Equilibrium and kinetic study of novel methyltrimethoxysilane magnetic titanium dioxide nanocomposite for methylene blue adsorption from aqueous media

• Published in: Applied organometallic chemistry Vol. 32; no. 6
• Main Authors: Alizadeh Eslami, Parvin, Kamboh, Mohammad Afzal, Rashidi Nodeh, Hamid, Wan Ibrahim, Wan Aini
• Format: Journal Article
• Language: English
• Published: Chichester Wiley Subscription Services, Inc 01.06.2018
• Subjects: Adsorbents; Adsorption; adsorption isotherm and kinetics; Chemistry; Dyes; Energy dispersive X ray spectroscopy; Fe3O4@TiO2 nanoparticles; Fe3O4@TiO2–methyltrimethoxysilane nanocomposite; Fourier transforms; Iron oxides; Magnetic measurement; Methylene blue; methylene blue dye; Nanocomposites; Regeneration; Scanning electron microscopy; Sol-gel processes; Spectrum analysis; Synthesis; Thermogravimetric analysis; Titanium; Titanium dioxide; X-ray diffraction
• ISSN: 0268-2605; 1099-0739
• DOI: 10.1002/aoc.4331

Novel magnetic titanium dioxide nanoparticles decorated with methyltrimethoxysilane (Fe3O4@TiO2‐MTMOS) were successfully fabricated via a sol–gel method at room temperature. The synthesized material was characterized using Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, thermogravimetric analysis and vibrating sample magnetometry. The removal efficiency of the adsorbent was evaluated through the adsorption of methylene blue (MB) dye from water samples. The adsorption isotherm and kinetics were evaluated using various models. The Langmuir model indicated a high adsorption capacity (11.5 mg g−1) of Fe3O4@TiO2‐MTMOS. The nanocomposite exhibited high removal efficiency (96%) and good regeneration (10 times) compared to Fe3O4 and Fe3O4@TiO2 at pH = 9.0. Based on the adsorption mechanism, electrostatic interaction plays a main role in adsorption since MB dye is cationic in nature at pH = 9, whereas the adsorbent acquired an anionic nature. The newly synthesized Fe3O4@TiO2‐MTMOS can be used as a promising material for efficient removal of MB dye from aqueous media. A newly synthesized magnetic nanocomposite (Fe3O4@TiO2‐MTMOS) as adsorbent was added into methylene blue (MB) dye solution and agitated for 5 min at pH = 9. Thereafter, residual concentration of MB was measured with UV–visible spectroscopy. High removal efficiency (96%) and good adsorption capacity (11.5 mg g‐1) were obtained for MB in aqueous solution using the novel Fe3O4@TiO2‐MTMOS.