Topic
Buffer solution
About: Buffer solution is a research topic. Over the lifetime, 6948 publications have been published within this topic receiving 112440 citations. The topic is also known as: pH buffer & buffer.
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TL;DR: In this article, a method for synthesis of Pt-doped TiO2 nanoparticles (Pt-TiO2) by sol-gel assisted method was reported, which was characterized using X-ray diffraction (XRD), transmission electronic microscopy (TEM) and FT-IR techniques.
Abstract: a b s t r a c t In this research, we reported a novel method for synthesis of Pt doped TiO2 nanoparticles (Pt-TiO2) by sol-gel assisted method. The synthesized Pt doped TiO2 nanoparticles were characterized using X- ray diffraction (XRD), transmission electronic microscopy (TEM) and FT-IR techniques. To investigate the catalytic efficiency of Pt-TiO2 nanoparticles, the electrooxidation of l-methionine (l-Met) using the deposited film of Pt doped TiO2 nanoparticles and carbon nanotubes composite on glassy carbon electrode (Pt-TiO2/CNT/GCE) was studied in buffer solution (pH 7.00) using cyclic voltammetry (CV). Bare GCE shows an ill-defined oxidation wave around 1.4 V for l-Met whereas Pt-TiO2/CNT/GCE shows a well- defined oxidation peak at 1.1 V. The modified electrode does not show any fouling effect toward the oxidation of l-Met. Amperometry method was used to determine l-Met in the concentration range of 0.5-100 M with a detection limit of 0.1 M (S/N = 3). The selectivity of the reaction has been assessed with no interference from tyrosine, lysine, cysteine, tryptophan, alanine and glutathione. The present modified electrode shows good recovery results for spiked l-Met in human blood serum sample. © 2012 Published by Elsevier B.V.
63 citations
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TL;DR: In this article, the adsorption of Cd2+ onto amorphous hydrous manganese dioxide (δ-MnO2) has been studied in (a) 0.5 M NaCl solution and (b) major ion seawater.
63 citations
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TL;DR: Values of ions extraction and elements recoveries resulted fairly equivalent with those obtained by the reference methods, and performance times of the procedure were optimised to meet the target of routine application for large scale monitoring samples.
63 citations
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TL;DR: A simple method for synthesis of gold nanoparticles (AuNPs) using Aspergillum sp. WL-Au was presented in this article, where the shape and size of AuNPs were affected by different parameters, including buffer solution, pH, biomass and HAuCl 4 concentrations.
Abstract: A simple method for synthesis of gold nanoparticles (AuNPs) using Aspergillum sp. WL-Au was presented in this study. According to UV–vis spectra and transmission electron microscopy images, the shape and size of AuNPs were affected by different parameters, including buffer solution, pH, biomass and HAuCl 4 concentrations. Phosphate sodium buffer was more suitable for extracellular synthesis of AuNPs, and the optimal conditions for AuNPs synthesis were pH 7.0, biomass 100 mg/mL and HAuCl 4 3 mM, leading to the production of spherical and pseudo-spherical nanoparticles. The biosynthesized AuNPs possessed excellent catalytic activities for the reduction of 2-nitrophenol, 3-nitrophenol, 4-nitrophenol, o -nitroaniline and m -nitroaniline in the presence of NaBH 4 , and the catalytic rate constants were calculated to be 6.3×10 −3 s −1 , 5.5×10 −3 s −1 , 10.6×10 −3 s −1 , 8.4×10 −3 s −1 and 13.8×10 −3 s −1 , respectively. The AuNPs were also able to catalyze the decolorization of various azo dyes (e.g. Cationic Red X-GRL, Acid Orange II and Acid scarlet GR) using NaBH 4 as the reductant, and the decolorization rates reached 91.0–96.4% within 7 min. The present study should provide a potential candidate for green synthesis of AuNPs, which could serve as efficient catalysts for aromatic pollutants degradation.
63 citations
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TL;DR: In this article, a modified Meldola's Blue electrode was used for cyclic voltammetry and amperometry and was found to have a linear response range of 1.0 10−5 −5.
63 citations