ISSN: 1813-0410

Keywords : adsorption


Fabrication and Characterization Membrane Prepared from Oxidized Multiwall Carbon Nanotube/Nylon 6 Composite

Akram R. Jabur; Laith K. Abbas; Saja A. Moosa

journal of kerbala university, 2015, Volume 11, Issue 3, Pages 200-212

Mixed matrix nanofibres membranes were prepared, characterized, studied and evaluated for performance and properties in this research. Acid oxidized Multiwall carbon nanotubes MWCNTs embedded in Nylon 6 as matrix polymer were the materials used to create the prepared membranes. Through; the electrospinning process, the hydrophilicity of the membrane was enhanced by blending (MWCNTs) due to migration of functionalized MWCNTs into the membrane surface. Scanning electron microscopy SEM and morphology studies showed that average fiber diameters produced were about 72-193 nm and average pore size 183 - 226 nm . It was found that as fiber diameter decreases high porosity and small pore size will be created and increasing the amount of functionalized MWCNTs leads to increase of pure water flux. The MWCNT blended with Nylon 6 membranes showed better antibactericidal ability as compared to the neat Nylon 6 membranes. Water filter media with a high rejection ratio against heavy metal ions reached (80%) at (0.8 wt. % MWCNT) membrane. Addition of MWCNTs forms a membrane with high mechanical strength (4.158MPa) of Nylon/ 0.8 wt. % MWCNT.

Kinetic and thermodynamic studies for the adsorption of Nickel (II) by Basil seeds in aqueous solutions

Elham M . AL-Rufaie; Beidaa A.kadhim

journal of kerbala university, 2015, Volume 11, Issue 1, Pages 135-145

Environmental pollution as a result of a heavy metal presence led to serious health problems. Inthis study, the adsorption by swollen Basil seeds were determined. The adsorption behavior of Basil seeds with respect to Nickel (II) has been studies by batch method to consider its application in this field.The effects of various experimental parameters like contact time, dosage of Basil seeds, initial concentration of the metal ion, pH of solution, and temperature have been investigated .The removal percentage is a pH dependent and decrease with increase in temperature, The best removal were at 200C. The equilibrium adsorption experimental data were found to fit Freundlich isotherms for Nickel (II). The pseudo-first and second order kinetic model both fitted the kinetic.The thermodynamic parameters, (∆0G) was found to be positive and become negative at low temperature (below 100C), ∆0H is negative that means exothermic adsorption process and ∆0S is negative also which indicate the increase in the order at the solid-solution interface.

Theoretical study on the effect of operating parameters on the performance of adsorption refrigerator

Abdul Hadi N. Khalfa; Ahmed Q. Mohammed; Hassan Jawdat Fadiel

journal of kerbala university, 2014, Volume 10, Issue 4, Pages 161-174

This work include a theoretical analysis of an adsorption refrigerator, the adsorption refrigerator consist of unit generator in the form of shell and tube heat exchanger, the generator can be heated either by hot water from solar collector, or from waste heat. The adsprtion pair used was active carbon-methanol. A complete thermodynamics analysis was achieved on the unit, while the thermo physical properties of methanol were calculated using Dubinin and Astakhov equation. Many key parameters were examined to find the effect off the unit starting, evaporator, condensing and peak temperatures on the cycle COP. The results show that for a certain ambient temperature there is an optimum generator temperature at which COP reaches a maximum. as the ambient temperature increases the condensing temperature increases also, thus leads to reduce cycle COP, and finally heavy materials used in building the adsorption cycle leads to increase the consumed heat that used to heat up the generator.

Removal of Azo Benzidine Reactive Dye From Aqueous Solution By Adsorption onto ZnO Surface

Wafaa Naser Mohammed Saeed

journal of kerbala university, 2013, Volume 9, Issue 4, Pages 11-18

In this study, the adsorption of azo benzidine reactive dye was carried out by using ZnO surface. Various parameters such as pH, adsorbent weight, initial dye concentration and contact time were studied in terms of their effect on the adsorption process. Furthermore, Lagergren’s equation was used to determine adsorption kinetics. It is observed that high removal of dye was obtained at pH=5. Removal of dye was increased by increasing initial dye concentration and contact time. High removal of dye was at the time equivalent of 90 min and reached equilibrium. Increasing of adsorbent weight leads to decrease dye adsorption where 0.1gm was the best weight. For kinetics the reaction onto ZnO followed pseudo-second order Lagergren’s equation.

Removal of Azo Dye Reactive Black 5 By Adsorption onto ZnO and CaO

Wafaa Naser Mohammed Saeed

journal of kerbala university, 2013, Volume 9, Issue 2, Pages 321-330

In this study, the adsorption of reactive black 5 dye was carried out by
using various surfaces, namely ZnO and CaO. The validity of the adsorption was evaluated by using UV Spectrophotometry through the determination the amount of adsorbed dye. Various parameters such as pH, adsorbent weight, initial dye concentration and contact time were studied in terms of their effect on the reaction progress. Furthermore, Lagergren’s equation was used to determine adsorption kinetics. It is observed that high removal of dye was obtained at pH=5. Removal of dye was increased by increasing initial dye concentration and contact time. High removal of dye was at the time equivalent of 70 min and reached equilibrium. Increasing of adsorbent weight leads to decrease dye adsorption where 0.1gm was the best weight. For kinetics the reaction onto CaO followed pseudo-first order Lagergren’s equation while the reaction onto ZnO followed pseudo-second order Lagergren’s equation and the adsorbed amount onto CaO surface was more than that of ZnO surface.

Adsorption of Methylene Blue Dye from Wastewater By Spent Tea Leaves

Ihsan Habib Dakhil

journal of kerbala university, 2013, Volume 9, Issue 1, Pages 5-14

The aim of present work was to investigate the ability adsorption of methylene blue (MB) dye from wastewater using low-cost adsorbent, spent tea leaves (STL), in batch isotherm adsorption technique. The adsorption experiments were carried out under different conditions of initial dye concentration (50-500) mg/l, STL dose (0.05-1) g, pH solution (2-11), and contact time (10-180) min under constant temperature of 30 oC. The results were indicated that the optimum conditions were adsorbent dose was 0.43 g per 100 ml dye solution, pH=7. The equilibrium isotherms have been analyzed using the Langmuir and Freundlich models. The experimental results were best described by the Freundlich isotherm model with maximum monolayer adsorption capacities found to be 62.2 mg/g with the high value of correlation coefficient. The results suggested that STL has high potential 98% to be used as effective adsorbent for MB dye removal.

Corrosion Inhibitors Effects and adsorption properties of Theobromine for the Corrosion of Iron in Hydrochloric Acid Medium

May Essa Mahmood

journal of kerbala university, 2012, Volume 8, Issue 1, Pages 152-162

Inhibition of corrosion of iron in hydrochloric acid solutions by theobromine as natural product has been studied using thermometric and galvanometric measurements indicate that the average inhibition efficiency of theobromine at 303ºc ranged from 62.9% to 83.8% and 84.1% to 93.4% respectively. It has been found that theobromine acts as a good corrosion inhibitor for iron in all concentrations of HCl solution. Inhibition was found to increase with increasing concentration of inhibitor. The effects of temperature, immersion time and acid concentration on the corrosion behavior of iron were also studied. The adsorption of theobromine on iron surface obeyed the Langmuir adsorption isotherm. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated.