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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8 citations
Journal Article•
TL;DR: In this article, the authors reviewed the fluoride uptake capacities of industrial byproducts, agricultural wastes and biomass materials from plants, grass, etc. and their modified forms as adsorbents in batch and column performance against different experimental limits.
Abstract: Fluoride and fluorosis issues are common in a few nations including India. Fluorosis is pandemic in more than 20 states of India. The fluoride comes into ground water by various ways, for example, weathering of rocks, industrial effluents and geochemical reactions. Alternate wellsprings of fluoride come to people in the form of air, foods, cosmetics, and so on.The traces of fluoride in ground water is beneficial for strengthening the dental enamel. Fluoride in overabundance amount higher than 1.5 mg/l causes dental and skeletal fluorosis other than infertility, kidney harm and affects nervous systems as well. The fluoride removal from drinking water and wastewater has been successful by different techniques, for example, coagulation and precipitation, adsorption, ion-exchange, membrane separation, dialysis, electro-dialysis, electrocoagulation and so on. Adsorption process for defluoridation has favoured for the most part in developing countries as it is techno-economical viable method, environmental friendly and straightforwardness in operation. The various adsorbents including activated carbon, activated alumina, metal oxides-hydroxides, bone chars and agricultural and industrial wastes were attempting to keep up the standard limit of fluoride concentration in drinking water by adsorption. Usage of plant materials and agricultural wastes as adsorbents are most adopted in developing country like India in light of the fact that they are low cost materials, available in abundance, biodegradable and natural existence. The industrial by-products are additionally needed to reuse them in advantageous ways for defluoridation as accessible in huge amount and economical. This paper reviews the fluoride uptake capacities of industrial by-products, agricultural wastes and biomass materials from plants, grass, etc. and their modified forms as adsorbents in batch and column performance against different experimental limits.
8 citations
Patent•
19 Nov 1971
TL;DR: In this paper, a process for producing acetone by catalytically oxidizing isobutyl aldehyde with an oxygen containing gas in the presence of a catalyst consisting of manganese oxide or manganes oxide and alkali metal hydroxide supported on activated alumina as carrier is described.
Abstract: A process for producing acetone by catalytically oxidizing isobutyl aldehyde with an oxygen containing gas in the presence of a catalyst consisting of manganese oxide or manganese oxide and alkali metal hydroxide supported on activated alumina as carrier.
8 citations
Patent•
07 Jun 1986
TL;DR: In this article, a honeycomb-shaped monolithic carrier is used to support a porous inorg substance, which is then used as a catalyst for purifying carbon monoxide and gaseous hydrocarbon in diesel exhaust gas.
Abstract: PURPOSE:To enhance the purification capacity of CO, by containing at least one component selected from metal V and a V-compound and one or more of a metal selected from Pt, Pd and Rh and/or a compound thereof as catalytically active substances CONSTITUTION:A porous inorg substance is supported by a honeycomb shaped monolithic carrier in a slurry form according to a coating method and this supported layer is immersed in a solution containing a compound of a platinum group metal selected from platinum, palladium and rhodium to support said compound before drying and a solution containing a vanadium compound to support said vanadium compound while the impregnated carrier is dried and baked to obtain a catalyst for purifying carbon monoxide and gaseous hydrocarbon in diesel exhaust gas As the material of the honeycomb shaped monolithic carrier, cordierite, mulite, alumina and a heat resistant metal are generally used As the porous inorg substance, activated alumina, silica or titania are pref
8 citations
TL;DR: Yan et al. as mentioned in this paper investigated the adsorption mechanism of arsenate (As(V)) on lanthanum-impregnated activated alumina (LAA) surface and showed that electrostatic interaction attracted As(V) anions to the LAA surface, and then arsenate could form monodentate configuration on the L AA surface at pH 5-9.
8 citations