Abstract
Methylene blue (MB) is one of the most dangerous dyes found in numerous industries’ wastewaters. Thus, the effect of suspended Pt nanoparticles (NPs) on the adsorption capability of TiO2 NPs towards MB was investigated in this research. Factors affecting (adsorbate initial concentration, agitation time, solution pH, and temperature) the adsorption capacity of MB on the modified TiO2 NPs were also studied. It was found that the first two factors have a positive effect, the temperature has an adverse impact, and the maximum uptake was observed when pH is 11. Isotherm parameters of Langmuir, Freundlich, and Timken models were determined. Langmuir’s model was found to be the best one for analyzing the experimental data. The adsorption capacities obtained were 100.61, 90.66, and 80.26 mg g−1 at 25 °C, 40 °C, and 55 °C, respectively. 1st order, 2nd order, and intra-particle diffusion kinetic models were utilized to analyze experimental data. It found that these data were explained well by the 2nd order model, indicating that this adsorption is chemisorption. Thermodynamic parameters were also determined, and the results obtained suggest that this adsorption is an exothermic and spontaneous process. The findings show that TiO2 NPs modified by suspended Pt NPs will get a strong attraction in the treatment of fluids and wastewaters.
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