Functionalized mesoporous silica materials for dyes adsorption (original) (raw)
2021, Algerian Journal of Environmental Science and Technology
The mesoporous material silica MCM-41 was synthesized under basic media using pure silica, cetyltrimethylammonium bromide and tetramethylammonium hydroxide at 90°C, and then hydrothermally treated by dihexylamine (DHA) at 130°C for 72 h in order to inflate the pores. The post-synthesized material (DHA-41A), the material obtained after selective ethanol extraction of DHA (DHA-41B) and the organic-free material obtained after carbonization of DHA-41A and/or DHA-41B afford (DHA-41C). Small angle X-ray diffraction, nitrogen adsorption-desorption measurements, FT-IR, thermogravimetry and zetametrie were used to characterize all the samples. The samples were evaluated as adsorbent for two dyes Naphtol Green B (NGB) as anionic dye and Rhodamine B (RB) as cationic dye. DHA-41A and DHA-41C were found to be fast adsorbent for the anionic and the cationic dye respectively. Adsorption capacities of NGB onto DHA-41A and RB onto DHA-41C, were found 444.55 and 372.59 mg/g respectively. Adsorption kinetic data were tested using pseudo-first-order and pseudo-second-order models and intraparticle diffusion. Adsorption data were modeled using Langmuir, Freundlich and Sips adsorption isotherms. The result revealed that the adsorption of the anionic dye onto DHA-41A and the cationic dye onto DHA-41C, fitted very well with the Langmuir and Sips isotherm model naht Freundlich isotherm model.
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