Fabrication of Ag‐photodeposited TiO₂/cordierite honeycomb monolith photoreactors for 2‐naphthol degradation

Abstract

BACKGROUND Polycyclic aromatic hydrocarbons and their derivatives have harmful effects on organisms and the environment. As a typical polycyclic aromatic hydrocarbon, 2‐naphthol is a persistent, highly toxic organic pollutant that biodegrades very slowly and thus its elimination is of high priority. RESULTS Ag‐deposited TiO2/cordierite honeycomb monoliths (CHMs) have been successfully applied to the photocatalytic degradation of 2‐naphthol. The physical properties of the catalyst were characterized using various techniques. Deposition of metallic silver on a thin layer of TiO2 adhering to the inner walls of the CHM reduces the bandgap energy and lowers the recombination rate of photogenerated electrons and holes. The optimal photocatalyst (0.4Ag‐deposited S700‐ST) exhibits a first‐order degradation rate of k = 0.048 min−1 with 91.0% decomposition of 2‐naphthol after 240 min of irradiation with 12 W, 395 nm LED light. The 0.4Ag‐deposited S700‐ST material is stable throughout four photocatalytic reaction cycles. CONCLUSIONS The work presented describes the development of a robust, stable TiO2‐coated CHM that overcomes the recovery drawbacks of nano‐TiO2‐based slurries in photocatalytic wastewater treatment. © 2020 Society of Chemical Industry

Ilmenite-Grafted Graphene Oxide as an Antimicrobial Coating for Fruit Peels

“…The [ F ( R ) h ν 2 plot for direct transition was obtained according to the Kubelka–Munk function, F ( R ), which is equivalent to the absorbance of the material in the UV–vis spectrum; h ν = (1239/ƛ) eV, where ƛ is the wavelength in nm. The value of h ν is extrapolated to F ( R ) h ν = 0, which gives the absorption energy corresponding to the band gap E v . The band gap energy values obtained for natural ilmenite, cal-Ilm, and the cal-Ilm/GO nanohybrid were 3.37, 2.90, and 2.63 eV, respectively.…”

Manipulating the Structure and Characterization of Sr1−xLaxTiO3 Nanocubes toward the Photodegradation of 2-Naphthol under Artificial Solar Light

“…Although the conditions for conducting the experiments are different, it is worth comparing the recent studies on the photodegradation of 2-naphthol in terms of degradation efficiency. Table 5 shows several achievements of the photodegradation of 2-naphthol in the literature [31,[87][88][89][90][91][92]. As we can see in the table, photocatalysis could effectively remove 2-naphthol with attractive performance.…”

“…Photocatalytic processes could completely degrade organic compounds into the final products of CO 2 and H 2 O or less harmful secondary chemicals under mild reaction conditions . Several studies have attempted to degrade 2-naphthol using TiO 2 [31], SrTiO 3 [32], and ZnO [33] as photocatalytic catalysts due to their suitable band structures, which able to act as photocatalysts [32]. Titanium dioxide (TiO 2 ) is the most broadly utilized to address many serious environmental problems and challenges from pollution due to its abundance, nontoxicity, low cost, and corrosion stability [34].…”

Innovative TiO2‐based photocatalysis: recent advances and emerging applications

“…It notes the photocatalytic efficiency over TiO 2 is limited by the inactive under visible light irradiation and the quick recombination of the photogenerated electron–hole pairs. Hence, several efforts have made substantial contributions to the promoting of TiO 2 ‐based photocatalysis, including the incorporation of co‐catalysts, 3‐6 metal/nonmetal elements doping, 7‐11 fabricating composite systems 12‐15 . In particular, Ani et al .…”

“…Interestingly, Vo et al . used Ag‐deposited TiO 2 for coating the cordierite honeycomb monoliths (CHMs) 4 . The fabricated CHMs offered many advantages in photodegradation of pollutants, including reusability with convenience, simple regeneration and high photoactivity.…”