Application of Liquid-Liquid Microextraction-High-Performance Thin-Layer Chromatography for Preconcentration and Determination of Phenolic Compounds in Aqueous Samples

JPC – Journal of Planar Chromatography – Modern TLC - A novel liquid-phase microextraction method coupled with high-performance thin-layer chromatography (HPTLC) for preconcentration,...     

Photocatalytic and photoelectrocatalytic degradation of metoprolol tartrate in aqueous media by recyclable Co doping Fe<Subscript>3</Subscript>O<Subscript>4</Subscript>/TiO<Subscript>2</Subscript> magnetic core–shell nanocomposites

Magnetically recoverable cobalt doping Fe₃O₄/TiO₂ magnetic nanocomposites with an acceptable core–shell structure were prepared via a sol-gel process at low calcination temperature. The crystalline size and structure, morphology, and magnetic properties of resulting particles have been characterized by X-ray diffraction (XRD), fourier transform infrared (FT-IR), FT-Raman, high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and vibrating sample magnetometry (VSM). Metoprolol tartrate (MET) as a pharmaceutical pollutant was used to observe the photocatalytic degradation ability of the magnetically recoverable particles. The process of degradation under UV irradiation at controlled temperature was studied and the remaining concentrations of MET as a contaminant were measured by UV-Vis spectrometer at λ = 229 nm. This ability remained 95.76% after three times of repetitive use at the same conditions. Various parameters such as reaction temperature, pH, and speed of stirring of the aqueous solution had an effect on the rate of degradation. The amount of cobalt dopant and nanocomposites are also effective on the rate of degradation. Coupling of electrical current with photocatalytic process has proven to be effective in the degradation of MET aqueous solution clearly.     

Separation and Determination of Streptomycin by Ion Exchange-High-Performance Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC - A simple and highly sensitive method is developed for the determination of streptomycin in dosage forms and in biological fluids...     

Development of Thiol-Functionalized Mesoporous Silicate MCM-41 as a Modified Sorbent and Its Use in Chromatographic Separation of Metal Ions from Aqueous Nuclear Waste

Surface modified adsorbent mesoporous silicate MCM-41 has been prepared by grafting thiol containing functional group onto mesoporous silicate MCM-41. XRD, N₂ adsorption/desorption measurements, SEM, FT-IR, thermogravimetry and elemental analysis have been made to confirm the ordered mesoporous framework and the functionalization of the thiol groups. Sorption of 18 metal ions on this sorbent have been studied and discussed. Chromatographic separation of Rb(I)–U(VI)–Sr(II)–Zr(IV), has been achieved on column of this sorbent.     

Sorption of radionuclides on thorium tungstophosphate: A new inorganic ion-exchanger

Summary Samples of a new inorganic ion-exchanger thorium tungstophosphate have been prepared under various conditions. The ion exchange capacity, IR, XRD, thermogravimetry and sorption of the radionuclides have been studied. Separation of Sr-Nd, Sr-Ce, Cr-Mo and Cs-Nd have been developed on columns of this ion-exchanger.     

Sorption of radionuclides on cerium(IV) molybdophosphate ion exchanger

Samples of a new inorganic ion exchanger cerium(IV) molybdophosphate have been prepared under varying conditions. Ion exchange capacity, I.R, thermogravimetry and sorption of radionuclides have been studied. Separations of Sr−Rb and Cd−Ag have been developed on column of this ion exchanger.     

Synthesis and Characterization of Amino-functionalized Meso-porous Silicate MCM-41 for Removal of Toxic Metal Ions

Amino-functionalized MCM-41 has been prepared by grafting amino containing functional groups onto mesoporous silicate MCM-41 and characterized by powder X-ray diffraction, N2 adsorption/desorption measurement, SEM, FT-IR, thermogravimetry and elemental analysis to confirm the ordered mesoporous structure and the functionalization of the amino groups. Sorption behavior for 18 metal ions on this sorbent has been studied and discussed.     

Sorption studies of radionuclides on a modified mesoporous cerium(IV) silicate

Five different samples of a new sorbent, modified mesoporous cerium(IV) silicate have been prepared with various mole ratios of Si/Ce and Cetyltrimethylammonium bromide (CTMABr) as template. XRD, nitrogen sorption, SEM, IR, thermogravimetry and sorption of radionuclides have been studied. Separation of Hg(II)-Th(IV), Hg(II)-Zr(IV) and Rb(I)-Zr(IV) have been developed on columns of this novel sorbent.     

Chromatographic Behavior of Food Additives on Thin Layers of Titanium(IV) Silicate Ion-Exchanger

JPC – Journal of Planar Chromatography – Modern TLC - The chromatographic behavior of acetaldehyde, o-anisidine, ascorbic acid, benzoic acid, butylated hydroxyanisole, butylated...