Abstract
Abstract Chemical modification techniques were developed to create new composite adsorbents from elutrilithe to improve the removal of neutral, anionic and cationic organic and inorganic pollutants from water. A chemical activation of the elutrilithe, resulting from reactions with metal salts and gibbsite or boehmite at high temperature 700°C in the absence of oxygen, composite adsorbents were developed for an efficient treatment of waste waters. The activated products were characterised in terms of surface area, and micropore volume and evaluated in terms of affinity and capacity for a number of organic compounds. Relations between the organic compounds and their molecular size, pKa, pH and adsorption temperature were investigated. The presence of gibbsite or boehmite during the modification process gives rise to a composite adsorbent suitable for the removal of anionic and cationic organic or inorganic compounds from waste water. Preliminary tests in pre-pilot installations confirmed the results obtained on lab scale. The preparation of the new composite adsorbent is cheap with an ease of handling. From comparative experiments, it was obvious that the modified elutrilithe adsorbents show a superior affinity and capacity compared to the classical excisting sorbents in the removal of pollutants from waste water.
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