Abstract: A process of removing selenocyanate from an aqueous medium contaminated with at least selenocyanate. In the presence of UV light and TiO2 as a photocatalyst, selenocyanate is initially photolyzed to release Se(0). Se(0) is then oxidized to Se(IV) and finally Se(VI) by free radicals generated by the photocatalyst. After the oxidation is complete, a hole scavenger is added and mixed with the aqueous medium to trigger the reduction of Se(VI) to Se(0).

Abstract: A method for removing sulfur-based gases from a gas stream comprises contacting a sulfur containing gas stream under dynamic flow conditions with granular activated carbon (GAC) to adsorb substantially all sulfur-containing gas from the gas stream. The granular activated carbon (GAC) can be derived from date palm pits.

Abstract: A method of dye removal from wastewater includes producing activated carbon from heavy oil fly ash and using the activated carbon to adsorb dye in the wastewater. The heavy oil fly ash based activated carbon is produced using phosphoric acid based chemical activation. The dye can be removed from wastewater by contacting the wastewater with the activated carbon. The activated carbon can then be separated from the wastewater to remove the dye, and thereby, purify the wastewater.

Abstract: A method of dye removal from wastewater includes producing activated carbon from heavy oil fly ash and using the activated carbon to adsorb dye in the wastewater. The heavy oil fly ash based activated carbon is produced using phosphoric acid based chemical activation. The dye can be removed from wastewater by contacting the wastewater with the activated carbon. The activated carbon can then be separated from the wastewater to remove the dye, and thereby, purify the wastewater.

Abstract: A process of removing selenocyanate from an aqueous medium contaminated with at least selenocyanate. In the presence of UV light and TiO2 as a photocatalyst, selenocyanate is initially photolysed to release Se(0). Se(0) is then oxidized to Se(IV) and finally Se(VI) by free radicals generated by the photocatalyst. After the oxidation is complete, a hole scavenger is added and mixed with the aqueous medium to trigger the reduction of Se(VI) to Se(0).

Abstract: A method for removing sulfur-based gases from a gas stream comprises contacting a sulfur containing gas stream under dynamic flow conditions with granular activated carbon (GAC) to adsorb substantially all sulfur-containing gas from the gas stream. The granular activated carbon (GAC) can be derived from date palm pits.

Abstract: A method for the removal of aqueous phase selenite and selenate species using TiO2 assisted photocatalysis employing the use of artificial light, or solar radiation, in conjunction with EDTA as a hole scavenger. Among the two processes, UV-lamp assisted photocatalysis has the highest efficiency comparatively followed by solar light assisted photocatalysis. TiO2 mediated photocatalysis in conjunction with EDTA as an h+ scavenging agent is an efficient technique for selenium ion removal.

Abstract: A method for the removal of aqueous phase selenite and selenate species using TiO2 assisted photocatalysis employing the use of artificial light, or solar radiation, in conjunction with EDTA as a hole scavenger. Among the two processes, UV-lamp assisted photocatalysis has the highest efficiency comparatively followed by solar light assisted photocatalysis. TiO2 mediated photocatalysis in conjunction with EDTA as an h+ scavenging agent is an efficient technique for selenium ion removal.

Abstract: A method for removing one or more volatile organic compounds (VOCs) from a gas stream, in which the method includes adsorbing one or more of the gaseous volatile organic compounds (VOCs) on a granular activated carbon (GAC) obtained from date palm pits. The granular activated carbon is obtained by a process of: cutting the date palm pits into particles; mixing the particles with an acid solution to form soaked date palm pits; transferring the soaked date palm pit particles to stainless steel tubes; heating the tubes inside a muffle furnace; transferring the tubes to a desiccator and cooling; washing the granular activated carbon samples with water and drying; and sieving the samples. The obtained GAC is successfully tested under dynamic continuous gas flow conditions for gas phase benzene removal under a varying set of conditions including different gas phase benzene concentrations.

Abstract: A photocatalyst, which has an opposite electric charge to a substances to be treated, in which the opposite electric charge is given by carrying an inorganic substance on a surface of the photocatalyst. A method for producing the photocatalyst.

Abstract: An apparatus, method and medium for implementing fault-tolerant three-phase flushing for database transaction commits in a cluster including multiple nodes of shared-memory processors. The apparatus, method and medium include executing the primary of a commit coordinator process pair on a first of the nodes and executing its backup on a second node, executing the primary of a resource manager process pair on a third node and executing its backup on a fourth, and executing the primary of a Log process pair on a fifth node and executing its backup on a sixth. The first and second nodes as distinct from each other, as are the third and fourth nodes, as are the fifth and sixth nodes.