β Scribed by Mounir A. Malati; Lina Attubato; Karen Beaney
No coin nor oath required. For personal study only.
The efficiency of the photocatalysts MoS2, ZnTe or CdSe for the reduction of aqueous carbonate or Cr(VI) is compared with that of the usual catalyst Pt/anatase P25.
The anatase pigment P25 [1], when photoplatinised [2], was found to be an efficient photocatalyst for the reduction of aqueous carbonate to methanol and carbon [3,4], whether a medium pressure mercury lamp, of mainly U.V. output, or a Xenon lamp, emitting mainly visible light, is used. A recent publication [5] contained an isolated result showing the superiority of MoS2, as a photocatalyst for reducing aqueous carbonate to methanol, under 254 nm irradiation. However, its performance was not compared to that of Pt/P25. It has been suggested that highly concentrated solar energy could be used to reduce carbon dioxide [6]. On the other hand, a solar panel containing a photocatalyst through which CO 2 circulated, was found to yield methanol and other products [7]. In the work reported here, the photocatalyzed reduction of aqueous carbonate, using a xenon lamp demonstrates the possibility of a solar-driven process which produces the useful chemical feedstock methanol as well as carbon which can be stored to mitigate the Greenhouse Effect of carbon dioxide.
We report the results of using the two semiconductors with either of the two lamps mentioned above and report on the effects of the mass of MoS 2 or the carbonate concentration on the rate of reduction to methanol and carbon. We compare these rates with the results of reduction using ZnTe. Different conditions were used when the latter catalyst was tried.
π SIMILAR VOLUMES
## Abstract BACKGROUND: This study compared the removal of aqueous Cr(VI) by multiβwalled carbon nanotubes (CNTs) modified by sulfuric acid, titanium dioxide (TiO~2~) and composite of CNTs and TiO~2~. RESULTS: More than 360 h contact time was needed to completely adsorb 3 mg L^β1^ of Cr(VI) by CNT