出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：One of the contaminants in the wastewater of the electroplating industry is Cr (VI). In this study,the magnetic adsorbent of CoFe2O4 which was coated with polyethylene glycol (PEG)-4000 wassynthesized and used to removal of Cr (VI) from electroplating wastewater. The adsorbent obtainedwas characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), DispersiveEnergy X-Ray Spectrometer (EDS) and Vibrating Sample Magnetometer (VSM). The adsorptionprocess was studied by the variable of the effects of the solution pH, contact time and weight ofthe adsorbent. Langmuir and Freundlich isotherm models were used to describe the interactionbetween the adsorbate and adsorbent. The kinetics and thermodynamics were used to determinethe mechanism of adsorption. The results of the study showed that optimum condition for removalof Cr (VI) onto CoFe2O4 and CoFe2O4-PEG at pH 3 with contact time 35 minutes and weight ofadsorbent 0.1 g. The adsorption process was in accordance with Langmuir’s isotherm with maximumadsorption capacity using CoFe2O4 and CoFe2O4-PEG of 40.983 and 42.107 mg/g, respectively.The kinetics of the reaction of both adsorbents corresponded to the pseudo second-order.The value of the negative free energy (ΔG0) indicated that the reaction occurred spontaneously.The efficiency for removal of Cr (VI) from the electroplating wastewater by CoFe2O4 andCoFe2O4-PEG was 68.48% and 73.39%, respectively.
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