جستجوی مقالات مرتبط با کلیدواژه « Air removal » در نشریات گروه « شیمی »

Luminescent graphene quantum dots(GQDs)and multi wall carbon nanotubes (MWCNTs) as photocatalytic sorbent based on was used for removal of toxic ethylbenzene from air in present of UV-radiation. A novel method based on solid gas removal (SGR) based on GQDs and MWCNTs as an efficient adsorbent was used for ethylbenzene removal from air in Robson quartz tubes (RGT). After synthesized and purified of GQDs and MWCNTs, a system was designed for generation of ethylbenzene in air with difference concentrations, and then the mixture was moved to quartz tubes with UV radiation in optimized conditions. The ethylbenzene in air was absorbed on the 25 mg of GQDs or MWCNTs, desorbed from sorbent at 146oC and determined by GC-FID. The main parameters such as, temperature, ethylbenzene concentration, amount of GQDs / MWCNTs and flow rate were studied and optimized. The recovery of ethylbenzene removal from air (more than 95%) and absorption capacity of adsorbent (186.4 mg g-1) were achieved in present of UV radiation at room temperature by GQDs. The flow rate and temperature were obtained at 300 mL min-1and less than 42 0C, respectively. Based on results, the special surface area and favorite porosity of GQDs caused to efficient removal of ethylbenzene from air in present of UV as compared to other carbon compounds such as MWCNTs, and graphene.Removal of ethylbenzene from air Baharak Bahrami Yarahmadi et alAnalytical Methods in Environmental Chemistry Journal Vol 2 (2019) 59-70

A new sorbent based on mixture of bismuth oxide-fullerene nanoparticles (Bi2O3-NF) was used for degradation/removal of toluene from workplace and artificial air by UV-photocatalytic oxidation method (UV-PCOM). By set up of pilot, standard gas of toluene was generated with difference concentrations, and then was passed through UV lamp-glass quartz cell accessory(UV-GQC) by SKC pump at optimized flow rate. Following the UV irradiation, the electrons and holes can undergo redox reactions with toluene on the Bi2O3 surface that lead to the formation of toluene intermediates and toluene. Toluene and intermediates was physically and radically absorbed on the 200 mg of NF at room temperature and then, desorbed from it at 185 OC before determined by GC/FID. In optimized conditions, the adsorption capacity and removal efficiency of NF were obtained 212 mg g-1 and more than 95%, respectively.