Central Asian Journal of Theoretical and Applied Science

Thermodynamic and Kinetic Study of The Adsorption of Some Amines on The Surface of Bay Leaves

Munaf Khalaf Mahmood — Sun, 03 Aug 2025 00:00:00 +0000

This research conducted a thermodynamic and kinetic investigation of the adsorption of environmentally detrimental organic amino compounds, such as aniline and diphenylamine, from aqueous solutions onto bay leaves as an adsorbent. The study examined the influence of various factors on adsorption, including initial adsorbate concentration, pH, and temperature. Additionally, adsorption isotherms were determined. The findings revealed that the interaction between the amino compounds and the bay leaf surface was rapid, reaching equilibrium within 50-70 minutes. Furthermore, adsorption increased with an increase in adsorbent dosage. Temperature and pH impacted adsorption significantly; higher temperatures and acidic conditions (pH 7) favored increased adsorption. The adsorption isotherms indicated a non-spontaneous process. Correlation coefficient analysis revealed a strong resemblance between the experimental data and the Freundlich isotherm while deviating from the Langmuir isotherm. Regarding adsorption kinetics, the study concluded that the process followed a pseudo-second-order model.

Determining the Prevalence of Staphylococcus aureus Bacteria in Nasal Swabs from Restaurant Workers in Al- Kut City

Sun, 03 Aug 2025 16:16:19 +0000

Antibiotic resistance represents a global challenge to modern medicine, and among the most critical resistant pathogens is Staphylococcus aureus, particularly methicillin-resistant strains (MRSA). This study aimed to determine the prevalence of Staphylococcus aureus and the patterns of antibiotic resistance among nasal swab samples collected from restaurant workers in Al-Kut City. A total of 110 nasal swabs were obtained from food handlers and analyzed using standard microbiological techniques, including selective culturing on mannitol salt agar, coagulase testing, and Vitek2 identification. The D-test was used to assess inducible clindamycin resistance in MRSA isolates. Of the samples analyzed, 23 tested positive for Staphylococcus aureus, with 16 identified as MRSA and 9 as methicillin-sensitive S. aureus (MSSA). Antibiotic susceptibility tests revealed varying resistance rates among isolates, including 60.8% resistance to cefoxitin, 73.9% to oxacillin, 43.4% to vancomycin, 65.2% to erythromycin, 43.4% to clindamycin, 47.8% to ciprofloxacin, 17.4% to gentamicin, and 4.4% to chloramphenicol. These findings suggest a high prevalence of S. aureus carriage and antibiotic resistance among food handlers, underscoring the necessity of implementing regular screening and treatment programs in the food service industry to mitigate the risk of staphylococcal foodborne infections and protect public health.

Adsorption and Extortion, Their Role in Inhibiting Corrosion Rate, and Calculating Thermodynamic Functions

Mon, 04 Aug 2025 21:14:08 +0000

The adsorption of reactants by a catalyst (solid) in a heterogeneous catalyst flowing in a gaseous medium or in solutions was calculated. In thermodynamic functions, adsorption is accompanied by a decrease in the standard free energy of Gibbs because it is a spontaneous process. Therefore, it is accompanied by a decrease in entropy and enthalpy The free energy values at temperatures (293, 303, 313, 323) were (58.286, 53.746, 55.846, 57.066) respectively. The free energy, enthalpy and entropy were also calculated from the Capps relationship, using the equilibrium constants with temperature. The values of corrosion rate and surface coverage ratio (ᶿ) were calculated in (0.1M) sulfuric acid in the absence of inhibitors. The values of corrosion and ratio (ᶿ) at a temperature of (300 K) were (12.08, 966^5-10×) respectively,and Each metal has a certain number of active centers, which results in the amount( ᶿ), which represents the center covered by molecules through chemical adsorption. The gravimetric method is also used, where vacuum devices are used, including balances, and the measurement is carried out by weighing the adsorption surface (0.0000000001) g of the substance. A corrosion cell is also used to protect the metal, where anode-type electrodes are used, made of a metal more active than the metal to be protected. The corrosion cell consists of an anode, a cathode, an electrolyte, and a salt bridge.