Solar energy, with its advantages of safety, reliability, cleanliness, and wide distribution, has seen a significant increase in photovoltaic (PV) installations. However, this growth has led to a large number of end of life PV modules. The adhesive effect of EVA (ethylene–vinyl acetate) makes it difficult to effectively separate and recycle the various layers of these modules. Therefore, the key to recycling silicon PV modules lies in removing or weakening the adhesive properties of EVA while protecting core components such as silicon from damage, thereby achieving efficient separation and recycling of the layers. This paper proposes a novel green treatment method using N-methylpyrrolidone (NMP) as a solvent for recycling discarded PV modules. Through experimental studies, we investigated the effects of different NMP treatment conditions-including temperature, time, sheet size, and rotor speed-on the reaction rate of EVA. The optimal processing condition was found to be heating at 150 °C for 45 min. Kinetic fittings were performed under various conditions, and parameters were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and contact angle measurements. The mechanism of the reaction between NMP and EVA was analyzed. Finally, experiments were conducted on Commercial PV modules to develop a fundamentally harmless recycling process. A life cycle assessment of this recycling process was also carried out, providing theoretical guidance for future applications of NMP in the treatment of waste silicon PV modules.
High-quality four-layer molybdenum disulfide (MoS 2 ) nanosheets with lateral dimension of about 11 µm were prepared by ultrasonic treatment of MoS 2 powder with assistance of 1-methyl-2-pyrrolidone (NMP) solvent. The optimal preparation conditions for the preparation of MoS 2 nanosheets were investigated from the aspects of ultrasonic processing time, ultrasonic power and amount ratio of MoS 2 powder and NMP solvent. At the same time, the MoS 2 nanosheets were employed as anode buffer layer in organic light-emitting diode (OLED) with copper nanowire (CuNW) film being anode. MoS 2 nanosheets can reduce roughness of CuNW film, protect CuNW film from oxidation and improve work function of CuNW film. Experiments show that MoS 2 nanosheets can significantly improve the current density and brightness of the OLED with CuNW film being anode. The maximum brightness of the OLED with MoS 2 anode buffer layer is 2.15 times that of the OLED without MoS 2 anode buffer layer. The current density of the OLED with MoS 2 anode buffer layer is also obviously increased compared with the OLED without MoS 2 anode buffer layer.
Kirill A. Alferov,Zhongwei Fu,Shuxian Ye,Dongmei Han,Shuanjin Wang,Min Xiao,Yuezhong Meng
A new one-pot synthesis method of dimethyl hexane-1,6-diyldicarbamate (HDC), a potential intermediate compound in the synthesis of polyurethanes, from CO2, methanol, and 1,6-hexanediamine (HDA) is disclosed. The starting materials are renewable, stable, easily available, and cheap. The process was implemented in 1-methyl-2-pyrrolidinone (NMP) solvent over CeO2 catalysts. Three different CeO2 catalysts (commercial nanospheres, CeO2(c) obtained by direct calcination of (NH4)2Ce(NO3)6, and CeO2 nanorods) were tested in this reaction and their micromorphology and physical–chemical properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and N2 adsorption. CeO2 nanorods proved to be the most active catalytic material. The influence of different parameters on reaction outcome was studied. The yield of HDC was about 80% under optimized reaction conditions. Experiments for better understanding of reaction mechanism were also performed.
危险品化学品经营许可证（带存储）