Thermal decomposition approach for the synthesis of CdS–TiO2 nanocomposites and their catalytic activity towards degradation of rhodamine B and reduction of Cr(VI)

Investigation of metal xanthates as latent curing catalysts for epoxy resin via formation of in-situ metal sulfides

“…Since all of the metal xanthates used in this work exhibited thermal decomposition temperature and at the same time prominent curing catalytic activity only beyond 150 0 C. Its expected that the thermal decomposition of metal xanthates generating in-situ corresponding metal sulfides is responsible for induction of curing reaction of epoxy resin upon annealing. Several reports on catalytic activity of metal sulfides formed upon thermal annealing [43][44][45][46] in addition supports this probable mechanism of curing by metal xanthates.…”

Enhanced Removal of Toxic Cr(VI) in Wastewater by Synthetic TiO2/g-C3N4 Microspheres/rGO Photocatalyst under Irradiation of Visible Light

“…Semiconductor TiO 2 has been known as a promising photocatalyst due to some of its qualities: abundance, lower cost, large surface area, nontoxicity, superior photostability, and so on. , However, previous studies have shown that, due to its wide band gap (about 3.2 eV), titanium dioxide can only absorb ultraviolet light (about 4% of solar energy). , Therefore, most of the light sources used in the current research on TiO 2 photocatalytic removal of Cr­(VI) are ultraviolet or sunlight. In recent years, in order to improve the utilization of TiO 2 -based catalysts for solar energy, researchers have made considerable efforts in extending the photoresponse of TiO 2 -based catalysts to the visible region, such as nonmetal doping, metal doping, precious metal deposition, structural heterojunction, and so on. − Studies have shown that forming a heterojunction by combining TiO 2 with other semiconductors with narrow band gaps is a resultful method to increase the solar utilization of TiO 2 -based catalysts. ,, At present, graphitic carbon nitride (g-C 3 N 4 ) has been widely researched and concerned with for its low toxicity, low cost, visible-light-driven band gap, and long-term stability. − Unfortunately, the photoreaction activity of pure g-C 3 N 4 is still unsatisfactory because it is affected by the weak van der Waals force between two adjacent planes, making the transfer process of photogenerated carriers slow down, resulting in electron–hole pairs recombining at a high rate. , At present, many attempts have been made by researchers to design the required g-C 3 N 4 –TiO 2 composites, since they have a structure overlapping with a matching, which facilitates the separation and transfer of photoinduced carriers, improving the photocatalytic activity of visible light. , However, the photocatalytic reaction efficiency of the binary catalyst still needs to be enhanced for practical applications because the photogenerated electron–hole pairs are still partially recombined at the two semiconductor interfaces. , Hence, it is urgent to improve the charge transfer kinetics of the g-C 3 N 4 –TiO 2 binary reduction of the accelerated photoreaction system to increase the photoreaction efficiency.…”

“…12−16 Studies have shown that forming a heterojunction by combining TiO 2 with other semiconductors with narrow band gaps is a resultful method to increase the solar utilization of TiO 2 -based catalysts. 11,16,17 At present, graphitic carbon nitride (g-C 3 N 4 ) has been widely researched and concerned with for its low toxicity, low cost, visible-light-driven band gap, and long-term stability. 18−20 Unfortunately, the photoreaction activity of pure g-C 3 N 4 is still unsatisfactory because it is affected by the weak van der Waals force between two adjacent planes, making the transfer process of photogenerated carriers slow down, resulting in electron−hole pairs recombining at a high rate.…”

Highly Efficient Red Cabbage Anthocyanin Inserted TiO2 Aerogel Nanocomposites for Photocatalytic Reduction of Cr(VI) under Visible Light

“…Photocatalytic reduction processes is an advantageous and useful technique for removal of Cr(VI) [ 24 ]. A number of photocatalysts such as Ag/TiO 2 , [ 25 ] Cu/TiO 2 , [ 26 ] CdS-TiO 2 [ 27 ], Rhodamine B-sensitized TiO 2 [ 26 ], and AgBr/B-doped reduced graphene oxide (RGO) aerogels [ 28 ] have been developed for photocatalytic reduction of Cr(VI). Moreover, Wang et al [ 29 ] reported that low molecular weight carboxylic acids can enhance the photoreduction of Cr(VI) with neat anatase TiO 2 .…”