scholarly journals Preparation and characterization of mesoporous zeolite from solid waste

2020 ◽  
Vol 9 (4) ◽  
pp. 64-69
Author(s):  
Hao Nguyen Truong Gia ◽  
Huy Tran Huynh Gia ◽  
Phuong Nguyen Thi Truc ◽  
Tu Le Nguyen Quang ◽  
Dung Nguyen Van ◽  
...  
Keyword(s):  
Solid Waste ◽  
Surface Area ◽  
Rice Husk ◽  
Pore Volume ◽  
Rice Husk Ash ◽  
Mesoporous Zeolite ◽  
Top Down ◽  
Bottom Up ◽  
Gel Composition

In this study, experimental results on mesoporous zeolite preparation from a common solid waste, the rice husk ash by a top-down and bottom-up approach were reported. In top-down method, the consecutive treatments of zeolite by acid and alkaline in the presence of a cationic surfactant (CTAB) successfully generated mesopores in the zeolite. In bottom-up method, the sufficient added amount of CTAB in the gel composition could form mesopores in the zeolite. The obtained mesoporous zeolite possessed mesopore with a size of around 3-6 nm in both top-down and bottom-up approaches. As a result, the pore volume of the mesoporous zeolite was significantly increased by more than 60% when comparing to the “parent” rice-husk-ash derived zeolite. Significantly, the mesopore surface area of the mesoporous zeolite could be 2.4 times higher than that of the parent zeolite.

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.

New Insight Technique for Synthesis of Silica Gel from Rice Husk Ash by Using Microwave Radiation

2014 ◽  
Vol 1025-1026 ◽  
pp. 574-579 ◽  
Author(s):  
Nuchanaporn Pijarn ◽  
Pichit Galajak
Keyword(s):  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Silica Gel ◽  
Specific Surface Area ◽  
Rice Husk ◽  
Pore Volume ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Microwave Technique

Silica gel is the chemical substance that has many good advantages such as absorbed moisture, porosity, small diameter, high surface area, and lightweight. It was synthesized by using rice husk ash via sol – gel heating in the microwave technique. The objectives in this work compose of synthesis silica gel by using the microwave technique before characterizatization. This raw material was archived from rice husk ash, obtained from agricultural waste. The silica gel, synthesized by conventional method (CVM) and commercial silica gel (COM), was also studied for comparison purposes. The results showed that successfully synthesized the silica gel by sol - gel technique using microwave. The XRD pattern of silica gel enhanced from this method was not sinificantly different as compared with CVM and COM methods. And the physical properties of this technique could be debated. The particle size of silca gel was determined by zetasizer and it was approxmately 50-70 nm. The pore size diameter, pore volume, and specific surface area of silica gel were calculated by Flowsorb II and a Quantachrome Autosorp-1. The pore size diameter, pore volume, and specific surface area of silica gel are 10-30 nm, 0.7-1.0 cm3/g, and 400-700 m2/g, respectively. Consequently, this work is considered to be the waste to make useful, and a great way to save energy and time in the silica gel synthesis.

Synthesis and characterization of high surface area nanosilica from rice husk ash by surfactant-free sol–gel method

2013 ◽  
Vol 69 (3) ◽  
pp. 465-472 ◽  
Author(s):  
A. F. Hassan ◽  
A. M. Abdelghny ◽  
H. Elhadidy ◽  
A. M. Youssef
Keyword(s):  
Surface Area ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Synthesis And Characterization ◽  
Gel Method ◽  
Sol Gel Method

Synthesis and characterization of red mud and rice husk ash-based geopolymer composites

2013 ◽  
Vol 37 ◽  
pp. 108-118 ◽  
Author(s):  
Jian He ◽  
Yuxin Jie ◽  
Jianhong Zhang ◽  
Yuzhen Yu ◽  
Guoping Zhang
Keyword(s):  
Rice Husk ◽  
Red Mud ◽  
Rice Husk Ash ◽  
Synthesis And Characterization ◽  
Geopolymer Composites

scholarly journals Characterization of Ultrafine Silica Prepared from Rice Husk Ash by Sol-Gel Method

2021 ◽  
Vol 1053 (1) ◽  
pp. 012072
Author(s):  
Dewi Qurrota A’yuni ◽  
Mohamad Djaeni ◽  
Agus Subagio
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ultrafine Silica

Physicochemical characterization of Amine-functionalized Bio-nanosilica extracted from rice husk ash as a platinum support

2021 ◽  
Author(s):  
Jivita Darshini Sinniah ◽  
Wai Yin Wong ◽  
Kee Shyuan Loh ◽  
Rozan Mohamad Yunus
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Physicochemical Characterization ◽  
Amine Functionalized

Ambivalences of populism: The case of Catalan independentism

2018 ◽  
Vol 57 (4) ◽  
pp. 573-587 ◽  
Author(s):  
Daniel Gamper Sachse
Keyword(s):  
Social Mobilization ◽  
Top Down ◽  
Bottom Up ◽  
Democratic Experience ◽  
Procedural Safeguards

Most of the Spanish media have portrayed Catalan independentism as nationalism and populism. This article argues that this political and social mobilization does not fit into the usual definitions of populism as anti-elitist, anti-liberal and anti-pluralistic movement. Catalan independentism is here interpreted by stressing its democratic features, namely as a form of democratic populism: horizontally organized, and critical of procedural safeguards and counter-majoritarian powers. The popular organization of the referendum on 1 October 2017 and the vigorous democratic experience by almost half of the population of Catalonia allow for a characterization of this populism as a hybrid phenomenon that includes bottom-up and top-down dynamics, thereby contrasting with the usual leader-centred understanding of populism.

scholarly journals Optimization of nanostructured/nano sized rice husk ash preparation

2020 ◽  
Vol 17 (3(Suppl.)) ◽  
pp. 0953
Author(s):  
Medhat Mostafa ◽  
Hamdy Salah ◽  
Amro B. Saddek ◽  
Nabila Shehata
Keyword(s):  
Particle Size ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Particle Shape ◽  
Rice Husk Ash ◽  
Loss On Ignition ◽  
Shape Distribution ◽  
Disk Mill ◽  
Grinding Time

The objective of the study is developing a procedure for production and characterization of rice husk ash (RHA). The effects of rice husk (RH) amount, burning/cooling conditions combined with stirring on producing of RHA with amorphous silica, highest SiO2, lowest loss on ignition (LOI), uniform particle shape distribution and nano structured size have been studied. It is concluded that the best amount is 20 g RH in 125 ml evaporating dish Porcelain with burning for 2 h at temperature 700 °C combined with cooling three times during burning to produce RHA with amorphous silica, SiO2 90.78% and LOI 1.73%. On the other hand, cooling and stirring times affect the variation of nano structured size and particle shape distribution. However, no crystalline phases were found in RHA in all cases. Results proved that the Attritor ball mill was more suitable than vibration disk mill for pulverizing nano structured RHA with 50% of particle size (D50) lower than 45 mm and 99 % of particle size (D99) lower than 144 mm to nanosized RHA with D50 lower than 36 nm and D99 lower than 57 nm by grinding time 8.16 min to every 1 g RHA without changes in morphousity of silica.

Elemental Characterization of Rice Husk Ash from Local Rice Species in South Eastern Nigeria

2020 ◽  
Vol 3 (4) ◽  
pp. 1081-1085
Author(s):  
Paul S. Ogbuefi ◽  
Placid Nwaokafor ◽  
Ifeanyi J. Njoku ◽  
Ogechukwu J. Uzuegbunam
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
South Eastern ◽  
Elemental Characterization
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