Nitrobenzene

About: Nitrobenzene is a research topic. Over the lifetime, 5285 publications have been published within this topic receiving 83368 citations. The topic is also known as: essence of mirbane & nitrobenzol.

A nitrogen-rich fluorescent conjugated microporous polymer with triazine and triphenylamine units for high iodine capture and nitro aromatic compound detection

Abstract: A new kind of nitrogen-rich fluorescent conjugated microporous polymer TTPB was synthesized via a Friedel–Crafts reaction of 2,4,6-trichloro-1,3,5-triazine (TCT) and N,N,N′,N′-tetraphenylbenzidine (TPB) catalyzed by methanesulfonic acid. Having structural features of an expanded conjugated area, N-rich, twisted structure, and microporosity in polymer networks, TTPB showed excellent, efficient, reversible ultrahigh absorption performance for iodine vapour with an uptake of up to 4.43 g g−1, which is the highest value reported to date for CMPs. Furthermore, fluorescence study indicated that TTPB exhibits high sensitivity to electron-deficient nitrobenzene explosives via fluorescence quenching.

Drastic enhancement of TiO2-photocatalyzed reduction of nitrobenzene by loading Ag clusters.

Abstract: Ag clusters (mean diameter = 1.5 nm, standard deviation = 0.37 nm) were photodeposited on TiO2 particles in a highly dispersed state. The loading of a small amount of the Ag clusters (0.24 wt %) dramatically enhanced both the activity for the TiO2 photocatalytic reduction of nitrobenzene and the product selectivity of aniline. The essential action mechanism of the Ag clusters is discussed.

Catalytic effect of Fe2+, Cu2+ and UVA light on the electrochemical degradation of nitrobenzene using an oxygen-diffusion cathode

Abstract: The electrochemical treatment of 100 mg L−1 nitrobenzene solutions in 0.05 M Na2SO4 in the pH range 2.0–4.0 at 25 °C has been comparatively studied in the presence of Fe2+, Cu2+ and/or UVA light as catalysts using an undivided cell with a Pt anode and an O2-diffusion cathode able to electrogenerate H2O2. A quite slow degradation is found for the solution with 1 mM Cu2+ due to the low production of oxidizing hydroxyl radical (OH˙) from anodic oxidation of water and the action of the Cu2+/Cu+ system. Electro-Fenton treatment with 1 mM Fe2+ leads to a high concentration of OH˙ in the medium from Fenton's reaction, but less than 70% of the nitrobenzene is mineralized since stable complexes of Fe3+ with products are formed. These complexes are quickly photodecomposed in the photoelectro-Fenton treatment of the same solution under UVA irradiation, leading to overall depollution at low currents. Complete degradation is also feasible using 1 mM Cu2+ and 1 mM Fe2+ at high current because OH˙ can slowly destroy the complexes between Cu2+ and intermediates. The positive synergetic effect of all catalysts allows the quickest nitrobenzene mineralization using 1 mM Cu2+ and 1 mM Fe2+ under UVA irradiation. The nitrobenzene decay always follows a pseudo-first-order reaction. Aromatic products such as o-nitrophenol, m-nitrophenol, p-nitrophenol and 4-nitrocatechol have been followed by reverse-phase chromatography. Nitrate ions are formed from oxidation of nitroaromatic products. Generated carboxylic acids such as maleic, fumaric and oxalic have been detected by ion-exclusion chromatography. The different evolution of complexes of oxalic with Cu2+ and Fe3+ explains the influence of the catalysts on nitrobenzene degradation.