Preparation of Mesoporous Silica from Rice Husk Ash: Effect of Depolymerizing Agents on Physico-Chemical Properties

The aim of this work was to prepare mesoporous silicas derived from rice husk ash (RHA) using three different depolymerizing agents; glycerol, 1,3 propanediol and 1,4 butanediol. The reaction of RHA with different depolymerizing agents was carried out between 200-250°C for 2 hrs. The solution was then hydrolyzed with deionized water to obtain gels. After a few washing step, gels were oven-dried and calcined at 500 °C for 24 hrs. Prepared mesoporous silicas were then characterized using Nitrogen adsorption-desorption measurement, FTIR, TGA, SEM, XRD and XRF. The percent hydrophobicity was determined based on the amount of moisture absorbed using TGA. It was shown that RHA reacted with depolymerizing agents above 200°C to form gels, which, after hydrolysis and calcination, still maintained the mesoporous characteristics. The BET and SEM results indicated that the RHA reacted with 1,3 propanediol had highest pore volume (0.95 cm3/g) and specific surface area (129.30 m2/g) compared to RHA reacted with glycerol and 1,4 butanediol. The distribution of pores computed from BJH desorption branch was also more uniform. FTIR indicated that there was no significant change in the chemical structure of RHA reacted with different depolymerizing agents. The residual C-H bands were found in FTIR spectra for all prepared mesoporous silicas. TGA thermograms confirmed the existence of organic residues (below 2 %wt), which might result from incomplete elimination even after calcination. This was found to be an important factor affecting the hydrophobic property of the reacted RHA. The hydrophobicity of RHA may be tailored by controlling depolymerizing agents and organic residues. Depolymerizing agents with longer carbon chains also favoured the hydrophobic characteristics.

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Synthesis of Nb/MCM-48 material using rice husk ash as silica source with different SI/NB molar ratios

Revista Perspectiva ◽

10.31512/persp.v.45.n.171.2021.159.p.85-95 ◽

2021 ◽

Vol 45 (171) ◽

pp. 85-95

Author(s):

Victor De Aguilar Pedott ◽

Iemedelais Bordin ◽

Carolina Elisa Demaman Oro ◽

Ricardo Jorge Macieski ◽

Diego Ivan Petkowicz ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Nitrogen Adsorption ◽

Structure Directing Agent ◽

Alternative Source ◽

Molar Ratios ◽

Silica Source ◽

In Situ Deposition ◽

Adsorption Desorption

The large amount of rice produced in Brazil generates a large volume of co-products, such as, Rice Husk (RH) and Rice Husk Ash (RHA). These co-products have amounts of silicon (Si) present in their structure, which can be used to synthesize silica-based materials as zeolites and MCM-type structures. The synthesis of MCM-48 material was carried out at room temperature, using the ionic liquid [C16MI·Cl] as structure-directing agent, depositing the niobium in situ during the synthesis with different molar ratios of Si/Nb (5, 20, 50 and 80). The material obtained was subjected to characterization by X-Ray Diffraction (XRD), Nitrogen Adsorption/Desorption isotherms and Scanning Electron Microscopy (SEM). The results confirm the formation of Nb/MCM-48 materials, in which their properties are consistent with those described in the literature. The deposition of Nb on MCM-48 did not change its structural properties, such as specific surface area and pore distribution for Si/Nb higher than 5. The results obtained demonstrate the success in the synthesis of mesoporous materials Nb/MCM-48 using industrial residues of rice as an alternative source of silicon, and in situ deposition of the niobium metal on the structure.

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The mutagenic and some physico-chemical properties of organic residues obtained from drinking water by Amberlite XAD-2 and activated carbon extraction.

Eisei kagaku ◽

10.1248/jhs1956.34.389 ◽

1988 ◽

Vol 34 (5) ◽

pp. 389-400 ◽

Cited By ~ 7

Author(s):

SUKEO ONODERA ◽

KEIICHIRO YOSHIMATSU ◽

SEIGO NAKANO ◽

HISAYO SAITOH ◽

SHIZUO SUZUKI

Keyword(s):

Drinking Water ◽

Activated Carbon ◽

Chemical Properties ◽

Organic Residues ◽

Physico Chemical

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Physical and chemical properties of cement with nano black rice husk ash

10.1063/1.5124654 ◽

2019 ◽

Cited By ~ 1

Author(s):

Ramadhansyah Putra Jaya ◽

Mohd Ibrahim Mohd Yusak ◽

Mohd Rosli Hainin ◽

Nordiana Mashros ◽

Muhammad Naqiuddin Mohd Warid ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Black Rice ◽

Physical And Chemical ◽

And Chemical Properties

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Rapid Synthesis of MCM-41 from Rice Husk Using Ultrasonic Wave: Optimation of Sonication Time

Materials Science Forum ◽

10.4028/www.scientific.net/msf.948.198 ◽

2019 ◽

Vol 948 ◽

pp. 198-205

Author(s):

Suyanta Suyanta ◽

Eko Sri Kunarti ◽

Bambang Rusdiarso ◽

Dritta Anies Cahaya ◽

Efa Radnawati ◽

...

Keyword(s):

Optimum Condition ◽

Ultrasonic Wave ◽

Rice Husk ◽

Nitrogen Adsorption ◽

Sonication Time ◽

Ultrasound Waves ◽

Comb Structure ◽

Silica Source ◽

Adsorption Desorption ◽

Mcm 41

Ultrasound waves with 48 KHz of frequency were applied for the synthesis of MCM-41 using rice husk as the silica source. The effect of sonication time (30, 60, 90, 120, 150, 180, and 210 min) on the crystallinity of calcined MCM-41 was investigated. Characterization using XRD and FTIR indicated that the ordered structure of MCM-41 could be synthesized by ultrasonic wave. Sonication time at 150 min was found to be the optimum condition. The nitrogen adsorption-desorption isotherms informed that the mesoporous material produced at the optimum condition has 794.73 m2·g-1of surface area, 3.02 nm of BJH pore diameter, 1.17 nm of wall thickness, and 0.68 ml·g-1 of pore volume. While based on the TEM image, the material has hexagonal or a honey-comb structure.

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Hydrothermal Synthesis of TiO2/SiO2 Hybrid Photocatalyst from Rice Husk Ash

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.352.281 ◽

2007 ◽

Vol 352 ◽

pp. 281-285 ◽

Cited By ~ 2

Author(s):

P. Sujaridworakun ◽

Supatra Jinawath ◽

W. Panpa ◽

Akira Nakajima ◽

Masahiro Yoshimura

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Uv Light ◽

Porous Silica ◽

Chemical Properties ◽

Nano Crystalline ◽

Ultraviolet Ray ◽

Physical And Chemical ◽

Hydrolysis Of ◽

Fine Tio2

Photocatalyst materials were prepared as a hybrid between TiO2 /SiO2 via low temperature hydrothermal method (150oC) without further heat treatment. Porous silica from rice husk ash was used as a support for fine TiO2 particles which acted as a photocatalyst when radiated with a UV light. TiO2-deposited SiO2 was successfully prepared through hydrolysis of TiOSO4 solution by controlling synthesis parameters such as pH ,concentration of TiOSO4, temperature and time under hydrothermal treatment. The obtained products were characterized for physical and chemical properties by means of XRD, XRF, BET and TEM . It was found that pH had an influence on the crystallization of TiO2, and under an appropriated pH, only anatase presented along with amorphous phase. High crystallinity of nano-crystalline anatase ( about 5 nm) deposited on silica surface was observed through TEM. Adsorption and photocatalytic performances of the prepared catalyst were evaluated in methylene blue aqueous solution in the dark and under ultraviolet ray irradiation, respectively. Due to the synergetic functions of adsorption by porous substrate and decomposition by TiO2 photocatalyst, an enhancing of photocatalytic activity for decomposition of organic pollutants in water under UV rays was obtained.

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Development of Geopolymer Mortar from Metakaolin Blended with Agricultural and Industrial Wastes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.766.305 ◽

2018 ◽

Vol 766 ◽

pp. 305-310 ◽

Cited By ~ 1

Author(s):

Chayanee Tippayasam ◽

Sarochapat Sutikulsombat ◽

Jamjuree Paramee ◽

Cristina Leonelli ◽

Duangrudee Chaysuwan

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

Chemical Properties ◽

Cement Industry ◽

Industrial Wastes ◽

Engineering Properties ◽

Alkali Solutions ◽

Physical And Chemical

Geopolymer is a greener alternative cement produced from the reaction of pozzolans and strong alkali solutions. Generally, the cement industry is one of largest producers of CO2that caused global warming. For geopolymer mortar usage, Portland cement is not utilized at all. In this research, geopolymer mortars were prepared by mixing metakaolin, various wastes (fly ash, bagasse ash and rice husk ash) varied as 80:20, 50:50 and 20:80, 15M NaOH, Na2SiO3and sand. The influence of various parameters such as metakaolin to ashes ratios and pozzolans to alkali ratios on engineering properties of metakaolin blended wastes geopolymer mortar were studied. Compressive strength tests were carried out on 25 x 25 x 25 mm3cube geopolymer mortar specimens at 7, 14, 21, 28 and 91 air curing days. Physical and chemical properties were also investigated at the same times. The test results revealed that the highest compressive strength was 20% metakaolin - 80% fly ash geopolymer mortar. When the curing times increases, the compressive strength of geopolymer mortar also increases. The mixing of metakaolin and bagasse ash/rice husk ash presented lower compressive strength but higher water absorption and porosity. For FTIR results, Si-O, Al-O and Si-O-Na+were found. Moreover, the geopolymer mortar could easily plastered on the wall.

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Adsorption of Cobalt Ions on Molded Magnesium Silicate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.704 ◽

2013 ◽

Vol 807-809 ◽

pp. 704-707

Author(s):

Li Li Mao ◽

Hai Zeng Wang ◽

Qing Wang

Keyword(s):

Adsorption Process ◽

Average Pore Size ◽

Chemical Properties ◽

Magnesium Silicate ◽

Average Pore ◽

Cobalt Ions ◽

Adsorption Time ◽

Physico Chemical ◽

Adsorption Desorption ◽

Adsorbent Dose

The groundwater contaminated with cobalt is attracted more and more concern. In this study, molded magnesium silicate (MMS) was successfully prepared and the physico-chemical properties were determined by N2 adsorption/desorption isotherm and Scanning Electron Microscopy (SEM). Surface area and the average pore size were 333.19 m2·g-1 and 4.442 nm. Adsorption experiments of removal of cobalt ions was investigated as the function of initial concentration, adsorbent dose and adsorption time. Adsorption process was rapid and adsorption equilibriums were achieved soon.

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Influence of Rice Husk Ash and Fly Ash on Properties of Red Clay

Journal of Scientific Research ◽

10.3329/jsr.v6i3.15343 ◽

2014 ◽

Vol 6 (3) ◽

pp. 421-430 ◽

Cited By ~ 8

Author(s):

M.S. Sultana ◽

M.I. Hossain ◽

M.A. Rahman ◽

M.H. Khan

Keyword(s):

Fly Ash ◽

Water Absorption ◽

Rice Husk ◽

Rice Husk Ash ◽

Chemical Properties ◽

Xrd Analysis ◽

Linear Shrinkage ◽

Red Clay ◽

Clay Deposits ◽

Percentage Of Water Absorption

Effects of rice husk ash and fly ash on properties of red clay collected from Naogaon district of Bangladesh were investigated. Different percentages of rice husk ash (RHA) and fly ash (5%, 10% and 15%) were thoroughly mixed with clay to analyse various physical and chemical properties of clay followed by heat treatment of 8000C to 11000C. The samples were tested for compressive strength, linear shrinkage, water absorption, porosity and bulk density. XRD analysis indicates the clay sample was mainly illite type. Water absorption and porosity increased with increasing percentage of ashes. The percentage of water absorption was within 6 to 10% for different mixture which may be suitable for ceramic and tiles purposes. Both fly ash and RHA of 15% could be used to improve some properties of clay. The optimum firing temperature for all the samples was 10500C. XRD pattern of clay with fly ash and rice husk ash heated at 10500C confirms the presence of feldspar and quartz as major phase and hematite (Fe2O3) and cristobalite phase as minor phase. This red clay deposits reinforced with different appropriate quantities of rice husk ash and fly ash could be used for various low temperature applications in industry and construction purposes. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i3.15343 J. Sci. Res. 6 (3), 421-430 (2014)

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