Graphitic biochar catalysts from anaerobic digestion sludge for nonradical degradation of micropollutants and disinfection

Yi di Chen; Xiaoguang Duan; Chaofan Zhang; Shaobin Wang; Nan qi Ren; Shih Hsin Ho

doi:10.1016/j.cej.2019.123244

Graphitic biochar catalysts from anaerobic digestion sludge for nonradical degradation of micropollutants and disinfection

Yi di Chen
, Xiaoguang Duan
, Chaofan Zhang
, Shaobin Wang
, Nan qi Ren^*
, Shih Hsin Ho

^*Corresponding author for this work

School of Environment, Harbin Institute of Technology
Adelaide University

Research output: Contribution to journal › Article › peer-review

172 Scopus citations

Abstract

The peroxydisulfate (PDS) -based advanced oxidation processes (AOPs) is a promising technology for wastewater treatment and the efficiency primarily depends on the high-performance catalysts. Therefore, it is necessary to develop a green and low-cost biomaterial for PDS activation to drive such a process. In this study, biochar catalysts were produced via pyrolysis of anaerobic digestion sludge (ADS) as effective PDS activators. The biochar derived from ADS (ADSBC) yielded large specific surface areas, a high degree of graphitization and good conductivity, which can be used for effectively oxidizing various pollutants including dyes, estrogens and sulfonamides with PDS in broad pH and temperature ranges. It is showed that PDS activated by ADSBC 1000 can completely remove sulfathiazole in 90 min much higher than that of ADSBC 400 (20.25%). Moreover, the biochar produced under high pyrolysis temperature shows great stability and low biotoxicity due to the limited metals leaching and eliminated persistent free radicals as well as dissolved organic matter. The mechanism of the ADSBCs/PDS system was critically discussed via selectively radical screening tests, solvent exchange (H₂O to D₂O), selectivity to pollutants and electrochemical analysis. These results revealed that the organics were decomposed by a nonradical pathway via electron transfer rather than relying on free radicals or singlet oxygen. More importantly, the biochar-based nonradical oxidation system can leveraged for inactivation of Escherichia coli (E. coli) and diverse bacteria in both simulated and real wastewater. Therefore, this work not only provides an approach to reuse the sludge residue to prepare graphitic biochar catalysts as PDS activators for decontamination of emerging micropollutants, but also expands the practical application of advanced carbocatalysis for bacteria inactivation by nonradical oxidation in real wastewater.

Original language	English
Article number	123244
Journal	Chemical Engineering Journal
Volume	384
DOIs	https://doi.org/10.1016/j.cej.2019.123244
State	Published - 15 Mar 2020
Externally published	Yes

Keywords

Anaerobic digestion sludge
Bacteria inactivation
Biochar
Carbocatalysis
Nonradical
Peroxydisulfate

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10.1016/j.cej.2019.123244

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@article{b42a1d7faed7440b85d2a3dbb890bb5a,

title = "Graphitic biochar catalysts from anaerobic digestion sludge for nonradical degradation of micropollutants and disinfection",

abstract = "The peroxydisulfate (PDS) -based advanced oxidation processes (AOPs) is a promising technology for wastewater treatment and the efficiency primarily depends on the high-performance catalysts. Therefore, it is necessary to develop a green and low-cost biomaterial for PDS activation to drive such a process. In this study, biochar catalysts were produced via pyrolysis of anaerobic digestion sludge (ADS) as effective PDS activators. The biochar derived from ADS (ADSBC) yielded large specific surface areas, a high degree of graphitization and good conductivity, which can be used for effectively oxidizing various pollutants including dyes, estrogens and sulfonamides with PDS in broad pH and temperature ranges. It is showed that PDS activated by ADSBC 1000 can completely remove sulfathiazole in 90 min much higher than that of ADSBC 400 (20.25\%). Moreover, the biochar produced under high pyrolysis temperature shows great stability and low biotoxicity due to the limited metals leaching and eliminated persistent free radicals as well as dissolved organic matter. The mechanism of the ADSBCs/PDS system was critically discussed via selectively radical screening tests, solvent exchange (H2O to D2O), selectivity to pollutants and electrochemical analysis. These results revealed that the organics were decomposed by a nonradical pathway via electron transfer rather than relying on free radicals or singlet oxygen. More importantly, the biochar-based nonradical oxidation system can leveraged for inactivation of Escherichia coli (E. coli) and diverse bacteria in both simulated and real wastewater. Therefore, this work not only provides an approach to reuse the sludge residue to prepare graphitic biochar catalysts as PDS activators for decontamination of emerging micropollutants, but also expands the practical application of advanced carbocatalysis for bacteria inactivation by nonradical oxidation in real wastewater.",

keywords = "Anaerobic digestion sludge, Bacteria inactivation, Biochar, Carbocatalysis, Nonradical, Peroxydisulfate",

author = "Chen, \{Yi di\} and Xiaoguang Duan and Chaofan Zhang and Shaobin Wang and Ren, \{Nan qi\} and Ho, \{Shih Hsin\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

month = mar,

day = "15",

doi = "10.1016/j.cej.2019.123244",

language = "英语",

volume = "384",

journal = "Chemical Engineering Journal",

issn = "1385-8947",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Graphitic biochar catalysts from anaerobic digestion sludge for nonradical degradation of micropollutants and disinfection

AU - Chen, Yi di

AU - Duan, Xiaoguang

AU - Zhang, Chaofan

AU - Wang, Shaobin

AU - Ren, Nan qi

AU - Ho, Shih Hsin

PY - 2020/3/15

Y1 - 2020/3/15

N2 - The peroxydisulfate (PDS) -based advanced oxidation processes (AOPs) is a promising technology for wastewater treatment and the efficiency primarily depends on the high-performance catalysts. Therefore, it is necessary to develop a green and low-cost biomaterial for PDS activation to drive such a process. In this study, biochar catalysts were produced via pyrolysis of anaerobic digestion sludge (ADS) as effective PDS activators. The biochar derived from ADS (ADSBC) yielded large specific surface areas, a high degree of graphitization and good conductivity, which can be used for effectively oxidizing various pollutants including dyes, estrogens and sulfonamides with PDS in broad pH and temperature ranges. It is showed that PDS activated by ADSBC 1000 can completely remove sulfathiazole in 90 min much higher than that of ADSBC 400 (20.25%). Moreover, the biochar produced under high pyrolysis temperature shows great stability and low biotoxicity due to the limited metals leaching and eliminated persistent free radicals as well as dissolved organic matter. The mechanism of the ADSBCs/PDS system was critically discussed via selectively radical screening tests, solvent exchange (H2O to D2O), selectivity to pollutants and electrochemical analysis. These results revealed that the organics were decomposed by a nonradical pathway via electron transfer rather than relying on free radicals or singlet oxygen. More importantly, the biochar-based nonradical oxidation system can leveraged for inactivation of Escherichia coli (E. coli) and diverse bacteria in both simulated and real wastewater. Therefore, this work not only provides an approach to reuse the sludge residue to prepare graphitic biochar catalysts as PDS activators for decontamination of emerging micropollutants, but also expands the practical application of advanced carbocatalysis for bacteria inactivation by nonradical oxidation in real wastewater.

AB - The peroxydisulfate (PDS) -based advanced oxidation processes (AOPs) is a promising technology for wastewater treatment and the efficiency primarily depends on the high-performance catalysts. Therefore, it is necessary to develop a green and low-cost biomaterial for PDS activation to drive such a process. In this study, biochar catalysts were produced via pyrolysis of anaerobic digestion sludge (ADS) as effective PDS activators. The biochar derived from ADS (ADSBC) yielded large specific surface areas, a high degree of graphitization and good conductivity, which can be used for effectively oxidizing various pollutants including dyes, estrogens and sulfonamides with PDS in broad pH and temperature ranges. It is showed that PDS activated by ADSBC 1000 can completely remove sulfathiazole in 90 min much higher than that of ADSBC 400 (20.25%). Moreover, the biochar produced under high pyrolysis temperature shows great stability and low biotoxicity due to the limited metals leaching and eliminated persistent free radicals as well as dissolved organic matter. The mechanism of the ADSBCs/PDS system was critically discussed via selectively radical screening tests, solvent exchange (H2O to D2O), selectivity to pollutants and electrochemical analysis. These results revealed that the organics were decomposed by a nonradical pathway via electron transfer rather than relying on free radicals or singlet oxygen. More importantly, the biochar-based nonradical oxidation system can leveraged for inactivation of Escherichia coli (E. coli) and diverse bacteria in both simulated and real wastewater. Therefore, this work not only provides an approach to reuse the sludge residue to prepare graphitic biochar catalysts as PDS activators for decontamination of emerging micropollutants, but also expands the practical application of advanced carbocatalysis for bacteria inactivation by nonradical oxidation in real wastewater.

KW - Anaerobic digestion sludge

KW - Bacteria inactivation

KW - Biochar

KW - Carbocatalysis

KW - Nonradical

KW - Peroxydisulfate

UR - https://www.scopus.com/pages/publications/85073950435

U2 - 10.1016/j.cej.2019.123244

DO - 10.1016/j.cej.2019.123244

M3 - 文章

AN - SCOPUS:85073950435

SN - 1385-8947

VL - 384

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

M1 - 123244

ER -

Graphitic biochar catalysts from anaerobic digestion sludge for nonradical degradation of micropollutants and disinfection

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