TiO2, SnO2 and ZnO catalysts supported on mesoporous SBA-15 versus unsupported nanopowders in photocatalytic degradation of methylene blue

Bimetallic Metal‐Organic Framework Derived ZnO/Ni0.9Zn0.1O Nanocomposites for Improved Photocatalytic Degradation of Organic Dyes

“…This indicates that the demethylation process firstly takes place on the auxochrome groups of MB molecular, which then induces the electrons on the benzene ring pulled up to the branched chain, thus leading to the blue shift. This phenomenon can also be seen in NiO‐based and other materials . In addition, the degradation efficiency of the as‐formed ZnO/Ni 0.9 Zn 0.1 O‐82 catalyst is superior to those NiO and NiO‐based catalysts modified by other components under the same UV‐light source (Figure d) …”

“…This phenomenon can also be seen in NiO-based and other materials. [9,37,38] In addition, the degradation efficiency of the asformed ZnO/Ni 0.9 Zn 0.1 O-82 catalyst is superior to those NiO and NiO-based catalysts modified by other components under the same UV-light source (Figure 4d). [22,23,[38][39][40][41][42] In order to identify the dominated active species involved in the photocatalytic process of ZnO/Ni 0.9 Zn 0.1 O nanocomposites under UV-light, the radicals trapping experiments were carried out by choosing benzoquinone (BQ), potassium persulfate (K 2 S 2 O 8 ), oxalic acid (OA), and ethanol as the scavengers of superoxide radical ( * O 2 À ), electron (e À ), hole (h + ), and hydroxyl radical ( * OH), respectively.…”

“…Until now, there are many ways proposed to remove or degrade the organic pollutants, such as adsorption, biodegradation, photocatalytic degradation, ozonation, advanced oxidation, Fenton degradation, etc . Particularly, photocatalytic degradation method receives wide attention due to the superiorities of low temperature, complete mineralization, and utilizing oxygen as oxidant . Generally, there are mainly three kinds of photocatalysts used for the degradation of organic dyes, including constructing carbon‐based or porous materials (e. g. graphene, porous carbon, metal‐organic framework) to improve the synergistic effect, enhance light absorption, and suppress recombination of photogenerated charges, preparing metal oxides to dominate electron‐hole pairs and facilitate the generation of charge carriers, and doping metal oxides or integrating other materials to adjust the band gap .…”

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhance the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

“… 6 However, the obvious drawbacks of these methods, such as low efficiency, high cost, and/or short service life, continuously drive the exploration of advanced materials for the degradation of synthetic dyes in polluted water. 7 Various catalytic systems such as amorphous alloys, 8 semiconductor metal heterostructures, 9 polymer-based nanocomposites, 10 graphene oxide (GO), 11 carbon quantum dots, 12 amorphous thin ribbons, 13 nanopowders, and nonporous structures 14 have been shown to exhibit relatively satisfactory performance in wastewater remediation for removing synthetic dyes and other organic pollutants.…”

Photocatalytic degradation of trace CHCl3 in drinking water by nano TiO2

“…of tetraethylorthosilicate (C8H20OSi, TEOS) (MERCK) were well mixed (at the pH value of 7.0) in the ethanol and distilled water (1:2) solution (45 mL). The TiO2-SiO2 solution was heated slowly until the sol-gel became xerogel, and then separated and calcined at K for 1 h. The nano TiO2 photocatalysts was synthesized in a similar procedure.The TiO2 supported on SBA-15 that has a 2-D hexagonal mesoporous structure with long and straight channels parallel to the silica skeletons photocatalyst were prepared by co-condensation of silica, titanium oxide and neutral charge poly(ethylene oxide)poly(propylene oxide)-poly(ethylene oxide) (EO20PO70EO20 (P123)) (Aldrich, 99%) nonionic surfactant[27]. Briefly, 0.21 g of titanium n-butoxide (Ti(OBu)4, Aldrich, 97%) and 15 g of sulfuric acid (1.2 M, MERCK) were well mixed until the solution became clear, a solution containing 2.75 g of sodium silica (14% NaOH and 27% SiO2) (Aldrich), 1.25 g of P123 and 200 g of distilled water was added.…”