Adsorption of NOM onto Activated Carbon: Effect of Surface Charge, Ionic Strength, and Pore Volume Distribution

Comparative Adsorption of Spiramycin on Veegum^®, Activated Charcoal and <i>Garcinia kola</i> Heckel (Guttiferea) Seed

“…The same influences seen with pH and ionic strength were reported by Bjelopavlic et al [20], who investigated the adsorption of reactive dyes on activated carbon.…”

“…Ionic strength significantly neutralizes any repulsive charge effects and can be expected to enhance adsorption, depending on whether the adsorbent is charged. Though high ionic strength is generally believed to favour adsorption [19], this relationship is complex because it is always interlinked with pH and charge effects, and both decreasing and increasing adsorption can occur with changes in ionic strength, depending on pH and other influences [20]. For a charged adsorbent where ion exchange influences are pronounced, the high concentration of sodium ions might be expected to compete with any protonated forms of spiramycin for the electrical double layers and ionic adsorption sites; however, indeed, the protonation of spiramycin in conditions of high sodium ion activity is very low, so that this competition may not exist.…”

Adsorption of humic acid onto pillared bentonite

“…Humic acid may exist in a spherical structure at lower pH but exist in a rather linear or stretched structure at higher pH [17,18]. Decrease of the molecular volume can facilitate the adsorption process due to greater availability of pores where humic acid molecules can penetrate [ 19]. It can also be seen from Fig.…”

Surface modification of carbon nanotubes for enhancing BTEX adsorption from aqueous solutions

“…The charge behavior of BTEX was determined by potentiometric acid/base titration method [17]. Sample was equilibrated for 15-20 min in 0.01 M NaCl solution.…”