121-57-3Relevant academic research and scientific papers
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).
Modification of activated carbons based on diazonium ions in situ produced from aminobenzene organic acid without addition of other acid
Lebegue, Estelle,Madec, Lenaic,Brousse, Thierry,Gaubicher, Joel,Levillain, Eric,Cougnon, Charles
, p. 12221 - 12223 (2011)
Activated carbon products modified with a benzene sulfonic acid group were prepared based on the spontaneous reduction of diazonium salts in situ generated in water without addition of an external acid. The diazotization reaction assisted by the organic acid substituent, produced at once amine, diazonium and triazene functionalities that maximize the grafting yield by a chemical cooperation effect.
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.]
Synthesis and characterization of polyaniline/nickel oxide composites for fuel additive and dyes reduction
Jamil, Saba,Ahmad, Zunaira,Ali, Muhammad,Rauf Khan, Shanza,Ali, Sarmed,Amen Hammami, Mohamed,Haroon, Muhammad,Saleh, Tawfik A.,Ramzan Saeed Ashraf Janjua, Muhammad
, (2021)
Polyaniline (PANI) and Polyaniline/Nickel oxide (PANI/NiO) composites are prepared to use as a potential catalyst, by Chemical oxidation method using ammonium persulfate (NH4)2S2O8)) as an oxidant. Nickel oxide (NiO) nanopartiles are prepared by Sol-gel method. The synthesized products were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction technique (XRD). The prepared PANI/NiO composites are used as additive with different concentrations in diesel to investigate their efficiency as fuel additive. The catalytic properties are studied by using the synthesized products as catalyst for reduction of dyes in aqueous media. Sodium borohydride (NaBH4) is used as reducing agent. Linear relationships are obtained between time and ln(A0/At) for Methyl orange and Methylene blue. Kapp values were obtained for three catalysts showed the increasing trend of reduction for both dyes as, PANI NiO PANI/NiO composites. Experimental data analysis proved PANI/NiO composites to be efficient catalysts and fuel additive as compared to PANI and NiO.
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.].
Palladium nanoparticles produced and dispersed by Caldicellulosiruptor saccharolyticus enhance the degradation of contaminants in water
Shen, Nan,Xia, Xiu-Yang,Chen, Yun,Zheng, Hang,Zhong, Yong-Chen,Zeng, Raymond J.
, p. 15559 - 15565 (2015)
This study focused on examining the general applicability of coupling bio-palladium (Pd) nanoparticle generation and bio-H2 produced by Caldicellulosiruptor saccharolyticus for wastewater treatment under extreme thermophilic conditions. Na2PdCl4 was added to cell cultures to achieve a final Pd concentration of 50 mg L-1. Methyl orange (MO) and diatrizoate were chosen as the contaminants in water. In the cultures with, and without, Pd added, MO (100 mg L-1) was degraded within 30 min and in over 6 h, respectively. Diatrizoate (20 mg L-1) was degraded within 10 min in Pd-added cultures. However, no diatrizoate degradation happened without Pd addition. The degradation rates were correlated positively with dissolved hydrogen generated by C. saccharolyticus. Furthermore, the catalytic actions of Pd(0) nanoparticles and cells were distinguished during the degradation process. MO was degraded under the combined action of Pd(0) and hydrogenase. However, Pd(0) was the essential catalyst, and hydrogenase had no effect on the deiodination of diatrizoate within 20 min. Pd(0) particles were dispersed well by the cells of C. saccharolyticus and showed a better catalytic activity than Pd(0) formed without cells. Dissolved hydrogen produced by C. saccharolyticus should be the perfect reduction equivalent for Pd formation and for reducing degradation. Therefore, Pd should be added to C. saccharolyticus cultures to enhance the degradation of contaminants in water. This journal is
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.
Degradation of cationic and anionic dyes in coagulation-flocculation process using bi-functionalized silica hybrid with aluminum-ferric as auxiliary agent
Lau, Yen-Yie,Wong, Yee-Shian,Teng, Tjoon-Tow,Morad, Norhashimah,Rafatullah, Mohd,Ong, Soon-An
, p. 34206 - 34215 (2015)
Cationic dye (methylene blue) and anionic dye (methyl orange) degradation in the coagulation process was demonstrated. The key material was a natural coagulant-laterite soil dominated by a silica component, while aluminum-ferric ions acted as an auxiliary agent in the degradation process. Charge neutralization, electrical double layer compression and sweeping flocculation were the mechanisms in the decolorization reaction. These results provided a new insight into effective dye degradation using a new class of natural coagulant-natural resources (laterite soil). The complex molecular structure of methylene blue and methyl orange was degraded into smaller hydrocarbon forms, accompanied by the formation of silsesquioxane. The silsesquioxane was the final product of degradation with promising flocculation and low volume sludge. Lastly, a comparison of the aluminum-based coagulant and a laterite soil natural coagulant shows a clear vision of the performance for both types of coagulant.
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.
Photolysis and photocatalytic decomposition of sulfamethazine antibiotics in an aqueous solution with TiO2
Tzeng, Tai-Wei,Wang, Shan-Li,Chen, Chiing-Chang,Tan, Chen-Chung,Liu, Yu-Ting,Chen, Tsan-Yao,Tzou, Yu-Min,Chen,Hung
, p. 69301 - 69310 (2016)
Photo-decomposition of sulfamethazine (SMT) involves photolytic and photo-catalytic reactions, which occur simultaneously. The relative contributions of these two reactions to the overall SMT photo-decompositions by TiO2 and the intermediates of SMT photo-decompositions were systematically examined with the effects of TiO2 loading, and the pH and the initial SMT concentrations in the solutions. The apparent rate constants of SMT photo-decomposition reactions, which were well described by the pseudo-first-order kinetic model, ranged from 0.24 to 1.61 h-1. The overall photo-decomposition efficiencies of 0.072 mM SMT were the highest at pH 5.5 with 0.5 g L-1 TiO2 due to the adsorption-induced photocatalytic decomposition of SMT on TiO2. However, the SMT photolysis occurred more rapidly at pH 10. Two reactive species of holes and hydroxyl radicals concurrently participated in the photocatalytic decomposition of SMT, and the latter dominated the oxidative reactions of SMT on TiO2. Eight intermediates of SMT photo-decomposition were determined using LC-MS. Their time-dependent distributions indicated that the photo-decomposition of SMT was triggered by hydroxylation on aniline and dimethylpyrimidinyl moieties, followed by the cleavage of the S-N bond of SMT. Our results illustrated that the intermediates with dimethylpyrimidinyl groups possess strong resistance to photo-decomposition and played a determinant role in the photo-decomposition of SMT.
