Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
The paper present a new approach for the selective adsorption of xylene isomers from air smaple using nano materials base on oxidized cacbon nanotubes cartridges. | Vietnam Journal of Science and Technology 56 2A 2018 226-233 REMOVAL OF O M P-XYLENE FROM AIR SAMPLES ON OXIDIZED CARBON NANOTUBES CARTRIDGES Le Huu Quynh Anh Tran Duy Hai Phan Dinh Tuan Ho Chi Minh City University of Natural Resources and Environment 236 Le Van Sy Street Tan Binh District Ho Chi Minh City Email quynhanh. lehuu ạ ẹmaỉl. com Received 13 March 2018 Accepted for publication 15 May 2018 ABSTRACT Carbon nanotubes CNTs have been considered as an excellent adsorbent in environmental engineering especially for treatment of volatile organic compounds VOCs . The paper presents a new approach for the selective adsorption of Xylene isomers from air samples using nanomaterial based on oxidized multiwalled carbon nanotubes. In the first study the functionalization of two oxidized MWCNTs was achieved with hydrogen peroxide and sodium hypochlorite. The characterization of functionalized CNTs CNT-NaOCl CNT-H2O2 was performed by Fourier transform infrared spectroscopy FT-IR and X-Ray diffractometer XRD . Afterthat the applications of pristine CNTs and oxidized CNTs for removal of three Xylene isomers from air samples were discussed. The results demonstrate that the correlation of CNTs and three isomers was significantly different with an affinity order O-Xylene m-Xylene p-Xylene. The oxidized CNTs with carbonyl groups increased significantly its adsorption capacity for these isomers. A comparison in term of adsorption performance shows that the framework distinguishes among these adsorbents due to the dispersive properties and the electrostatic interaction between the Xylene isomers and oxidized CNTs surface. Keywords carbon nanotubes air pollution Xylene adsorption. 1. INTRODUCTION Xylene isomers i.e. p-xylene o-xylene and m-xylene are mainly produced from catalytic reforming process in petrochemical industries. These aromatic hydrocarbons have significant effects on the quality of the air pollution ground water and public health. Xylene isomers separation has .
