Adsorption kinetics of polyethylene glycol from aqueous solution onto activated carbon

Abstract

The adsorption equilibrium and kinetics of polyethylene glycol (PEG) in three aqueous systems were examined in this study. Langmuir isotherm was used to satisfactorily predict the adsorption capacity of PEG on activated carbon F-400 and applied to the investigation of adsorption kinetics. The surface diffusion, pore diffusion, and branched pore kinetics models successfully described the adsorption behavior of PEG on F-400 in the completely stirred tank reactor. The pore diffusion coefficients obtained from the pore diffusion model were compared with those computed by the experimental data of the short fixed-bed reactor combined with the assumption of non-hindered pore diffusion. In addition, the effects of initial concentrations of PEG and the relative importance of external and internal mass transfers for the adsorption were also taken into account and discussed in this study.

Revisiting molecular adsorption: unconventional uptake of polymer chains from solution into sub-nanoporous media

“…Porous materials such as porous carbons, silicas, and zeolites are capable of adsorbing polymers in their voids via physisorption from a solution phase. For example, solutionphase adsorptions of polystyrene 8,9 and polyethylene oxide (PEO) [10][11][12][13][14] with molecular weight (MW) greater than $5 kg mol À1 into common porous adsorbents such as activated carbon (pore diameter, d $ 1.8 nm), 14 silica (d ¼ 7-100 nm), [8][9][10][11][12] and FAU-type zeolite (d ¼ 1.6 nm) 13 were studied in order to understand the adsorption thermodynamics, kinetics, diffusion, and connement effects on the adsorbed polymers. In such traditional systems, porous adsorbents that contain pores comparable to or larger than the hydrodynamic diameter of polymer adsorbates have been commonly used because potential void accessibility is considered a prerequisite for polymer admission.…”

Kinetics and equilibrium of desorption removal of copper from magnetic polymer adsorbent

“…The heavy metal-containing sludge after stabilization or solidification to meet the regulation standards is then disposed in the landfill of hazardous materials. The organics in wastewater can be handled by the traditionally biological processes of the secondary treatment and/or the activated carbon adsorption [2][3][4] and advanced oxidation processes [5][6][7] of the tertiary treatment so as to meet the effluent standards. Nevertheless, either chemical precipitation or biological treatment can cause the sludge problem.…”

Understanding Sorption Behavior and Properties of Radionuclides in the Environment

“…The equation for the pseudo-second-order is based on sorption equilibrium capacity [62][63][64]. The equation is written as Eq.…”