Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 380, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.120872
Keywords
Acid orange II; Methylene blue; zeta potential; Adsorption mechanism; Computational studies
Categories
Funding
- FAPEMIG
- CNPq
- TWAS-CNPq
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Brasil (CAPES) [001]
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Spray dried cross-linked chitosan/cobalt ferrite composite was synthesized and applied as an adsorbent for the removal of acid orange II and methylene blue. The composite was structurally, thermally, morphologically and magnetically characterized. The result obtained shows that the magnetic composite was in form of microspheres, while cobalt ferrite was encapsulated in the cross-linked chitosan with saturation magnetization of 10.79 emu g(-1). Adsorption studies revealed that acid orange II adsorbed more favorably on the composite than methylene blue. The adsorption process is spontaneous and exothermic. Liu isotherm model was found to be applicable for the adsorption process. Computational studies showed that the formation of hydrogen bond between acid orange II and the magnetic composite (at both acidic and alkaline pH) contributed to its better adsorption than methylene blue. Adsorption capacity of acid orange II at pH 3 and methylene blue at pH 12 are 542 and 173 mg g(-1) respectively at 303 K base on Liu isotherm model.
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