Adsorptive removal of Congo Red dye from aqueous solution using TiO2 nanoparticles: Kinetics, thermodynamics and isothermal insights

DAE SOLID STATE PHYSICS SYMPOSIUM 2018 Pub Date : 2019-07-12 DOI:10.1063/1.5112954

P. Rath, B. Priyadarshini, S. S. Behera, P. Parhi, S. R. Panda, T. Sahoo

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引用次数: 10

Abstract

TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.

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用TiO2纳米颗粒吸附去除刚果红染料:动力学，热力学和等温观察

采用共沉淀法合成了TiO2纳米颗粒，并将其作为吸附剂用于脱除有毒刚果红染料。用x射线粉末衍射图对所制得的TiO2进行了表征，证实了TiO2纳米颗粒为金红石相。采用Langmuir等温线和Freundlich等温线评价吸附平衡数据。采用伪一阶、伪二阶和粒子内扩散方程对动力学数据进行了分析。动力学结果表明，CR的吸附为准二级化学吸附型。计算了ΔG°、ΔH°和ΔS°等热力学参数，ΔH°(2.64 kJmol−1)的正值表示吸附过程的吸热性质，ΔS°(0.162 Jmol−1 K−1)的正值表示吸附过程中染料的随机性增加。采用共沉淀法合成了TiO2纳米颗粒，并将其作为吸附剂用于脱除有毒刚果红染料。用x射线粉末衍射图对所制得的TiO2进行了表征，证实了TiO2纳米颗粒为金红石相。采用Langmuir等温线和Freundlich等温线评价吸附平衡数据。采用伪一阶、伪二阶和粒子内扩散方程对动力学数据进行了分析。动力学结果表明，CR的吸附为准二级化学吸附型。计算了ΔG°、ΔH°和ΔS°等热力学参数，ΔH°(2.64 kJmol−1)的正值表示吸附过程的吸热性质，ΔS°(0.162 Jmol−1 K−1)的正值表示吸附过程中染料的随机性增加。

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DAE SOLID STATE PHYSICS SYMPOSIUM 2018

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