Early stages of ZnS growth studied by stopped-flow UV absorption spectroscopy: Effects of educt concentrations on the nanoparticle formation

Article Abstract:

An experiment to determine the growth of ZnS nanoparticles by precipitation from supersaturated aqueous solution by stopped-flow UV absorption spectroscopy is conducted. The observations of the average size, size distribution and concentration of the particles within the sub-second time regime with a resolution of 1.28ms shows that the early stages of ZnS nanoparticle growth is regulated by ripening processes both for stoichiometric and nonstoichiometric educt concentrations and the initial sulfide concentration strongly influences the growth kinetics than the initial zinc concentration.

Zinc Sulfate, Aqueous solution reactions

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Adsorption of HCl on the water ice surface studied by X-ray absorption spectroscopy

Article Abstract:

The adsorption state of HCl at 20 and 90 K on crystalline water ice films deposited under ultrahigh vacuum at 150 K is investigated in a study using X-ray absorption spectroscopy at the O1s K-edge and Cl2p L-edge. It is seen that HCl dissociates at temperatures as low as 20 K, in agreement with the prediction of a spontaneous ionization of HCl on ice.

Hydrochloric Acid

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Characterization of intercalated iron(III) nanoparticles and oxidative adsorption arsenite on them monitored by X-ray absorption fine structure combined with fluorescence spectrometry

Article Abstract:

The screening and optimization of Fe(super III) - based adsorbents are done for arsenic adsorption from 0.2 to 16 ppm test solutions of arsenite/arsentic. The speciation of As adsorbed was performed by As K-edge X-ray absorption fine structure (XAFS) combined with high-energy resolution fluorescence spectrometry.

Arsenic & Compounds, Arsenic compounds, Iron compounds, Chemical properties

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