Methylene Blue Removal Using Surface-Modified TiO2 Nanoparticles: A Comparative Study on Adsorption and Photocatalytic Degradation

Journal of Water and Environmental Nanotechnology

ARTICLE

Mohammadi, Asadollah¹  Aliakbarzadeh Karimi, Ali¹ 

[1] Department of Chemistry, Faculty of Sciences, University of Guilan

关键词: Adsorption;    Photocatalytic Degradation;    Surface Modification;    TiO2 Nanoparticles;   

DOI  :  10.22090/jwent.2017.02.007

学科分类：数学（综合）

来源: Iranian Environmental Mutagen Society

【 摘 要 】

This study describes the adsorption and photocatalytic removal of methylene blue (MB) from aqueous solution by surface-modified TiO2 nanoparticles under ultraviolet irradiation in a batch system. The 5-sulfosalicylic acid grafted TiO2 (5-SA-TiO2 ) as a photocatalyst was characterized by means of XRD, FTIR and SEM techniques. The surface of TiO2 nanoparticles was modified by 5-sulfosalicylic acid (5-SA) to increase performance by altering surface properties. Notably, in contrast with the adsorption process, the remarkable removal enhancement of MB dye was observed by photocatalytic degradation process from aqueous solution. The adsorption and photocatalytic degradation kinetics of MB using 5-SA-TiO2 nanoparticles have also been investigated. The results show that the photocatalytic degradation was good fit with the pseudo-first-order kinetic model (R2 > 0.99). The adsorption isotherm of MB onto modified TiO2 nanoparticles fitted into the Temkin equation. In addition, thermodynamic studies indicate the spontaneous behavior of adsorption and photocatalytic degradation processes.

【 授权许可】

CC BY