121-47-1Relevant articles and documents
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Fierz,Schlittler,Waldmann
, p. 663 (1929)
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Acid-resistant catalysis without use of noble metals: Carbon nitride with underlying nickel
Fu, Teng,Wang, Meng,Cai, Weimeng,Cui, Yuming,Gao, Fei,Peng, Luming,Chen, Wei,Ding, Weiping
, p. 2536 - 2543 (2014)
A nanocomposite able to function as a hydrogenation catalyst under strongly acidic conditions without the presence of noble metals is synthesized and thoroughly studied. This specially designed catalyst possesses a unique structure composed of carbon nitride (CN) with underlying nickel, in which the nickel endows the CN with new active sites for hydrogen adsorption and activation while it itself is physically isolated from the reactive environment and protected from poisoning or loss. The CN is inert for hydrogenation without the help of nickel. The catalyst shows good performance for hydrogenation of nitro compounds under strong acidic conditions, including the one-step hydrogenation of nitrobenzene in 1.5 M H2SO4 to produce p-amoniophenol, for which the acid in the reaction system has restricted the catalyst only to noble metals in previous studies. Further characterization has demonstrated that the nickel in the catalyst is in an electron-deficient state because some of its electron has been donated to CN (HRTEM, PES); thus, the hydrogen can be directly adsorbed and activated by the CN (HD exchange, in situ IR and NMR). With this structure, the active nickel is protected by inert CN from the corrosion of acid, and the inert CN is activated by the nickel for catalytic hydrogenation. The assembly of them gives a new catalyst that is effective and stable for hydrogenation even under a strongly acidic environment.
Cu-α-NiMoO4 photocatalyst for degradation of Methylene blue with pathways and antibacterial performance
Ray, Schindra Kumar,Dhakal, Dipesh,Kshetri, Yuwaraj K.,Lee, Soo Wohn
, p. 18 - 32 (2017/08/22)
Cu doped α-NiMoO4 photocatalyst has been synthesized by microwave hydrothermal method. The existence of Cu2+ ions at lattice position of α-NiMoO4 was observed on the basis of XRD, HRTEM, SAED, and EDS analysis. The negative zeta potential values indicate the stability of samples. Solar light driven photocatalytic degradation of Methylene blue (MB) dye in water was used to evaluate the photocatalytic performance of Cu doped α-NiMoO4 photocatalyst. The results revealed that there is an optimum Cu (4 mol%) doping level leads to highly enhanced photocatalytic activity of Cu-α-NiMoO4, as compared to α-NiMoO4 host. The experiment also suggested that active species (OH[rad], O2[rad]? and h+) play a crucial role in the scavenging system. The reduced energy band gap, oxygen vacancy, high BET surface area, and efficient separation of photogenerated electron/hole are responsible for enhancement of photocatalytic performance. MB photodegradation intermediates were identified by high resolution-quadruple time of flight electrospray ionization mass spectrometry (HR-QTOF ESI/MS) in positive ion mode and degradation pathway was proposed. Antibacterial performance was analyzed against Gram-positive (methicillin resistant Staphylococcus aureus and Bacillus Subtilis) and Gram-negative bacteria (Pseudomonas aeruginosa) via well-diffusion method. The formation of larger inhibition zone by small quantity of photocatalyst powder proved the excellent antibacterial performance. The inactivation of microorganism were found in following order: B.Subtilis ? S.aureus ? P.aeruginosa. The result of our study suggested that copper doped α-NiMoO4 photocatalyst is suitable for degradation of organic contaminates as well as effective for growth inhibition of multidrug-resistant microorganisms.
Asymmetric dioxazine compounds and method for dyeing or printing fiber materials using the same
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, (2008/06/13)
An asymmetric dioxazine compound represented by the following formula (I) in the free acid form: STR1 wherein A1 and A2 independently of one another are each sulfo, halo, alkyl or alkoxy, X1 and X2 independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R1 is hydrogen or unsubstituted or substituted alkyl, R2 and R3 independently of one another are each hydrogen, alkyl, alkoxy, halo or unsubstituted or substituted amino, Z is a fiber-reactive group, m and n independently of one another are each 0 or 1, provided that mn, and L is 1 or 2. This compound is suitable for dyeing and printing cellulose fiber, natural and synthetic polyamide fibers, polyurethane fiber, leather and the like and mixed yarns thereof, to obtain dyed or printed products of a color fast to light, wetness and chlorine with superior build-up and level dyeing properties.