Tunable mesoporosity and hydrophobicity of natural rubber/hexagonal mesoporous silica nanocomposites

Nuntang, Sakdinun; Yousatit, Satit; Yokoi, Toshiyuki; Ngamcharussrivichai, Chawalit

doi:10.1016/j.micromeso.2018.09.004

Cited by 16 publications

(28 citation statements)

References 50 publications

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“…In addition, the representative Transmission electron microscopy (TEM) image of this MCS sample (Fig. 5e) showed conventional uniform wormhole-like mesopores, as observed for HMS materials [16][17][18] .…”

Section: Structural and Textural Properties Of Mcs Materialsmentioning

confidence: 58%

“…The ratio of Q 2 :Q 3 :Q 4 species of HMS, NR/HMS, and MCS were 1:7.5:33, 1:11:21, and 1:6.4:36, respectively. The presence of rubber incorporated into the HMS structure enhanced the wall thickness ( W t ) of NR/HMS (Table 1 ) but hampered the hexagonal ordering of mesoporous structure 16 – 18 . Moreover, the higher content of isolated silanol sites (Q 3 ) in NR/HMS than in HMS indicated that rubber molecules present in the synthesis mixture lowered the degree of silicate condensation 17 .…”

Section: Resultsmentioning

confidence: 99%

“…Mesoporous nanocomposites comprised of natural rubber (NR), as a hydrophobicity improver, dispersed in the wormhole-like mesostructure of hexagonal mesoporous silica (HMS) have been previously synthesized by an in situ sol–gel process using dodecylamine (DDA) as organic template 16 – 18 . The NR/HMS materials exhibited good structural and textural properties (high specific surface area and large pore volume) owing to the well-dispersed rubber phase in mesostructured silica 16 .…”

Section: Introductionmentioning

confidence: 99%

“…The NR/HMS materials exhibited good structural and textural properties (high specific surface area and large pore volume) owing to the well-dispersed rubber phase in mesostructured silica 16 . Recently, it has been reported that the mesoporosity and hydrophobicity of NR/HMS materials can be systematically controlled by altering the hydrocarbon chain length of amine templates 18 . The surface silanol groups remaining on the silica phase allowed nanocomposites to be modified with different types of chemically active functional groups to prepare hydrophobic mesoporous materials for adsorption 19 and catalysis 20 , 21 .…”

Section: Introductionmentioning

confidence: 99%

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Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

Yousatit

Pitayachinchot

Wijitrat

et al. 2020

Sci Rep

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This study is the first report on the preparation of mesoporous carbon/silica (MCS) nanocomposites with tunable mesoporosity and hydrophobicity using natural rubber (NR) as a renewable and cheap carbon source. A series of mesoporous nanocomposites based on NR and hexagonal mesoporous silica (HMS) were prepared via an in situ sol-gel process and used as precursors; then, they were converted into MCS materials by controlled carbonization. The NR/HMS precursors exhibited a high dispersion of rubber phase incorporated into the mesostructured silica framework as confirmed by small-angle X-ray scattering and high-resolution transmission electron microscopy. An increase in the carbonization temperature up to 700 °C resulted in MCS nanocomposites with a well-ordered mesostructure and uniform framework-confined wormhole-like channels. The NR/HMS nanocomposites possessed high specific surface area (500-675 m 2 g −1) and large pore volume (1.14-1.44 cm 3 g −1). The carbon content of MCS (3.0-16.1 wt%) was increased with an increase in the H 2 So 4 concentration. Raman spectroscopy and X-ray photoelectron spectroscopy revealed the high dispersion of graphene oxidelike carbonaceous moieties in MCS materials; the type and amount of oxygen-containing groups in obtained MCS materials were determined by H 2 So 4 concentration. The enhanced hydrophobicity of MCS nanocomposites was related to the carbon content and the depletion of surface silanol groups, as confirmed by the water sorption measurement. The study on the controlled release of diclofenac in simulated gastrointestinal environment suggests a potential application of MCS materials as drug carriers. Mesoporous carbon/silica nanocomposites (MCS) have received considerable attention in catalysis 1 , adsorption 2 , energy storage 3,4 , and drug delivery 5 owing to the combined advantages of inorganic silica and organic carbon in their mesostructure. Silica framework provides high mesoporosity, specific surface area, and thermal/mechanical stability. Due to the high density of silanol groups, the silica surface can be simply modified by either direct co-condensation or postsynthesis grafting to acquire various chemically active functionalities to serve a wide range of applications 6,7. However, amorphous carbon is characterized by its tunable physicochemical properties by controlling the ratio of sp 2 /sp 3 bonds and quantity of heteroatoms (i.e., oxygen) 8,9. The oxygen-containing functional groups on the carbon surface provide acidic (i.e., carboxyl, lactone, and phenol) and basic (i.e., pyrone, chromene, ether, and carbonyl) properties 10. An increase in the amount of sp 2-hybridized carbon transforms amorphous carbon into graphite-like carbon with enhanced textural properties and chemical reactivity 11,12. Typically, the preparation of MCS materials consists of two steps. The first step is to introduce an organic substance (e.g., glucose, furfuryl alcohol, phenol, and formaldehyde) as a carbon source into mesostructured silica. Then, the organic substance is converted to ...

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Section: Structural and Textural Properties Of Mcs Materialsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

Yousatit

Pitayachinchot

Wijitrat

et al. 2020

Sci Rep

Self Cite

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“…The HMS also has other brilliant advantages that are interesting for this research, such as non-toxicity, low cost, reusability, stability to heat, smaller domain size, and interconnection between its channels. Various excellent performance of the HMS has been proved before, such as catalyst, drug carrier, sensor, and adsorbent [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

et al. 2021

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This study aimed to develop non-metal elements for doping carbon quantum dots (CQDs) with nitrogen and sulfur (N, S-CQDs), which loaded inside hexagonal mesoporous silica (HMS) in order to effectively remove methylene blue dye (MB) from an aqueous solution. The histidine and cysteine amino acids were used as the source for synthesis N, S-CQDs through the hydrothermal method. Morphology and structure of the N, S-CQDs, and adsorbent (N, S-CQDs/HMS) were characterized by using different microscopic and spectroscopic techniques. The adsorption parameters such as adsorbent dosage (0.25–1 g/L), pH (2–10), contact time (15–75 min), and initial MB dye concentration (20–300 mg/L) were investigated. The maximum adsorption capacity and removal efficiency of MB were determined at 370.4 mg/g and 97%, respectively, under optimum conditions at 303 K. The adsorption isotherm studies were fitted with the Freundlich isotherm equation, and the dye removal kinetics of the adsorbent followed the pseudo-second-order model. Thermodynamic studies showed that the adsorption process had exothermic and spontaneous behavior. The removal of MB next to the Rhodamine B and Reactive Black 5 dyes indicated that the N, S-CQDs/HMS had excellent selective behavior for MB absorption. This prepared adsorbent could be well recycled with suitable activity after four repeated adsorption–desorption cycles. Results revealed that the porous characters, surface area, charge properties, reduction in the bandgap, and quantum yield of the N, S-CQDs/HMS were essential factors that affected dye adsorption.

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Hydrocracking of Waste Cooking Oil into Biofuel Using Mesoporous Silica from Parangtritis Beach Sand Synthesized with Sonochemistry

Salamah

Trisunaryanti

Kartini

et al. 2021

Silicon

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Tunable mesoporosity and hydrophobicity of natural rubber/hexagonal mesoporous silica nanocomposites

Cited by 16 publications

References 50 publications

Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

Hydrocracking of Waste Cooking Oil into Biofuel Using Mesoporous Silica from Parangtritis Beach Sand Synthesized with Sonochemistry

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