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

In this study, the preparation of porous nanocomposite scaffolds (HX-CNT) from a combination of a hydroxamic derivative of alginate (HX) and an amine-functionalized multiwalled carbon nanotube (CNT) at different concentrations is described. The structure of HX was investigated by FTIR, and the degree of substitution around 9% was confirmed by elemental analysis. The interaction between CNT and alginate derivative in the nanocomposite crosslinked with calcium was confirmed by FTIR, Raman spectroscopy, and SEM. The results obtained in this study showed that scaffolds based on HX-CNT composites with a 4 wt% concentration level exhibited improved physical and mechanical properties compared to plain alginate (Young’s modulus increased from 2.2 to 5.1 MPa and elastic strength from 0.13 to 0.25 MPa) and decreased the swelling ratios from ~900 to ~673. The cytotoxicity assays using the L929 cell line proved that the nanocomposite scaffolds were nontoxic, even at the highest CNT concentration.

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Optimization of nanostructured/nano sized rice husk ash preparation

Baghdad Science Journal ◽

10.21123/bsj.2020.17.3(suppl.).0953 ◽

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.

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

Chemistry Africa ◽

10.1007/s42250-020-00188-7 ◽

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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Preparation and characterization of rice husk ash (RHA)-TiO2 / ZnO composites and its application in treating effluents from textile industries

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v47i4.14075 ◽

2013 ◽

Vol 47 (4) ◽

pp. 445-448 ◽

Cited By ~ 2

Author(s):

MH Kabir ◽

MF Kabir ◽

F Nigar ◽

S Ahmed ◽

AI Mustafa ◽

...

Keyword(s):

Composite Materials ◽

Rice Husk ◽

Rice Husk Ash ◽

Textile Dye ◽

X Ray ◽

Textile Dye Effluent ◽

Degradation Reaction ◽

D Values ◽

Sun Light

Photocatalytic composite materials incorporating the photocatalysts (TiO2, ZnO) with rice husk ash (RHA) have been developed to investigate the photodegradation of real textile dye effluent. The structural characterization of the composite materials was performed using XRD (X-Ray Diffractometer). The characteristic XRD peaks together with the 2? values for both TiO2 and ZnO were in excellent agreement with the standard JCPDS d-values. The efficacy of these composites was examined through the degradation of a textile dye, collected from a local dye house. The sun light was used as the source of illumination for the preceding degradation reaction. Bangladesh J. Sci. Ind. Res. 47(4), 445-448, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.14075

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Improvement of Collapsible Soil Behavior of a Lateritic Soil Using Rice Husk Ash

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.668.290 ◽

2015 ◽

Vol 668 ◽

pp. 290-296 ◽

Cited By ~ 1

Author(s):

Luiza P. Fagundes ◽

Jhaber D. Yacoub ◽

Andrey C. Lima ◽

Flávia R. Nakatsuchi ◽

José A. Lollo ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Combined Effect ◽

Building Construction ◽

Lateritic Soil ◽

Soil Behavior ◽

Collapsible Soil ◽

Lateritic Soils ◽

Environmental Friendly

Great areas of Brazil present lateritic soils, such as the northeast and the south. Some of these soils have, as main characteristic, instable structures that can present considerable volumetric deformation in the presence of water. This behavior, also named collapse, is responsible for several problems on the building construction such as cracks and fractures that can damage the safety of structures. The aim of this paper is to assess the possibility of improvement of collapsible behavior of a lateritic soil using rice husk ash (RHA). A previous characterization of soil and RHA was performed in order to assess the combined effect of soil/RHA. The results are so promising, showing a new alternative to reduce the collapsible behavior of soils using an environmental friendly technology.

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Characterization of rice husk ash prepared by open air burning and furnace calcination

Journal of Chemical Engineering and Materials Science ◽

10.5897/jcems2020.0348 ◽

2020 ◽

Vol 11 (2) ◽

pp. 24-30

Author(s):

Mbinda Jonathan Kaleli ◽

Paul Kuria Kamweru ◽

Joel Mwangi Gichumbi ◽

Francis Gichuki Ndiritu

Keyword(s):

Rice Husk ◽

Rice Husk Ash

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Effects of Sintering Temperature Variation on Synthesis of Glass-Ceramic Phosphor Using Rice Husk Ash as Silica Source

Materials ◽

10.3390/ma13235413 ◽

2020 ◽

Vol 13 (23) ◽

pp. 5413

Author(s):

Rabiatul Adawiyah Abdul Wahab ◽

Mohd Hafiz Mohd Zaid ◽

Sidek Hj. Ab Aziz ◽

Khamirul Amin Matori ◽

Yap Wing Fen ◽

...

Keyword(s):

Rice Husk ◽

Glass Ceramic ◽

Rice Husk Ash ◽

Glass Ceramics ◽

Xrd Analysis ◽

Sintering Process ◽

X Ray Diffraction ◽

Silica Source ◽

Quenching Method

In this study, the authors attempted to propose the very first study on fabrication and characterization of zinc-boro-silicate (ZBS) glass-ceramics derived from the ternary zinc-boro-silicate (ZnO)0.65(B2O3)0.15(RHA)0.2 glass system through a conventional melt-quenching method by incorporating rice husk ash (RHA) as the silica (SiO2) source, followed by a sintering process. Optimization of sintering condition has densified the sintered samples while embedded beta willemite (β-Zn2SiO4) and alpha willemite (α-Zn2SiO4) were proven in X-ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FESEM) has shown the distribution of willemite crystals in rhombohedral shape crystals and successfully form closely-packed grains due to intense crystallization. The photoluminescence (PL) spectra of all sintered ZBS glasses presented various emission peaks at 425, 463, 487, 531, and 643 nm corresponded to violet, blue, green, and red emission, respectively. The correlation between the densification, phase transformation, microstructure, and photoluminescence of Zn2SiO4 glass-ceramic phosphor is discussed in detail.

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