Fabrication and characterization of a novel Ba2+-loaded sawdust biochar doped with iron oxide for the super-adsorption of SO42− from wastewater
2022
Khalid, Warda | Cheng, Chin Kui | Liu, Peng | Tang, Jinping | Liu, Xin | Ali, Asmat | Shahab, Asfandyar | Wang, Xingjie
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 °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, k₂ 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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