Investigation of Ce-TiO 2 photocatalyst and its application in asphalt- based specimens for NO degradation

A Brief Overview of TiO2 Photocatalyst for Organic Dye Remediation: Case Study of Reaction Mechanisms Involved in Ce-TiO2 Photocatalysts System

“…Cao et al [51] synthesized 0.2% Ce-TiO 2 by the sol-gel method. The photodegradation test of methylene blue (MB) was carried out to assess the photocatalytic activity of Ce-TiO 2 .…”

Photocatalytic and smart asphalt mixtures: a brief overview

“…In order to obtain photocatalytic asphalt mixtures, it is possible to highlight four main techniques that can be utilized to apply the semiconductor materials in the asphalt mixtures: i) spraying coating 3,6,19,[25][26][27] , ii) volume incorporation 3,27 , iii) bitumen modification 19 , and iv) spreading 27,28 . Bitumen modification is developed before the fabrication of the asphalt mixture.…”

“…An important concern that should be taken into account when it is desired to obtain photocatalytic aqueous solutions is the dispersion of the TiO2 nanoparticles; otherwise they may agglomerate and, consequently, decrease the photocatalytic efficiency. Some authors submitted TiO2 solutions to ultrasonic treatment 26,27 or prepared aqueous solutions with a value of zeta potential different from the isoelectric point 3 . The previews preparation reduces the agglomeration of particles because of the van der Waals attraction forces that should be competing with the repulsive electrostatic forces 3 .…”

“…In this sense, one of the most important concerns reported in literature review to obtain improved photocatalytic materials is the doping of TiO2 particles with different materials in order to decrease its band gap to the wavelength range of visible light, thus promoting the degradation of pollutants when subjected to the incidence of photons in the visible range 26,35 . So, in asphalt mixtures, the functionalization by La-doped 26 , Ce-doped TiO2 27 , both by ultrasonic assisted sol-gel and by N-doped 36 TiO2 by a simple mixing have been studied by several authors. The authors concluded that TiO2 doped with 0.5% of La 26 and 0.2% of Ce 27 presented the optimal photocatalytic efficiency.…”

“…In order to measure this capability, the literature presents tests of NOx degradation efficiency according to the standards ISO 22197-1 and JIS TR Z 0018 19,27,37 , and tests of photocatalytic efficiency by degradation of different organic dyes, such as methylene blue (MB) and Rhodamine B (RhB), using spectrophotometry 3,4,27 (Fig. 2).…”