Comparison of the modifying effect of rice ashand buckwheat husk in epoxy antifriction coatings

This paper discusses the issue of utilization of rice and buckwheat husks, a comparison of their modifying effect in epoxy antifriction coatings, for this, the elemental composition of these fillers was determined using X-ray fluorescence analysis, their structure was analyzed by scanning electron microscopy, and the acid-base characteristics of the filler surface were determined by the pH method., the surface area of the pores of the ash of rice and buckwheat husks, their oil absorption were calculated, a sol-gel analysis was carried out to assess the density of the spatial network of filled epoxy coatings, and their wear resistance and hardness were determined. In the course of the research, the optimal temperature for obtaining ash from rice and buckwheat husks was established, which contributes to an increase in wear resistance, hardness and a decrease in the static friction coefficient of filled epoxy coatings. It is shown that the optimal temperature for obtaining rice husk ash is 500 C, and buckwheat husk ash 800 C. At the same time, rice husk ash is a more effective filler for epoxy polymers than buckwheat husk ash, since it increases the hardness of materials and provides a greater decrease in their friction coefficient.

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EPOXY ANTIFRICTION COATINGS FILLED WITH THE RICE HUSKS ASH TREATED WITH SURFACTANTS

Vektor nauki Tol yattinskogo gosudarstvennogo universiteta ◽

10.18323/2073-5073-2021-3-28-36 ◽

2021 ◽

pp. 28-36

Author(s):

A. R. Valeeva ◽

◽

E. M. Gotlib ◽

E. S. Yamaleeva ◽

◽

...

Keyword(s):

Wear Resistance ◽

Rice Husk ◽

Quaternary Ammonium ◽

Bending Strength ◽

Rice Husk Ash ◽

Quaternary Ammonium Salts ◽

Ammonium Salts ◽

High Wear Resistance ◽

Antifriction Coatings ◽

Antifriction Properties

The use of epoxy antifriction coatings can significantly reduce thermal stress in the friction zone and expand the coating working temperature interval while keeping high wear resistance. The paper considers the effect of non-activated and activated by surfactants silicate filler – rice husk ash on the physicochemical and mechanical properties of epoxy materials applied as antifriction coatings. All studied samples of rice husk ash, both initial and activated with surfactants, have an alkaline surface nature. The study identified that all cationic quaternary ammonium salts (QAS) reduce the pH of rice husk ash. At the same time, nonionic OXIPAV increases this indicator. Activation of the rice husk ash surface, both by the quaternary ammonium salts and aminosilanes, significantly reduces the porosity of this silicate. In this case, the average pore diameter does not change significantly, and their specific surface area decreases significantly, to a lesser extent, when activated by nonionic quaternary ammonium salts. The application of quaternary ammonium salts and aminosilanes in the amount of 33 % for activation of the surface of the investigated silicate filler reduces its modifying effect in epoxy compositions, regardless of the chemical structure of the surfactants used, which is not a typical effect. Therefore, the authors assumed that the suboptimal concentration of quaternary ammonium salts and aminosilanes was used. The study identified that the optimal concentration of 50 % alcohol solution of KATAPAV is 14.7–21 %. In this range of the QAS content, there is a significant increase in hardness (about 40 %), a slight decrease in wear (about 10 %), and a significant decrease in the coefficient of static friction (up to 2 times). At the same time, the authors observed an increase in adhesion to metal up to 3 times and bending strength up to 25 %. Thus, rice husk ash activated with an optimal amount of quaternary ammonium salts is an effective modifier of epoxy coatings, which improves their antifriction properties and increases wear resistance, hardness, strength, and adhesion characteristics.

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

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1053/1/012072 ◽

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

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Synthesis of Silica-Salen Derivative from Rice Husk Ash and its Use for Extraction of Divalent Metal Ions Co(II), Ni(II) and Cu(II)

Indonesian Journal of Chemistry ◽

10.22146/ijc.38558 ◽

2019 ◽

Vol 20 (1) ◽

pp. 16 ◽

Cited By ~ 1

Author(s):

Duha Hussien Attol ◽

Hayder Hamied Mihsen

Keyword(s):

Metal Ions ◽

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Xrd Analysis ◽

Divalent Metal Ions ◽

Prepared Compound ◽

Absorption Bands ◽

Pseudo Second Order ◽

Ft Ir

Rice husk ash (RHA) was used to prepare sodium silicate, which in turn was functionalized with 3-(chloropropyl)triethoxysilane employing the sol-gel technique to form RHACCl. Chloro group in RHACCl was replaced with iodo group forming RHACI. Ethylenediamine was immobilized on RHACI in order to prepare it for the reaction with salicylaldehyde to form a silica derivative-salen. FT-IR analysis indicated the presence of secondary amine and –NH and C=N absorption bands. XRD analysis revealed the occurrence of the broad diffused peak with maximum intensity at 22–23° (2θ). BET measurements showed also that the surface area of the prepared compound is 274.55 m2/g. Elemental analysis proved the existence of nitrogen in the structure of the prepared compound. The silica derivative-salen showed high potential for extraction and removal of heavy contaminating metal ions Ni(II), Cu(II), and Co(II) from aqueous solutions. The kinetic study demonstrates that the adsorption of the metal ions follows the pseudo-second order.

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Synthesis of bimodal porous silica from rice husk ash via sol–gel process using chitosan as template

Materials Letters ◽

10.1016/j.matlet.2007.09.004 ◽

2008 ◽

Vol 62 (10-11) ◽

pp. 1476-1479 ◽

Cited By ~ 59

Author(s):

T. Witoon ◽

M. Chareonpanich ◽

J. Limtrakul

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Porous Silica ◽

Sol Gel Process

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Effect of Rice Husk Ash Based Silicon Dioxide on the Properties of SUZ-4 Zeolite

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.729.24 ◽

2017 ◽

Vol 729 ◽

pp. 24-29

Author(s):

Thitipob Sirisoontornpanit ◽

Atichat Wongkoblab ◽

Supunnee Junpirom

Keyword(s):

Silicon Dioxide ◽

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Hydrothermal Process ◽

Temperature Programmed Desorption ◽

Acid Sites ◽

Weak Acid ◽

Molar Ratio ◽

Temperature Programmed

SUZ-4 zeolite was synthesized by the sol-gel technique, followed by hydrothermal process. The effect of the molar ratio of rice husk ash based silicon dioxide to silica solution was investigated. The synthesized zeolite was characterized by XRD, SEM, N2 adsorption and temperature programmed desorption. The results show that the SUZ-4 zeolite was formed for all investigated conditions. However, the formation of MER zeolite occurred as an impurity for the content of rice husk ash higher than 75%. A needle shape crystal with mainly microporous structure is the feature of synthesized SUZ-4 zeolite. The result of temperature programmed desorption indicated that the chemical surface property of obtained SUZ-4 zeolite was weak acid sites.

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Sappan Natural Dyed Biocomposites from Poly(Lactic Acid) and Aluminum Silicate Synthesized via Sol-Gel Method from Rice Husk Ash

Engineering Journal ◽

10.4186/ej.2021.25.2.305 ◽

2021 ◽

Vol 25 (2) ◽

pp. 305-315

Author(s):

Pajaera Patanathabutr ◽

Nattakarn Hongsriphan

Keyword(s):

Lactic Acid ◽

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Poly Lactic Acid ◽

Aluminum Silicate ◽

Gel Method ◽

Sol Gel Method

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Deposition of Hydroxyapatite on Silica Made from Rice Husk Ash to Produce the Powder Component of Calcium Phosphate Cement

Indonesian Journal of Chemistry ◽

10.22146/ijc.57900 ◽

2020 ◽

Author(s):

Tri Windarti ◽

Widjijono Widjijono ◽

Nuryono Nuryono

Keyword(s):

Calcium Phosphate ◽

Rice Husk ◽

Calcium Phosphate Cement ◽

Rice Husk Ash ◽

Sol Gel ◽

Molar Ratio ◽

Composite Surface ◽

Cell Parameters ◽

Powder Component ◽

Sio2 Particles

Hydroxyapatite (HA) has been deposited on silica (SiO2) particles to produce HA-SiO2 composite that will be used as the powder component of calcium phosphate cement. HA was expected to be on the composite surface to maintain its bioactivity. SiO2 was made by the sol-gel method, in which silicate solution was extracted from rice husk ash with NaOH solution. Deposition of HA on SiO2 was carried out by wet chemical deposition method at various Ca/Si molar ratio (in a range of 5–25) followed by calcination at 600 °C for 2 h. Results showed that HA was successfully deposited on SiO2 particles. The cell parameters of the HA crystals were slightly distorted by the presence of SiO2 and HA in the composite had a bigger cell volume than pure HA. The crystallite size of HA in the composites increased with the increase of the Ca/Si ratio but the values were smaller than pure HA. SiO2 acted as a morphology directing agent. At low Ca/Si ratio, the HA-SiO2 particles were in a form of short rod-like particles with sizes of < 50 nm, while at high Ca/Si ratio, a mixture of short and long rod-like particles with the size of < 100 nm was obtained. The zeta potential of composites was almost similar to pure HA. These properties indicated that HA-SiO2 composites support the bioactivity of injectable calcium phosphate cement.

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Preparation and Photocatalytic Characterization of Modified TiO2/Nd/rice Husk Ash Nanomaterial for Rifampicin Removal in Aqueous Solution

10.21203/rs.3.rs-581621/v1 ◽

2021 ◽

Author(s):

Thuy Dang Thi Ngoc ◽

Ha Nguyen Thi ◽

Anh Ngo Van ◽

Sen Nguyen Thi ◽

Dung Nguyen Duc ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Solar Irradiation ◽

Photocatalytic Decomposition ◽

Structure Characteristic ◽

Lower Efficiency ◽

Residue Decomposition ◽

First Order Kinetics

Abstract The neodymium doping of titanium dioxide with content of Nd varying from 0.01 to 0.8% was conducted by the sol-gel hydrothermic method. TiO2/Nd is then coated on rice husk ash to produce modified TiO2/Nd/rice husk ash material using Nd content of 0.36% w/w. The materials’ structure characteristic and photocatalytic properties have been analyzed by the XRD, EDX, TEM, SEM, forbidden zone energy (Eg) and specific surface area (BET). TiO2/Nd material shows a higher photocatalytic decomposition capacity in comparison to TiO2 and depended on the Nd content. The Rifampicin removal efficiency of TiO2/Nd materials with Nd contents ranged from 0.36 to 0.80% had an increase of about 40% higher than that of TiO2/Nd containing Nd from 0.01 to 0.28%. This new photocatalytic TiO2/Nd/rice husk ash material is used to decompose Rifampicin. Within 90 minutes under sunlight, the Rifampicin decomposed efficiency of TiO2/Nd and TiO2/Nd/rice husk ash material reached about 86 and 75%, respectively. Even lower efficiency was obtained, the latter material was chosen for Rifampicin residue decomposition in the water under sunlight through photocatalytic process because it has some advantages such as smaller amount was needed and easily to be recovered. Rifampicin removal process, k values were found matching more to zero and first order kinetics. Especially, for powder TiO2/Nd and TiO2/Nd/Rice husk ash under solar irradiation the R2 reached about 0.98.

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Synthesis and Characterization of Nano-Wollastonite from Rice Husk Ash and Limestone

Materials Science Forum ◽

10.4028/www.scientific.net/msf.756.43 ◽

2013 ◽

Vol 756 ◽

pp. 43-47 ◽

Cited By ~ 14

Author(s):

Hamisah Ismail ◽

Roslinda Shamsudin ◽

Muhammad Azmi Abdul Hamid ◽

Azman Jalar

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Sol Gel ◽

Synthesis And Characterization ◽

Mixed Solution ◽

Minor Phase ◽

Calcination Process ◽

Major Phase ◽

Nano Size

Wollastonite, CaSiO3 material was prepared from rice husk ash, as the source for SiO2 and limestone, source for CaO using sol-gel method. Rice husk ash and CaO powder was mixed together in 100ml distilled water with the rice husk ash/CaO ratios of 45:55 and 40:60. The mixed solution was place in the autoclave and heated at 135°C for 4 hours and calcined at 950°C for 1 and 2 hours. From the XRD results,ratio of 45:55 exhibited that b-wollastonite is the major phase and the minor phase is only contributed by cristoballite and by calcining the mixture for 2hrs would yield better crystallinity. Both of the rice husk ash:CaO ratios produced wollastonite materials in cylinder structures. Wollastonite with nano size grain was obtained for an hour calcination and 2 hrs of calcination would increase the grain size over 100 nm for ratio, 45:55 and 40:60.Therefore in order to get the nano size of wollastonite material, period of calcination process has to be controlled.

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