - Unbound Medicine ER -