جستجوی مقالات مرتبط با کلیدواژه "لباس محافظ" در نشریات گروه "مهندسی شیمی، نفت و پلیمر"

In the present study, a membrane of polybutylene terephthalate doped with multi-walled carbon nanotubes was prepared by the electrospinning process of nanofibers. Electron microscopy images of the synthesized nanocomposite proved the homogeneous structure and porous surface of the film. The capability and efficiency of the prepared fibers were tested by studying the adsorption of 2-chloroethyl ethyl sulfide as a mustard gas-like compound. Parameters affecting the morphology of nanofibers such as polymer concentration and the amount of multi-walled carbon nanotubes were investigated and optimized. Important variables in the mustard gas adsorption process included: ion strength, adsorption time and temperature. For this purpose, multivariate modeling based on experimental design using central composite design and response -surface methodology was used to optimize the factors affecting the process. The removal efficiency was 96% at the time of absorption of 12 minutes and the adsorption temperature was 30 ° C and the initial concentration of mustard-like agent was 20 mg L-1. The results of adsorption isotherms showed that the adsorption process of 2-chloroethyl ethyl sulfide by developed nanofibers follows the model of Langmuir (R2 = 0.991) and Friendlich (R2 = 0.986). The results of this study showed that PBT / MWCNTs nanocomposite membrane have good efficiency in adsorption and entrapment of mustard-like agent 2-chloroethyl ethyl sulfide and can be used to develop coatings against these compounds.

In this paper, polyacrylonitrile-nanopolyxomolybdate PAN-{Mo154} composite nanofibrous membrane was prepared by electrospinning under ambient conditions.  Nanofibers with an average fiber diameter of 100 nm were obtained under optimized conditions: 8wt.% of polyacrylonitrile, applied voltage of 12 kV, feed rate of 0.1 ml/h, nozzle to collector distance of 15 cm, and the collector rotating speed of 600 rpm. The structure of composite nanofibers was evaluated using SEM, TEM, FT-IR and UV-Vis techniques. The fabricated nanofibrous membrane was used for the adsorption of capsaicinoids. The maximum adsorption of capsaicinoids was obtained in about 30 minutes. The optimized nanofibrous membrane showed high efficiency 92-98% in adsorption of capsaicinoids.  These biocompatible, non-toxic nanofibrous membranes can be produced fast with low cost and they have high adsorption capacity for capsaicinoids. Thus, they can be used in protective clothing and respiratory masks.