Utilization of rice husk ash as silica source for the synthesis of mesoporous silicas and their application to CO2 adsorption through TREN/TEPA grafting

Bhagiyalakshmi, Margandan; Yun, Lee Ji; Anuradha, R.; Jang, Hee-Jin

doi:10.1016/j.jhazmat.2009.10.097

Cited by 211 publications

(123 citation statements)

References 44 publications

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“…6b) at -74 and -77 ppm respectively, indicating that two and three free silanols are involved during reaction between defective Si-OH groups of mesoporous silica and CPTMS. 13 Electrocatalytic reduction of hydrogen peroxide on Ag/SBA-15/TAEA and Ag/SBA-15/TEPA modified electrodes: Fig. 7 displays the electrocatalytic reduction of hydrogen peroxide on Ag/SBA-15/TAEA and Ag/SBA-15/TEPA working electrode by cyclic voltametry.…”

Section: Resultsmentioning

confidence: 99%

“…Then the mixture was refluxed at 353 K for 24 h and the final product was filtered, washed with toluene followed by alcohol and dried under vacuum at 343 K for 8 h. The product was denoted as SBA-15/ CPTMS. 13 1 mmol of amine compounds (TAEA / TEPA) was subsequent graftedon 1 g SBA-15/CPTMS by same procedure. Thereafter the products were named as SBA-15/X Amine (where X Amine is TAEA and TEPA).…”

Section: Methodsmentioning

confidence: 99%

“…[9][10][11][12] Recently, grafting of mesoporous silica with 3-chloropropyltrimethoxysilane (CPTMS) followed byother amines was recognized as a versatile route against the grafting of 3-aminopropyl trimethoxysilane, in order to plan desired number of amine groups. 13,14 In this context, the present work is proposed to synthesize mesoporous SBA-15 and grafting their Si-OH with CPTMS followed by amine grafting. The straight chain amine, tetraethylene pentamine (TEPA), and the branched amine, tris (2-aminoethyl) amine (TAEA), were chosen to graft secondary and primary amine group over chloro-functionalized mesoporous SBA-15.…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Vinoba¹,

Jeong²,

Bhagiyalakshmi³

et al. 2010

Bulletin of the Korean Chemical Society

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Mesoporous SBA-15 was synthesized using tetraethylorthosilicate (TEOS) as the silica source and Pluronic (P123) as the structure-directing agent. The defective Si-OH groups present in SBA-15 were successively grafted with 3-chloropropyltrimethoxysilane (CPTMS) followed by tris-(2-aminoethyl) amine (TAEA) and/or tetraethylenepentamine (TEPA) for effective immobilization of silver nanoparticles. Grafting of TAEA and/or TEPA amine and immobilization of silver nanoparticles inside the channels of SBA-15 was verified by XRD, TEM, IR and BET techniques. The silver nanoparticles immobilized on TAEA and /or TEPA grafted SBA-15 was subjected for electrocatalytic reduction of hydrogen peroxide (H2O2). The TEPA stabilized silver nanoparticles show higher efficiency for reduction of H2O2 than that of TAEA, due to higher number of secondary amine groups present in TEPA. The amperometric analysis indicated that both the Ag/SBA-15/TAEA and Ag/SBA-15/TEPA modified electrodes required lower over-potential and hence possess high sensitivity towards the detection of H2O2. The reduction peak currents were linearly related to hydrogen peroxide concentration in the range between 3 × 10 -4 M and 2.5 × 10 -3 M with correlation coefficient of 0.997 and detection limit was 3 × 10 -4 M.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Vinoba¹,

Jeong²,

Bhagiyalakshmi³

et al. 2010

Bulletin of the Korean Chemical Society

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“…So far, the only realized utilization of rice husk is by low technology applications such as in concrete, power plant and cattle feed. Nevertheless, more than 100 million tons/year of RH are produced globally, of which only a little part is effectively used [5]. Thus, implementation in terms of the use of raw materials will help minimize RH wastage.…”

Section: Introductionmentioning

confidence: 99%

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Salama¹,

Othman²

2016

Chem Sci J

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Zeolite Y in the sodium form (NaY) was synthesized using amorphous silica ash derived from waste rice husks under hydrothermal conditions. Structural characterization of NaY before and after modification with ZnO and ZnS has been done using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption-desorption at -196 °C, scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The effects of the Na 2 O/SiO 2 and Si/Al ratios, aging temperature and crystallization time on the optimized synthesis of NaY were thoroughly investigated. Thus the regulated Na + impurity concentration in the starting hydrogel was found to act as a template-assisted synthesis of zeolite NaY by the potential incorporation of Al atoms into the zeolite framework. Results of surface analyses indicate that the interactions of ZnO and ZnS with NaY zeolite are distinguishable and thus the higher interaction is observed for the latter. While Zn II has experienced electrostatic bonding interaction with the framework oxygen atoms, creation of mesopores in NaY due to local destruction of the zeolite lattice around the growing ZnS particles was evidenced. Wonderfully, ZnS/NaY exhibited a high performance in prohibiting the growth of Escherichia coli (E. coli) and negligible from P. Aeruginosa, and these important features make it a potential candidate as an antimicrobial agent for controlling implant-related infections.the utilization of silica from RH for the synthesis of various types of zeolite [8][9][10][11][12][13][14], and mesoporous silica such as . Efforts have also been made to use RH as a source of silica for the synthesis of NaY zeolite with the autoclave process. This low-cost process may lead to production of zeolite NaY to be economically able to compete with established commercial zeolite [16]. Zeolites could selectively adsorb biopolymers like protein, DNA, and RNA, and therefore could be used as chromatographic carriers for these molecules [17][18][19][20]. For these reasons, zeolites would be able to selectively adsorb microbial cells and could be used as cell separation carriers in their native state without surface modifications. Zeolites could adsorb each of the bacterial cell species with high selectivity even from a mixed suspension and could therefore be used as effective carrier materials to provide an easy, rapid and accurate method for cell separation [21]. Zinc oxide supported on zeolite with novel physicochemical properties has recently synthesized [22]. There are some reports regarding the industrial uses of ZnO/ zeolite [23][24][25]. This system can also provide significant impact on the design of a controlled-release product for the pharmacological application in alleviating post-weaning diarrhea of piglets.The aim of this research was to use the RH as an amorphous silica source in the synthesis of NaY zeolite under the optimized experimental conditions. The effects of gel aging and crystallization conditions for the synthesis of NaY under fully optimiz...

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“…Although the porous structure parameters and other FA mesoporous material properties are slightly inferior to commercial materials, yet they can be successfully used in many applications, e.g., as gaseous pollutant adsorbents. An example in this case may be the removal of CO 2 from flue gases [10,11]. It is of special importance due to the overall world tendency to restrict CO 2 emissions, which is one of the main causes of the greenhouse effect.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials

Majchrzak‐Kucęba

2011

J Therm Anal Calorim

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The thermogravimetry (TG) was used for characterization of the fly ash (FA)-based MCM-41 mesoporous materials. MCM-41 mesoporous materials were synthesized using silica extracts from different FA. The synthesis of MCM-41 from FA was carried out by the hydrothermal method using the supernatants of coal FA (in the form of sodium silicate) and cationic cetyltrimethylammonium bromide (CTAB) surfactants as the structuredirecting agents. On the basis of the data obtained from the TG analysis, thermal behaviour of FA-based MCM-41 mesoporous materials was assessed. This study has established the range of temperatures corresponding to the desorption of water, decomposition of the surfactant and condensation of silanol, thereby making the overall quality assessment of FA-based MCM-41 mesoporous materials.

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Utilization of rice husk ash as silica source for the synthesis of mesoporous silicas and their application to CO2 adsorption through TREN/TEPA grafting

Cited by 211 publications

References 44 publications

Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Electrocatalytic Reduction of Hydrogen Peroxide on Silver Nanoparticles Stabilized by Amine Grafted Mesoporous SBA-15

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials

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