Effect of ultrasound on desorption kinetics of phenol from polymeric resin

Abstract

This work mainly involves the study of desorption kinetics of phenol from polymeric resins under the influence of an ultrasound field. A new phase equilibrium-kinetics model (PEKM), for estimation of diffusion coefficient was proposed, kinetic experiments of phenol desorption on NKA-II resin in the presence and the absence of ultrasound were separately conducted, and diffusion coefficients of phenol within an adsorbent particle were estimated by means of proposed PEKM. Results showed that the use of ultrasound could enhance the diffusion of phenol within the resin. The diffusion coefficient of phenol in the resin in an ultrasonic field increased by an order of magnitude in comparison with the diffusion coefficient in the absence of ultrasound. The more intense the ultrasonic field the larger was the diffusion coefficient.

Ultrasonication-Assisted Sorption of Cadmium from Aqueous Phase by Wheat Bran

“…In our previous work, we have shown that the adsorption equilibrium was shifted to lower adsorbed amounts when investigating the adsorption of 4-chlorophenol onto granular activated carbon using an ultrasonic reactor operating at a frequency of 21 kHz. Similar results were reported by Breitbach and Bathen, Li et al., , and Ji et al for the adsorption of fructose on microporous resin, phenol onto polymeric resin, and Genipisode on polymeric resin, respectively. In all cases, ultrasound is able to intensify both the mass transfer as well as the rate of sorption.…”

“…[3][4][5][6] Many researchers have studied the effects of ultrasound on adsorption processes. [7][8][9][10][11][12][13][14][15][16][17] Ultrasonic waves accelerate mass transport phenomena and thus enhance and improve the sorption rate, but the influence of ultrasound on the sorbed amount at equilibrium and adsorption equilibrium isotherms is very controversial and contradictory. In an earlier work, 7 we have shown that the measured adsorption isotherms shifted toward lower loading in the presence of the ultrasonic field for the adsorption of p-chlorophenol onto granular activated carbon.…”

Adsorption–Desorption Behavior of Cadmium(II) and Copper(II) on the Surface of Nanoparticle Agglomerates of Hydrous Titanium(IV) Oxide

“…This has been carried out by the workers − mainly with the help of counter adsorption techniques and the use of some chemicals, which can replace the adsorbed substances. The use of ultrasonic sound waves has also been reported for the recovery of phenol from an adsorbent surface. Desorption phenomena are now being redefined by analyzing them quantitatively using some tools to take a deeper insight into the process …”

Feasibility study on power ultrasound for regeneration of silica gel—A potential desiccant used in air-conditioning system

“…They assumed that the acoustic cavitation caused by ultrasound could help enhance desorption of volatile organic compounds (e.g. trichloroethylene, phenol and 4-chlorophenol) from activated carbon and polymer resins [9][10][11][12][13]. It should be noted that the cavitation only occurs in liquid phase.…”