The objective of the present study was arsenic removal from aqueous solutions by MCM-48 mesoporous silica functionalized by 3-Aminopropyl trimethoxysilane (APTMS) in batch system. This sorbent synthesized by sol-gel methods and its structural features were characterized by means of X-ray diffraction, nitrogen adsorption-desorption, thermogravimetric analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy. The effects of different independent variables including pH, initial As (V) concentration, sorbent dosage, contact time and temperature in adsorption were studied. The obtained results revealed that MCM-48 particles size exhibited from 400 to 500 nm with spherical morphology having a pore size about 2. 44 nm, specific surface areas 1326 m2. g-1 and total pores volume were 1. 11 cm3. g-1. The results of the As(V) adsorption by NH2-MCM-48 revealed that the optimum values for pH, initial As(V) concentration and sorbent dosage were found to be 2, 50 mg. L-1 and 1 g. L-1, respectively. In addition, Thermodynamic study indicated the endothermic behavior and spontaneous nature of adsorption. The study of the kinetics also showed that data from the experiments fitted well to pseudo-second order equation. On the other hand, Langmuir model better fitted with the experimental data among the two adsorption isotherm models used.

In this work we synthesized Nano hydroxyapatite (HAp) by Solgel method, Then we functionalized hydroxyapatite nanoparticle by use of 3-Aminopropyl trimethoxysilane (APTMS), to improve the loading and control release of sulfasalazine drug bonded to APTMS. The drug release patterns from Sulfasalazine loaded HAp nanoparticles at pH value 8 For 6h, Sulfasalazine loaded functionalized HAp nanoparticles (Sulfasalazine loaded HAp-APTMS) at pH value 8 as in the intestine for 48h. Moreover, the functionalized HAp showed relatively slower release rate of sulfasalazine compare with non functionalized HAp. because the strong ionic interaction between NH2 group in sulfasalazine in HAp-APTMS. On other side, the functionalized HAp loaded more drug than pure HAp. The synthesized nanoparticles and functionalized HAp characterized by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Fourier transform infrared (FT-IR) and UV/Vis analysis techniques. Then the obtained material was studied in the simulated body fluid (SBF) to this investigated storage and release properties.

The Fe3O4@SiO2@APTMS@Glu-His@V complex was prepared with modification of iron oxide magnetic nanoparticles with (3-aminopropyl) trimethoxysilane (APTMS) and glutaraldehyde-L-histidine Schiff base followed by complexation with VOSO4. Characterization of the Fe3O4@SiO2@APTMS@Glu-His@V complex was carried out by means of FTIR, XRD, SEM, EDX, TEM, AAS and VSM techniques. It was found that Fe3O4@SiO2@APTMS@Glu-His@V complex successfully catalyze the epoxidation of allyl alcohols with tert-butylhydroperoxide (TBHP) in moderate to high yields. The epoxidation of geraniol with 100 % conversion and 100% selectivity within 15 min is remarkable. Short reaction time, high activity, selectivity, stability, reusability and easily magnetic separation of the catalyst with no leaching during the course of reactions are some advantages of this research.

The composite-based poly (lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT)/kenaf fiber has been prepared using melt blending method. A PLA/PBAT blend with the ratio of 90:10 wt%, and the same blend ratio reinforced with various amounts of kenaf fiber have been prepared and characterized. However, the addition of kenaf fiber has reduced the mechanical properties sharply due to the poor interaction between the fiber and polymer matrix. Modification of the composite by (3-aminopropyl) trimethoxysilane (APTMS) showed improvements in mechanical properties, increasing up to 42.46, 62.71 and 22.00 % for tensile strength, flexural strength and impact strength, respectively. The composite treated with 2 % APTMS successfully exhibited optimum tensile strength (52.27 MPa), flexural strength (64.27 MPa) and impact strength (234.21 J/m). Morphological interpretation through scanning electron microscopy (SEM) reveals improved interaction and interfacial adhesion between PLA/PBAT blend and kenaf fiber. The fiber was well distributed and remained in the PLA/PBAT blend evenly. DMA results showed lower storage modulus (E′) for PLA/PBAT/kenaf fiber blend and an increase after modification by 2 wt% APTMS. Conversely, the relative damping properties decreased. Based on overall results, APTMS can be used as coupling agent for the composite since APTMS can improve the interaction between hydrophilic natural fibers and non-polar polymers.

In the present study, the loading and releasing of Diclofenac Sodium (DS) were investigated using a pH-sensitive magnetic nanocomposite hydrogel. The hydrogel was prepared through grafting copolymerization of Acrylic Acid (AA) and acrylamide (AAm) and using ammonium persulfate (APS) as a free radical initiator in the presence of Fe3O4@SiO2@ (3-Aminopropyl) trimethoxysilane (APTMS)@Maleic anhydride (MAN) as a cross-linker. The nanocomposite hydrogel structure (Fe3O4@SiO2@APTMS@MAN) was confirmed as the result of XRD, VSM, FT-IR, SEM, EDS, and TEM spectroscopy techniques. Furthermore, thermal properties were deliberated using TGA and DTG. The effects of different parameters such as pH, time, Fe3O4@SiO2@APTMS@MAN content, and salt solutions on swelling behavior were investigated considering the abovementioned outcomes. The adsorption isotherm was studied at 25°C using Langmuir, Freundlich, and Temkin. The adsorption data were well described by the Langmuir isotherm model. A kinetic study revealed the applicability of pseudo-first-order and pseudo-second-order models for the adsorption of mentioned DS. Moreover, the pH sensitivity of nanocomposite hydrogel and loading/releasing drugs were studied. Examining in vitro drug release in different buffer solutions indicated that the pH of the solution could mainly lead to the DS drug-releasing behavior of hydrogel. However, the cumulative release ratio of DS in pH: 7.4 solutions reached up to 93% within 120 min. Consequently, the investigated nanocomposite hydrogel of this study (Fe3O4@SiO2@APTMS@MAN) can be applied in widespread biomedical applications, particularly for controlled, targeted drug delivery purposes.

The scope of the present article is to study the effect of surface-functionalized SiO2 nanoparticles on the physical and mechanical properties of wheat straw flour reinforced by low-density polyethylene composites. The high hydrophilicity of nano-SiO2 originates from their amorphous structure and can induce the particles to be easily agglomerated and hardly dispersible in polymer matrix. Consequently, surface modification of SiO2 nanoparticles is the most effective way to vanquish these problems. Firstly, the SiO2 nanoparticles were modified by 3-aminopropyl-trimethoxysilane (APTMS), and then the wheat straw flour / low-density polyethylene composites containing different percentages of functionalized nano-SiO2 (0, 1, 2, 3 and 5%) were prepared via a melt compounding. Changes in the chemical structure of treated SiO2 were tracked by Fourier transform infrared (FTIR) spectroscopy. Field emission scanning electron microscopy (FESEM) was also investigated to study the distribution of SiO2 nanoparticles in the composites. Finally, the physical and mechanical properties (tensile strength, tensile modulus, bending strength, and bending modulus) of the nanocomposites were evaluated. The appearance of N–H bond at 695 cm−1 and aliphatic C–H bonds at 2841 cm−1 and 2947 cm−1 were indications of successful grafting of APTMS on the functionalized SiO2 nanoparticles. According to the results, using functionalized SiO2 nanoparticles as a reinforcing agent in wood plastic composites resulted in an increase in the tensile and bending strengths and a decrease in the water absorption of the composites.

In the present study, the tribological response of graphene (Gr)-epoxy nanocomposites was investigated. At the first step, the surface of Gr nanoplatelets was modified with 3-aminopropyltrimethoxy silane (3-APTMS), then the influence of silane modified Gr (SGr) loading (0, 0. 05, 0. 1, 0. 3 and 0. 5 wt. %) and surface functionalization on the tribological response of specimens was assessed. Approximately 40% and 68% decreases in coefficient of friction and wear rate of epoxy matrix, respectively, were observed at 0. 3 wt. % SGr loading. Also, the results revealed remarkable decreases of 28% and 48% in the coefficient of friction and wear rate of 0. 3 wt. % SGr loaded specimen compared to that specimen containing 0. 3 wt. % unmodified Gr. The possible mechanisms behind the reinforcing effects of Gr in the epoxy matrix were proposed.

In this work, superparamagnetic nanocomposite of Manganese ferrite was synthesized, using a co-precipitation method, and to prevent oxidation and increase of OH-functional groups on the surface, nanoparticles were reacted with tetra-orthosilicate and Silica coating was created on the surface of nanoparticles. In order to establish a chemical bond in subsequent reactions, the surface of the nanoparticles were covered and functionalized with 3-amino-propyltrimetoxycycline (APTMS). On the other hand, Multi-Walled Carbon NanoTubes (MWCNTs) with a diameter of 8 nm, increase the reactivity was reacted and functionalized with HNO3 Followed by thionyl chloride. Finally, the magnetic nanoparticles of manganese ferrite with an amine functional group are reacted with acylated MWCNTs. Magnetic nanoparticles were identified using FT-IR spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometers (VSM), X-Ray Diffraction (XRD) and Raman spectroscopy (RAMAN).

In this paper, structural, magnetic, optical, and photocatalytic properties of core-shell structure Fe3O4@GO nanoparticles have been compared with Fe3O4 nanoparticles in the degradation of methyl blue and methyl orange. For this purpose, GO nanosheets were wrapped around the APTMS-Fe3O4 nanoparticles and then characterized using X-ray Diffraction, field emission scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometer, UV-visible, and Fourier transform infrared spectroscopy. The results show the core-shell nanostructured Fe3O4@GO is formed. As an application for the synthesized structure, degradation of methyl blue and methyl orange as heavy-mass organic pollutants has been measured. While the saturation magnetization of Fe3O4@GO is lower than Fe3O4, but shows better efficiency in the degradation of methyl blue and methyl orange. The obtained catalysts can be quickly separated from the solution under an external magnetic field because of their considerable Ms values, which will be beneficial for their reuse and boosting the overall water treatment efficiency in practical applications.