Reusable adsorbents for dilute solution separation. 4: Adsorption of 1,2 dichlorobenzene and phenanthrene on a surfactant-modified semiconductor (titania) surface

Yuan, Qingzhong; Jain, Preeti; Valsaraj, Kalliat T.

doi:10.1016/s1383-5866(00)00181-7

Cited by 10 publications

(1 citation statement)

References 20 publications

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“…Co-adsorption of PAHs on surfactant monolayers on solid surfaces and water surfaces are well known. 14,30 If the second mechanism is operative, it will add another term to given by C C K CW , where K CW is the DOC/water partition constant of the PAH and C C is the DOC concentration. Increasing C C increases the solubilization of the PAHs in water containing dissolved colloidal carbon.…”

Section: Raja and Valsarajmentioning

confidence: 99%

Uptake of Aromatic Hydrocarbon Vapors (Benzene and Phenanthrene) at the Air-Water Interface of Micron-Size Water Droplets

Raja

Valsaraj

2004

Journal of the Air & Waste Management Association

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Uptake of aromatic hydrocarbon vapors (benzene and phenanthrene) by typical micrometer-sized fog-water droplets was studied using a falling droplet reactor at temperatures between 296 and 316 K. Uptake of phenanthrene vapor greater than that predicted by bulk (air-water)-phase equilibrium was observed for diameters less than 200 microm, and this was attributed to surface adsorption. The experimental values of the droplet-vapor partition constant were used to obtain the overall mass transfer coefficient and the mass accommodation coefficient for both benzene and phenanthrene. Mass transfer of phenanthrene was dependent only on gas-phase diffusion and mass accommodation at the interface. However, for benzene, the mass transfer was limited by liquid-phase diffusion and mass accommodation. A large value of the mass accommodation coefficient, alpha = (1.4 +/- 0.4) x 10(-2) was observed for the highly surface-active (hydrophobic) phenanthrene, whereas a small alpha = (9.7 +/- 1.8) x 10(-5) was observed for the less hydrophobic benzene. Critical cluster numbers ranging from 2 for benzene to 5.7 for phenanthrene were deduced using the critical cluster nucleation theory for mass accommodation. The enthalpy of mass accommodation was more negative for phenanthrene than it was for benzene. Consequently, the temperature effect was more pronounced for phenanthrene. A linear correlation was observed for the enthalpy of accommodation with the excess enthalpy of solution. A natural organic carbon surrogate (Suwannee Fulvic acid) in the water droplet increased the uptake for phenanthrene and benzene, the effect being more marked for phenanthrene. A characteristic time constant analysis showed that uptake and droplet scavenging would compete for the fog deposition of phenanthrene, whereas deposition would be unimpeded by the uptake rate for benzene vapor. For both compounds, the characteristic atmospheric reaction times were much larger and would not impact fog deposition.

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Section: Raja and Valsarajmentioning

confidence: 99%

Uptake of Aromatic Hydrocarbon Vapors (Benzene and Phenanthrene) at the Air-Water Interface of Micron-Size Water Droplets

Raja

Valsaraj

2004

Journal of the Air & Waste Management Association

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Removal of Disperse Dyes from Water Using Surfactant Treated Alumina

Gawade

Vanjara

Sawant

2005

Jnl Chinese Chemical Soc

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An alumina surface was modified by adsorption of an anionic surfactant, sodium dodecyl sulfate (SDS). Typical S-shaped isotherm of surfactant on alumina was observed. The adsorption of Disperse Red-11, Disperse Blue-26 and Disperse Red-156 on alumina and surfactant treated alumina has been investigated. The enhancement in adsorption of these disperse dyes on surfactant treated alumina is observed, which may be attributed to their solubilization in surfactant aggregates formed at the solid/liquid interface. The effect of pH on adsorption has been studied. The adsorption is greatly influenced by pH of the medium. The applicability of the Langmuir model and the Dual-Mode sorption model (DSM) were tested for equilibrium data.

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Modified and Nonmodified TiO2 Nanoparticles for Environmental Applications

Belessi

Petridis

2014

The Role of Colloidal Systems in Environmental Protection

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Reusable adsorbents for dilute solution separation. 4: Adsorption of 1,2 dichlorobenzene and phenanthrene on a surfactant-modified semiconductor (titania) surface

Cited by 10 publications

References 20 publications

Uptake of Aromatic Hydrocarbon Vapors (Benzene and Phenanthrene) at the Air-Water Interface of Micron-Size Water Droplets

Uptake of Aromatic Hydrocarbon Vapors (Benzene and Phenanthrene) at the Air-Water Interface of Micron-Size Water Droplets

Removal of Disperse Dyes from Water Using Surfactant Treated Alumina

Modified and Nonmodified TiO2 Nanoparticles for Environmental Applications

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