Enhanced Cu2+ and Cd2+ removal by a novel co-pyrolysis biochar derived from sewage sludge and phosphorus tailings: adsorption performance and mechanisms

被引：2
作者：
Zeng, Yifan [1 ]
Xu, Zuxin [1 ]
Dong, Bin [1 ]
机构：
[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China
来源：
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH | 2024年 / 46卷 / 10期
关键词：
Co-pyrolysis biochar; Sewage sludge; Phosphorus tailings; Heavy metal adsorption; HEAVY-METAL POLLUTION; COMPETITIVE ADSORPTION; CHINA POLLUTION; HYDROXYAPATITE; PHOSPHATE; BEHAVIOR; CU(II); PB(II); WATER; IONS;
D O I：
10.1007/s10653-024-02186-x
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The reutilization of municipal wastes has always been one of the hottest subjects of sustainable development study. In this study, a novel biochar co-pyrolyzed from municipal sewage sludge and phosphorus tailings was produced to enhance the adsorption performance of the composite on Cu2+ and Cd2+. The maximum Cu2+ and Cd2+ adsorption capacity of SSB-PT were 44.34 and 45.91 mg/g, respectively, which were much higher than that of sewage sludge biochar (5.21 and 4.58 mg/g). Chemisorption dominated the whole adsorption process while multilayer adsorption and indirect interaction were also involved. According to the result of X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectrum (XPS), the load of CO32-, Mg2+, and Ca2+ on the surface of SSB-PT enhanced the precipitation and ion exchange effect. Posnjakite and CdCO3 were formed after the adsorption of Cu2+ and Cd2+, respectively. Besides, complexation, and metal-pi interaction were also involved during the adsorption process. Therefore, this study offered a promising method to reuse sewage sludge and phosphorus tailings as an effective adsorbent.
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页数：16
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