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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01 Sep 2003
TL;DR: Aiming at the development of novel efficient absorbents for phosphorus removal from wastewater, metal hydrates (MeH) were selected as adsorbent material and lanthanum hydrate (LaH) was found to possess a high adsorption capacity.
Abstract: Aiming at the development of novel efficient absorbents for phosphorus removal from wastewater, metal hydrates (MeH) were selected as adsorbent material. Several kinds of MeH were tested for phosphorus adsorption, and lanthanum hydrate (LaH) was found to possess a high adsorption capacity. Corresponding to solution pH change, LaH' s adsorption capacity changed largely, and at about pH = 3 reached the peak. Its adsorption isotherm accorded prefer Langmuir's to Fruendrich's equations. Influences of different anions on its adsorption capacity were tested. This adsorbent was effective to adsorb orthophosphate but limited to remove polyphosphoric anion. The experimental results demonstrated that the LaH adsorbent was superior to traditional activated alumina adsorbent in adsorption performance.
11 citations
TL;DR: The interference of coexisting ions and their effect on fluoride removal capacity were evaluated, showing a severe impact of the presence of phosphate on the removal capacity unlike nitrates and sulfates, which slightly improved the fluoride sorption.
Abstract: Natural organic matter (NOM) is a major water constituent that affects the performance of water treatment processes. Several studies have shown that NOM can be adsorbed on the surface of oxides and may compete with other ions. The overall goal of this study was essentially to investigate the competitive adsorption between fluoride and NOM on activated alumina (AA). For this purpose, a humic acid (HA) was used as a model compound for NOM. The interaction of NOM with fluoride, the simultaneous competitive adsorption, and the effect of preloading AA with NOM were investigated. The specific absorbance of HA was determined at 254 nm. Size-exclusion chromatography measurements confirmed the adsorption of aromatic fractions of NOM onto AA. The presence of HA in the system inhibited fluoride sorption onto AA and the removal yield using fresh AA decreased from 70.4 % to 51.0 % in the presence of HA. The decrease was more pronounced using AA preloaded with HA, reaching 37.7 %. The interference of coexisting ions and their effect on fluoride removal capacity were evaluated, showing a severe impact of the presence of phosphate on the removal capacity unlike nitrates and sulfates, which slightly improved the fluoride sorption.
11 citations
Patent•
08 Dec 1987
TL;DR: In this article, a slurry of zirconium oxide and activated alumina sol sol was used to obtain the title catalyst for removing carbon monoxide, hydrocarbons, and nitrogen oxides in the exhaust gas from an automobile.
Abstract: PURPOSE:To obtain the title catalyst having excellent purification performance, durability, etc, by depositing a slurry contg zirconium oxide contg rhodium, activated alumina contg cerium, cerium oxide, and an alumina sol on a carrier, drying and baking the obtained material, and then depositing platinum on the material CONSTITUTION:About 015-7wt% rhodium is incorporated into zirconium oxide by impregnation, etc, and about 1-5wt% cerium is incorporated into activated alumina The zirconium oxide and the activated alumina are crushed and mixed in an alumina sol to obtain a slurry, and a carrier is impregnated with the slurry, dried, and baked to form composite oxide coated film contg rhodium on the carrier Pt is then deposited on the coated film to obtain the catalyst The catalyst has excellent purification performance, heat resistance, durability, etc, and is appropriately used as the catalyst for removing carbon monoxide, hydrocarbons, and nitrogen oxides in the exhaust gas from an automobile, etc
11 citations
11 citations
Patent•
04 Aug 1989
TL;DR: In this paper, the authors proposed a method to remove readily and efficiently the catalyst components in the polymerization reaction mixture and obtain the polymer which is useful as an optical material by treating the reaction mixture resulting metathesis ring-opening polymerization of a specific monomer with an adsorbent.
Abstract: PURPOSE: To remove readily and efficiently the catalyst components in the polymerization reaction mixture and obtain the polymer which is useful as an optical material by treating the reaction mixture resulting metathesis ring- opening polymerization of a specific monomer with an adsorbent. CONSTITUTION: The metathesis ring-opening polymerization of a monomer mixture of (A) (i) a monomer of the formula (A, B are H, 1 to 10C hydrocarbon; halogen atom; m is 0, 1) or a mixture thereof with another monomer copolymerizable with component (i) is carried out in a solvent and the reaction mixture is treated with (B) an adsorbent such as activated clay, activated carbon, kieselguhr, activated alumina, zeolite or the like in the presence of (C) a compound of R-OH (R is H, 1 to 6C hydrocarbon) to give the subject polymer. COPYRIGHT: (C)1991,JPO&Japio
11 citations