Effects of ultrasound on adsorption equilibrium of phenol on polymeric adsorption resin

Zhong, Li; Li, Xiangbin; Xi, Hongxia; Ben, Hua

doi:10.1016/s1385-8947(01)00301-1

Cited by 73 publications

(33 citation statements)

References 6 publications

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“…However, it is apparent that sonication induced higher PAH concentrations in methanol at equilibrium with similar effects reported in previous studies. [26][27][28] During sonication, bubbles are generated and subsequently collapse, in a process termed cavitation, inducing conditions of several thousand Kelvin and a few hundred bar. Near a solid surface, such as a polymeric matrix, asymmetric bubble collapse forms ''microjets'' reaching speeds up to 500 m/s, which along with sonic shockwaves can break up of interactions between sorbed molecules and sorbent surfaces.…”

Section: Pah Release Under Non-sonicated Conditionsmentioning

confidence: 99%

“…Sonically induced shifts of this nature (towards increased desorption) have been observed for a number of solute-polymer combinations. [26][27][28] With the exception of BaP, the percent increase in partitioning coefficient shifts induced via sonication decreased as a function of PAH hydrophobicity (displayed in Table 2). This was not surprising as interactions between non-polar Desmopan (polyurethane) and PAHs, likely increased as a function of permeant hydrophobicity.…”

Section: Quantification Of Diffusive and Equilibrium Properties For Smentioning

confidence: 99%

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Mass transport and thermodynamic analysis of PAHs in partitioning systems in the presence and absence of ultrasonication

Isaza

Karan

2010

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Transport of PAHs from Desmopan polymers to methanol under various mixing conditions and in the presence of ultrasound was analyzed. PAH transport was influenced by external transport resistances; however, agitation greater than 800 rpm yielded PAH transport completely limited by internal resistances. Delivery rates of phenanthrene, fluoranthene, and pyrene with ultrasonication were faster than that under any mixing condition, suggesting enhanced internal transport properties. Ultrasound also induced increased concentrations of PAHs in solution at equilibrium. The model developed described PAH delivery under sonicated/non-sonicated conditions, while quantifying diffusive and thermodynamic properties. Diffusivities with and without ultrasound decreased with permeant molecular size agreeing with coefficients determined for similar aromatic compounds in polymers. Partitioning coefficients under sonicated and non-sonicated conditions conclusively differed from each other and decreased as a function of PAH molecular size. Quantitative structure-property relationship data of PAHs yielded factors predicting thermodynamic and transport behaviors, with polarizability being the best descriptor. V V C 2010 American Institute of Chemical Engineers AIChE J,

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Section: Pah Release Under Non-sonicated Conditionsmentioning

confidence: 99%

Section: Quantification Of Diffusive and Equilibrium Properties For Smentioning

confidence: 99%

Mass transport and thermodynamic analysis of PAHs in partitioning systems in the presence and absence of ultrasonication

Isaza

Karan

2010

AIChE Journal

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“…In this framework, activated carbon (Dabrowski et al 2005;Ö zkaya 2006;Kumar et al 2007;Din et al 2009;Kilic et al 2011;Dhorabe et al 2016a;Ingole and Lataye 2013;Ingole et al 2017;Sáenz-Alanís et al 2017;Lorenc-Grabowska 2016;Srivastava et al 2006) is still the most widely used material, although it has disadvantages, such as high initial cost, high regeneration cost, and the generation of carbon fines, due to its brittle nature. Alternative adsorbents include naturally occurring materials such as different powder-based earth minerals (zeolite, bentonite, clinoptilolite) (Banat et al 2000;Mangrulkar et al 2008;Sprynskyy et al 2009), polymeric resins (Caetano et al 2009;Lin and Juang 2009;Juang and Shiau 1999;Li et al 2002;Vázquez et al 2007), polysaccharides (chitin, chitosan) (Li et al 2009;Dursun and Kalayci 2005;Ahmaruzzaman and Sharma 2005), or other inexpensive and renewable biomassresource materials (coconut shell, rice husk, ash, beet pulp etc.) (Din et al 2009;Ahmaruzzaman 2005;Chaudhary and Balomajumder 2014;.…”

Section: Introductionmentioning

confidence: 99%

In-situ synthesised hydroxyapatite-loaded films based on cellulose nanofibrils for phenol removal from wastewater

2017

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Phenol removal from aqueous medium was studied by the batch method using novel and fully biobased solvent-cast films prepared from cellulose nanofibrils (CNFs) and in situ synthesised hydroxyapatite (HAp) by the wet-chemical precipitation method and different concentrations of HAp precursors and weight mass of CNFs. The chemical and morphological structures of as-prepared films were investigated by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy, while their physical properties were determined by water contact angle and swelling kinetic measurements. The HAp precursor leads to a surface modification of CNFs, which increases its activity by forming differently structured, sized and distributed HAp particles, influencing the phenol adsorption kinetic and capacity. The phenol adsorption was faster and higher (*64 mg g -1 ) in an acidic solution (pH 2) compared to the original phenol solution pH (pH 7.4, *30 mg g -1 ) using films with unevenly-distributed and positively-charged calcium-richer HAp particles synthesised on the CNFs' surface, being reflected also in its higher water swelling properties, compared to their hybrid counterparts. The phenol adsorption is identified to follow pseudo-second order kinetic and intra-particle diffusion models. A highly-efficient reusing ability of the selected film with 86% adsorption capacity of the initial value at the third sequential regeneration cycle, is also confirmed. A super-hydrophilic nature of the films with high water-diffusing and transport properties, as well as low swelling, indicates their potential in the development of highlyeffective adsorbents and, potentially, filter membranes for water purification.

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“…The aim was to disrupt any associations of this nature by exposing the feed water to an ultrasonic field prior to membrane treatment. Ultrasound can decrease the adsorption of phenol on polymeric adsorption resins (Li et al, 2002). Other examples where ultrasound reduces the interaction of adherent particles are cell detachment (Ohl and Wolfrum, 2003) and the de-aggregation of soil and NOM (Eriksenn et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Ultrasound enhancement of microfiltration performance for natural organic matter removal

Tran

Gray

Bolto

et al. 2007

Organic Geochemistry

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Sonication of water at 1500 W power prior to microfiltration showed that short sonication times (60 s) gave a reduced flux decline. It is suggested that a less potent, smaller molecular form of the natural organic matter (NOM) was produced by sonication. Longer sonication times diminished this beneficial effect. This may be due to the formation of aggregates or compounds that are more readily adsorbed on the membrane.Where the sonication was preceded by an alum treatment, the flux loss showed a regular decrease with longer sonication times. It is suggested that the effects of sonication on the alum flocs and on the flocs; NOM interactions may play a critical role in regulating the flux. Where sand was present on sonication at 800 and 1400 W, the cavitational energy was focussed on adsorbed organic material, resulting in more efficient destruction and the formation of compounds that counteracted the flux enhancement.

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Effects of ultrasound on adsorption equilibrium of phenol on polymeric adsorption resin

Cited by 73 publications

References 6 publications

Mass transport and thermodynamic analysis of PAHs in partitioning systems in the presence and absence of ultrasonication

Mass transport and thermodynamic analysis of PAHs in partitioning systems in the presence and absence of ultrasonication

In-situ synthesised hydroxyapatite-loaded films based on cellulose nanofibrils for phenol removal from wastewater

Ultrasound enhancement of microfiltration performance for natural organic matter removal

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