期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 304, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2021.114297
关键词
Waterworks sludge; Biochar; Adsorption; Methylene blue; Fe/Si extraction
资金
- Everest Discipline Construction Project of Tibet University [ZF21000002]
- Tibet University 2019 Central Financial Support Special Funds for Local Colleges and Universities [19]
- Cultivation Foundation of Tibet University [ZDTSJH18-04]
A magnetic nitrogen-doped sludge-based biochar (NAlSB-Fe-Si) was prepared from waterworks sludge and dicyandiamide, which showed good adsorption performance for methylene blue. The loading of magnetic particles increased the specific surface area of the adsorbent, and an alkaline environment was found to be favorable for the rapid removal of methylene blue.
A magnetic nitrogen-doped sludge-based biochar (NAlSB-Fe-Si) was prepared based on waterworks sludge for raw material and dicyandiamide for nitrogen source to adsorb methylene blue (MB) from water. And the magnetic particles loaded on the adsorbent were obtained through functionalizing iron and silicon ions which were extracted from the biochar by acid and alkali impregnation. Physicochemical properties of sludge-based biochar (SB) were analyzed by SEM, BET, FTIR, XRD, XPS and VSM. Compared with the original biochar, NAlSB-Fe-Si had richer pore structure and higher pore volume, and the SiO2 and Fe3O4 loading made the specific surface area increased by 200%. Possible adsorption mechanism was proposed by exploring the initial pH, MB concentration and reaction time. Results revealed that alkaline environment was more conducive to the rapid removal of cationic dyes such as MB. Pseudo-second-order kinetic model and intra-particle diffusion model could describe the adsorption behavior of MB on NAlSB-Fe-Si. The fitting results of Langmuir model showed that adsorption temperature is positively correlated with adsorption capacity, and the maximum adsorption capacity of MB on nitrogen-doped sludge-based biochar (NSB) and NAlSB-Fe-Si at 25 degrees C was 26.47 and 300.36 mg/g, respectively. Finally, the MB removal rate of NAlSB-Fe-Si could still reach 70% after four cycles, indicating that the composite was an efficient cationic dye adsorbent, and its preparation could be regarded as a way of resource utilization of waterworks sludge.
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