Alizarin red removal using Palladium nano particles : kinetic and isotherm study

In this study, Alizarin red was removed from aqueous solution by Palladium nano particles and determined by UV-VIS spectroscopy.In this regard, the influence of variablessuch as amount of Palladium nano particles, pH, stirring time, and initial dye concentrationon the procedure efficiency was examined and optimized. At optimum value of all variables, high adsorption capacity (357.14 mg g−1) indicates the efficiency and suitability of Palladium nano particles for achievement a safe and clean environment. The initial pH has significant roleon the chemistry of dye molecules and adsorbent, and the best pH was 5.0. The removalrates follow the pseudo-second order in cooperate with interparticle diffusion models. The correlation coefficients were in the range of 0.9987–0.9998. The high adsorption capacitiesmake Palladium nano particles superior to activated carbon and admit to design safe, economic, and nontoxicwastewater treatment technology. The pH of zero charge of Palladium nano particles was around 1.0. The higher the fraction of mesopores with size between 10 and 50 nm lead to enhance inthe rate and amount of dyes adsorbed on its surface. Fitting the equilibrium adsorption databy Langmuir and Freundlich models shows that experimental data well explained by the Langmuir equation.

کلیدواژه ها:

Alizarin red Palladium nano particles ، Kinetics and isotherm study ، uv-vis spectroscopy