Journal
ENVIRONMENTAL RESEARCH
Volume 191, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.110104
Keywords
Antibiotic; Exothermic process; Biochar; Phosphoric acid activation; Regeneration
Funding
- National Natural Science Foundation of China [21908134]
- Natural Science Foundation of Shandong Province [ZR2019BB045]
- Shandong Province Major Science and Technology Innovation Projects [2018CXGC1011]
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Phosphoric acid is used to in-situ activate biochar pymlyzed by cotton shells to enhance the adsorption ability of sulfadiazine (SDZ). To confirm the optimum condition, different impregnation ratios and impregnation times were investigated. It was found that the biochar (BC) pyrolyzed under the condition of an impregnation ratio of 2.5 and an impregnation time of 6 h showed the highest performance for the removal of SDZ. The maximum adsorption ability was 86.89 mg/g at a temperature of 298 K. The pseudo-second-order model was used to disclose the adsorption process of SDZ by BCs. The experimental data were described by the Langmuir and Temkin isotherms at different temperatures. It was found that the sorption of SDZ was an exothermic process according to the thermomechanical analysis. The activated BC could be recycled for at least five times with a high removal rate of SDZ. Thus, activated BCs are regarded as promising adsorbents for SDZ removal.
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