Kinetics, Thermodynamics and Isotherm studies on Adsorption of Eriochrome Black-T from aqueous solution using Rutile TiO2

International Conference on Advances in Materials and Manufacturing Applications 2017

Priyadarshini, B.^1 ; Rath, P.P.^1 ; Behera, S.S.^1 ; Panda, S.R.^1 ; Sahoo, T.R.^1 ; Parhi, P.K.^1

Department of Chemistry, School of Applied Sciences, KIIT University, Odisha, Bhubaneswar, India^1

关键词: Adsorption process;    Coprecipitation method;    Eriochrome black T;    Initial dye concentration;    Intraparticle diffusion equation;    Intraparticle diffusion models;    Linear relationships;    Pseudo second order;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012051/pdf
DOI  :  10.1088/1757-899X/310/1/012051

来源: IOP

【 摘 要 】

In this study, rutile phase of TiO2particles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic azo dye Eriochrome black-T (EBT) from aqueous solution. The rutile phase of TiO2was confirmed by the X-ray powder diffraction pattern. Effect of initial dye concentration, adsorbent dose, pH, agitation speed and temperature on the adsorption process of EBT was examined. Removal of EBT was increased by increasing in adsorbent dose and decrease in initial dye concentration and pH. The optimum conditions resulted were: 25 ppm initial dye concentration, 20 mg adsorbent dose and pH of 2. Using Langmuir, Freundlich and Temkin isotherm models, equilibrium data was determined. The Freundlich model showed the best fit for uptake of the EBT dye, which evident that the process of adsorption of EBT dye onto TiO2particles was heterogeneous. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equation. The pseudo-second order showed the best fit for the kinetic studies (R2= 0.999), which ascertains that the adsorption process was of chemisorptions type. The intraparticle diffusion model indicated a linear relationship (R2= 0.99) suggesting the pore diffusion to be a limiting step in the overall adsorption process.