Applications of transition metal dichalcogenides for water filtration of Tungsten Disulfide

What is Tungsten Disulfide?
Tungsten disulfide (WS2) is a solid lubricant with a lamellar structure similar to MoS2. He also correlated the tribological properties to the axial ratio c0/na0, which must exceed 1.87 to have a low friction coefficient. This ratio equals 1.95 for 2H–MoS2 and 1.96 for 2H–WS2. In Figure 14.1, the metal elements surrounded by dashed lines form lamellar structures when bonded with sulfur or selenium. Still, only sulfides and selenides of molybdenum and tungsten have favorable tribological properties. The WS2–carbon and WS2 powders’ crystal structures were investigated by X-ray diffractometry (XRD, Rigaku DMAX-33) using Cu Kα radiation at the Korea Basic Science Institute (Daegu). The morphologies of the powders were characterized using scanning electron microscopy (SEM, JEOL JSM-6060) and high-resolution transmission electron microscopy (TEM, JEOL JEM-2010). The specific surface areas of the bare WS2 and WS2-carbon composite powders were calculated by Brunauer–Emmett–Teller (BET) analysis of nitrogen-adsorption measurements (Micromeritics TriStar 3000). The electrochemical properties of the WS2–carbon and WS2 powders were measured using 2032-type coin cells. The electrodes were prepared by mixing 35 mg of the active powders, 10 mg of carbon black (Super P) as a conductive material, and 5 mg of sodium carboxymethyl cellulose (CMC) using distilled water. Lithium metal and a microporous polypropylene film were used as the counter electrode and separator. LiPF6 (1 M) in a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) in a 1:1 volume ratio with five wt% fluoroethylene carbonate (FEC) was used as the electrolyte (Techno Semichem Co.). The entire cell was assembled under an argon atmosphere in a glove box. The charge/discharge characteristics and electrochemical impedance spectroscopy (EIS) measurements of the samples were measured at 100 mA g−1 in the voltage range of 0.001–3 V. Cyclic voltammetry (CV) measurements were carried out at a scan rate of 0.4 mV s−1.

Tribological studies of the sintered bronze—tungsten disulfide composites
Copper-tin alloy with the addition of tungsten disulfide (WS2), prepared through powder metallurgical route, is widely used in weaving and aircraft industries as bearings and bushes. The incorporation of WS2 helps to reduce sliding contact between machine components, especially where no grease and oil lubricant is used. Bronze—WS2 sintered composite with a different volume percentage of WS2 at the different constituents of the copper-tin alloy and varying compaction load was produced. The sintered composite exhibits a reduction in porosity and an increase in relative density. The related terms like theoretical, green, sintered, and relative density of the composite were calculated. It was concluded that the porosity of the composites decreased with a rise in the volume percentage of WS2. The effect of variation in the composition of bronze, volume of WS2 content, and compaction load on the tribological behavior of the composites was investigated. It was observed that the hardness of the composites decreased with the increase in the volume percentage of WS2 and increased with the increase in compaction load. The scratch test for all the specimens as a constant load of 10 N was conducted, and scratch width, coefficient of friction, and wear loss were measured and reported.

Applications of transition metal dichalcogenides for water filtration of Tungsten Disulfide
Emerging 2D nanostructured transition metal dichalcogenides such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2) are highly hydrophobic and have extremely low friction. These materials can deter the settlement of fouling organisms and provide low adhesion of any fouling that occurs. Fouling is one of the major challenges that modern engineers face when operating water filtration membranes. Transition metal dichalcogenides can certainly be the potential candidates in this field. Their unique properties can deter fouling microorganisms’ attachment when high ions are present in water. Electron redistribution between Mo and S in MoS2 makes the nanopores edge atoms in the filter intrinsically charged when nanopores are introduced in MoS2. These charged pore edges are important in altering the ion selectivity and water permeability. Unlike graphene-based filters, it has been investigated that the “open” and “closed” states of the MoS2 filter can be regulated with the introduction of mechanical strain. The open state of the MoS2 filter results in high water transparency. Integrating nano-WS2 well dispersed in the polymers, such as polyether ether ketone (PEEK), has enhanced the thermal stability and mechanical strength of the hybrid nanocomposites. In one study, blended PES–WS2 flat-sheet membranes with the incorporation of ultra-low concentrations of nanoparticles (from 0.025% to 0.25%, WS2/PES ratio) were investigated in terms of permeability, fouling resistance, and solute rejection. The optimum permeability of the membrane was found with 0.075%–0.1% WS2/polymer concentration ratios, and fouling resistance was increased by almost 50%. Moreover, solute rejection was significantly enhanced after incorporating nanoparticles into the membrane structure.

Price of Tungsten Disulfide
Tungsten Disulfide particle size and purity will affect the product’s Price, and the purchase volume can also affect the cost of Tungsten Disulfide. A large amount of large amount will be lower. The Price of Tungsten Disulfide is on our company’s official website.

Tungsten Disulfide supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Tungsten Disulfide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Tungsten Disulfide, you are welcome to contact us or inquire at any time.

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