tailieunhanh - Comparison of oxidized carbon nanotubes efficiencies for benzene and toluene removal from aqueous solution
In the first study, adsorption capacity of pristine MWCNTs to Benzene and Toluene in aqueous solution was investigated through isotherm study. The qe values of CNTs for Benzene and Toluene were 45,5 and , respectively and a contact time of 120 min. The modification of three oxidized MWCNTs were performed with acid solution (HNO3/H2SO4), hydrogen peroxide (H2O2) and sodium hypochlorite (NaOCl). | Vietnam Journal of Science and Technology 55 (4C) (2017) 311-318 COMPARISON OF OXIDIZED CARBON NANOTUBES EFFICIENCIES FOR BENZENE AND TOLUENE REMOVAL FROM AQUEOUS SOLUTION Le Huu Quynh Anh1, *,Tran Thu Kieu2,Tran Duy Hai1 1 HCMC University of Natural Resources and Environment, 236B Le Van Sy Street, Tan Binh District, HoChiMinh City 2 Industrial University of Hochiminh city, 12 Nguyen Van Bao, Go Vap, Ho Chi Minh City * Email: Received: July 15, 2017 ; Accepted for publication: 18 October 2017 ABSTRACT Carbon nanotubes (CNTs) have been widely used as adsorbent in environmental treatment, especially for pollutants and volatile organic compounds (VOCs). The purpose of this work is to develop materials based on functionalized multiwalled carbon nanotubes (MWCNTs) for Benzene and Toluene removal. This will exploit adsorption propertiesof modified MWCNTS for Benzene and Toluene. In the first study, adsorption capacity of pristine MWCNTs to Benzene and Toluene in aqueous solution was investigated through isotherm study. The qe values of CNTs for Benzene and Toluene were 45,5 and , respectively and a contact time of 120 min. The modification of three oxidized MWCNTs were performed with acid solution (HNO3/H2SO4), hydrogen peroxide (H2O2) and sodium hypochlorite (NaOCl). The modified MWCNTs materials (CNT-COOH,CNT-NaOCl,CNT-H2O2) were characterized by Fouriertransform infrared spectroscopy (FT-IR). The effects of functional groups on the MWCNTs on the adsorption capacity of Benzene, Toluene in aqueous solution were studied and compared to pristine MWCNTs. The results demonstrated that the efficiency of adsorption was significantly enhanced with oxidized CNTs, and following the order CNTs-NaOCl > CNTsH2O2 > CNTs-H2SO4 > pristine CNTs. Keywords:VOCs, carbon nanotubes, waste water treatment, oxidized carbon nanotubes, functionalization. 1. INTRODUCTION In recent years, industrialization has been associated with increased .
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