Adsorption of polyethylene glycol (PEG) from aqueous solution onto hydrophobic zeolite

Chang, Ching‐Yuan; Tsai, Wen‐Tien; Ing, Chieng Hei; Chang, Ching‐Yuan

doi:10.1016/s0021-9797(02)00174-1

Cited by 86 publications

(47 citation statements)

References 21 publications

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“…The energy of adsorption remains constant. The Freundlich adsorption isotherm is a nonlinear empirical formula (Chang et al 2003). Assuming that adsorption is happening on a non-homogeneous surface, with the increase in adsorption capacity, adsorption energy will logarithmically reduce to adsorption equilibrium (Ng et al 2003;Seader and Henly 2006).…”

Section: Adsorption Isotherms and Adsorption Kineticsmentioning

confidence: 99%

Sorption of heavy metals from aqueous solution by dehydrated powders of aquatic plants

Deng

Liu

Zeng

et al. 2013

Int. J. Environ. Sci. Technol.

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Ruppia maritima and Echinodorus amazonicus were prepared in a dehydrated powder form. The characteristics and mechanisms of adsorption of heavy metals were studied under various pH values, reaction times, and heavy metal ion concentrations. The results showed that under different pH and reaction time conditions, heavy metal adsorption was leadThe adsorption of lead increased linearly with the lead concentration. For cadmium, zinc and copper, the adsorption was saturated when metal ion concentration exceeded 200 mg/L. When a Freundlich model was applied, R 2 values for the heavy metal adsorption by the aquatic plants mostly exceeded 0.9. The adsorption of heavy metal ions by these two aquatic plant powders was better explained by the Lagergren second-order equation than the first-order equation. From the Fourier Transform Infrared spectra, there was an adsorption peak at 2,115 cm -1 for R. maritima. The peak shape did not change with metal affiliation except there was a shift of peak wavelength before adsorption. The results indicate that the mechanism of heavy metal adsorption by the two species is not simply on the mono-molecular layer level, and that intra-particulate dispersal is the dominant process. Heavy metal pollution does not affect the basic chemical components, and major substances involved in heavy metal adsorption including carbohydrates, cell wall pectin, and protein functional groups.

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Section: Adsorption Isotherms and Adsorption Kineticsmentioning

confidence: 99%

Sorption of heavy metals from aqueous solution by dehydrated powders of aquatic plants

Deng

Liu

Zeng

et al. 2013

Int. J. Environ. Sci. Technol.

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“…The temperature was kept constant at 20 • C during all the adsorption tests. The sampling times were 2, 4,6,8,10,15,20,25,30,35,40,45,50,60, and 120 min since majority of the adsorbate was consumed within an hour. Each bottle was used to obtain only a single sample to minimize accumulation of experimental error.…”

Section: Methodsmentioning

confidence: 99%

“…The first-order model [4] is the classical example and has been employed in numerous systems [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The rate equation and its solution in terms of fractional adsorbate concentration in solution are in the form The other widely used model is the second-order kinetic model [24][25][26][27], (2) dχ(t) dt = −K 2 χ(t) 2 and χ(t) = 1 1 + K 2 t .…”

Section: Introductionmentioning

confidence: 99%

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Polat

2006

Journal of Colloid and Interface Science

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A phenomenological multilayer adsorption model for a well-dispersed, homogeneous, nonporous adsorbent and a molecular adsorbate is presented. The model provides explicit kinetic expressions associating the adsorbed amounts to the fraction of the surface occupied and reduces to the first-and second-order adsorption models for special cases. Parameters of the model are a pair of true rate constants related to the adsorbateadsorbent and adsorbate-surface adsorbate affinities. A general graphical procedure and analytical equations for special cases are provided to estimate the rate constants from kinetic adsorption data. Data from the adsorption of sodium stearate onto α-alumina from water were used to test the model. The predicted values of the rate constants suggested that the stearate was distributed homogeneously on the alumina surface and essentially adsorbed as a monolayer before starting to form the second layer.

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“…It is possible that the transport of the adsorbate into the pores of the adsorbent is the rate controlling step in a batch reactor with rapid stirring (Weber and Morris, 1963;Poots et al, 1978). This could be attributed to the boundary layer diffusion effect, while the final linear portions might be due to the intraparticle diffusion effect (Chang et al, 2003). The straight line did not pass through the origin, which indicated that the intraparticle diffusion was not the only rate-controlling step (Özcan et al, 2004).…”

Section: Kinetic Study and Intraparticle Diffusionmentioning

confidence: 99%

Nickel Ion Adsorption Behavior of Ceriporia lacerata Isolated from Mine Tailings in Korea

Kim¹,

Lim²,

Oh³

et al. 2015

Journal of Soil and Groundwater Environment

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In the present study, surface of laccase producing Ceriporia lacerata was modified using 4-bromobutyryl chloride and polyethylenimine. The modified biomass was freeze dried and utilized as a biosorbent for the removal of Ni(II) from aqueous solution. The physicochemical properties of the biosorbent were analyzed using scanning electron microscopy and Fourier transform infrared spectroscopy. Batch experiments were carried out as a function of contact time (0-60 min), pH (2 to 8), adsorbent dosage (25-150 mg), and initial Ni(II) concentration (25-125 mg/L). The results indicate that surface modified biosorbent effectively adsorbed (9.5 mg/0.1 g biomass) Ni(II) present in the solution. The equilibrium adsorption data were modeled with different kinetic and isotherm models. The Ni(II) adsorption followed pseudo-first-order kinetics (R 2 = 0.998) and Langmuir isotherm (R 2 = 0.994) model. Hydroxyl and carbonyl functional groups present in biomass play a major role in the adsorption of Ni(II). The adsorbed Ni(II) from the biosorbent was successfully desorbed (85%) by 1 M HCl. The results of the study indicate that the surface modified C. lacerate biomass could be used for the treatment of Ni(II) contaminated ground waters.

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Adsorption of polyethylene glycol (PEG) from aqueous solution onto hydrophobic zeolite

Cited by 86 publications

References 21 publications

Sorption of heavy metals from aqueous solution by dehydrated powders of aquatic plants

Sorption of heavy metals from aqueous solution by dehydrated powders of aquatic plants

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Nickel Ion Adsorption Behavior of Ceriporia lacerata Isolated from Mine Tailings in Korea

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