Adsorption of Acetaldehyde, Propionaldehyde, and Butyraldehyde on Silica Gel

Ghosh, Tushar K.; Hines, Anthony L.

doi:10.1080/01496399008051840

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The subsequent decrease in the values of heat of adsorption can be attributed to the heterogeneity of the surface and multilayer coverage. 45 It is expected that amine groups in chitosan will be homogeneous energetically and, therefore, a constant heat of adsorption should be obtained. However, the substrate perlite is not expected to be homogeneous energetically.…”

Section: Resultsmentioning

confidence: 99%

“…The initial increase in the heat of adsorption may be attributed to lateral interactions between the adsorbed Cd ions, which are known to form complex molecules on a solid surface. The subsequent decrease in the values of heat of adsorption can be attributed to the heterogeneity of the surface and multilayer coverage . It is expected that amine groups in chitosan will be homogeneous energetically and, therefore, a constant heat of adsorption should be obtained.…”

Section: Resultsmentioning

confidence: 99%

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Adsorption of Divalent Cadmium (Cd(II)) from Aqueous Solutions onto Chitosan-Coated Perlite Beads

Hasan¹,

Krishnaiah²,

Ghosh³

et al. 2006

Ind. Eng. Chem. Res.

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133

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Chitosan-coated perlite beads were prepared in the laboratory via the phase inversion of a liquid slurry of chitosan dissolved in oxalic acid and perlite to an alkaline bath for better exposure of amine groups (NH 2 ). The NH 2 groups in chitosan are considered active sites for the adsorption of heavy metals. The beads were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) microanalysis, which revealed their porous nature. The chitosan content of the beads was 32%, as determined using a thermogravimetric method. The adsorption of Cd 2+ from an aqueous solutions on chitosan-coated perlite beads was studied under both equilibrium and dynamic conditions in the concentration range of 100-5000 ppm. The pH of the solution was varied over a range of 2-8. The adsorption of Cd 2+ on chitosan was determined to be pH-dependent, and the maximum adsorption capacity of chitosan-coated perlite beads was determined to be 178.6 mg/g of bead at 298 K when the Cd(II) concentration was 5000 mg/L and the pH of the solution was 6.0. On a chitosan basis, the capacity was 558 mg/g of chitosan. The XPS data suggests that cadmium was mainly adsorbed as Cd 2+ and was attached to the NH 2 group. The adsorption data could be fitted to a two-site Langmuir adsorption isotherm. The data obtained at various temperatures provided a single characteristic curve when correlated according to a modified Polanyi's potential theory. The heat of adsorption data calculated at various loadings suggests that the adsorption was exothermic in nature. It was noted that a 0.1 N solution of HCl could remove the adsorbed cadmium from the beads, but a bed volume of approximately three times the bed volume of treated solution was required to completely remove Cd(II) from the beads. However, one bed volume of 0.5 M ethylenediamine tetra acetate (EDTA) solution can remove all of the adsorbed cadmium after the bed became saturated with Cd(II) during dynamic study with a solution containing 100 mg/L of cadmium. The diffusion coefficient of Cd(II) onto chitosan-coated beads was calculated from the breakthrough curve, using Rosen's model, and was determined to be 8.0 × 10 -13 m 2 /s.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Adsorption of Divalent Cadmium (Cd(II)) from Aqueous Solutions onto Chitosan-Coated Perlite Beads

Hasan¹,

Krishnaiah²,

Ghosh³

et al. 2006

Ind. Eng. Chem. Res.

Self Cite

133

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“…Hines and Ghosh (1993) [5] studied the competitive adsorption of propane-propylene mixture on silica gel, which revealed that silica gel has the greatest selectivity for propylene compared with molecular sieve 13X and activated carbon. Ghosh and Hines (1990) [6] obtained the adsorption equilibrium experiment data of acetaldehyde, propionaldehyde and butyraldehyde on silica gel respectively. Strøm-Tejsen et al (2008) [7] proved that the improvement of the indoor air quality has a certain effect when the silica gel wheel was used by investigating passengers' perception.…”

Section: Introductionmentioning

confidence: 99%

The Simulation of Trace Gas Pollution Adsorption on Silica Gel

Rong¹,

Pang

Wang

et al. 2015

Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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Silica gel has a potential ability to adsorb water vapor and contaminant together, so it has been focused recently in indoor air environment. In this paper, the performance of silica gel adsorbing trace gas pollutions in isothermal column is studied through theoretical methods. The model of the adsorption column system was set up based on mass conservation, linear driving force model and Henry's Law. An implicit differential method was used to solve the model in the Matlab environment and to obtain the breakthrough curves. Seven simulation experiments were conducted to discuss the effect of overall mass transfer coefficient, Henry parameter and gas velocity on adsorption process. From the result it indicated that the overall mass transfer coefficient impacts the breakthrough point enormously. Henry parameter reflects the adsorption capacity of adsorbent particle, high Henry constant affords long lifespan of adsorbent. Furthermore, high efficient and long-term use of adsorbent cannot obtain without reasonable gas velocity.

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