Introduction Of MoS2 Research Articles

Bisphenol A removal on TiO 2 –MoS 2 –reduced graphene oxide composite by adsorption and photocatalysis

Bisphenol A (BPA) is a well-known, representative endocrine disruptor chemical, which can cause adverse effects on human health and environment. In this work, we prepared TiO2–MoS2–reduced graphene oxide (denoted as TiO2–MoS2–RGO) ternary hybrid photocatalyst to remove it by adsorption and photocatalysis. The prepared photocatalyst were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD). The mass ratio of MoS2 in the composite was optimized. The results indicated that the anatase TiO2 and MoS2 were anchored on the reduced graphene oxide, and the optimum mass ratio of MoS2 in TiO2–MoS2–reduced graphene oxide was 1.0% (denoted as TiO2–1MoS2–RGO). Under the same photocatalytic degradation condition, BPA adsorption removal ratios over TiO2, P25, TiO2–1MoS2, TiO2–RGO and TiO2–1MoS2–RGO were 0.75%, 0.79%, 2.30%, 24.00% and 22.10%, photocatalytic degradation removal ratios were 17.20%, 19.90%，27.33%, 26.30% and 40.30% and the total removal ratios were 17.95%, 21.69%, 29.66%, 50.30% and 62.40%, respectively. The results indicated that TiO2–1MoS2–RGO exhibited highest adsorption and photocatalytic degradation activity among them and the introduction of MoS2 in the TiO2–RGO can reduce the electron-hole pair combination and enhance photocatalytic activity of TiO2 for BPA greatly.

Polyamide 6/carbon black/molybdenum disulphide composites: Friction, wear and morphological characteristics

The objective of this research work is to evaluate the tribological and physico–mechanical properties of molybdenum disulphide (MoS2) loaded polyamide 6 composites in the presence of carbon black (CB). Polyamide 6 containing 1 wt% of carbon black powder was compounded and extruded with varying amounts viz., 0.5, 1.0, 2.0 and 3.0 wt%, MoS2 in a co-rotating twin screw extruder. The fabricated polyamide 6 composites have been evaluated for tribological properties such as wear loss, specific wear rate and coefficient of friction, and physico–mechanical properties such as water uptake, density, surface hardness, tensile properties and impact strength. The effect of molybdenum disulphide content, abrading loads, sliding velocities and sliding distances on wear characteristics of the polyamide 6/CB/MoS2 composites were evaluated using a pin-on-disc equipment. It was found that the introduction of MoS2 has significantly reduced the, wear loss and friction behavior of pristine polyamide 6. Worn surfaces were examined by scanning electron microscopy (SEM) to have better insight on the wear mechanism. Furthermore the polyamide 6 composites showed significant improvement in tensile behavior. Additionally, the thermal characteristics of the composites also have been studied by using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA).

Microstructure, thermal, physico-mechanical and tribological characteristics of molybdenum disulphide-filled polyamide 66/carbon black composites

With an objective to investigate the influence of molybdenum disulphide (MoS2) on physico–mechanical and tribological properties of polyamide 66 (PA 66), was compounded with MoS2 in the presence of carbon black (CB). The compounded material was injection molded to make test specimens to evaluate physico–mechanical, thermal, and tribological (wear, friction, and laser etching) characteristics. It was found that tensile strength, percentage elongation at break, and tensile modulus of PA 66/CB/MoS2 composite increased linearly with increase in MoS2 content. The impact strength of the PA 66 matrix increased from 37.2 to 43.2 J/m with an increase in MoS2 content. The wear behavior of PA 66/CB/MoS2 composites have been investigated under dry sliding conditions at different normal loads, sliding distances, and sliding velocities at room temperature. It was found that the introduction of MoS2 in the presence of CB has certainly reduced the friction, wear behavior of PA 66 with improvement in laser etching resistance. MoS2 could increase the adhesion between the transfer film and the counterface surface. The ability of the synergistic fillers in helping the formation of thin, uniform, and continuous transfer film would contribute to enhance the wear resistance of PA 66 composites. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers