Papers by Keyword: Adsorbate

Abstract: This paper dwells upon finding the specific surface area of cake, a coal enrichment waste, exposed to electroplasma treatment; the goal is to make an organomineral porous material to be used as a sorbent for wastewater treatment. The research team used a monomolecular Langmuir adsorption model and surface tension of the surfactants before and after adsorption at the interface of solution and solid adsorbent. Another process considered herein was thermal activation of substances in the electroplasmic reactor for making organomineral porous materials from coal cakes. The paper presents the resulting specific surfaces area of the organomineral sorbent thus produced. Thus, the waste of flotation, i.e. coal cake, is fundamentally suitable for making porous substances by thermal destruction in an electroplasma reactor.

Abstract: Equilibrium adsorption of quaternary component mixture (phenol, butanol, butan-2-ol and 2-methyl butan-2-ol) onto activated carbon derived from oil-palm empty fruit bunch was studied. Henry isotherm 2-parameter model was used as an improvement to Langmuir and Freundlich 2-parameter isotherm model. The 3-parameter isotherm models applied to the quaternary adsorption system included Redlich Peterson, Sips and Toth. Trial and error method of excel solver was used to evaluate the parameters in the models. Data fitness was based on correlation coefficient (R2) and average percentage error (APE). For the two-parametric isotherm models, Langmuir predicted the adsorption equilibrium well with APE and R2 values of 0.20883 and 0.9868; 0.007669509 and 0.9338; and 3.64355718 and 0.9410 for butanol, butan-2-ol and 2-methyl butan-2-ol respectively. The maximum mono-layer capacity (qm) obtained from Langmuir model for butanol, butan-2-ol and 2-methyl butan-2-ol adsorption were 3558.962mg/g, 2.064233mg/g and 22.6423mg/g respectively. Sip and Toth fitted excellently well among the three- parametric isotherm models. The Sip isotherm model gives APE and R2 values of 0.010536 and 0.9346; and 5.14458 and 0.9250 for phenol and 2-methyl butan-2-ol respectively. The Toth isotherm model gives APE and R2 values of 4.83521 and 0.9866; and 0.02595 and 0.9411 for butanol and butan-2-ol respectively. The isotherm models prove applicable for the quaternary adsorption system.

Abstract: This paper presents the design and construction of a simple Zeolite-water solar adsorption refrigeration system which has been fabricated and tested in the Department of Mechanical Engineering, Ahmadu Bello University, Zaria, Nigeria at a geographical location of latitude 11^o11’’NE. The theory on which this design is based is on the use of Zeolite-water adsorbent/ adsorbate pair to produce refrigeration. The energy source is a parabolic trough solar concentrator that collects and radiates solar thermal energy onto an air tight black coated absorber (generator) charged with Zeolite and water placed at the trough’s focal point. The absorber adsorbs and desorbs the adsorbate and produces refrigeration as vapor is released through a condenser and an evaporator. Constructional details of the system show the systems height at 1.2 m, parabolic trough dimensions of 0.6m by 0.45m, the cold chamber, has a capacity of 36 liters. The system was evaluated by leaving it outside under solar radiation and monitoring temperatures at various points inside the collector, the generator, and the evaporator through the use of thermocouple sensors. The highest and lowest temperatures of the absorber were 60.1°C and 25°C respectively. The lowest refrigeration temperature of 9.8°C was attained with 179J of cooling.