Papers by Keyword: Temkin Isotherm

Abstract: Composite scaffolds are promising regenerative medicines. Chitosan-TiO₂ nanotubes (CTNTs) scaffold as a composite scaffold is, however, associated with low biocompatibility. This research aims to increase in vitro efficacy of CTNTs scaffolds by using fibronectin (FN) and investigate the adsorption affinity of such scaffolds towards FN. CTNTs scaffolds were prepared via direct blending of TiO₂ nanotubes (TNTs) and chitosan solution. The mixture was then subjected to 24-h freezing and 24-h freeze drying. The scaffolds were further functionalized with FN solution (20, 40, 60, 80 and 100 μg/mL) via adsorption. The amount of adsorbed FN by the scaffolds was determined via colorimetric method. MG63 was used to evaluate the in vitro efficacy of CTNTs scaffolds with FN. The adsorption affinity of CTNTs scaffolds towards FN was high, as no saturation was achieved. The adsorption isotherm of FN onto CTNTs scaffolds fitted well with Temkin isotherm suggesting there was electrostatic interaction between the scaffolds and FN. Enhanced proliferation and early differentiation were observed in MG63 cultured on CTNTs scaffolds with FN. Particularly, CTNTs scaffolds functionalized with 60 μg/mL FN promoted the highest proliferation and early differentiation. CTNTs scaffolds with FN showed potential as scaffolding material for bone regeneration.

Abstract: This paper has reported a two-section model based on Temkin isotherm for interpreting the adsorption and inhibition properties of tinidazole on 45# carbon steel surface. The results show that the repulsion behavior between the adsorbed molecules turns into interattraction as the concentration of inhibitor is over 400mg/L. And additionally, the withdrawal of adsorbed molecules back into the bulk solution becomes thermodynamically favorable due to the formation of hemi-micelles.

Abstract: In this study, we modified the surface of nanoporous carbons with carboxymethylated polyethyleneimine (CM-PEI) of a high charge density in order to increase the Pt loading on the nanoporous carbons in an aqueous solution. We carried out equilibrium adsorption tests of Pt(IV) on the pure nanoporous carbon and the CM-PEI-coated carbons and evaluated the adsorption isotherm on the CM-PEI-coated carbon using various isotherm models. It was found that the adsorption of Pt(IV) onto the CM-PEI-coated carbons obeys the Langmuir isotherm model.

Abstract: We present the preparation and Cu(II) adsorption characteristics of a new and innovative composite which was composed of a carboxymethylated polyethyleneimine (CM-PEI) and an activated carbon with a nanopore less than 2 nm in diameter. In this study, we examined the adsorption phenomena of Cu(II) on the CM-PEI/F400 composite and evaluated the adsorption data using three kinds of isotherm models (Langmuir, Freundlich, and Temkin isotherms). It was found that the adsorption of Cu(II) on the CM-PEI/F400 composite obeys the Langmuir isotherm model. Furthermore, The Cu element mapping results showed that Cu was well distributed throughout all the surface of the composite particle, suggesting that the surface of the F400 particle was uniformly covered with CM-PEI.