title: Application of nanoporous silicas as adsorbents for chlorinated aromatic compounds. A comparative study.
abstract: The removal of two selected environmental pollutants such as 2,4-dichlorophenoxyacetic acid (2,4-D) and Triclosan (TC) was examined by adsorption experiments on the modified SBA-15 and MCF mesoporous silicas. Mesoporous adsorbents were modified by a grafting process with (3-aminopropyl)triethoxysilane (APTES) and 1-[3-(trimethoxysilyl)propyl]urea (TMSPU). Mesoporous materials were synthesized and characterized by N2 adsorption-desorption experiment, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), elemental analysis and adsorption studies. The results show that both APTES-functionalized SBA-15 and MCF nanoporous carriers are potentially good adsorbents for the removal of 2,4-D in a wide range of concentrations from 0.1 to 4 mg/cm(3). Maximum adsorption capacity of as-modified adsorbents for 2,4-D estimated from the Langmuir model was ~280 mg/g. The ionic interaction between the adsorbent and 2,4-D seems to play a key role in the adsorption process of the pollutant on APTES-modified siliceous matrices. The efficiency of TC sorption onto all prepared mesoporous adsorbents was significantly lower as compared to the entrapment of 2,4-D. Experimental data were best fitted by the Langmuir isotherm model. The results of this study suggest that mesoporous silica-based materials are promising adsorbents for the removal of selected organic pollutants.
authors.affiliation: Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemistry and Technical Electrochemistry, Piotrowo 3, 60-965 Poznań, Poland; Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89b, 61-614 Poznań, Poland. Electronic address: michal.moritz@put.poznan.pl.
authors.forename: Michał
authors.initials: M
authors.lastname: Moritz
authors.affiliation: NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland. Electronic address: Malgorzata.Geszke-Moritz@amu.edu.pl.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Geszke-Moritz
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000327:Adsorption; D007700:Kinetics; D058608:Nanopores; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013816:Thermodynamics; D014260:Triclosan / Q000737:chemistry*
chemical_list: C509969:SBA-15; D015084:2,4-Dichlorophenoxyacetic Acid; D014260:Triclosan; D012822:Silicon Dioxide
keywords: 2,4-Dichlorophenoxyacetic acid; Bioactive molecule adsorption; Mesoporous materials; Pollutant removal; Triclosan