期刊
BIORESOURCE TECHNOLOGY
卷 321, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124413
关键词
Sludge-based biochar; Hydroxyapatite; Adsorption behavior; Mechanisms; Heavy metals
资金
- National Natural Science Foundation of China [51979104]
- Training Program for Excellent Young Innovators of Changsha [kq1802010, kq1802040]
- Science and Technology Planning Project of Hunan Province [2018RS3109]
- Natural Science Foundation of Hunan Province, China [2020JJ5019]
The study utilized HAP-modified biochar (HAP-SSBC) for Cu2+ and Cd2+ adsorption, showing superior performance and offering a new approach for heavy metal removal.
This study prepared sewage sludge, a municipal solid waste, into a biochar modified by hydroxyapatite (HAP) as a new and efficient absorbent (HAP-SSBC) for removal of Cu2+ and Cd2+ from aqueous solution. Adsorption experiment revealed that HAP-SSBC exhibited significantly higher adsorption performance than raw sludge-based biochar (SSBC). At 298.15 K, the maximum adsorption capacity of Cu2+ and Cd2+ via Langmuir model were 89.98 and 114.68 mg/g, respectively. Adsorption kinetic experiment revealed that chemisorption was the main reaction. Analysis of X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectrum (XPS) further confirmed that the main mechanisms were ion exchange with Ca2+, complexion by -OH and -COOH, and forming Cu-pi or Cd-pi binding with aromatic C=C on HAP-SSBC surface. Overall, combing HAP and SSBC to be a new adsorbent is beneficial to the resource utilization of sludge and shows a good prospect for heavy metal removal in aqueous solution.
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