Aluminium hydroxide

About: Aluminium hydroxide is a research topic. Over the lifetime, 2043 publications have been published within this topic receiving 22032 citations. The topic is also known as: Al(OH)3 & Amphojel.

Solidifying and hardening accelerator for hydraulic binders

Abstract: The invention concerns novel liquid solidifying and hardening accelerators obtained by a process in which the following components: component a: basic aluminium salts and/or aluminium hydroxide; component b: aluminium sulphate and/or sulphuric acid; component c: organic carboxylic acids or mixtures of at least two of the organic carboxylic acids; component d: aluminium salts of organic carboxylic acids; component e: organic and/or inorganic sulphates and/or hydrogen sulphates and/or carbonates and/or hydrogen carbonates and/or alkaline earth oxides and/or alkaline earth hydroxides, are reacted in water at temperatures of up to 150 °C such that a solution is obtained, wherein: 1. all the components or a selection of the components react with one another such that the molar ratios of aluminium to sulphate in the end product are between 0.83 and 13.3 and the molar ratios of the aluminium to organic carboxylic acid are between 0.67 and 33.3; or 2. all the components apart from component e or a selection of the components apart from component e react with one another such that the molar ratios of aluminium to sulphate in the end product are between 0.83 and 13.3 and the molar ratios of aluminium to organic carboxylic acid in the end product are between 0.67 and 33.3; or 3. component e is subsequently dissolved in the reaction product according to point 2. The compounds can be used in combination with other compounds.

Aluminium-iron-amended activated bamboo charcoal (AIAABC) for fluoride removal from aqueous solutions

Abstract: In this study, the adsorption potential of aluminium-iron-amended activated bamboo charcoal (AIAABC), prepared from waste bamboo, for defluoridation of drinking water was investigated. The adsorbent (AIAABC) in which ABC was impregnated in AlCl3/FeCl3 solution and treated at 400 °C showed higher fluoride uptake capacity. The samples obtained were characterized and tested in batch mode. Inorganic particles were dispersed on the surface of carbon as indicated by SEM images and EDS. The main elements found in AIAABC were carbon, oxygen, aluminium, iron, sodium, and sulfur. Fluoride was associated with the aluminium hydro(oxide) (AO) particles in the pore spaces of ABC after adsorption. Specific surface area (SSA) was reduced from 80.5 to 3.7 m2/g, when ABC was impregnated with AO, indicating that the AO particles might cover the surface or pore spaces found in ABC. Maximum adsorption occurred at pH range from 5 to 9. The adsorption data were well fitted to Langmuir isotherm model with a maximum adsorption capacity of 21.1 mg/g. The adsorption process obeyed a pseudo–second–order rate equation. The adsorbent was effectively regenerated (85.7%) by 0.1% NaOH. Due to its high adsorption capacity compared to commercially available aluminium hydroxide–based adsorbents, AIAABC is a highly promising material for defluoridation of drinking water.