21 research outputs found
Application of Impedance Measurement Technology in Distinguishing Different Tea Samples with Ppy/SWCNT Composite Sensing Material
No full textChemInform Abstract: Synthesis, Optical Properties, and Sensing Applications of Gold Nanodots
No full text
Gold Nanomaterials Based Absorption and Fluorescence Detection of Mercury, Lead, and Copper
No full textApplication of Impedance Measurement Technology in Distinguishing Different Tea Samples with Ppy/SWCNT Composite Sensing Material
No full textSmart app-based on-field colorimetric quantification of mercury via analyte-induced enhancement of the photocatalytic activity of TiO2–Au nanospheres
No full textSynthesis of Graphene-ZnO-Au Nanocomposites for Efficient Photocatalytic Reduction of Nitrobenzene
No full textA simple
hydrothermal method of preparing highly photocatalytic
graphene-ZnO-Au nanocomposites (G-ZnO-Au NCs) has been developed.
Zinc acetate and graphene oxide are reduced by catechin to form graphene-zinc
oxide nanospheres (G-ZnO NSs; average diameter of (45.3 ± 3.7)
nm) in the presence of ethylenediamine (EDA) as a stabilizing agent
and gold nanorods (Au NRs) at 300 °C for 2 h. Then Au NRs are
deposited onto as-formed G-ZnO NSs to form G-ZnO-Au NCs. Upon ultraviolet
light activation, G-ZnO-Au NCs (4 mg mL–1) in methanol
generates electron–hole pairs. Methanol (hydroxyl group) assists
in trapping holes, enabling photogenerated electrons to catalyze reduction
of nitrobenzene (NB) to aniline with a yield of 97.8% during a reaction
course of 140 min. The efficiency of G-ZnO-Au NCs is 3.5- and 4.5-fold
higher than those provided by commercial TiO2 and ZnO NSs,
respectively. Surface assisted laser desorption/ionization mass spectrometry
has been for the first time applied to detect the intermediates (nitrosobenzene
and phenylhydroxylamine) and major product (aniline) of NB through
photoelectrocatalytic or photocatalytic reactions. The result reveals
that the reduction of NB to aniline is through nitrosobenzene to phenylhydroxylamine
in the photoelectrocatalytic reaction, while via nitrosobenzene directly
in the photocatalytic reaction. G-ZnO-Au NC photocatalyst holds great
potential in removal of organic pollutants like NB and in the production
of aniline
