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New Polysiloxane Surfaces Modified with <i>ortho-, meta-</i>or <i>para</i>-Nitrophenyl Receptors for Copper Adsorption

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Journal of Surface Engineered Materials and Advanced Technology 2014年第1期4卷 21-28页

作者： smaail radi Nouraddine Basbas Said Tighadouini Maryse Bacquet LCAE Faculté des Sciences Université Med I Oujda Morocco LCAE Faculté des Sciences Université Med I Oujda Morocco Centre de l’Oriental des Sciences et Technologies de l’Eau (COSTE) Université Mohamed I Oujda Morocco Université des Sciences et Technologies de Lille UMET: Unité Matériaux et Transformations UMR8207 Equipe Ingénierie des Systèmes Polymères Villeneuve d’Ascq France

Porous SiO2 has been chemically modified with functional ortho-, meta- or para-nitrophenyl moieties using the heterogeneous route. This synthetic route involved the reaction of carbaldehyde derivatives with 3-aminopropyl trimethoxysilane prior to immobilization on the support. The new modified surfaces have been characterized by elemental analysis, FT-IR, 13C NMR of the solid state, nitrogen adsorption-desorption isotherm, BET surface area, B.J.H. Pore sizes, thermogravimetry curves (TGA) and scanning electron microscope (SEM). The new materials exhibit good chemical and thermal stability. These products were employed as a Cu(II) adsorbent from aqueous solutions at room temperature using the batch technique. Flame atomic absorption spectrometry was used to determine the Cu(II) concentration in the filtrate after the adsorption process. The results indicate that under the optimum conditions, the maximum adsorption value for Cu(II) was 20.0 mg Cu(II) g-1 modified silica, whereas the adsorption capacity of the unmodified silica was only 1.0 mg Cu(II) g-1 silica. On the basis of these results, it can be concluded that it is possible to modify chemically SiO2 with functional groups and use it as adsorbents for metals in aqueous media.

关键词： Modified Surfaces Chemical Synthesis Characterization Adsorption Cu(II)

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New Polysiloxane Surfaces Modified with Ortho-, Meta-, or Para-Nitrophenyl Moieties for Cadmium Removal from Water

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Journal of Surface Engineered Materials and Advanced Technology 2016年第2期6卷 18-35页

作者： Shehdeh Jodeh Bayan Khalaf smaail radi Said Tighadouini Rachid Salghi Sobhi Samhan Ismail Warad Diana Jodeh Department of Chemistry An-Najah National University Nablus Palestine Laboratoire de Chimie Appliquée et Environnement Oujda Morocco Laboratory of Materials and Environment University Ibn Zohr Agadir Morocco Palestine Authority of Water Ramallah Palestine Department of Medicine An-Najah National University Nablus Palestine

This study aims to prepare and develop several vehicles chelation polydentate supported ligands and then installed it using sol-gel or polymerization or to be susceptible to imply conjunction with the highly toxic heavy metal ions in the water, and disrupted the underground water used for drinking or agriculture, including cadmium ions. As the process of interaction between ligands and heavy metals depends on the circumstances of surrounding conditions which are treated in this research. Metal ion uptake through complexation or hydrogels can be affected by hydrophilic-hydrophobic balance, the nature of chelate ligands and the extent of cross-linking of macromolecular supports. Ligand function also dictates reactivity, complexation ability and efficiency of polymer supported ligands in the present case expected to be good solution for such problem. This research involves the synthesis and characterization of new polysiloxane surfaces modified with ortho-, meta-, or para-nitrophenyl moieties. The resulting adsorbents have been characterized by SEM, IR, UV, 13C solid state NMR, BET surface area, B.J.H. pore sizes, TGA and nitrogen adsorption-desorption isotherm. These porous materials showed a very good thermal and chemical stability and hence they can be used as perfect adsorbents to uptake toxic heavy metal ions including Cd(II) from groundwater. The concentrations of each adsorbate in the filtrate were determined using Atomic Absorption Spectrophotometer. The results showed that all of the three resulting products had high adsorption efficiency. Also, it showed strong complexation properties with heavy metal ions.

关键词： Groundwater Adsorption Isotherm Desorption Heavy Metals Kinetics

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