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Issue 47, 2018
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Shape dependence of thermodynamics of adsorption on nanoparticles: a theoretical and experimental study

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Abstract

Nanomaterials have excellent adsorption performance, which mainly depends on the adsorption thermodynamics that is related to the shape of the nanoparticles that make up the nanomaterial, but the effects of shape on the thermodynamics of adsorption are not fully clear. In this paper, theoretically, the general formulae of adsorption thermodynamic properties for nanoparticles with different shapes and different sizes were derived, and the influencing regularities and mechanisms on adsorption thermodynamic properties were discussed. Experimentally, the influences of the shape and size of nano-CeO2 on the thermodynamics of adsorption were studied in aqueous solution. The experiment results showed that the shape has significant influences on the thermodynamics of adsorption, and the smaller the particle size, the more significant the effects of shape on the thermodynamics. For the adsorption of nano-CeO2 with different shapes and the same equivalent particle size, compared with the sphere, the equilibrium constant of adsorption Image ID:c8cp04895a-t1.gif for the octahedron is larger, while the molar Gibbs free energy of adsorption Image ID:c8cp04895a-t2.gif, the molar adsorption enthalpy of adsorption Image ID:c8cp04895a-t3.gif and the molar adsorption entropy of adsorption Image ID:c8cp04895a-t4.gif are smaller. For the adsorption of nano-CeO2 with the same shape, with the decreasing particle size, Image ID:c8cp04895a-t5.gif increases, while Image ID:c8cp04895a-t6.gif, Image ID:c8cp04895a-t7.gif and Image ID:c8cp04895a-t8.gif decrease; and Image ID:c8cp04895a-t9.gif, Image ID:c8cp04895a-t10.gif, Image ID:c8cp04895a-t11.gif and Image ID:c8cp04895a-t12.gif are each linearly related to the reciprocal of particle size. The experimental results are consistent with the theoretical relations. The theories can quantitatively describe the adsorption behavior on nanoparticles, explain the regularities and mechanisms of influence of shape, and provide guidance for the research and application of nanoadsorption.

Graphical abstract: Shape dependence of thermodynamics of adsorption on nanoparticles: a theoretical and experimental study

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Publication details

The article was received on 01 Aug 2018, accepted on 12 Nov 2018 and first published on 27 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP04895A
Citation: Phys. Chem. Chem. Phys., 2018,20, 29959-29968
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    Shape dependence of thermodynamics of adsorption on nanoparticles: a theoretical and experimental study

    Z. Cui, Y. Feng, Y. Xue, J. Zhang, R. Zhang, J. Hao and J. Liu, Phys. Chem. Chem. Phys., 2018, 20, 29959
    DOI: 10.1039/C8CP04895A

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