Effectiveness and mechanisms of phosphate adsorption on iron-modified biochars derived from waste activated sludge

被引：353

作者：

Yang, Qi ^{[1
,2
]}

Wang, Xiaolin ^{[1
,2
]}

Luo, Wei ^{[3
]}

Sun, Jian ^{[1
,2
]}

Xu, Qiuxiang ^{[1
,2
]}

Chen, Fei ^{[1
,2
]}

Zhao, Jianwei ^{[1
,2
]}

Wang, Shana ^{[1
,2
]}

Yao, Fubing ^{[1
,2
]}

Wang, Dongbo ^{[1
,2
]}

Li, Xiaoming ^{[1
,2
]}

Zeng, Guangming ^{[1
,2
]}

机构：

[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China

[2] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China

[3] Hunan Univ, Modern Engn Training Ctr, Changsha 410082, Hunan, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2018年 / 247卷

基金：

中国国家自然科学基金;

关键词：

Adsorption; Biochar; FeCl3-impregnation; Phosphate; Waste activated sludge; PHOSPHORUS REMOVAL; AQUEOUS-SOLUTIONS; MICROBIAL COMMUNITY; PARTICLE-SIZE; PEANUT HULL; WATER; CARBON; OXIDE; HYDROXIDE; TAILINGS;

D O I：

10.1016/j.biortech.2017.09.136

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Excessive discharge of phosphate (P) into the surface water is the key factor to cause the eutrophication, so its removal has aroused much attention in recent years. In this study, different iron modification (chemical coprecipitation of Fe3+ /Fe2+ or FeCl3 impregnation) was used to improve the phosphate adsorption capacity of waste activated sludge (WAS)-based biochar. Comparative tests demonstrated that the FeCl3-impregnated WAS-based biochar exhibited much superior phosphate adsorption capacity (111.0 mg/g) in all as-prepared samples and performed well even under the interferences with pH and coexisting ions. X-ray diffraction (XRD) analyzes indicated that the iron in FeCl3-impregnated WAS-based biochar existed mainly in amorphous phase, as hematite and amorphous hydroxides forms, which was of great benefit to the phosphate adsorption. Besides, ligand exchange plays important role in the adsorption of phosphate. The WAS-based biochar kept over 60% phosphate removal efficiency after five recycles.

引用

页码：537 / 544

页数：8

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