Synthesis of 2,4-dinitrophenol (PDF Download Available)

Synthesis of 2-methyl-4-nitrophenol from benzene


In the present work, we report the synthesis and characterization of spherical mesoporous FeNbTiO (=0.01) (FNT1) with a surface area of up to 145mg prepared from a titanium/niobium tartrate with triethanol amine and ferric nitrate precursor by sol–gel method. Here, the role of Fe(III) in Fe–Nb–TiO composite is to compensate the charge imbalance caused by the replacement of Ti(IV) with Nb(V) in TiO crystals, which result in improving charge separation among the photo-produced hole–electron pairs. However, interestingly our study show that Fe and Nb doped TiO display good mesoporous nature and brings the photocatalytic reduction of 4-NP to 4-Amp in aqueous medium, containing NaBH and in the presence of UV light. The mesoporous FNT1 photocatalysts has good reduction catalytic activity compared to other prepared composites of FeNbTiO and pure TiO. FNT1 spheres have diameters of about 8–10nm and mesopores sizes are of about 4–5nm. The nano-sized photocatalysts were characterized by thermal analysis, X-ray diffraction, UV–visible spectroscopy, BET surface area, UV–visible diffuse reflectance spectra, EPR spectra and transmission electron microscopy (TEM) analyses.

10/05/2012 · New highly selective method is suggested for synthesis of 2,4-dinitrophenol by nitration of phenol with nitric acid …

Sulfonic acid, Phenol and Phenol derivatives …

some end products derived from mononitrophenols include dyes and pigments, acetaminophen (from p-aminophenol), carbofuran, phosalon (insecticides form o-nitrophenol), parathion,parathion-methyl, fluorodifen (insecticides form p-nitrophenol), nitrofen, bifenox (herbicides form p-nitrophenol), fungicides, and rubber chemicals.

Synthesis of spherical mesoporous titania modified iron-niobate nanoclusters for photocatalytic reduction of 4-nitrophenol Journ

In summary, we have developed a conceptually different method to incorporate nanocluster mixtures {Fe(III) and Nb(V) species} onto TiO lattice and initially found that both the efficient photocatalytic reduction of 4-nitrophenol under UV light can be achieved in our materials. Moreover, the detailed structure for our nanoclusters was comprehensively characterized by TEM analysis, and the possible mechanism of the reduction properties could be explained. The balance between Fe(III) and Nb(V) with Ti(IV) states in FeNbTiO is critical to achieve efficient p-nitrophenol reduction. This is probably due to efficient generation of electron and hole under UV light through mutual charge transfer from Fe(III) and Nb(V) ion in the clusters. As a result Fe(III) transform to Fe(II) and Nb(V) convert to Nb(IV), where electron resides in the conduction band and a hole is captured forming Fe/Nb. Therefore, this Fe/Nb reduce quickly p-nitrophenol to p-aminophenol. Furthermore, mesoporous FNT1 has continued to be highly active in photocatalytic applications because it is beneficial for promoting the diffusion of reactants and products, as well as for enhancing the photocatalytic activity by facilitating access to the reactive sites on the surface of photocatalyst.

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Large-Scale Synthesis of TiO2 Nanorods via …

Spherical mesoporous titania modified iron-niobate nanoclusters FNT1 [FeNbTiO (=0.01)], with relatively small particle size 10±2nm and 145mg were prepared using a sol–gel method, from the reaction of titanium and niobium tartrate with triethanol amine and ferric nitrate solution. HRTEM of FNT1 shows coexistence of porous mesostructure and high symmetric order of crystallinity in the nanoparticles. The mesopore size is in the range of 4–5nm and the lattice fringes of 0.37nm is observed in the mesopore walls which correspond to the d-spacing between adjacent (101) crystallographic planes of FNT1 phase. This is supported by XRD studies. In the presence of UV light, FNT1 (0.1g/50mL) reduces the 4-nitrophenol (4-NP) (0.0139gL) to 4-aminophenol by using NaBH (0.054gL) in contrast to pure TiO and other composites of FeNbTiO photocatalysts. The 4-NP is reduced to 4-aminophenol within 10min in the presence of FNT1 and UV light, but in the absence of the catalysts, it takes approximately 82min. The catalytic activity of FNT1 is enhanced significantly in the presence of UV light compared to the absence of UV light. We observed that the catalytic activity of the prepared catalyst also depends on crystal size, particle morphology and particle porosity, and dopant concentrations.