Decontamination of Cr(VI) facilitated formation of persistent free radicals on rice husk derived biochar

doi:10.1007/s11783-019-1106-7

Front. Environ. Sci. Eng.

2019, Vol. 13

Issue (2) : 22 https://doi.org/10.1007/s11783-019-1106-7

RESEARCH ARTICLE

Decontamination of Cr(VI) facilitated formation of persistent free radicals on rice husk derived biochar

Kaikai Zhang, Peng Sun, Yanrong Zhang(

)

School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

PFRs were produced on biochar during Cr(VI) decontamination.

PFRs formation on biochar was owing to the oxidization of phenolic-OH by Cr(VI).

Appearance of excessive oxidant led to the consumption of PFRs on biochar.

Biochar charred at high temperature possessed great performance to Cr(VI) removal.

This study investigated the facilitation of Cr(VI) decontamination to the formation of persistent free radicals (PFRs) on rice husk derived biochar. It was found that Cr(VI) remediation by biochar facilitated the production of PFRs, which increased with the concentration of treated Cr(VI). However, excessive Cr(VI) would induce their decay. Biochar with high pyrolysis temperature possessed great performance to Cr(VI) removal, which was mainly originated from its reduction by biochar from Inductively Coupled Plasma Optical Emission Spectroscopy and X-ray Photoelectron Spectroscopy. And the corresponding generation of PFRs on biochar was primarily ascribed to the oxidization of phenolic hydroxyl groups by Cr(VI) from Fourier Transform Infrared Spectroscopy analysis, which was further verified by the H₂O₂ treatment experiments. The findings of this study will help to illustrate the transformation of reactive functional groups on biochar and provide a new insight into the role of biochar in environmental remediation.

Keywords Biochar Persistent free radicals Phenolic hydroxyl groups Cr(VI) reduction

Corresponding Author(s): Yanrong Zhang

Issue Date: 18 February 2019

Cite this article:

Kaikai Zhang,Peng Sun,Yanrong Zhang. Decontamination of Cr(VI) facilitated formation of persistent free radicals on rice husk derived biochar[J]. Front. Environ. Sci. Eng., 2019, 13(2): 22.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1106-7
https://academic.hep.com.cn/fese/EN/Y2019/V13/I2/22

Fig.1 FTIR (a) and EPR (b) spectra of biochar.

Fig.2 EPR signals for biochar upon different concentration of Cr(VI) treatment for R350 (a), R450 (b) and R550 (c), and the change of PFRs contents varied from Cr(VI) concentration (d). Reaction condition: [biochar] = 10 g/L, pH= 3, [Reaction time] = 48 h, the initial concentration of Cr(VI) variation from 0 to 50 mg/L, the ratio between solid and solution was 1:100.

Fig.3 (a) Removal content of Cr (VI) in biochar suspension with different initial concentration of Cr(VI). Reaction condition: [biochar] = 10 g/L, pH= 3, [Reaction time] = 48 h, the initial concentration of Cr(VI) varied from 2 to 50 mg/L. (b) Cr(VI) removal kinetics in biochar suspension. Reaction condition: [biochar] = 10 g/L, [Cr(VI)]₀ = 50 mg/L, pH= 3.

Fig.4 XPS spectra of Cr adsorbed on biochar for R350 (a), R450 (b) and R550 (c). (d) Contents of Cr(VI) and Cr(III) in biochar suspension upon Cr(VI) treatment. Reaction condition: [biochar] = 10 g/L, [Cr(VI)]₀ = 50 mg/L, pH= 3, [Reaction time] = 7 h, the ratio between solid and solution was 1:100.

Fig.5 FTIR spectra of biochar upon Cr(VI) treatment for R350 (a), R450 (b) and R550 (c) upon Cr(VI) treatment. Reaction condition: [biochar] = 10 g/L, [Cr(VI)]₀ = 50 mg/L, pH= 3, [Reaction time] = 7 h, the ratio between solid and solution was 1:100.

Fig.6 EPR signals (a) and FTIR spectra (b) for R550 upon different concentration of H₂O₂ treatment.

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