Tuning oxygenated functional groups on biochar for water pollution control: A critical review

被引：177
作者：
Dai, Lichun [1 ]
Lu, Qian [1 ]
Zhou, Haiqin [1 ]
Shen, Fei [2 ]
Liu, Zhengang [3 ]
Zhu, Wenkun [4 ]
Huang, Huagang [5 ]
机构：
[1] Minist Agr & Rural Affairs, Biogas Inst, Key Lab Dev & Applicat Rural Renewable Energy, Chengdu 610041, Peoples R China
[2] Sichuan Agr Univ, Inst Ecol & Environm Sci, Chengdu 611130, Peoples R China
[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China
[4] Southwest Univ Sci & Technol, State Key Lab Environm Friendly Energy Mat, Natl Coinnovat Ctr Nucl Waste Disposal & Environm, Sch Natl Def Sci & Technol,Nucl Waste & Environm, Mianyang 621010, Sichuan, Peoples R China
[5] Sichuan Agr Univ, Coll Resources, Chengdu 611130, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 420卷
基金：
中国国家自然科学基金;
关键词：
Biochar; Oxygenated functional group; Water pollution control; Adsorption; Redox reaction; PERSISTENT FREE-RADICALS; CALCIUM-RICH BIOCHAR; HYDROTHERMAL CARBONIZATION; ACTIVATED CARBON; PHENANTHRENE SORPTION; SURFACE MODIFICATION; CHEMICAL OXIDATION; AIR OXIDATION; CRAB SHELL; ADSORPTION;
D O I：
10.1016/j.jhazmat.2021.126547
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Biochar has attracted increasing attention in water pollution control, attributed to its various merits, e.g., tunable physico-chemical properties. The oxygenated functional groups (OFGs) on biochar are key active sites for removing pollutants from water through interfacial adsorption/redox reaction. However, there is still a lack of comprehensive knowledge and perspective on tuning OFGs on biochar for enhanced performance in water pollution control. Here, this review highlighted the mechanisms of biochar OFGs in water pollution control, analyzed the strategies and mechanisms for tuning OFGs on biochar, and investigated the performances of biochars with tuned OFGs in removing inorganic/organic pollutants via adsorption/redox reactions. Specifically, strategies for tuning OFGs on biochar are far more than the well-recognized ex-situ oxidation of pristine biochar. These strategies include in-situ low temperature preservation of hydroxyl and carboxyl, in-/ex-situ oxidation of biochar, and in-/ex-situ grafting of carboxyl on biochar via cycloaddition/acylation reaction. The resultant biochars showed enhanced performances in adsorption (mainly mediated by hydroxyl, carboxyl and ketone through surface complexation, H-bonding, and electrostatic attraction) and redox reaction (mainly mediated by redox-active hydroxyl and ketone). Finally, this review presented future directions on developing biochar with specially tuned surface OFGs as a sustainable high-performance adsorbent/carbocatalyst for water pollution control.
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页数：13
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