One-step synthesis of ordered Sn-substituted SBA-16 mesoporous materials using prepared silica source of rice husk and their selectively catalytic activity

2011 ◽  
Vol 91 (1) ◽  
pp. 34-46 ◽  
Author(s):  
Sy-Thang Ho ◽  
Quang-Khieu Dinh ◽  
Thai-Hoa Tran ◽  
Huu-Phu Nguyen ◽  
Thanh-Dinh Nguyen
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Materials ◽  
Rice Husk ◽  
Silica Source ◽  
One Step

Adsorption of Methyl Blue on Mesoporous Materials Using Rice Husk Ash as Silica Source

2016 ◽  
Vol 16 (4) ◽  
pp. 4108-4114 ◽  
Author(s):  
Nhat Thien Nguyen ◽  
Shiao-Shing Chen ◽  
Nguyen Cong Nguyen ◽  
Hau Thi Nguyen ◽  
Hsiao Hsin Tsai ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mesoporous Materials ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Methyl Blue ◽  
Ammonium Bromide ◽  
Tem Analysis ◽  
Silica Source ◽  
Silica Materials ◽  
Mesoporous Silica Materials

It is recognized that recycling and reuse of waste can result in significant savings in materials and energy. In this research, the adsorption of methyl blue (MB) using waste rice husk ash (Rha) and mesoporous silica materials made from Rha (R-MCM) were analyzed. Mesoporous silica materials were synthesized using cetyltrimethyl ammonium bromide (CTAB) as a cationic surfactant and Rha as the silica source. The prepared samples were characterized by Brunnaur-Emmet-Teller (BET) adsorption isotherm analyzer and transmission electron microscope (TEM) analysis. The results showed the surface area of R-MCM materials was 1347 m2g−1 and the pore volume was 0.906 cm3g−1. TEM analysis showed that the mesoporous materials generally exhibited ordered hexagonal arrays of mesopores with a uniform pore size. The effects on adsorption performance under different initial dye concentrations, different pH values and different dosages of adsorbent were also studied. Both Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The results show that the maximum removal efficiency of MB more than 99%.

The effect of crystallization time on structure, microstructure, and catalytic activity of zeolite-A synthesized from rice husk silica and food-grade aluminum foil

2021 ◽  
Vol 148 ◽  
pp. 106050
Author(s):  
Wasinton Simanjuntak ◽  
Kamisah D. Pandiangan ◽  
Zipora Sembiring ◽  
Agustina Simanjuntak ◽  
Sutopo Hadi
Keyword(s):  
Catalytic Activity ◽  
Rice Husk ◽  
Aluminum Foil ◽  
Crystallization Time ◽  
Zeolite A ◽  
Food Grade ◽  
Rice Husk Silica

Catalytic activity of CuGHK peptide-based porous material

2021 ◽  
Author(s):  
Francisco G. Cirujano ◽  
Nuria Martin ◽  
Neyvis Almora-Barrios ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Catalytic Activity ◽  
Porous Material ◽  
Active Sites ◽  
Room Temperature ◽  
Side Chain ◽  
Periodic Distribution ◽  
Lysine Side Chain ◽  
One Step

Room temperature one-step synthesis of the peptide-based porous material with a periodic distribution of pockets decorated with lysine side chain active sites behaves as a heterogeneous organocatalyst. The pockets are...

Synthesis, characterization of MCM-22 and catalytic activity in one-step synthesis of methyl isobutyl ketone

2005 ◽  
Vol 84 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Piaoping Yang ◽  
Jianfeng Yu ◽  
Zhenlü Wang ◽  
Meiping Xu ◽  
Qingsheng Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methyl Isobutyl Ketone ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
One Step

Coral-like hydroxy sodalite particles from rice husk ash as silica source

2011 ◽  
Vol 65 (23-24) ◽  
pp. 3408-3410 ◽  
Author(s):  
Milan Kanti Naskar ◽  
Debtosh Kundu ◽  
Minati Chatterjee
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Silica Source

Preparation of Fe/activated carbon directly from rice husk pyrolytic carbon and its application in catalytic hydroxylation of phenol

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 4984-4992 ◽  
Author(s):  
Xian Zhang ◽  
Yaxin Li ◽  
Guiying Li ◽  
Changwei Hu
Keyword(s):  
Activated Carbon ◽  
Rice Husk ◽  
Pyrolytic Carbon ◽  
Catalytic Performance ◽  
Phenol Hydroxylation ◽  
Hydroxylation Of Phenol ◽  
One Step

The loading of iron and the formation of activated carbon were combined to one step and the thus-obtained Fe/activated carbon showed good catalytic performance for phenol hydroxylation.

Bilayer graded Al/B4C/rice husk ash composite: Wettability behavior, thermo-mechanical, and electrical properties

2018 ◽  
Vol 52 (27) ◽  
pp. 3745-3758 ◽  
Author(s):  
Amin Bahrami ◽  
Niloofar Soltani ◽  
Martin I Pech-Canul ◽  
Shaghayegh Soltani ◽  
Luis A González ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Aluminum Alloys ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Material Selection ◽  
Coefficient Of Thermal Expansion ◽  
Thermal Expansion Coefficients ◽  
One Step ◽  
The Difference

In this study, wettability behavior of B4C substrate as well as B4C/crystalline rice husk ash and B4C/amorphous rice husk ash substrates with two aluminum alloys were studied. The electrical resistivity, thermal expansion coefficients, and thermal diffusivity of bilayer Al/B4C/rice husk ash composite fabricated by one-step pressureless infiltration were measured and the obtained data were systemically analyzed using the Taguchi method and analysis of variance. Boron carbide substrates after addition of amorphous or crystalline rice husk ash display good wettability with molten aluminum alloys. The results show that, electrical resistivity of Al/B4C/rice husk ash composites is mainly influenced by initial preform porosity, while the coefficient of thermal expansion of composites is determined by the chemical composition of infiltrated alloys. The measured values for coefficient of thermal expansion (10.5 × 10−6/℃) and electrical resistivity (0.60 × 10−5 Ω.m) of Al/B4C/rice husk ash composites, fabricated according to analysis of variance's optimal conditions are in good agreement with those of the projected values (11.02 × 10−6/℃ and 0.65 × 10−5 Ω.m, respectively). The difference between the corresponding values obtained from verification tests and projected values, for electrical resistivity and coefficient of thermal expansion are less than 5%. Finally, as a material selection approach, the strengths and weaknesses of the composites have been graphed in the form of radar diagrams.

Formation of Ferrosilicon Alloy at 1550°C via Carbothermic Reduction of SiO2 by Coal and Graphite: Implication for Rice Husk Ash Utilization

2021 ◽  
Vol 315 ◽  
pp. 16-24
Author(s):  
Somyote Kongkarat ◽  
Meekaruna Boonyaratchinda ◽  
Chirakit Chobtham
Keyword(s):  
Rice Husk ◽  
Carbothermic Reduction ◽  
Rice Husk Ash ◽  
Molar Ratio ◽  
Alloy Formation ◽  
Silica Source ◽  
Commercial Method ◽  
Agricultural Industries ◽  
Si Content ◽  
Mixed Samples

Ferrosilicon alloy has been commercially produced in an electric furnace at 1700 - 1750 °C, using quartz as a silica source. With an aim to reduce production cost, rice husk ash (RHA) had been introduced to the process as a silica source. The present study reports an in-depth investigation on the ferrosilicon alloy formation at 1550 °C via carbothermic reduction using RHA with coal and graphite. Blend A: RHA/Fe2O3/Coal and B: RHA/Fe2O3/Graphite were prepared according to the C/O molar ratio of 1/1. The well-mixed samples were compacted into a pellet and then heated at 1550 °C in the tube furnace for 30 and 60 minutes while the argon flowing at the rate of 1 L/min. XRD and SEM results show that the bulk metal mainly composes of FeSi phase, while SiC and other slag phases adhere at the surface of the droplet. Characteristics of the carbonaceous materials, especially ash oxides content affect the kinetic of ferrosilicon formation. Silicon concentration in the produced metal droplets was measured using an ICP technique. For blend A, Si content in the metal was 18.3 wt% and 81.9 wt% after 30 and 60 minutes, respectively. While, Si recovery in the metal for blend B reached 88.4 wt% since 30 minutes. The experimental results show that the production of ferrosilicon alloy from RHA can be produced at 1550 °C, which the temperature lower than that of the commercial method by 150-200 °C. The finding in this research is beneficial for ferrosilicon and agricultural industries and thus promotes the sustainable steelmaking industry.

Moving into Nanotechnology Roles to Mimic and Boost Enzyme Activity

2018 ◽  
pp. 421-440
Author(s):  
Maria Laura Soriano
Keyword(s):  
Enzyme Activity ◽  
Catalytic Activity ◽  
Enzyme Immobilization ◽  
Mesoporous Materials ◽  
Specific Activity ◽  
Artificial Enzymes ◽  
Catalytic Nanoparticles ◽  
Solid Liquid ◽  
By Products ◽  
Insight Into

A new tendency toward the design of artificial enzymes based on nanostructures (nanodots, nanofibers, mesoporous materials) has emerged. On one hand, nanotechnology bestows self-catalytic nanoparticles with a specific activity to achieve efficient reactions with low number of by-products. On other hand, the nanoparticles may behave as nanometric scaffolds for hosting enzymes, promoting their catalytic activity and stability. In this case, enzyme immobilization requires the preservation of the catalytic activity by preventing enzyme unfolding and avoiding its aggregation. These approaches render many other advantages like hosting/storing enzymes in nanotechnological solid, liquid, and gel-like media. This chapter focuses on the most up-to-date approaches to manipulate or mimic enzyme activity based on nanotechnology, and offers examples of their applications in the most promising fields. It also gives new insight into the creation of reusable nanotechnological tools for enzyme storage.

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