تشکیل کمپلکس بین یون Pd+2 و داکسی سایکیلین در DMF با استفاده از روش طیف سنجی مرئی-فرابنفش در دماهای [(15، 25، 35 و 45 ± 0.1) ° C مورد مطالعه قرار گرفت. روند تشکیل کمپلکس از لحاظ pH، دما و زمان بهینه سازی شد. نسبت استوکیومتری (یون فلز / لیگاند) 1: 1 به دست آمد. ثابت تشکیل کمپلکس و پارامترهای ترمودینامیکی به وسیله اطلاعات مربوط به روش نسبت مولی با کمک برنامه KINFIT بدست آورده شده است. همچنین از تشکیل کمپلکس برای تعیین مقدار دارو و تعیین پارامترهای نوری استفاده شد. تشکیل کمپلکس بین یون Pd+2 و داکسی سایکیلین در DMF با استفاده از روش طیف سنجی مرئی-فرابنفش در دماهای [(15، 25، 35 و 45 ± 0.1) ° C مورد مطالعه قرار گرفت. روند تشکیل کمپلکس از لحاظ pH، دما و زمان بهینه سازی شد. نسبت استوکیومتری (یون فلز / لیگاند) 1: 1 به دست آمد. ثابت تشکیل کمپلکس و پارامترهای ترمودینامیکی به وسیله اطلاعات مربوط به روش نسبت مولی با کمک برنامه KINFIT بدست آورده شده است. همچنین از تشکیل کمپلکس برای تعیین مقدار دارو و تعیین پارامترهای نوری استفاده شد. تفاصيل المقالة

Nickel oxide (NiO) nano-size powder is synthesized using nickel (II) acetate tetrahydrate, sodium lauryl sulfate (SLS) and ammonia as precursors. Applied surfactant is anionic surfactant. The sample was characterized by FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM). The results obtained confirm the presence of nickel oxide nano-powders produced during chemical precipitation. Evaluation of the catalytic activity of developed nano-NiO particles were carried out using ultraviolet visible spectra. The uv-vis spectra obtained after ultraviolet irradiation in the presence of nickel oxide can indicate the degradation of tetracycline (TC) and dye Acid red -18 (ponceau 4R). The prepared NiO exhibits that 75% of Acid red -18 has been eliminated after 10 min.The results indicate that optimum concentration of NiO catalyst and the best pH for the degradation of AR were 0.5 g L-1 and pH 7, respectively. The best TC degradation results were obtained with 2 g L−1of the photocatalyst at pH 11. تفاصيل المقالة

ZnO nanoparticles have been prepared by a simple method in a short period of time. In this synthetic method, the sample was obtained using Zn(CH3COO)2·2H2O and a new template of hexamine salt. Their crystalline structure and morphology were studied by XRD and SEM. The optical properties of the sample were studied by UV–visible spectroscopy. The absorption spectrum of ZnO shows that the optical band gap is 3.02 eV. In this investigation, the photocatalytic degradation of Indigo carmine(IC) in water was studied. The degradation rate is reduced as a function of increase in the initial concentration of IC. The effects of some parameters such as pH and initial concentration of dye were examined. تفاصيل المقالة

Fruits, vegetables, oils, coffee, nuts, and tea contain coumarin. The scientific attraction of coumarins is attributed to their pharmacological activity. In this study, density functional theory (DFT) calculations were performed in the B3LYP/6-31G(d) level of theory to evaluate the potentialities of single-walled carbon nanotubes (SWCNT) as a carrier for 3-acetyl-6-methyl-4-hydroxy-coumarin. The natural bond orbital (NBO) analysis suggested that the functionalized nanotube plays the role of an electron donor and 3-acetyl-6-methyl -4-hydroxy- coumarin molecule acts as an electron acceptor at the SWCNT -coumarin complex. Variations of density and dipole moment values of coumarin after interaction were studied. Also, the frontier orbital energies, HOMO-LUMO gap, chemical hardness (η), electrophilicity index (ω), charge transferred (ΔNmax) and chemical potential (μ) were computed. Pure coumarin is less conductive and smoother than SWCNT -coumarin. Our results show efficient coumarin loading with the interaction energy of -1.19 eV. NBO analysis shows that the occupied orbitals in the coumarin and the unoccupied orbitals in the nanotube overlap. تفاصيل المقالة

Tetragonal zirconia (t-ZrO2) nanoparticles were synthesized from the
zirconium chloride using the co-precipitation technique and characterized by various
measurement techniques. FESEM analysis further revealed spherical shaped NPs and
HR-TEM analysis determined the size of the particles in the range of 14.5 nm. The band
gap energy was estimated 4.0 eV. The UV (350 nm) emission was observed from PL
spectrum. The photocatalytic degradation of the as-prepared ZrO2 nanoparticles were
studied under UV light irradiation using ciprofloxacin (CIP) as a model organic
pollutant. Results showed that 50% degradation were achieved within 15 min. تفاصيل المقالة