Adsorption of Phenol and 2,4‐Dinitrophenol on Activated Carbon Cloth: The Influence of Sorbent Surface Acidity and pH

Adsorption isotherm, kinetic and mechanism studies of some substituted phenols on activated carbon fibers

“…A possible reason is that the nitro group added on the ortho position withdraws the electron charged by the DNP anion, thus the electron density is dispersed and the electrostatic repulsion force between DNP and the ACFs surface is reduced. Vasiljevic et al [19] found that the uptake of DNP did not decrease heavily at high pH, in contrast to an obvious drop for that of phenol.…”

“…The effects of the molecular properties such as molecular size, solubility, pK a and electron distribution have been revealed, which might influence the affinity between the organics and the carbon surface [16][17][18]. Furthermore, the operational conditions such as solution pH and temperature are also involved in the adsorption, which might have implications on the adsorbent/adsorbate interactions [19,20].…”

Development of a new efficient and economical magnetic sorbent silicone surfactant-based activated carbon for the removal of chloro- and nitro-group phenolic compounds from contaminated water samples

“…The repulsion that occurs between the phenolate ion and hydroxyl ion (–OH) on the adsorbent surface causes the removal to decline as the pH increases. 39 pH 4, which is the natural pH of 2,4-DNP solution, was finalized as the optimum pH for this system since no significant increase was noted between the highest removal percentage (pH 6) and pH 4. The results of both analytes towards the adsorbent are depicted in Fig.…”

Development and Environmental Applications of Activated Carbon Cloths

“…The influence of the surface acidity of activated carbon cloths and of the solution pH on the adsorption of phenol and 2,4-dinitrophenol, as model compounds with very different pKa values, was also investigated [168]. Phenol adsorption was found to be favored by low solution pH values and high point of zero charge of the samples.…”