TiO2 supported over SBA-15: An efficient photocatalyst for the pesticide degradation using solar light

CeO2 for Water Remediation: Comparison of Various Advanced Oxidation Processes

“…Furthermore, in accordance with our preceding work [7], and the literature data [54,55], as confirmed for all the AOPs investigated, the IMI degradation is characterized by the formation of various by-products as amine and chloro-pyridine species. The reaction mechanism involves the breaking of C-N and the N-N bonds followed by the formation of small molecules, such as chlorine dioxide, nitrogen oxides species, water and carbon dioxide [7,54,55]. The reported degradation percentage of IMI (i.e., the variation of the IMI concentration respect to the initial IMI concentration) was low even through photocatalysis [54][55][56], solar photo-Fenton [57], or UV-A photolysis [28].…”

“…As a result, even utilizing TiO 2 (the most investigated photocatalyst), the degradation efficiency is not so high [7,53]. Furthermore, in accordance with our preceding work [7], and the literature data [54,55], as confirmed for all the AOPs investigated, the IMI degradation is characterized by the formation of various by-products as amine and chloro-pyridine species. The reaction mechanism involves the breaking of C-N and the N-N bonds followed by the formation of small molecules, such as chlorine dioxide, nitrogen oxides species, water and carbon dioxide [7,54,55].…”

“…The reaction mechanism involves the breaking of C-N and the N-N bonds followed by the formation of small molecules, such as chlorine dioxide, nitrogen oxides species, water and carbon dioxide [7,54,55]. The reported degradation percentage of IMI (i.e., the variation of the IMI concentration respect to the initial IMI concentration) was low even through photocatalysis [54][55][56], solar photo-Fenton [57], or UV-A photolysis [28]. In particular, with UV irradiation it is possible to obtain a complete photolysis of IMI after a long time of irradiation (about 10 h) [28], whereas in our precedent work [7] with molecularly imprinted TiO 2 samples, it was possible to selectively photodegrade IMI even in a pesticide mixture, although the degradation efficiency did not exceed 40% with a partial mineralization of~35% (evaluated by the Total Organic Carbon, TOC, analysis) after 3 h of UV irradiation.…”

“…Kitsiou et al [57] found that the reaction efficiency can be improved utilizing a combination of photo-Fenton under UV-A irradiation and TiO 2 , due to the synergism between the homogenous iron catalyst and the heterogeneous TiO 2 photocatalyst (~80% of degradation after 2 h of UV-A irradiation and~60% of TOC mineralization), whereas only the solar homogenous photo-Fenton with iron reached~50% for both degradation and removal of organic carbon after 3 h of UV-A irradiation. The most promising result was obtained by Sharma et al [54] with a particular TiO 2 supported on mesoporous silica SBA-15, that allowed to achieve~90% IMI degradation after 3 h of solar irradiation. In this contest, the obtained (photo)catalytic performances of CeO 2 for the degradation of IMI described in this work are in line with the results obtained with the TiO 2 -based materials.…”

The Application of Nano-TiO2 Photo Semiconductors in Agriculture

“…However, the main problem, which has limited the practical application of nano-TiO 2 photocatalysis for water purification, is either a relatively low process rate or a limited efficiency for the use of irradiated energy [1, 54, 55]. A possible approach to solve this problem is the exploitation of low-cost radiation such as solar energy [56, 57].…”