Browsing by Author "Manjit K. Arora"

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Active cadmium sulfide photocatalysts for hydrogen production from water
(American Chemical Society, 1998) Manjit K. Arora; A.S.K. Sinha; S.N. Upadhyay
Cadmium sulfide photocatalysts for H2 production from water using visible light were prepared by different techniques, i.e., liquid-liquid, gas-liquid, and solid-liquid reactions. The crystallite size and distribution, band gap, and stoichiometric composition of cadmium sulfide and consequently the activity were affected by the preparation technique. The activity of cadmium sulfide showed a strong correlation with its semiconducting (n- or p-type) behavior. Cadmium sulfide that was prepared by gas-solid reaction had excess interstitial cadmium ions in the lattice, which had been attributed to its n-type semiconductor behavior and superior activity. The n-type behavior of cadmium sulfide has been correlated to its stoichiometry. © 1998 American Chemical Society.
Effect of Dispersion and Distribution on Activity of Alumina-Supported Cadmium Sulfide Photocatalysts for Hydrogen Production from Water
(American Chemical Society, 1998) Manjit K. Arora; A.S.K. Sinha; S.N. Upadhyay
Activity of a cadmium sulfide photocatalyst, for hydrogen production by decomposition of water using visible light, depends on the protocol used for its preparation. In the present work, unsupported and alumina-supported CdS photocatalysts were prepared by various techniques and characterized by N2 adsorption, X-ray diffraction, electron diffraction, and X-ray photoelectron spectroscopy. The results indicate that the activity is strongly affected by the dispersion and distribution of CdS on alumina. High dispersion and preferential distribution of CdS on the surface of alumina yield superior activity. The catalyst activity has been explained with the help of its microstructure.