Carbon nitride shows great potential in photocatalysis, to some extent, due to its insolubility and high thermal, chemical and optical stability. However, it always brings great difficulties for its surface modification and hinders the photocatalysis development. Traditional salt without melting condition is hard for the direct modification of carbon nitride. Herein, pristine carbon nitride (CN) was further modified through the synergetic modification of halide salts (NaCl and KCl) and water vapor. For the obtained product (Na-K-4h), it was carefully studied from three points: the appearance and morphology, the change of chemical structure and composition, and the chemical analysis of its by-products. These researches reveal that H 2 O could be divided into H and OH. H helps the halide away from halide salt, while the left OH replaces NH groups and help K and Na chelate with CN. This method could also be applied to other salt mixture system (such as NaCl/KI, NaCl/KBr). In this work, Na-K-4h was further applied in photocatalystic H 2 evolution (PHE). Based on this synergistic effect, Na-K-4h show about 27-fold PHE activity higher than CN.
An ionic compound, bis[1-methyl-3-(3′-sulfopropyl)imidazolium] hexafluorotitanate ( 1 ), was proved to be the efficient and recyclable catalyst for the oxidative halogenations of arenes in water using H 2 O 2 as the oxidant and halide salts as the halogenation sources. The mono-halogenated products were obtained selectively by this method. The synergetic catalytic effect coming from the two incorporated functionalities of SO 3 H and [TiF 6 ] 2− was manifested in 1 . The halogenation rate catalyzed by 1 was in the ranking of NaBr ≫ NaCl > KI. The UV–vis and FT-IR analyses indicated that the successful formation and regeneration of the active peroxo-Ti species ( 1A ) with the aid of proton acid guaranteed the recycling uses of 1 .
It was recently found that halogen salts can facilitate hydrate formation at low concentrations, and this finding provides new ideas on hydrate-based adsorption-hydration natural gas (AHNG) technology by using diluted seawater so as to save fresh water. However, complicated hydrate formation kinetics was commonly anticipated due to ion specific effect, while porous surface further enhances the effect. To improve the understanding of the synergy of ion specific effect and porous surface on hydrate formation kinetics, hydrate formation loaded by activated carbon (AC) in the presence of 4 halogen salts was carried out. It was found that both of promotion and antagonism effect appears in the ion-porous surface system, KI performs the best on promoting hydrate nucleation, and hydrate induction period even disappears when 0.05 wt% KI was applied. In contrast, 0.1 wt% NaCl enhances methane storage capacity and performs excellent at high water contents, and an average increase of 9.6 V/V in methane storage capacity was obtained for different water contents. The promotion mechanisms of specific ions on hydrate formation were speculated, and I − and Na + were found to perform better on enhancing hydrate nucleation and conversion, respectively. I − can induce interfacial hydration shells to promote hydrate nucleation, while the porous surface significantly increases gas–liquid contact area and enhance the promotion, and Na + improves water-to-hydrate conversion in confined porespace due to ion selection induced by confinement.
危险品化学品经营许可证（带存储）