Thermodynamic Studies on the Adsorption Processes of Rhodamine B on Bismuth Tungstate Photocatalyst of Different Morphologies
ZHANG Yongfang
CHEN Aiju
MI Yuwei
LIU Min
ZENG Suyuan
Abstract：The catalytic of semiconductor photocatalyst is closely related to its surface adsorption,so the thermodynamic behavior of adsorption process needs to be studied.In this study,nano-watt-scale isother-mal titration calorimetry(ITC)was conducted to explore the adsorption process of Rhodamine B(RhB),a representative water pollutant,onto Bismuth Tungstate(Bi2WO6)nanostructures of three different mor-phologies,namely flower-like,pancake-like and sheet-like.Important thermodynamic parameters,such as molar adsorption enthalpies,equilibrium constants of adsorption,and the saturation of monolayer adsorp-tion for the adsorption process of RhB on Bi2WO6 nanoparticles have been calculated from the calorimetric data.The results have demonstrated significant differences in the adsorption processes between the sur-faces of nanoparticles with different morphologies.The thermodynamic behaviors of the liquid-solid ad-sorption systems have been discussed in light of several important weak interactions,including electrostat-ic force,orientation force,hydration,and dehydration of the adsorption sites and the adsorbed molecules(or ions).
Keywords：Bismuth tungstateRhodamine Bthermodynamic parametersadsorption processesweak interactions
Publication Date：2024-12-28
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：9( 87-95 )