scholarly journals Synthesis, characterization of Silica Obtained from Rice Husk and Determination its Silica Content by Modified Volumetric Method

2016 ◽  
Vol 11 (2) ◽  
pp. 93 ◽  
Author(s):  
Nijhuma Kayal ◽  
Nahar Singh
Keyword(s):  
Heat Treatment ◽  
Surface Area ◽  
Rice Husk ◽  
High Surface ◽  
High Surface Area ◽  
Atomic Emission ◽  
Silica Content ◽  
Volumetric Method ◽  
Trace Impurities ◽  
Pure Silica

<p>The objective of the work was to develop pure silica with high surface area from rice husk by chemical and heat treatment. The silica samples were characterized in terms of chemical composition, particle size distribution, morphology and surface area. The amount of silica was determined by a modified volumetric method. The trace impurities in silica were quantitatively determined by inductive coupled plasma atomic emission spectroscopy (ICP-AES). A 99% silica powder with surface area 282 m<sup>2</sup>/gm could be produced by chemical and heat treatment at 1000 ºC for 2 h.</p>

scholarly journals Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

2019 ◽  
Vol 5 (1) ◽  
pp. 10 ◽  
Author(s):  
Lok Shrestha ◽  
Mamata Thapa ◽  
Rekha Shrestha ◽  
Subrata Maji ◽  
Raja Pradhananga ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Rice Husk ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Adsorption Properties ◽  
Methylene Blue Adsorption ◽  
Nanoporous Carbon Materials

Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

Electrically conductive cement mortar: Incorporating rice husk-derived high-surface-area graphene

2016 ◽  
Vol 125 ◽  
pp. 632-642 ◽  
Author(s):  
Inkyu Rhee ◽  
Jun Seok Lee ◽  
Yoong Ahm Kim ◽  
Jin Hee Kim ◽  
Ji Hoon Kim
Keyword(s):  
Surface Area ◽  
Rice Husk ◽  
Cement Mortar ◽  
High Surface ◽  
High Surface Area ◽  
Electrically Conductive

Preparation and Characterization of Rice Husk Ash for Adsorption of Phenol from Aqueous Solutions

2014 ◽  
Vol 625 ◽  
pp. 498-502
Author(s):  
Samah B. Daffalla ◽  
Hilmi Mukhtar ◽  
Maizatul S. Shaharun
Keyword(s):  
Aqueous Solutions ◽  
Surface Area ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Physiochemical Properties ◽  
Pseudo Second Order

In this research, the development of three (3) low-cost adsorbent materials from abundant waste rice husk was achieved via thermal treatment. The physiochemical properties of the developed adsorbents were evaluated. Their adsorption behaviours in batch system were evaluated for the removal of phenol from aqueous solutions by varying the pH (2 to 10). It was found that, the rice husk ash burned a 400oC for 1hr ‘RHA400,1’ has the highest surface area (201.36 m2.g-1) followed by RHA300,4(87.08 m2.g-1) and RHA600,1(43.22 m2.g-1), respectively. RHA400,1had shown the highest removal efficiency followed by RHA300,4and RHA600,1, towards phenol due to high surface area and porosity. The maximum uptake of phenol was found at pH 4. The adsorption kinetics was well described by both pseudo-second order and the Elovich models.

A microporous and high surface area active carbon obtained by the heat-treatment of chitosan

Carbon ◽  
2012 ◽  
Vol 50 (8) ◽  
pp. 3098-3101 ◽  
Author(s):  
Anna Kucinska ◽  
Aleksandra Cyganiuk ◽  
Jerzy P. Lukaszewicz
Keyword(s):  
Heat Treatment ◽  
Surface Area ◽  
Active Carbon ◽  
High Surface ◽  
High Surface Area

scholarly journals Activated Carbon from Rice Husk Biochar with High Surface Area

2020 ◽  
Vol 11 (3) ◽  
pp. 10265-10277
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Rice Husk ◽  
Activated Carbons ◽  
Solid Phase ◽  
Chemical Activation ◽  
High Surface ◽  
High Surface Area ◽  
Array Detector ◽  
Functional Density Theory

Activated carbons derived from rice husk pyrolysis (biochar) were prepared by chemical activation at different biochar/K2CO3 proportions in order to assess its capacity as adsorbent. The activated material was characterized by X-ray diffraction (DRX), Raman spectroscopy, scanning electron microscopy (SEM), the Brunauer, Emmet, and Teller (BET) method. The Barret, Joyner, and Halenda (BJH) method and functional density theory (DFT), presenting interesting texture properties, such as high surface area (BET 1850 m2 g-1) and microporosity, which allow its use as a sorbent phase in solid-phase extraction (SPE) of the main constituents of the aqueous pyrolysis phase. It was demonstrated that the activated carbon (RH-AC) adsorbs different compounds present in from rice husk pyrolysis wastewater through quantitative analysis by high-performance liquid chromatography with a diode-array detector (HPLC-DAD), presenting good linearity (R2 > 0.996) at 280 nm.

Nanoporous photocatalysts developed through heat-driven stacking of graphitic carbon nitride nanosheets

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 14027-14033 ◽  
Author(s):  
Zhijun Huang ◽  
Fengbo Li ◽  
Bingfeng Chen ◽  
Guoqing Yuan
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
Surface Area ◽  
Carbon Nitride ◽  
High Surface ◽  
High Surface Area ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Carbon Nitride Nanosheets

Nanostructured g-C3N4 with high surface area from heat treatment of guanidinium cyanurate exhibits better optical properties and enhanced photocatalytic activity.

High surface area activated carbon from rice husk as a high performance supercapacitor electrode

2016 ◽  
Vol 192 ◽  
pp. 110-119 ◽  
Author(s):  
Ellie Yi Lih Teo ◽  
Lingeswarran Muniandy ◽  
Eng-Poh Ng ◽  
Farook Adam ◽  
Abdul Rahman Mohamed ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Rice Husk ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
Supercapacitor Electrode

Nanocomposite aerogels: The SiO2–Al2O3 system

1993 ◽  
Vol 8 (12) ◽  
pp. 3163-3167 ◽  
Author(s):  
Sridhar Komarneni ◽  
Rustum Roy ◽  
Ulagaraj Selvaraj ◽  
Prakash B. Malla ◽  
Else Breval
Keyword(s):  
Heat Treatment ◽  
Surface Area ◽  
High Temperatures ◽  
High Surface ◽  
High Surface Area ◽  
Single Component ◽  
Second Phase ◽  
Surface Areas

Monolithic nanocomposite aerogels of two aluminosilicate compositions have been prepared and characterized by different techniques. The results show that high surface area and mesoporosity can be preserved in the above nanocomposite aerogels by heating at 1000 °C, unlike the single component aerogels. The presence of alumina as a second phase prevented their densification which resulted in surface areas on the order of 500–600 m2/g and mesopores of about 5–6 nm in diameter after heat treatment at 1000 °C. These novel nanocomposite aerogels are expected to find applications at high-temperatures in separations, insulation, catalysis, etc.

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