Modification of sludge-based biochar and its application to phosphorus adsorption from aqueous solution

被引：38
作者：
Li, Zhiwei [1 ]
Liu, Xuejiao [1 ]
Wang, Yin [1 ]
机构：
[1] Chinese Acad Sci, CAS Key Lab Urban Pollutant Convers, Inst Urban Environm, Xiamen 361021, Fujian, Peoples R China
来源：
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT | 2020年 / 22卷 / 01期
关键词：
Sewage sludge; Biochar; Modification; Phosphorus; Adsorption; PHOSPHATE ADSORPTION; SEWAGE-SLUDGE; WASTE-WATER; ACTIVATED CARBON; HEAVY-METALS; IRON-OXIDE; REMOVAL; DESORPTION; ZIRCONIUM; OXIDATION;
D O I：
10.1007/s10163-019-00921-6
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Sludge-based biochar was first modified for the adsorption of phosphorus from aqueous solution. This study is to modify sludge-based biochar (SBC) via peroxidation with nitric acid and impregnation with ferrous ions to obtain a high adsorption capacity for phosphorus (P). The P adsorption capacity of the modified sludge biochar (M-SBC) was increased to 9.79 mg/g, a value almost 40 times higher than that of the original biochar. Among the adsorption parameters studied, pH was found to be particularly important to P adsorption. After modification, the point of zero charge of the M-SBC occurred at pH 6. The isotherms of P adsorption on M-SBC obeyed the Freundlich equation. An analysis of the adsorption thermodynamics indicated that the process of P adsorption on M-SBC was spontaneous and endothermic, increased the degree of disorder, and involved chemisorption. The main mechanisms of P adsorption were surface precipitation and electrostatic attraction.
引用
收藏
页码：123 / 132
页数：10
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