Topic
Sodium sulfide
About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.
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TL;DR: In this article, a variety of nitroaromatics was reduced by using aqueous sodium sulfide, and tetrabutylammonium bromide (TBAB) as the phase transfer catalyst by choosing appropriate concentrations which resulted in three immiscible liquid phases.
Abstract: The selective reduction of nitroaromatics to the corresponding amines is an important transformation since many aromatic amines exhibit biological activities and find a multitude of industrial applications, being intermediates for the synthesis of dyes, pharmaceuticals and agrochemicals. A variety of nitroaromatics dissolved in organic solvents was reduced by using aqueous sodium sulfide, and tetrabutylammonium bromide (TBAB) as the phase transfer catalyst by choosing appropriate concentrations which resulted in three immiscible liquid phases. Compared to L-L PTC, the L-L-L PTC offers much higher rates of reaction, better selectivities and repeated use of catalyst. The selectivities for the desired products were 100%.
56 citations
TL;DR: In this article, the flotation behavior of anglesite and cerussite has been studied as a function of additions of amyl xanthate, primary amine, sodium carbonate and sodium sulfide as well as pH.
56 citations
TL;DR: The catalytic and photocatalytic activities of supported cobalt or zinc phthalocyanine complexes, bulk MoS2, MoS 2 deposited on Al2O3, K0.33 H2O 0.66 MoS, CdS and polycrystalline nickel phosphorus trisulfide (NiPS3) have been investigated in the oxidation of sodium sulfide and Na2S2O 3.
Abstract: The catalytic and photocatalytic activities of supported cobalt or zinc phthalocyanine complexes, bulk MoS2, MoS2 deposited on Al2O3, potassium intercalated MoS2 (K0.33 H2O0.66 MoS2), CdS and polycrystalline nickel phosphorus trisulfide (NiPS3) have been investigated in the oxidation of sodium sulfide and Na2S2O3. The phthalocyanine complexes and the metal chalcogenides do not catalyze, in the absence of light, the complete oxidation of the sulfide ion to sulfate ion. The final product of the catalytic oxidation is the formed thiosulfate. No oxidation of Na2S2O3 has been registered in the dark in the presence of any of the catalytic samples. Their activity was enhanced upon irradiation with visible light. Thiosulfate appears to be the final product also of the photooxidation of the sulfide ion catalyzed by metal chalcogenides. They do not catalyze the further photooxidation of Na2S2O3. The only photocatalysts which favour with their presence the oxidation of the sulfide and thiosulfate ions to sulfate ion, are the zinc phthalocyanine complexes. In this case, the photooxidation process involves singlet oxygen.
56 citations
TL;DR: The mixing of waste solution obtained from chrome tanning process and waste solution derived from liming of bovine leather was investigated and indicated that the mixing of the corresponding waste solutions yields the mixture effluents that are ecologically acceptable.
55 citations
TL;DR: In this paper, a nonaqueous passivation regime consisting of Na2S/benzene/15-crown-5/oxidant was reported, which resulted in higher photoluminescence (PL) intensity, lower oxide content, and a less amount of elemental Sb than aqueous passivated surfaces.
Abstract: We report a nonaqueous passivation regime consisting of Na2S/benzene/15-crown-5/oxidant. The use of a nonpolar, aprotic organic medium required the addition of a specific chelating agent (15-crown-5) to solubilize sodium sulfide, and organic oxidizing agents (anthraquinone, benzophenone, etc.) to act as electron acceptors. The surface optical and chemical properties of GaSb surfaces after aqueous and nonaqueous sulfide treatments were compared. Nonaqueous passivation resulted in higher photoluminescence (PL) intensity, lower oxide content, and a less amount of elemental Sb than aqueous passivation. The PL intensity from passivated surfaces was correlated with the standard reduction potentials of electron acceptors.
55 citations