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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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Patent
09 Aug 1978
TL;DR: A method for oxidizing and removing remaining sodium sulfide as well as generated sulfur compounds by introducing oxygen into cooking liquor at high temperature and high pressure in the end stage of kraft cooking is described in this paper.
Abstract: A method for oxidizing and removing remaining sodium sulfide as well as generated sulfur compounds by introducing oxygen into cooking liquor at high temperature and high pressure in the end stage of kraft cooking.

6 citations

Patent
Su Chen, Chen Jie, Qiang Zhang, Jin Zhou, Ziyi Yu 
15 Aug 2012
TL;DR: In this paper, a method for preparing a luminescence-adjustable ligand-free cadmium sulfide quantum dot is described, which does not need any organic molecules as ligands, has good stability and can be effectively hybridized with organic materials.
Abstract: The invention discloses a method for preparing a luminescence-adjustable ligand-free cadmium sulfide quantum dot. The quantum dot does not need any organic molecules as ligands, has good stability, can be effectively hybridized with organic materials and prevents the phenomenon of phase separation in the hybridization process, and the luminescence wave length can be precisely adjusted along with a synthesis condition. According to the preparation method of the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot, cadmium acetate, cadmium propionate or cadmium stearate is selected as a cadmium source, and thiourea or sodium sulfide is selected as a sulfur source, and the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot can be prepared without any organic molecules as a cladding agent.

6 citations

Journal ArticleDOI
TL;DR: In this paper, it was estimated that during hair burning liming process in the tannery, the soluble sulfide content in liming wastewater was determined by titrimetric method following the official methods of analysis of Society of Leather Technologist and Chemists.
Abstract: In tannery, liming is the first and indispensable chemical operation where raw hides/skins are treated with sodium sulfide and calcium hydroxide. Liming process releases wastewater containing soluble sulfide in the effluent. In this study, soluble sulfide in the wastewater was estimated during hair burning liming process in the tannery. The soluble sulfide content in liming wastewater was determined by titrimetric method following the official methods of analysis of Society of Leather Technologist and Chemists. It was estimated that, in Bangladesh, yearly 208–623 metric ton soluble sulfide is discharged only from the cowhide processing during hair burning liming process. The sulfide has an adverse impact on the environment including water bodies, atmosphere, land, and plant. Liming wastewater mixing with lower pH wastewater releases hydrogen sulfide gas which has negative effects on the human health and atmosphere. Tanner should use the alternative unhairing methods, e.g., enzymatic, sweating for the cleaner production.

6 citations

Patent
21 May 1998
TL;DR: In this paper, a sulfurous gas stream comprising hydrogen sulfide and carbon disulfide, such as produced as a byproduct of the rayon-forming process, is processed to recover the components in a useable form.
Abstract: Sulfurous gas streams comprising hydrogen sulfide and carbon disulfide, such as produced as a by-product of the rayon-forming process, are processed to recover the components in a useable form. The gas stream first is contacted with an aqueous sodium hydroxide to dissolve out hydrogen sulfide and some of the carbon disulfide. The dissolved carbon disulfide is driven off from the solution and condensed as a liquid concentrate. Carbon disulfide receiving in the gas stream is recovered, such as by condensation. The aqueous sodium sulfide solution which remains is concentrated and the pH is adjusted, as necessary, to a value at which the sodium sulfide is predominantly in the form of sodium bisulfide. The concentrated sodium bisulfide solution is capable of reuse in the rayon-forming process along with the liquid concentrate of carbon disulfide.

6 citations

Journal ArticleDOI
TL;DR: In this paper, a controllable size of zinc sulfide nanoparticles was synthesized by chemical precipitation and the optical band gap ranged from 4.13 to 4.31 eV depending on particle size.
Abstract: Zinc sulfide nanoparticles with controllable size were synthesized by chemical precipitation. Results from transmission electron microscopy and x-ray powder diffraction showed the samples were grown with the cubic phase. Particle size was varied by varying the molar ratio of zinc chloride to sodium sulfide in the presence of poly(ethylene glycol). The optical band gap was calculated on the basis of ultraviolet–visible spectroscopy and ranged from 4.13 to 4.31 eV depending on particle size. Surface passivation and adsorption of poly (ethylene glycol) on the nanoparticles was explained on the basis of Fourier-transform infrared measurements.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202325
202233
202136
2020107
2019143
2018172