Effect of Fe-N modification on the properties of biochars and their adsorption behavior on tetracycline removal from aqueous solution

被引：314
作者：
Mei, Yanglu [1 ]
Xu, Jin [1 ]
Zhang, Yin [1 ]
Li, Bin [1 ]
Fan, Shisuo [1 ]
Xu, Huacheng [2 ]
机构：
[1] Anhui Agr Univ, Sch Resources & Environm, Hefei 230036, Peoples R China
[2] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2021年 / 325卷
基金：
中国国家自然科学基金;
关键词：
Rice straw; Biochar; Fe-N modifcation; Tetracycline; Adsorption mechanism; MAGNETIC BIOCHAR; RICE STRAW; REDUCTION REACTION; EFFICIENT REMOVAL; MESOPOROUS CARBON; METHYLENE-BLUE; SEWAGE-SLUDGE; CO-PYROLYSIS; BIOMASS; MECHANISM;
D O I：
10.1016/j.biortech.2021.124732
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Tetracycline (TC) adsorption capacity on pristine biochar was limited. Biochar modification can greatly improve its adsorption amount. In this study, rice straw was mixed with FeCl3 center dot 6H(2)O and urea to prepare a Fe-N modified biochar via a one-pot pyrolysis method at 700 degrees C. Meanwhile, pristine biochar (RSBC), urea modified biochar (N-RSBC), FeCl3 center dot 6H(2)O-modified biochar (Fe-RSBC) were produced as control. More functional groups, more graphited carbon structure, and magnetic components were observed in Fe-N-RSBC. Compared with RSBC, the surface area, total pore and micropore volume of Fe-N-RSBC increased 3.4-fold, 3.0-fold and 2.3-fold, respectively. The maximum capacity of TC adsorption on Fe-N-RSBC reached 156 mg.g(-1), which was 5.4 - fold, 8.2 - fold and 1.9 - fold increase to that of RSBC, N-RSBC, Fe-RSBC, respectively. The mechanism of TC adsorption on Fe-N-RSBC involved pore filling, hydrogen-bond interaction, surface complexation, and pi-pi interaction. Therefore, Fe-N-RSBC can be used as an effective adsorbent for TC removal from aqueous solution.
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页数：12
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