Extraction, characterization, and catalytic potential of amorphous silica from corn cobs by sol-gel method

Velmurugan, Palanivel; Shim, Jaesool; Lee, Kui-Jae; Cho, Min; Lim, Sung-Sik; Seo, Sang-Ki; Cho, Kwang-Min; Bang, Keuk-Soo; Oh, Byung‐Taek

doi:10.1016/j.jiec.2015.04.009

Cited by 100 publications

(46 citation statements)

References 26 publications

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“…Corncob contains cellulose 40 -45%, hemicellulose 30 -35% and lignin 10 -20% (Velmurugan et al, 2015). In 2009, Adesanya and Raheem reported while corncob ash contains more than 60% silica with a small percentage of metal elements.…”

Section: Introductionmentioning

confidence: 99%

Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

Wardhani

Nurlela

Azizah

2017

Molekul

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In this study, a simple method to obtain silica from corncob ash has been investigated using a nonthermal and thermal method. The Nonthermal method was done by various acid treatment with HCl, HBr and citric acid at room temperature. Thermal method was performed for HCl-leached, HBr-leached, and citric acid-leached corncob in the furnace at 750 ºC for 5 hours. Corncob ash was characterized by Energy Dispersive X-ray fluorescence spectroscopy (EDXRF), Fourier transforms infrared spectroscopy (FTIR), X-Ray diffraction (XRD), and Scanning electron microscope-electron dispersive X-ray (SEM-EDX). In this study silica content increase after acid treatment (leaching) and combustion at high temperatures. The result established that silica is most obtained with HCl treatment that is equal to 79,95% with lower metallic oxide impurity content. The FTIR spectra with different intensity shows silanol group at 1636 -1641 cm -1 , whereas siloxane group at 1037 -1106 cm , and 459-469 cm -1 . X-Ray diffractogram shows silica transition pf amorphous (2θ = 21 -25º) to quartz crystalline (2θ = 26.66º) phase. The surface morphology of silica that characterized with SEM-EDX shows amorphous and crystalline silica corresponds to XRD result. The high intensity spectra of Si and O in EDX shows the presence of silica in corncob ash.

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Section: Introductionmentioning

confidence: 99%

Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

Wardhani

Nurlela

Azizah

2017

Molekul

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“…Corn cobs are a major waste from corn/maize production and contain 30-35% hemicellulose, 40-45% cellulose, and 10-20% lignin [1,2]. As a low-cost lignocellulosic biomass, corn cobs are a reliable and renewable source for the production of various value-added products such as biofuel enzymes [3], proteins [4], fuels [5], absorbents [6], and cements [7].…”

Section: Introductionmentioning

confidence: 99%

Extraction and physical characterization of amorphous silica made from corn cob ash at variable pH conditions via sol gel processing

Shim

Velmurugan

2015

Journal of Industrial and Engineering Chemistry

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Herein, we disclose a novel approach for the synthesis of nano-silica using corn cob ash (CCA). Also, we identify that silica is stable at pH 7 and unstable at pH 10 at the critical salt concentration for monovalent NaOH. A zeta potential study was used to characterize the surface charge of nanoparticles. The silica nanoparticles were characterized by SEM-EDS, XRD, FTIR, TEM and XRD confirmed the crystalline nature and TEM images showed spherical silica nanoparticles. Brunauer-Emmett-Teller, cation exchange capacity, and N 2 analyses showed increased stability at pH 7. The CCA-mediated synthesized particles showed excellent stability at pH 7.

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“…` Silica from rice straw waste is not fully utilized until now. Most of the existing researches applied the silica derived from agricultural waste as a catalyst [12,13,14,15,16]. Therefore, this study aims to synthesize potassium silicate nanoparticles from rice straw waste using a flame-assisted spray-pyrolysis Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Potassium Silicate Nanoparticles from Rice Straw Ash Using a Flame-assisted Spray-pyrolysis Method

Nandiyanto

Permatasari

Sucahya

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The purpose of this study was to synthesize potassium silicate nanoparticles from rice straw ash using a flame-assisted spray-pyrolysis method. Rice straw, as one of the agricultural wastes, was used as a source of silica. In the experimental procedure, rice straw was burned at 700°C for 3 hours to produce rice straw ash. Then, the rice straw ash was extracted using an alkaline method. We used potassium hydroxide (KOH) as an alkaline chemical agent as well as a source of potassium. The solution was then put into the flame-assisted spray-pyrolysis apparatus to produce potassium silicate nanoparticles. The results showed that the spray method can assist the production of spherical potassium silicate nanoparticles with sizes of about 50 nm.

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Extraction, characterization, and catalytic potential of amorphous silica from corn cobs by sol-gel method

Cited by 100 publications

References 26 publications

Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

Extraction and physical characterization of amorphous silica made from corn cob ash at variable pH conditions via sol gel processing

Synthesis of Potassium Silicate Nanoparticles from Rice Straw Ash Using a Flame-assisted Spray-pyrolysis Method

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