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Aqueous solutions

Tìm thấy 20+ kết quả cho từ khóa "Aqueous solutions"

Colorimetric cadmium ion detection in aqueous solutions by newly synthesized Schiff bases

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We presented 2 new Schiff base derivatives, a benzaldehyde-based sensor (DMBA) and a cinnamaldehyde- based sensor (DMCA), for colorimetric sensing of Cd 2+ ions in aqueous solutions. The binding constant of the complexes was calculated as M − 2 for DMBA and M − 2 for DMCA.

Organic biomolecules bind to phosphate through borate linkages in aqueous solutions

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Although the products were obtained by flash precipitation from aqueous solutions, the chemical compositions and hydrate water contents were shown to be in good agreement with the experimental values.. Proposed formation of phosphateborate esters of salicylic acid.. linkages in the products, with n increasing with the employed phosphate ratio in the preparation step.

Preparation, characterization, and adsorption studies of core@shell SiO2@CeO2 nanoparticles: a new candidate to remove Hg(II) from aqueous solutions

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The removal of metal ions from aqueous solutions by adsorption is highly dependent on the pH of the solution, which affects the surface charge of the adsorbent and the degree of ionization and speciation of the adsorbate..

Plasma O2 modifies the structure of synthetic zeolite-A to improve the removal of cadmium ions from aqueous solutions

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Plasma O 2 modifies the structure of synthetic zeolite-A to improve the removal of cadmium ions from aqueous solutions. Abstract: The present study addresses the removal of cadmium ions (Cd(II)) from aqueous solutions at a pH of 7.5 using zeolite-A activated by exposure to oxygen plasma.

Adsorption of copper ions and alizarin red S from aqueous solutions onto a polymeric nanocomposite in single and binary systems

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The aim of the present work was to explore and extend the applications of chitosan/ZnO composite to remove ARS and copper ions from aqueous solutions in single and binary systems. In addition, the aim was to optimize the maximum adsorption efficiency of the synthesized nanocomposite. Kinetics, equilibrium, and thermodynamics of the adsorption for ARS and copper ions using chitosan and a chitosan/ZnO nanorod composite (CS-ZnO) were investigated.

Investigation of the removal of Ni(II) from aqueous solution using pomelo fruit peel

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However, the utilisation of pomelo fruit peel (Citrus grandis) as a biosorbent to remove Ni(II) from aqueous solutions has been limited. In previous reports, the pomelo fruit peel was used to adsorb methylene blue [16], Cr(III) [16], Pb(II) [17], and Cd(II) [17]. The obtained results indicated that the pomelo fruit peel is a potential biosorbent to uptake heavy toxic metals and organic molecules from aqueous solutions.

Chapter 10: Host-guest chemistry in aqueous organometallic catalysis

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One recent example is shown on Scheme 10.3 (although no catalytic application of complexes with this ligand have been disclosed yet), other modified cyclodextrins (126-128) are depicted in Chapter 2.. acids was studied in aqueous solutions with a catalyst in the presence of and permethylated [7].

Chapter 2: Ligands used for aqueous organometallic catalysis

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Quaternary ammonium salts of the sulfonated phosphines can be prepared by extracting aqueous solutions of the Na- or K-salts with a toluene solution of the appropriate salt [24]..

Chapter 9: Miscellaneous catalytic reactions in aqueous media

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During catalytic hydrogenations in homogeneous aqueous solutions or in aqueous-organic biphasic systems there is ample possibility for H/D exchange between hydrogen in the gas phase and the solvent (e.g. The reactions can be conveniently followed by or NMR in a high- pressure sapphire NMR tube. In fact, some of the reactions were surprisingly fast. For example, in the pH-range of 2.0-5.0, a was observed with as catalyst at 25 °C and 20 bar pressure.

Chapter 8: Catalytic oxidations in aqueous media - recent developments

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The reactions can be carried out in aqueous solutions or biphasic mixtures of the substrates with no additional solvent, in the presence of at 100 °C. At this pH the resting state of the catalyst is probably the dinuclear species depicted on Scheme 8.1, which falls apart upon coordination of the substrate alcohol. In this respect the catalyst system as very similar to that for the oxidation of terminal olefins [10,11]..

Reseach on the removal of hexavalent chromium from aqueous solution by iron nanoparticles

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As the results, the iron nanoparticles was used to remove Cr(VI) in aqueous solution with high efficency.. Mallouk Thomas, Remediation of Cr(VI) and Pb(II) Aqueous Solutions Using Supported, Nanoscale Zero-valent Iron, Environ. Mallouk Thomas, Surface Chemistry and Electrochemistry of Supported Zerovalent Iron Nanoparticles in the Remediation of Aqueous Metal Contaminants, Chem

Box–Behnken design for removal of uranium(VI) from aqueous solution using poly(ethylene glycol) based dicationic ionic liquid impregnated chitosan

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Selective adsorption of uranium (VI) from aqueous solutions using the ion-imprinted magnetic chitosan resins. 10.1016/j.jcis . doi: 10.1111/j tb01190.x. doi: 10.11159/awspt18.128

Graphene oxide–magnetite nanocomposite as an efficient and magnetically separable adsorbent for methylene blue removal from aqueous solution

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of GO along with the merit of easy separation due to the incorporation of magnetic NPs, could be a very efficient adsorbent for dye removal from aqueous solutions.

Tunable aryl alkyl pyrazolium tetrafluoroborate ionic liquids/salts: synthesis, characterization, and applications for removal of methyl orange from aqueous solution

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First, a series of solutions were prepared by keeping the total volume at 10 mL using equimolar aqueous solutions of the 4b salt and MO (0.27 mmol/L). The absorbance of the organic phase was measured at the maximum wavelength (418 nm) of the ion pairs formed between the 4b salt and MO.

Photocatalysis of formaldehyde in the aqueous phase over ZnO/diatomite nanocomposite

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of formaldehyde in aqueous solutions..

Schiff base immobilized silica gel framework as an efficient sorbent for preconcentration of Pb and Zn ions in aqueous media

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Flow control of the aqueous solutions through the Si-MSPA column was achieved with a Velp Scientifica SP311 peristaltic pump.. The solid support silica gel (70–230 mesh) was purchased from Merck.

Tổng hợp và ứng dụng hỗn hợp nano oxid mangan-sắt để hấp phụ As(V) từ dung dịch nước

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FROM AQUEOUS SOLUTIONS Synthesis of adsorbent and its adsorption. A simple method has been used to synthesize nanoparticles of mixed manganese-iron oxide for the adsorption of As(V) metal ions from aqueous solutions. The x-ray diffraction pattern indicated that the as-synthesized adsorbent is amorphous with 288.268 m 2 /g surface area.

Ultrasound-assisted surfactant/ionic liquid aqueous two-phase system extraction prior to high performance liquid chromatography for the determination of tetracyclines in milk and honey samples

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A Buchi rotary evaporator for synthesis of ionic liquids, Selecta 2001 pH meter for pH adjustment of aqueous solutions, Nuve ultrasonic bath and JP Selecta Ivymen system Cy-500 ultrasonic homogenizer system (500 W, 20 kHz) for sonication, and Spectrum 100 model Fourier transform infrared spectrometer with attenuated total reflectance (ATR) probe for characterization of ionic liquids were used.

Removal of Pb(II) and Cd(II) from aqueous solution using alkaline-modified pumice stone powder (PSP): Equilibrium, kinetic, and thermodynamic studies

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Pumice is one of the materials that can be employed in removing pollutants such as metals from water bodies or aqueous solutions. Pumice has a large proportion of silica sites, which gives it a negatively charged surface, and it has a large number of open sites, which allow water and ions to move in and out of the crystal structure.

Preparation of feed grade monocalcium phosphate by crystallization in aqueous medium: Calculation and experiments

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Other routes use aqueous solutions containing organic solvents such as acetone-water, ethanol- water or methanol-water, to precipitate monocalcium phosphate even at ambient temperatures [5, 6, 7]. However, the possibility that the end products contain some solvents or impurities, may raise concerns about the use of monocalcium phosphate in feed-grade additives. Hence, the use of aqueous mother liquor as a medium for the precipitation and crystallization of monocalcium phosphate may be fruitful.