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

Abstract

Novel magnetic titanium dioxide nanoparticles decorated with methyltrimethoxysilane (Fe 3 O 4 @TiO 2 -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 Fe 3 O 4 @TiO 2 -MTMOS. The nanocomposite exhibited high removal efficiency (96%) and good regeneration (10 times) compared to Fe 3 O 4 and Fe 3 O 4 @TiO 2 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 Fe 3 O 4 @TiO 2 -MTMOS can be used as a promising material for efficient removal of MB dye from aqueous media.KEYWORDS adsorption isotherm and kinetics, Fe 3 O 4 @TiO 2 nanoparticles, Fe 3 O 4 @TiO 2 -methyltrimethoxysilane nanocomposite, methylene blue dye

Photoinduced electron transfer reaction for synthesis of tetrahydroquinoline derivatives with conjugated structure using chlorophyll b‐modified magnetic titanium dioxide photocatalyst

“…The first step was ascribed to the loss of the adsorbed water (physically) occurring in the ranges of 25–285°C. The second mass change (about 7% to 8%) in the TGA spectra of Ch b ‐modified photocatalyst was observed by rising temperatures up to 500°C, which can be corresponded to the decomposition of organic compounds 21,54 …”

“…Furthermore, the absorption band at 1090 and 1182 cm −1 was assigned to the asymmetric vibration of SiOSi (Figure 1b). 54 The characteristic peaks of TiOTi and SiOTi vibration bonds observed at 637 and 920 cm −1 in the FT‐IR spectrum of Fe 3 O 4 /SiO 2 /TiO 2 , respectively (Figure 1c). 53,55 The coupling between APTES and magnetic titanium dioxide was proven with the appearance of CH aliphatic bands at 2887 cm −1 and 2931 cm −1 , as well as the peak observed at 1326 cm −1 which was attributed to the CN bond (Figure 1d).…”

Nickel-hydroxide-encapsulated polyacrylamide as a novel adsorptive composite for the capture of methylene blue from wastewater

“…Numerous interaction mechanisms could take place during the MB adsorption process, for instance: surface complexation, mesopore filling, H-bond formation, and n-π and π-π interactions (also known as π-π electron donor-acceptor interaction or π-π dispersion interaction). [52][53][54][55][56][57] Methylene blue is a cationic dye (pK a = 3.14). 47 This indicates that the main MB species at pH > 3.14 will be positive ions.…”

Equilibrium, kinetic, and thermodynamic studies of new materials based on xanthan gum and cobalt ferrite for dye adsorption

“…[7,8] New methods and systems have been developed in order to reduce some pollution problems caused by organic dyes. The most thoroughly explored techniques for wastewater treatment include adsorption, [9,10] oxidation, [11] chemical coagulation, [12] and biodegradation. [13] The adsorption process is considered to be one of the most efficient methods, being cost-effective and relatively fast, as compared to the other techniques.…”