In the realm of photocatalysis, effectively utilizing solar energy, especially the near-infrared (NIR) spectrum, presents substantial challenges. To tackle this issue, a novel composite of NaYF4:Yb3+/Er3+@Cu2O@MoS2@Fe3O4 (denoted as NYE@Cu2O@MoS2@Fe3O4) was ingeniously fabricated and assessed for the photodegradation of organic contaminants. By harnessing the distinct properties of upconversion materials, narrow bandgap semiconductors, and magnetic substances, the NYE@Cu2O@MoS2@Fe3O4 catalyst possesses a photodegradation rate of 92% for the rhodamine B dye under NIR light radiation, which is superior to NYE@Cu2O (50%) and NYE@Cu2O@MoS2 (85%). The enhanced performance in the near-infrared photocatalysis of NYE@Cu2O@MoS2@Fe3O4 is mainly attributed to the synergistic effect of various components, which promotes an increase in photo-induced carrier generation and facilitates their efficient transfer and energy utilization under NIR irradiation. This study provides a possible route for the near-infrared photocatalytic degradation of pollutants in areas with limited light or even dark conditions.
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
The high flammability of ethylene vinyl acetate copolymers (EVA) limits its important applications in fire safety, and the addition of highly effective flame retardants can improve this deficiency. Melamine cyanurate (MCA) has limited carbon-forming ability and therefore is often combined with other flame retardants to achieve synergistic flame retardant effects and thus improve the flame retardancy of EVA. Therefore, in this study, MoS 2 @Fe 3 O 4 hybrid materials were synthesized by in-situ growth of molybdenum disulfide (MoS 2 ) and ferric oxide (Fe 3 O 4 ) and their structures were characterized using various techniques. The hybrids were blended with melamine cyanurate (MCA) into ethylene vinyl acetate copolymer (EVA) by melt blending method to reduce the fire hazard. The EVA composites with 1.0 wt% MoS 2 @Fe 3 O 4 blends significantly improved the coke residue and limiting oxygen index values to 22.5 % and 23.2 %, while their peak heat release rate, total heat release, and total smoke release were reduced by 62.5 %, 11.7 %, and 35.3 %, respectively, as compared to pure EVA. The results suggest that the use of MoS 2 @Fe 3 O 4 hybrids in combination with MCA is a promising strategy for the development of advanced flame-retardant materials.
Kaige Sun,Shangjian Mao,Weiquan Zhan,Chang Liu,Feifei Jia,Shaoxian Song
Magnetic MoS 2 could be easily separated from water or solid suspensions. In this work, shell-core structured MoS 2 @Fe 3 O 4 composite was fabricated through hydrothermal method and used as catalyst for recovering gold-thiosulfate complex ions (Au(S 2 O 3 ) 2 3− ) in aqueous solution. The results suggested that MoS 2 @Fe 3 O 4 composite could effectively in-situ reduce Au(S 2 O 3 ) 2 3− to gold particles (Au 0 ) with an extremely high reduction capacity of 1541.1 mg/g; moreover, the gold loaded MoS 2 @Fe 3 O 4 could be easily collected using a magnetic separator. The mechanism of reducing Au(S 2 O 3 ) 2 3− to Au 0 was ascribed to the photoexcited electrons from MoS 2 @Fe 3 O 4 composite. More importantly, the incorporation of Fe 3 O 4 could effectively enhance the transferred efficiency of photoexcited electrons and accelerate separation of electrons-holes pairs. With great gold reduction capacity and magnetic recyclability , the MoS 2 @Fe 3 O 4 composite could be a promising material for recovering gold from leaching solutions.
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