The immobilization of 3-(chloropropyl)triethoxysilane onto silica by a simple one-pot synthesis

Adam, Farook; Osman, Hasnah; Hello, Kasim Mohammed

doi:10.1016/j.jcis.2008.11.048

Cited by 131 publications

(68 citation statements)

References 20 publications

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“…The IR spectra recorded for NH 2 -CPG were compared with the IR spectra of unmodified CPG, and evidenced the success of the silanization step due to: (i) the same shift of the absorption bands due to the introduction of alkyl chains was observed as that reported elsewhere [33,34]; (ii) the presence of a new adsorption band, placed around 3133 cm…”

Section: Bioreactor Constructionsupporting

confidence: 66%

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor

Lates¹,

Marty²,

Popescu³

2010

Electroanalysis

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A new flow system for antioxidant capacity (AOC) estimation, consisting of a bioreactor, containing immobilized xanthine oxidase (XOD), coupled with a H 2 O 2 amperometric biosensor, based on Os-wired horseradish peroxidase, was developed. The H 2 O 2 , resulting from the enzymatic reaction between xanthine (XA) and XOD, was amperometrically monitored at À0.1 V vs. Ag/AgCl/KCl sat , in order to avoid the electrochemical interferences. Two protocols were used to perform the AOC evaluation: "steady-state", when the antioxidant (AOX) was injected in the XA flow, and "transient state", when XA and AOX were simultaneously injected in the carrier flow. The AOC of some commercial beverages were evaluated and compared with those obtained with 2,2-diphenyl-1-picrylhydrazyl radical and Folin-Ciocalteu methods.

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Section: Bioreactor Constructionsupporting

confidence: 66%

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor

Lates¹,

Marty²,

Popescu³

2010

Electroanalysis

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“…Functionalization of RHA with CPTES: According to the procedure described in the reference [14], 3 g of RHA was placed in 200 mL of 2 M NaOH in a plastic container at 75 °C for 60 min. The produced sodium silicate was filtered to get rid of the undissolived particles.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, the formed precipitate was grounded to produce a final powder. this sample was labeled as RHACCl [14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Mihsen¹,

Sobh²

2018

Asian J. Chem.

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Sodium silicate was prepared from rice husk ash (RHA), which then functionalized with 3-(chloropropyl)triethoxysilane via simple solgel technique to form RHACCl. The chloro group in RHACCl was replaced in iodo group to form RHACI. Thiourea was immobilized on RHACI to synthesize nanoheterogeneous catalyst labeled as RHATU-SO4H. The FT-IR analysis clearly indicated the presence of primary amine -NH2 and C-N absorption band. BET surface area measurement also showed that the surface area is 357 m 2 /g of catalyst with pore size distribution (2-20 nm) which falls within the mesoporous region. The elemental analysis has also proved the existence of nitrogen and sulfur in the structure of the catalyst. Upon application of RHATU-SO4H as a catalyst, the degradation of cellulose to glucose yields 81 % at 140 °C for 16 h. The synthesized catalyst is easy to synthesize, highly stable throughout hydrolysis of cellulose as well as reusability without loss of catalyst activity.Keywords: Rice husk ash, Thiourea, Hydrolysis of cellulose, Glucose.Asian Journal of Chemistry; Vol. 30, No. 5 (2018), 937-943 acid and ionic liquid [10]. Microorganism in nature is wellknown in the oroduction of soluble sugar, primarily cellobiose and glucose [11]. EXPERIMENTALSodium hydroxide (BHD, England 99%), nitric acid (CDH, India 70 %), 3-chloropropyltriethoxysilane (Sigma, Garmin 99 %), thiourea (Sigma, Germany 99%), toluene (GCC, England 98 %), DMSO (GCC, England 97 %), triethylamine (CDH, India 98 %), ethanol absolute (99 %), methanol (99 %), DMF (LOBA, Cheme 99.8%). All the chemicals used were of AR grade or a high purity and used directly without further purification.Extraction and modification of silica from RHA Source of silica: The RHA was chosen as an amorphous silica source, it is available in the profusion. The silica was extracted from rice husk as described in the literature [12,13].Functionalization of RHA with CPTES: According to the procedure described in the reference [14], 3 g of RHA was placed in 200 mL of 2 M NaOH in a plastic container at 75 °C for 60 min. The produced sodium silicate was filtered to get rid of the undissolived particles. A 6.0 mL solution of CPTES was added to the prepared sodium silicate solution. This solution was added dropwise (1.0 mL/min) to 3.0 M of nitric acid with constant stirred. The difference in pH was observed by using pH meter. A white gel started to form when

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“…The synthesis of silica was carried out according to literature [22,23]. Rice husk was washed with copious amount of water and rinsed with distilled water.…”

Section: Methodsmentioning

confidence: 99%

Heterogeneous para-phenylamino sulfonic acid ligand functionalized on MCM-41 derived from rice husk ash: Selective mono-alkylated products of tert-butylation of phenol

Adam

Kueh

2015

Applied Catalysis A: General

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The immobilization of 3-(chloropropyl)triethoxysilane onto silica by a simple one-pot synthesis

Cited by 131 publications

References 20 publications

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Heterogeneous para-phenylamino sulfonic acid ligand functionalized on MCM-41 derived from rice husk ash: Selective mono-alkylated products of tert-butylation of phenol

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The immobilization of 3-(chloropropyl)triethoxysilane onto silica by a simple one-pot synthesis

Cited by 131 publications

References 20 publications

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H2O2 Amperometric Biosensor

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H2O2 Amperometric Biosensor

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Heterogeneous para-phenylamino sulfonic acid ligand functionalized on MCM-41 derived from rice husk ash: Selective mono-alkylated products of tert-butylation of phenol

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Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor

Determination of Antioxidant Capacity by Using Xanthine Oxidase Bioreactor Coupled with Flow‐through H₂O₂ Amperometric Biosensor