2.4. Adsorption study
Batch experiments were carried out to measure the adsorption characteristics of RB 21 on FA and TFA. Prior to their use, both the adsorbents were dried in oven at 105°C for 1 hr. to eliminate traces of moisture. A series of 250ml graduated conical ﬂasks containing 100ml solution of each concentration (2.5, 10, and 50) mg/L of known amount (1.0g) of FA and TFA was prepared. Its adsorption isotherm was recorded. The mixture was kept in shaking incubator (Tempo) at 100rpm for various times (2-160 min.) to determine equilibrium time at different temperature 288,
298 and 308 K. After agitation, the suspension was separated by filtration using 0.45 µm membrane filter paper (Whatmann). The residual concentration of dye solution was determined at 665 nm using a standard calibration curve prepared at the corresponding maximum wavelength using a UV-Visible spectrophotometer. Langmuir and Freundlich isotherm were applied to evaluate the adsorption capacity of FA and TFA.
The nature of carbon monoxide adsorption on alumina supported platinum group metal catalysts was investigated using in-situ infra-red spectroscopy. Both adsorption and thermal desorption studies were made and the results combined to give a complete picture of the bonding schemes observed for each metal. In light of the conclusions drawn from this research, bimetallic samples were then investigated. The observations from these experiments were explained by comparison with the results from the constituent metals. When attempting to study the bonding schemes in more detail using an enhanced method of data collection, anomalous results were obtained. It was proposed that the species formed would be alumina carbonates, this was proven correct by comparison with the results from a standard preparation of these groups. Standard techniques for the analysis of catalysts and the treatment of results were developed during the course of this work.
Phd Thesis Adsorption | ghostwriter
Adsorption is a mass transfer process that involves transfer of adsorbate from liquid phase into solid phase, and it is divided into 3 steps: (i) boundary layer mass trans- fer across the liquid film surrounding the particle, (ii) in- ternal diffusion/mass transport within the particle bounda- ry as pore and/or solid diffusion, (iii) adsorption within the particle and/or on the external surface. In this study, the data obtained on the dependence of adsorption capacity with time were used for kinetic analysis. The adsorption