121-57-3Relevant articles and documents
The Photochemistry of Metanilic Acid: Photoisomerization and Photodegradation
Lally, John M.,Spillane, William J.
, p. 1571 - 1572 (1987)
In the photolysis of sodium metanilate (1,Na) a single triplet and a series of ?-complexes give rise to the isomeric aniline sulphonic acids (2) and (3) and aniline (4).
Conjugated Microspheres FeTCPP–TDI–TiO2 with Enhanced Photocatalytic Performance for Antibiotics Degradation Under Visible Light Irradiation
Yao, Binghua,Peng, Chao,He, Yangqing,Zhang, Wen,Zhang, Qinku,Zhang, Ting
, p. 2543 - 2554 (2016)
Abstract: Toluene disocyanate (TDI) was used as a bridging molecule, a bridge bonding conjugated microsphere (FeTCPP–TDI–TiO2) was successfully prepared by grafting tetra-(carboxyphenyl) porphyrin iron (FeTCPP) on the surface of TiO2 microspheres. The FT-IR spectra revealed that the hydroxyl group (–OH) of TiO2 microspheres surface and the carboxyl group (–COOH) of FeTCPP reacted respectively with the active isocyanato groups (–NCO) of TDI to form a surface conjugated microsphere FeTCPP–TDI–TiO2. The UV–vis DRS analysis demonstrated that the formation of FeTCPP–TDI–TiO2 extended remarkably the photoresponse of as-prepared samples to visible light region. The photocatalytic activity of FeTCPP–TDI–TiO2 was evaluated using the photocatalytic degradation of norfloxacin (NFC), tetracycline (TC) and sulfapyridine (SPY) antibiotics in aqueous solution under visible-light irradiation. The results showed that, TDI, as a bond unit, was used to form a steady chemical bridging bond linking between FeTCPP and the surface of TiO2 microspheres, and the prepared catalyst exhibited higher photocatalytic activity under visible-light irradiation for antibiotics degradation in comparison with P25. The degradation of antibiotics all followed the pseudo first-order reaction model under visible light irradiation, and the degradation mechanisms of NFC, TC and SPY were also proposed. Graphical Abstract: [Figure not available: see fulltext.]
Spillane,Scott
, p. 1251 (1967)
Novel Biomass-Derived Fe3O4@Pd NPs as Efficient and Sustainable Nanocatalyst for Nitroarene Reduction in Aqueous Media
Zhao, Linwei,Zheng, Kai,Tong, Jianying,Jin, Jianzhong,Shen, Chao
, p. 2607 - 2613 (2019)
Abstract: A novel magnetically recyclable nitrogen-doped Fe3O4@Pd NPs was prepared from the biomass-based materials which was employed as carbon and nitrogen source. The as-prepared catalysts were fully characterized by a variety of physicochemical techniques and were exploited for nitroaromatic hydrogenation with broad scope and excellent chemoselectivity using molecular hydrogen as a reductant. The heterogeneous catalysts can be recovered easily and reused for at least eight recycling reactions without obviously loss of catalytic properties. In addition, using this protocol, the key intermediate of marketed drug Osimertinib could be synthesized easily. Graphical Abstract: [Figure not available: see fulltext.].
Reduction of azo dyes with zero-valent iron
Nam, Sangkil,Tratnyek, Paul G.
, p. 1837 - 1845 (2000)
The reduction of azo dyes by zero-valent iron metal (Fe0) at pH 7.0 in 10 mM HEPES buffer was studied in aqueous, anaerobic batch systems. Orange II was reduced by cleavage of the azo linkage, as evidenced by the production of sulfanilic acid (a substituted aniline). Adsorption of the dyes on iron particles was less than 4% of the initial concentration, and >90% mass balance was achieved by summing aqueous concentrations of dye and product amine. All of the 9 azo dyes tested were reduced with first-order kinetics. The kinetics of decolorization at the λ(max) of each dye were rapid: a typical k(obs) was 0.35 ± 0.01 min-1 for Orange II at 130 rpm on an orbital shaker, corresponding to a surface area normalized rate constant (k(SA)) of 0.21 ± 0.01 L m-2 min-1. The rate of reduction of Crocein Orange G varied with initial dye concentration in a way that suggests saturation of surface sites on the Fe0, and varied with the square-root of mixing rate (rpm) in a manner indicative of mass transfer limited kinetics. Correlation analysis using k(obs) for all of the azo dyes, estimates of their diffusion coefficients, and calculated energies of their lowest unoccupied molecular orbitals (E(LUMO)), gave no strong trends that could be used to derive structure-activity relationships. Using an authentic sample of wastewater from a dye manufacturing operation and construction-grade granular Fe0, rapid decolorization was achieved that was consistent with reduction of azo dyes. (C) 2000 Elsevier Science Ltd. The reduction of azo dyes by zero-valent iron metal (Fe0) at pH 7.0 in 10 mM HEPES buffer was studied in aqueous, anaerobic batch systems. Orange II was reduced by cleavage of the azo linkage, as evidenced by the production of sulfanilic acid (a substituted aniline). Adsorption of the dyes on iron particles was less than 4% of the initial concentration, and >90% mass balance was achieved by summing aqueous concentrations of dye and product amine. All of the 9 azo dyes tested were reduced with first-order kinetics. The kinetics of decolorization at the λmax of each dye were rapid: a typical kobs was 0.35±0.01 min-1 for Orange II at 130 rpm on an orbital shaker, corresponding to a surface area normalized rate constant (kSA) of 0.21±0.01 L m-2 min-1. The rate of reduction of Crocein Orange G varied with initial dye concentration in a way that suggests saturation of surface sites on the Fe0, and varied with the square-root of mixing rate (rpm) in a manner indicative of mass transfer limited kinetics. Correlation analysis using kobs for all of the azo dyes, estimates of their diffusion coefficients, and calculated energies of their lowest unoccupied molecular orbitals (ELUMO), gave no strong trends that could be used to derive structure-activity relationships. Using an authentic sample of wastewater from a dye manufacturing operation and construction-grade granular Fe0, rapid decolorization was achieved that was consistent with reduction of azo dyes.
-
Scott,F.L. et al.
, p. 2666 - 2670 (1972)
-
Homogeneous palladium nanoparticles surface hosts catalyzed reduction of the chromophoric azo (-N=N-) group of dye, acid orange 7 by borohydride in alkaline media
Das, Ranendu Sekhar,Singh, Bula,Mandal, Arabinda,Banerjee, Rupendranath,Mukhopadhyay, Subrata
, p. 746 - 758 (2014)
In alkaline media, well-characterized gelatin-stabilized palladium (GPd) nanoparticles catalyze the reduction of the azo group containing pollutant dye, Acid Orange 7 (AO7) by sodium borohydride (NaBH4) to 1-amino-2-napthol and sulfanilic acid. Kinetic observations and detailed FTIR studies suggests that the reaction follows Langmuir-Hinshelwood kinetic model, where during the reaction both AO7 and borohydride are adsorbed on the GPd surface. Plots of lnko versus ln[AO7] or ln[NaBH4] show that the order of reaction with respect to AO7 and NaBH4 remains almost same over different molar ratios of [NaBH4]/[AO7]. The catalyzed reaction shows an initial induction period (t0) due to a surface-restructuring process of GPd nanoparticles, and (1/t0) can be defined as the rate of surface restructuring. The activation energy of the catalyzed reaction and energy of the surface-restructuring process of GPd are estimated as 22 ± 3 and 25 ± 7 kJ M-1, respectively.
Cyan color-emitting nitrogen-functionalized carbon nanodots (NFCNDs) from Indigofera tinctoria and their catalytic reduction of organic dyes and fluorescent ink applications
Abirami, Natarajan,Arul, Velusamy,Arulmozhi, Rajaram,Kavitha, Ganesan,Vinoth Kumar, Jothi
, p. 27745 - 27756 (2021)
The present study reports the synthesis of nitrogen-functionalized carbon nanodots (NFCNDs) by a low-cost hydrothermal method using the leaf extract of Indigofera tinctoria as a novel carbon precursor. The synthesized NFCNDs were characterized by diverse spectroscopic techniques. The optical properties of N-CNDs were analyzed by UV-visible and fluorescence spectroscopic studies. The quantum yield (QY) for the prepared NFCNDs was found to be 12.6%. The surface morphology, functional groups, and crystallinity of NFCNDs were evaluated by HR-TEM, FT-IR, XRD and Raman spectroscopic methods, respectively. The Raman results revealed the moderate graphite structure of NFCNDs, and the calculated ID/IG value was 0.49. The spherical appearance of the synthesized NFCNDs was confirmed by HR-TEM, and the calculated size of the NFCNDs was 4 nm. The XRD and SAED pattern results gives an evidence for the amorphous nature of the prepared NFCNDs. The thermal stability of NFCNDs was studied by TGA analysis. The resulting NFCNDs acted as a green nanocatalyst and thus efficiently improved the reducing capability of sodium borohydride (NaBH4) in the catalytic reduction of methylene blue (MB) and methyl orange (MO) dyes. Furthermore, the bright cyan emission characteristics of synthesized NFCNDs were utilized as a labeling agent in anti-counterfeiting applications.
-
Voronkov,M.G. et al.
, (1977)
-
Scale-up synthesis of zero-valent iron nanoparticles and their applications for synergistic degradation of pollutants with sodium borohydride
Ravikumar,Dubey, Swati,pulimi, Mrudula,Chandrasekaran, Natarajan,Mukherjee, Amitava
, p. 589 - 598 (2016)
The scale-up synthesis of nZVI (zero-valent iron nanoparticles) was optimized by response surface modeling (RSM). The synthesized nZVI was employed for synergistic degradation of metronidazole (MNZ) or methyl orange (MO) in the presence of sodium borohydr
Cornforth and Corey-Suggs reagents as efficient catalysts for sulfonation of aromatic and heteroaromatic compounds using NaHSO3 under solvent free and microwave conditions
Fatima, Touheeth,Duguta, Govardhan,Purugula, Venkanna,Yelike, Hemanth Sriram,Kamatala, Chinna Rajanna
, p. 1001 - 1006 (2020/07/27)
Cornforth and Corey-Suggs reagents Pyridinium Dichromate (PDC) and Pyridinium Chlorochromate (PCC) were explored as efficient catalysts for sulfonation of aromatic and heteroaromatic compounds using NaHSO3 in aqueous acetonitrile medium at room temperature within 1–4 h, while microwave assisted reactions took place within 1–4 min under solvent-free conditions. These observations indicate significant rate accelerations in microwave assisted reactions. which were explained due to the bulk activation of molecules induced by insitu generated high temperatures and pressures when microwaves are transmitted through reaction medium.
