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Fe-TiO2/AC and Co-TiO2/AC Composites: Novel Photocatalysts Prepared from Waste Streams for the Efficient Removal and Photocatalytic Degradation of Cibacron Yellow F-4G Dye
Journal Contribution - Journal Article
Fe-TiO2/AC and Co-TiO2/AC composites were prepared from activated carbon (AC)derived from residues of peanut hulls and TiO2 photocatalyst, electrochemically prepared fromtitanium scrap, and doped with Fe and Co, respectively. The adsorption capacity and photocatalyticactivity of the Fe-TiO2/AC and Co-TiO2/AC composites were studied for removing and degradingCibacron Yellow F-4G (CYF-4G) from wastewater. Doped ACs were characterized by thermogravimetric (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), a new X-ray absorptiontechnique (XRA), and elemental analysis (EA). Interesting relationships were found between SEM,XRA, and TGA data and the doped amount of catalyst on ACs. Optimal dye adsorption was foundat a pH of 2.0. The CYF-4G adsorption kinetics are followed according to the pseudo-second ordermodel. The experimental data revealed that the Langmuir model fit better than the Freundlich andTemkin models. A decrease in adsorption capacity was observed when the catalyst dope percentageincreased. A removal and degradation efficiency of the dye close to 100% was achieved around120 min. A synergistic adsorption and photocatalytic degradation effect of the Fe-TiO2/AC andCo-TiO2/AC composites could be observed when adsorption experiments were conducted undersimulated visible radiation.
Keywords:peanut hull, Physical chemistry