Synthesis and characterization of mesoporous silica nanoparticles (MSNp) MCM 41 from natural waste rice husk

Abstract

Rice husk contains silica up to 86.9-97.3%, it potentially as precursor silica in the synthesis process of mesoporous silica MCM 41. First, use acid leaching as pre-treatment of rice husk extraction, followed by heat treatment at 600°C in the furnace, continued with sol-gel process to get amorphous silica. Mesoporous silica was synthesizing using CTAB as surfactant to assist porous of silica MCM 41 (CTAB-templated silica). CTAB concentration were 1, 1.25 and 1.5%. Mesoporous silica nanoparticle MCM 41 synthesized by sol-gel method, followed by hydrothermal and reflux methanol + HCl. X-ray diffraction pattern showed that silica has amorphous liked-structure, indicated by peak broadening at 2-theta around 22-24°. Fourier Transformed Infrared-FTIR shown functional group of Si-O, Si-O-H, Si-O-Si, -OH, Si-H, and Si-OH bond have been identified. Scanning electron microscope (SEM) shown particle agglomeration and particle sizes range between 311-482 nm. The desorption adsorption nitrogen analysis (BET analysis) showed that surface area and pore diameter at 1%, 1.25% and 1.5% CTAB have surface area 552.429 m2/g, 768.947 m2/g and 705.501 m2/g. In hence pore diameters are 3.4178 nm, 3.0517 nm and 3.4098 nm respectively.

Effect of Calcination Temperature on the Synthesis of Silica from Bagasse

“…Similar results were obtained in the silica obtained from rice husk ash, where the surface area at a calcination temperature of 700℃ was more significant than 800℃ [31]. Synthesis of mesoporous silica from rice husk with a calcination temperature of 600℃ using a 1.25% Cetyl trimethyl ammonium bromide template produced an amorphous silica phase and a surface area of 768.947 m 2 /g [32]. The surface area is smaller than the results of this study, namely 796.89 cm 2 /g.…”

Engineering Mesoporous Silica Nanoparticles for Targeted Alpha Therapy against Breast Cancer

“…Multifunctional MSNPs displaying cancer-targeting vectors, chelating molecules, and stabilizing agents were obtained using a multistep functionalization protocol (Scheme ). We selected 140 nm spherical MSNPs (Figure a,b) as nanoconstruct cores because they are widely used as delivery vehicles in nanomedicine. , The synthesized nanoparticles had a hierarchical structure (Figure S1, Supporting Information) with pore diameters of 3.2 ± 0.6 nm and a characteristic X-ray diffraction peak (2θ) at 23° (Figure S2), which were consistent with previous literature results. − The MSNP surface was then sequentially modified with adamantanyl- and epoxy-containing molecules (Figure c), acting as anchoring points for stabilizing and targeting agents, respectively.…”

Recent Progress on the Development of Engineered Silica Particles Derived from Rice Husk

“…Sodium silicate solution was added to the surfactant mixture (CTAB and LE-4) dissolved in an aqueous solution at 80 • C. Then, the mixed solution was titrated using acetic acid until the pH reached 10, and heated at 100 • C for 48 h. After filtration and washing, the final product was obtained by calcination at 550 • C. The obtained MCM-48 silica showed a bicontinuous I a3d cubic phase with a surface area of 1124 m 2 g −1 and a main pore size of 3.9 nm. Morphological properties, such as the surface area, pore volume, and main pore size of the rice husk-derived MCM-41 and MCM-48 silica reported to date are summarized in Table 1 [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95]. SBA-15 is one of the most common types of mesoporous silica and was first developed at the University of California [96].…”