Topic
Activated alumina
About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.
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TL;DR: In this paper, the efficiency of the sonochemical coating process was determined by UV photodecolourisation of the aqueous methyl orange solution, and the results indicated that the direct immersion horn results in uniform, as well as a maximum number of TiO2 particles to be adsorbed on an activated alumina surface.
Abstract: Nanosized TiO2 supported on activated alumina was prepared using a sonochemical method. To prepare this supported material, direct immersion horn and cup horn ultrasonic systems were used. The efficiency of the sonochemical coating process was determined by UV photodecolourisation of the aqueous methyl orange solution. It was found that TiO2 supported on activated alumina prepared by the sonochemical method gave the maximum decolourisation efficiency. In that method itself, direct immersion horn gave a higher photodecolourisation activity as compared to the cup horn. The obtained results suggest that the direct immersion horn results in uniform, as well as a maximum number of TiO2 particles to be adsorbed on an activated alumina surface.
22 citations
TL;DR: A 2-year three-phase study into methods for treatment of mixed inorganic and organic arsenic species to drinking water levels was conducted at a former pesticide facility in Houston, Tex. as discussed by the authors.
Abstract: A 2-year three-phase study into methods for treatment of mixed inorganic and organic arsenic species to drinking water levels was conducted at a former pesticide facility in Houston, Tex. The species present include monomethylarsinic acid, dimethylarsinic acid, arsenate, and arsenite. Phase One studies reported here included the evaluation of four adsorbents using bottle roll and column flow through techniques, oxidation through the application of Fenton's reagent followed by coprecipitation, coprecipitation without oxidation, and ultraviolet (UV)/ ozone tests. The four adsorbents tested were activated carbon, activated alumina, ferrous sulfide, and a strongly basic ion exchange resin. All adsorbents removed some arsenic, but none except ferrous sulfide was sufficiently effective to warrant follow-up studies. Two small ferrous sulfide column tests, run under different conditions, removed arsenic but not to the levels and loading capacities needed to make this method practical. Organic compound destruction was tested using Fenton's reagent (a mixture of hydrogen peroxide and ferrous iron) before coprecipitation. Arsenic was reduced to 170 ppb in the treated liquor. Coprecipitation without oxidative pretreatment produced a liquor containing 260 ppb arsenic. A two-stage Fenton-type coprecipitation procedure produced a supematant containing 110 ppb total arsenic. Preliminary tests with a second-stage oxidative process, using ozone and UV radiation, showed approximately 80% destruction of an organic-arsenic surrogate (cacodylic acid) in I hour. Water Environ. Res., 68, 946 (1996).
22 citations
TL;DR: In this paper, the effect of preozonation on the organics adsorption efficiencies of activated carbon, activated alumina, activated bauxite and bone char adsorbents was investigated.
22 citations
Patent•
01 Apr 1987
TL;DR: In this paper, a reactive coating including a layer of activated alumina particles coated with p-nitrobenzyl pyridine and ammonium chloride is adapted to instantly produce a color intensity change directly related to the dosage of the reactive coating to ethylene oxide upon the addition of a developer.
Abstract: Monitoring exposure to ethylene oxide using a dosimeter or monitoring device avoids using devices that collect a sample for future testing or devices that must be sent away for lab analysis. The device comprises a reactive coating including a layer of activated alumina particles coated with p-nitrobenzyl pyridine and ammonium chloride, and is adapted to instantly produce a color intensity change directly related to the dosage of the reactive coating to ethylene oxide upon the addition of a developer.
22 citations
TL;DR: In this article, the regeneration performance of different desiccants such as silica gel, activated alumina, and activated charcoal by using parabolic dish collector has been proposed, which is greatly affected by the solar radiation, surface temperature of desiccant, but also depends on the initial moisture content in the descant.
Abstract: In this article, the regeneration of different desiccants such as silica gel, activated alumina, and activated charcoal by using parabolic dish collector has been proposed. The regeneration performance is greatly affected by the solar radiation, surface temperature of desiccant, but also depends on the initial moisture content in the desiccant. The adsorption performance depends upon humidity ratio of air and ambient temperature. The results showed that the regeneration rate and the adsorption rate for silica gel were high as compared to activated alumina and activated charcoal. One kilogram of silica gel on dry basis took 120 minutes, 110 minutes for complete regeneration in forenoon and afternoon period, respectively. In the case of adsorption, silica gel took 560 minutes.
22 citations