بحوث سكوبس — هدير جاسم

Using appropriate organotin chloride salts and a ligand called 2-[(2,3-dimethylphenyl) amino] benzoic acid (DMPAB), a condensation procedure produced novel complexes such as triphenyltin, dimethyl, diphenyl, and dibutyl-tin. For difficult identification, a variety of analytical methods were used, including elemental analysis, carbon and proton magnetic resonance, and infrared spectra. The agar ditch method was used to assess the antibacterial effectiveness against Staphylococcus aureus and Escherichia coli. When compared to the molecule generated from the ligand, the complexes showed more inhibitory action. Among the complexes tested, the dimethyltin carboxylate complex showed the strongest antibacterial action against Staphylococcus aureus and Escherichia coli. © 2024 Chemical Society of Ethiopia. All rights reserved.

Nano-bots or Nano-robots are nanoscale devices that may enter the body's cells and execute a specific purpose. They can be manmade or organic. Nanotechnology is presently used in a variety of medical applications, such as medication delivery systems, as well as in a variety of other items, such as sunscreens, meals, and cosmetics. Nano-robot research is critical because, if successful, it could revolutionize the treatment of chronic diseases like cancer, or it could be used to treat damaged organs without surgery. The equivalent of ten atoms in size. Despite the encouraging outcomes of Nano-robots, scientists have a significant challenge in producing such small devices. © 2023 American Institute of Physics Inc.. All rights reserved.

In this work, 2-(benzylidene amino) acetic acid was prepared by reflexing reaction of benzaldehyde with glycine, then this prepared and characterized compound was used as ligand to prepare tri and diorganotin complexes by condensation reaction with the corresponding organotin chloride salts. The complexes were identified by different techniques, such as infrared spectra, (tin and proton) magnetic resonance and elemental analyses. The antioxidant activity of 2-(benzylidene amino) acetic acid and prepared complexes were studied by two different methods; Free radical scavenging activity (DPPH) and CUPRRAC methods. Tri and di-tin complexes gave high percentage inhibition than ligand with both methods due to tin moiety, also Triphenyltin carboxylate complex was the best compared with the others. © 2023, Azerbaijan National Academy of Sciences. All rights reserved.

Nanotechnology and metal-doping are two promising techniques to make semiconductive material-based photocatalysts with higher surface area and modulating electronic structure. Using the simple surfactant-assisted co-precipitation approach; we synthesized nanostructured Zn-doped CuO (Zn0.4Co 0.6 O) as a visible-light-driven catalyst for environmental remediation. The morphology, texture, crystal structure, phase, charge transport properties, and chemical constitution of the as-prepared materials were characterized through advanced physiochemical characterization. Using the Rhodamine B (RhB) dye and the bacteria Escherichia coli (E-coli), the photocatalytic and antibacterial activities of CuO and Zn-doped CuO were investigated and compared to evaluate the effect of the doping technique. Surfactant-assisted synthesized Zn-doped CuO samples demonstrated excellent photocatalytic practicability against Rhodamine B dye, with a mineralization efficiency of up to 92.89% within 70 min and a high pseudo-first-order kinetic constant (K) of 0.033 min-1. The photocurrent response of the Zn-doped CuO sample was about double that of the CuO sample, demonstrating that the nanoarchitecture and modified electronic structure of the Zn-doped CuO sample resulted in increased photocatalytic activity. Furthermore, the Zn-doped CuO photocatalyst demonstrated enhanced antibacterial activity, killing E. coli bacteria by creating reactive oxygen species (ROS) that disrupt their important cellular processes and functions. Thus, our proposed Zn-doped CuO photocatalytic with faster degradation kinetics, good recyclability, and a lower electron-hole recombination probability could be used for environmental remediation. © 2022 Elsevier B.V.

Doxycycline and Naproxen are among the most widely used drugs in the therapy of CoVID 19 disease found in surface water. Water scarcity in recent years has led to research to treat polluted water. One of the easy and low-cost methods for treatment is adsorption. The utilize of Metal-Organic Frameworks (MOFs) to evacuate pharmaceutical contaminants from water sources has been considered by researchers in the last decade. In this research, HKUST-1/ZnO/SA composite with high adsorption capacity, chemical and water stability, recovery, and reuse properties has been synthesized and investigated. By adding 10 wt% of ZnO and 50 wt% of sodium alginate to HKUST-1, at 25 °C and pH = 7, the specific surface area is reduced by 60%. The parameters of drugs concentration C0 =(5,80) mg/L, time=(15,240) min, and pH= (2,12) were investigated, and the results showed that the HKUST-1/ZnO/SA is stable in water for 14 days and it can be used in 10 cycles with 80% removal efficiency. The maximum Adsorption loading of doxycycline and Naproxen upon HKUST-1/ZnO/SA is 97.58 and 80.04 mg/g, respectively. Based on the correlation coefficient (R2), the pseudo-second-order and the Langmuir isotherm models were selected for drug adsorption. The proposed mechanism of drug uptake is by MOFs, hydrogen bonding, electrostatic bonding, and acid-base interaction. © 2022 Elsevier B.V.

Adsorption plays an effective role in pollution control, water treatment, and reuse. In this study, the removal of Streptomycin drug from aqueous solution was adopted by preparing a hydrogel surface for drug absorbent. The poly (PVA-AAM) hydrogel surface was prepared by relying on the polymerization of free radicals, using KPS as a starting material for free radicals, and using the cross-linking agent (AMB). The surface was studied and characterized by using several techniques such as (FTIR, TEM, AFM, and BET). Several important factors were studied, including (the effect of equilibrium time, the ionic strength, and the effect of temperature). The adsorption efficiency decrease when the concentration of salt increase, and the best weight (0.05 g) give higher adsorption capacity and best pH in the acidic medium. The study showed that adsorption efficiency increases with decreasing temperature through the adsorption process at different temperatures. The change in the values ​of thermodynamic functions (Entropy, Enthalpy, and Gibbs free energy) was calculated and found the reaction spontaneous and exothermic process. The adsorption isotherms were studied through the results, and it was found that it obeys the Freindlich model. © 2022, Dr. Yashwant Research Labs Pvt. Ltd.. All rights reserved.

Density functional theory was used to investigate the possible use of the B36 borophene in the detection of H2S, CS2, COS, and SO2 gases. In general, the order of interaction stability for the studied gases is as follows: SO2 > CS2 >H2S > COS. There seems to be a relation between the energy of absorption and the electric dipole moment of the molecules. The B36 borophene is indeed a Ф-type sensor that only detects SO2 and also an electronic sensor that detects SO2 and CS2. As a Ф-type sensor, it can be extrapolated that the B36 borophene is able to identify SO2 in the presence of H2S, COS, and CS2. Furthermore, it may work selectively between SO2 and CS2 as an electronic sensor by changing different electronic conductivity values in the presence of the as-mentioned gases. It is an electronic or function-type sensor for the detection of COS and SO2. The B36 borophene has a short recovery time of around 0.7 s and 0.1 s for the desorption of CS2 and SO2 from the surface at ambient temperature. It has been determined that this borophene is able to function in a moist environment. © 2022 Elsevier B.V.

The present study aimed to remove crystal violet (CV), malachite green (MG), Cd(II), and Pb(II) from an aqueous solution using clinoptilolite zeolite (CZ) as an adsorbent. Response surface methodology (RSM) based on central composite design (CCD) was used to analyze and optimize the process parameters, such as pH, analyte concentration, adsorbent amount, and sonication time. Quadratic models with the coefficient of determination (R2) of 0.99 (p < 0.0001) were compared statistically. The results revealed that the selected models have good precision and a good agreement between the predicted and experimental data. The maximum removal of contaminants was achieved under optimum conditions of pH = 6, sonication time of 22 min, the adsorbent amount of 0.19 g, and analyte concentration of 10 mg L−1. The reusability test of the adsorbent showed that the CZ adsorbent could be used 5 times in water and wastewater treatment processes. According to the results of interference studies, the presence of different ions, even at high concentrations, does not interfere with the removal of contaminants. Applying the CZ adsorbent on environmental water samples revealed that CZ adsorbent could remove CV, MG, Cd(II), and Pb(II) in the range of 84.54% to 99.38% and contaminants present in industrial effluents. As a result, the optimized method in this study can be widely used with high efficiency for removing CV, MG, Cd(II), and Pb(II) from water and wastewater samples. © 2022, The Author(s).

In this study, four types of textile dyes (Congo red CR, Maxellon blue GRL, crystal violet CV, Brilliant blue BB) were adsorbed from their aqueous solution using cotton as a highly efficient adsorbent surface. The method relied on using a syringe as a separating column, and the syringe was filled with cotton within a certain weight. The most crucial factors affecting the separation process were studied, including the effect of weight, and the effect of concentration of dyes. The surface (reusability) reuse was also studied several times in the separation process. It was found that the cotton keeps its efficiency after three cycles, but after the fourth cycle, it loses its efficiency as an effective adsorbent surface. The two types of adsorption isotherms were applied through the results that the Freundlich adsorption isotherm depending on the value of (Congo red CR, Maxellon blue GRL, crystal violet CV, Brilliant blue BB) dyes (R2= 0.9788, 0.9591, 0.9423, 0.9122) compared to the Langmuir isotherm. © 2022, Dr. Yashwant Research Labs Pvt. Ltd.. All rights reserved.

In today's heating and cooling industry, all investigators assume environmentally friendly and economic procedures because of environmental and energy crisis issues. Boiling heat transfer (BHT) is one of the impressive heat transfer (HT) procedures known in various engineering applications. The thermal conductivity of nanoparticles (NPs) is several times that of the base fluid. One way to amend a fluid's thermophysical attributes is to utilize nanofluids (NFs) as boiling fluid. In this research, Fe NPs have been used in the water-based fluid. Fe NPs to the base fluid for reasons like enhancement of the HT surface, enhancement of the heat capacity of the fluid, enhancement of the effective thermal conductivity, and monotony of the temperature gradient in the fluid cause a substantial enhancement in HT coefficient. So far, the effect of phase change time and the effects of pyramidal surface height on the Fe/water NF have been rarely done numerically using molecular dynamics simulation (MDS). The main purpose of the current modeling is to improve the atomic behavior and pool boiling heat transfer (PBHT) of water/Fe NF. This paper investigates the effect of atomic layers and atomic pyramidal surface roughness (SR) with different heights on atomic behavior and PBHT by the MDS. The outcomes display that increasing the number of layers increases the maximum density value from 0.029 to 0.033 atom/Å3 and reduces the maximum temperature from 789 K to 653 K. The increase in the number of atomic layers in the microchannel (MC) wall corresponds to the decrease in heat flux (HF) in the MC. With addition of pyramidal SR, the HF in the MC increases. © 2022 Elsevier B.V.

In this paper, new epichlorohydrin crosslinked 2,4-dihydroxybenzaldehyde Schiff base chitosan@SrFe12O19 magnetic nanocomposite (EP-DBSB-CS@SrFe12O19) was prepared from the reaction of epichlorohydrin, 2,4-dihydroxybenzaldehyde and chitosan (1:1:1 weight ratio) at the presence of SrFe12O19 nanoparticles. The title compound EP-DBSB-CS@SrFe12O19 was characterized by FT-IR, XRD, DSC, VSM, FE-SEM, EDS and map analysis and the results of all of them confirm that the successfully preparation of hard magnetic nanocomposite of EP-DBSB-CS@SrFe12O19 with uniform distribution of all elements. In addition, the removal of Pb(II) and Cd(II) ions from aqueous solution using EP-DBSB-CS@SrFe12O19 nanocomposite has been characterized and the effect of pH solution, shaking time and also sorbent dose on removal percentage were investigated. Adsorption results predicts that the maximum removal percentage, 98.5% for Pb(II) and 86% for Cd(II), was found to be at pH solution of 5 at the presence of 0.02 g sorbent and 90 min contact time. According to these results, we proposed adsorption process using magnetic EP-DBSB-CS@SrFe12O19 nanocomposite to removal of other heavy metal such as Hg(II), Cu(II), Co(II), Cr(VI) and Ni(II). © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

B3LYP, M06-2X, and B97D density functionals are utilized for probing the effect of decorating Cu, Ag, and Au on the sensing performance of an aluminum phosphide nanosheet (AlPNS) in detecting the propylthiouracil (PTU) drug. We predict that the interaction of pure AlPNS with PTU is physisorption, and the sensing response (SR) of AlPNS is approximately 3.1. The adsorption energy of PTU changes from −5.1 to −18.7, −18.9, and −19.3 kcal/mol by decorating the Cu, Ag, and Au metals into the AlPNS, respectively. Also, the corresponding sensing response (SR) meaningfully rises to 53.4, 65.1, and 84.2. It indicates that by increasing the atomic number of metals, the sensitivity of metal decorated AlPNS (metal@AlPNS) is increased. Therefore, we found that Au-decorating much more increases the sensitivity of AlPNS toward PTU drug. The SR of metal@AlPNS slightly decreases in the water solvent. © 2022 Elsevier B.V.

Editors have retracted this Article. After publication, concerns were raised about authorship and description of author contributions. The Editors requested the authors to provide raw original data and explanations regarding the contributions, but found the response provided by the Authors insufficient. The Authors were also not able to provide the data in the format that would allow for the confirmation of its veracity (i.e. including sufficiently detailed meta-data). The Editors therefore no longer have confidence in the reliability of the data presented in this Article.None of the Authors responded to the correspondence from the Editors about the retraction. © The Publisher 2022.

Adsorption experiments were carried out at temperature (25°C) to remove the methyl violet (MV) dye using the hydrogel as an inexpensive, more effective surface. We studied two kinds of adsorption isotherms i.e., Freundlich and Langmuir models depending upon the linear and non-linear methods. The results depending on the non-linear is the best way to obtain isothermal parameters compared to the linear method. Comparing the Freundlich model with the model Langmuir in the linear and non-linear method, the Freundlich model is the best. Where the value of the linear method (R2 = 0.8796) or the non-linear method (R2=0.9887). © 2022, Dr. Yashwant Research Labs Pvt. Ltd.. All rights reserved.