Activation of percarbonate by water treatment sludge-derived biochar for the remediation of PAH-contaminated sediments

被引：73
作者：
Hung, Chang-Mao [1 ]
Huang, Chin-Pao [2 ]
Chen, Chiu-Wen [1 ]
Wu, Chung-Hsin [3 ]
Lin, Yi-Li [4 ]
Dong, Cheng-Di [1 ]
机构：
[1] Natl Kaohsiung Univ Sci & Technol, Dept Marine Environm Engn, Kaohsiung, Taiwan
[2] Univ Delaware, Dept Civil & Environm Engn, Newark, DE USA
[3] Natl Kaohsiung Univ Sci & Technol, Dept Chem & Mat Engn, Kaohsiung, Taiwan
[4] Natl Kaohsiung Univ Sci & Technol, Dept Safety Hlth & Environm Engn, Kaohsiung, Taiwan
来源：
ENVIRONMENTAL POLLUTION | 2020年 / 265卷
关键词：
Biochar; Percarbonate; Polycyclic aromatic hydrocarbon (PAH); Pyrolysis; Sludge; POLYCYCLIC AROMATIC-HYDROCARBONS; PERSISTENT FREE-RADICALS; SODIUM PERCARBONATE; AQUEOUS-SOLUTION; METHYLENE-BLUE; PYROLYSIS TEMPERATURE; MARINE-SEDIMENTS; FACILE SYNTHESIS; BAMBOO BIOCHAR; DEGRADATION;
D O I：
10.1016/j.envpol.2020.114914
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Sludge from a groundwater treatment plant was used to prepare biochar by pyrolysis. The Fe-Mn rich biochar was used to activate percarbonate for the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated aquatic sediments. Results showed that the sludge-derived biochar (SBC) produced at a pyrolysis temperature of 700 degrees C was the most effective in activating percarbonate, which exhibited significant oxidative removal of PAHs. PAHs degradation took place via a Fenton-like oxidation manners, contributed from the Fe3+/Fe2+ and Mn3+/Mn2+ redox pairs, and achieved the highest degradation efficiency of 87% at pHo 6.0. Reactions between oxygenated functional groups of biochar and H2O2 generated of O-2(center dot-) and HO center dot radicals in abundance under neutral and alkaline pH was responsible for the catalytic degradation of PAHs. Our results provided new insights into the environmental applications of SBC for the green sustainable remediation of organics-contaminated sediments and aided in reduction of associated environmental and health risk. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：10
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