Journal
CHEMOSPHERE
Volume 303, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.135233
Keywords
Wastewater treatment; Sulfate removal; Activated biochar; Adsorption kinetics; Chemisorption
Categories
Funding
- National Natural Science Foundation of China [41877478]
- Fundamental Research Funds for the Central Universities (China University of Geosciences (Wuhan)) [CUGGC06]
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Biochar, impregnated with iron oxide and loaded with barium, was found to be an effective adsorbent for the removal of SO42- from aqueous solutions. Experimental results showed a removal efficacy of 96.7% under optimal conditions. Kinetic analysis confirmed chemisorption as the main removal mechanism.
Biochar is a low-cost adsorbent used in the treatment of contaminated wastewater. We investigated the potential of an Fe-impregnated, Ba2+-loaded biochar (Fe-(Ba-BC)) for the removal of SO42- from aqueous solutions. The Ba2+-loaded biochar was synthesized from sawdust impregnated with iron oxide via pyrolysis at 600 degrees C. The porous structure of the Fe-(Ba-BC) was identified by scanning electron microscopy before sulfate was adsorbed onto the adsorbent. Functional groups were determined by energy-dispersive spectrophotometry and Raman spectrometry.. The Fe-(Ba-BC) Raman peaks before the experiment were higher than after, suggesting the precipitation of BaSO4. The presence of BaCl2 on the surface of the biochar was confirmed by X-ray diffraction. Batch sorption results showed that Fe-(Ba-BC) strongly adsorbed aqueous SO42- with a removal efficacy of 96.7% under the optimum conditions of 0.25 M BaCl2, a contact time of 480 min, a pH of 9 and an adsorbent dose of 2 g. The optimum condition for removal and reaction rate kinetics analysis indicated that adsorption curve fitted well with PSO, k(2) 0.00015 confirmed the removal of SO42- via chemisorption. Thus, Fe-(Ba-BC) was found to be a favorable adsorbent for removing SO42-.
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