Loading…

Highly effective photocatalyst of TiO2 nanoparticles dispersed on carbon nanotubes for methylene blue degradation in aqueous solution

In the present study, titania nanoparticles are highly dispersed on carbon nanotubes via hydrolysis process of tetra‐isopropyl‐orthotitanate Ti[OCH(CH3)2]4 (TPOT). The obtained composite (TiO2/CNTs) is characterized by modern methods. The anatase‐TiO2 phase is realized based on X‐ray diffraction spe...

Full description

Saved in:
Bibliographic Details
Published in:Vietnam journal of chemistry 2021-04, Vol.59 (2), p.167-178
Main Authors: Quyen, Nguyen Duc Vu, Khieu, Dinh Quang, Tuyen, Tran Ngoc, Tin, Dang Xuan, Diem, Bui Thi Hoang, Dung, Ho Thi Thuy
Format: Article
Language:English
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present study, titania nanoparticles are highly dispersed on carbon nanotubes via hydrolysis process of tetra‐isopropyl‐orthotitanate Ti[OCH(CH3)2]4 (TPOT). The obtained composite (TiO2/CNTs) is characterized by modern methods. The anatase‐TiO2 phase is realized based on X‐ray diffraction spectrum at different pHs of hydrolysis solution. The band gap of TiO2/CNTs (Eg) is calculated by Tauc method using diffuse reflectance spectroscopy (DRS). The TiO2/CNTs composite plays as an active photocatalyst for methylene blue (MB) decomposition in aqueous solution. The effect of time to photocatalytic ability of TiO2/CNTs composite is described using Langmuir‐Hinshelwood kinetic model. The values of enthalpy variation (ΔH), entropy change (ΔS) and Gibbs free energy variation (ΔG) of the decomposition of MB are determined from thermodynamic study. In the range temperature from 283 K to 323 K, the positive values of ΔH and negative value of ΔG confirms endothermic and spontaneous nature of MB degradation. With the increase of temperature, the reaction occurs more easily, which is proved by more negative values of Gibbs free energy calculated from Van't Hoff equation.
ISSN:0866-7144
2572-8288
DOI:10.1002/vjch.202000091