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 article, the regeneration of the activated alumina (AA) bed saturated by fluoride ions has been studied using an electrochemical cell which regenerates several saturated adsorbent bed.
29 citations
Patent•
02 Jul 1997
TL;DR: In this paper, a method of preparing an alumina-based bodies suitable for use as an adsorbent or catalyst was proposed, the method comprising providing a source of activated alumina powder for forming into bodies and providing an aqueous solution containing at least two different alkali metals, at least one alkali metal derived from a soluble carboxylic acid alkali salt.
Abstract: A method of preparing an alumina-based bodies suitable for use as an adsorbent or catalyst, the method comprising providing a source of activated alumina powder for forming into bodies and providing an aqueous solution containing at least two different alkali metals, at least one alkali metal derived from a soluble carboxylic acid alkali metal salt. As said powder is formed into said bodies, the bodies are contacted or sprayed with the aqueous solution to provide composite bodies containing the alumina powder and the alkali metals and the soluble carboxylic acid alkali metal salt. Alternatively, the alumina bodies may be formed first and then contacted, e.g., soaked in the aqueous solution. Or, a viscous slurry of the activated alumina powder and the aqueous solution may be made. The viscous slurry may be made into bodies by extrusion or by the oil drop method. Thereafter, the bodies are thermally treated to activate alumina therein and remove or decompose the organic part, e.g., carboxylic acid, of the soluble carboxylic acid alkali metal salt.
29 citations
TL;DR: Inverse gas chromatography has been used to evaluate the adsorption parameters of some probes and it was found that benzene exhibits more negative deltaH than for n-hexane and cyclohexane on molecular sieves 3A and 5A and alumina.
29 citations
TL;DR: Seven household treatment technologies for the removal of arsenic were evaluated using water from 63 different tube wells taken from 3 different regions of Bangladesh and it became clear that such technologies can increase the risk of bacterial contamination in the treated water and this needs serious consideration.
Abstract: Seven household treatment technologies for the removal of arsenic (Alcan, BUET, DPHE/DANIDA, Garnet, Sono, Stevens, Tetrahedron) were each evaluated using water from 63 different tube wells taken from 3 different regions of Bangladesh. The technologies that were evaluated were chosen from those that appeared user friendly, readily available and whose promoters were open to participate in the study. Arsenic concentrations in feed and treated waters were analysed by the PeCo 75 arsenic field test kit, AA-hydride generation and ICP-AES. Feed water arsenic concentrations were found to be up to 600 µg l−1. The more advanced treatment methods using: activated alumina (Alcan, BUET); metallic iron (Sono); anionic exchange resin (Tetrahedron) and iron coagulation (Stevens) were found to be most easily used and efficiently reduced arsenic concentrations to below the Bangladesh drinking water standard (0.05 mg As l−1). The use of aluminium sulphate coagulants and permanganate oxidants in the DPHE/DANIDA technology i...
29 citations