Solid-Phase Photocatalytic Degradation of Polyvinyl Borate

Abstract

In this study, polymer composites based on polyvinyl borate (PVB) with titanium dioxide (TiO2) nanoparticles were prepared through the condensation reaction of polyvinyl alcohol and boric acid in the presence of TiO2 nanoparticles. The solid-phase photocatalytic degradation of the polymer composites under UV light irradiation was investigated and compared with that of the pure PVB with the aid of weight loss measurements. The introduction of the photocatalyst nanoparticles in PVB enhanced the solid-phase photocatalytic degradation of the polymer matrix under UV light irradiation. The structural and morphological properties of PVB/TiO2 composites were analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and UV-Vis spectroscopy, respectively. FTIR analysis revealed that PVB synthesis was successfully carried out in the presence of the photocatalyst nanoparticles. According to the morphological analyses, TiO2 nanoparticles were well dispersed in the PVB matrix.

Theoretical study of catalytic activity modifications in CO2 methanation induced by an electric field in solid-oxide cells

“…Note that this model assumes that the gas composition is mixed perfectly in the reactor and ignores surface diffusion. 71,73–77…”

“…ODE15s is a variable-order solver based on numerical differentiation formulas for solving differential algebraic problems. 78,79 The equation of mass conversion that can be solved for the time-derivative molar number of the i th species n i is as follows: 71,73–77 where A s is the catalyst surface area; N rxn is the reaction number; v j , i is the stoichiometric ratio of the i th species in the j th reaction; k j and k − j are the forward and reverse rate constants in the j th reaction, respectively; S R and S P are the numbers of reactants and products in each reaction, respectively; C i is the i th species concentration; F i ,in is the inlet flow amount of the i th species; V is the reactor volume; and t res is the residence time. Note that if the gas and surface species are considered, the switching parameter γ i ,in is 1 and 0, respectively.…”

Polietilen glikol ve Alginat katkıları ile üretilen nano Titanyum dioksitin nanoakışkan olarak kullanımının incelenmesi

“…Karbon nanotüpler ve oksit partiküller içeren nanoakışkanlar genellikle iki adım yöntemiyle üretilir. [1,13]. Nanoakışkanların stabilizasyonu, çalışmalarda önemli bir parametredir.…”