The influence of the texture and surface properties of carbon adsorbents obtained from biomass products on the adsorption of manganese ions from aqueous solution

Preparation, characterization and application of polystyrene based activated carbons for Ni(II) removal from aqueous solution

“…Thus adsorbents with prevailing acidic surface are expected to be a better choice for the removal of positively charged Ni(II) ions. The development of acidic surface groups on AC surface can be carried out by low temperature activation in the presence of air as oxidant [42][43]. On the other side, ACs with well developed surface area and high presence of microporous can also be considered as favorable adsorbents for Ni(II) removal from aqueous solutions due to the small size of Ni(II) species (Ni metallic radius is 0.125 nm).…”

Removal of copper from aqueous solutions by adsorption onto chestnut shell and grapeseed activated carbons

“…It is known that increase of pH decreases the competition between the hydronium and metal ions for surface sites and results in increased uptake of metal ions by the activated carbon. Carbon samples in aqueous solutions carry a surface charge, which is very much dependent on the pH of the solution and the results might be explained by the changes in the carbon surface charge at different pH values [3,49].…”

Mercury removal from aqueous solution by adsorption on activated carbons prepared from olive stones

“…The carbon surface-mercuric ion interaction was favoured by the presence of oxygen surface groups on the adsorbent, which make the carbon more hydrophilic (Savova et al 2003). It has been shown that the pre-oxidation treatment introduced carboxylic groups which evolved as CO 2 under thermal decomposition, and phenolic groups which decomposed at higher temperatures as CO.…”