Adsorption of benzoic acid and hydroquinone by organically modified bentonites

Adsorption of benzoic acid by CTAB exchanged montmorillonite

“…Several studies have been reported in the literature on the adsorption by various materials, such as activated carbon (Chern and Chien, 2003;Ayranci et al, 2005), metal(hydr)oxides (Horányi, 2002), modified loess soil (Zhou et al, 2003) and mesoporous materials (Huang et al, 2004;Tozuka et al, 2005). However, very little information is available regarding the adsorption of benzoic acid by organomontmorillonite (Yıldız et al, 2005). We found that adsorptive capacity of CTAB-montmorillonite for benzoic acid is much better than that of natural montmorillonite.…”

Equilibrium and kinetic studies for the sorption of 3-methoxybenzaldehyde on activated kaolinites

“…In general, exothermic heats requisite for an adsorption process (unless adsorption is very weak) to compensate for loses in entrophy. However, there are many papers in the literature concerning the adsorption heats with positive values [14,36,43,44,57]. The negative values of Gibbs free energy of sorption ( G) indicated that the sorption of 3-methoxybenzaldehyde on the kaolinite surfaces were spontaneous.…”

Synthesis of organoclays and their application for the adsorption of phenolic compounds from aqueous solution

“…Hence, it needs to be modified to enhance adsorption capacity, and amine salts have been generally employed as costeffective reagents. Once hydrocarbon chain inserted into layers can increase interlayer distance and hydrophobic property, leading to higher affinity toward organic substances [4,5]. Organoclays, prepared by intercalating clays with surfactant cations, have been considered as potential sorbents for removing organic pollutants from water [6][7][8][9][10][11][12].…”