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Present advancement in production of carbon nanotubes and their derivatives from industrial waste with promising applications
(2017-01-01)
Kerdnawee, Konrat
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Termvidchakorn, Chompoopitch
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Yaisanga, Pacharaporn
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Pakchamsai, Jirapat
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Chookiat, Cheewapon
An increase in global consumption has led to an exponential increase in industrial production activities which inevitably results in overwhelming remain of industrial waste. Consequently it has driven increasing attentions of research and development teams in various countries to propose and investigate novel methodologies to utilize such industrial waste. Instead of using as alternative energy sources, usage of industrial waste for production of carbonaceous nanomaterials has been examined via various routes, such as catalytic pyrolysis, hydrothermal treatment and so on. Meanwhile, for sustainable and secure continuity of the carbonaceous nanomaterial production, broad spectra of promising applications have also been examined. Among those emerging applications, utilization of carbonaceous nanomaterials in pollution control and prevention has been focused worldwide. Therefore, in this review, relevant research works focusing on catalytic pyrolysis of carbonaceous industrial waste for carbonaceous nanomaterial production were comprehensively analyzed and summarized. In addition, promising applications involving with antibiotic removal, spilled oil handling and pollutant gas detection were also reviewed.
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Synthesis of carbon nanoparticles from used motor oil and benzene via solution plasma process
(2017-01-01)
Seangarunthong, Napatsawan
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Khongthong, Parinya
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Panomsuwan, Gasidit
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Ueno, Tomonaga
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Saito, Nagahiro
Carbon nanoparticles (CNPs) were successfully synthesized from the mixture of used motor oil and benzene via a solution plasma process (SPP). The synthesis was achieved within a single step at room temperature and atmospheric pressure. The effects of mixing ratio between used motor oil and benzene on the physical and chemical properties of CNPs were investigated by means of field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Raman spectroscopy. The results revealed that there were no significant changes in morphological feature and chemical functional groups on CNPs at different mixing ratios. The CNPs exhibited the aggregates of fine particles with the diameter of about 20-30 nm. The crystallinity of CNPs was found to be slightly increased when synthesized under the presence of used motor oil, possibly due to the effect of aliphatic hydrocarbons and polycyclic aromatic hydrocarbons in used motor oil. We expect that the conversion of used motor oil into CNPs by SPP could be another attractive way to add the value to used motor oil prior to disposing.
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Facile synthesis and characterization of tenorite nanoparticles from gas-atomized Cu powder
(2015-01-01)
Buarod, Eumporn
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Pithakratanayothin, Sakollapath
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Naknaka, Suchuta
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Chaiyasith, Pachernchaiyapat
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Yotkaew, Thanyaporn
CuO powder is widely used because of its high activity and selectivity in oxidation/reduction reactions. CuO nanoparticles are interesting because of their high ratio of surface area to mass, which is expected to enhance the catalytic performance of a material. Because of such importance, CuO nanoparticles were prepared by two different facile routes. The first involved the reaction of pure Cu powder with nitric acid to form Cu(NO<inf>3</inf>)<inf>2</inf> intermediate. In the second route, glacial acetic acid was employed to react with pure Cu powder to form Cu(CH<inf>3</inf>COO)<inf>2</inf> intermediate. After purification, both intermediates were reacted with NaOH via a solid-state route to form CuO powders. The intermediates and end products were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction technique. Experimental results indicated that synthesis of the CuO nanoparticles via the Cu(NO<inf>3</inf>)<inf>2</inf> intermediate yielded slightly higher product and fine particle sizes with a larger aspect ratio. In contrast, the Cu(CH<inf>3</inf>COO)<inf>2</inf> intermediate route yielded lower product yield and fine particle sizes with a smaller aspect ratio. However, due to the extremely fine particle size it was observed that nanoparticle agglomeration could not be avoided particularly in the CuO nanopowders produced via the Cu(CH<inf>3</inf>COO)<inf>2</inf> intermediate route.
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Comparative study of text-to-speech synthesis techniques for mobile linguistic translation process
(2014-03-30)
Chomwihoke, Phanchita
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Phankokkruad, Manop
This paper proposed the comparative study of speech synthesis techniques, which cover the five majorly techniques. In order to find out the most appropriate speech synthesis techniques by comparing the three performance factors that includes effectiveness, flexibility and simplicity. In the comparative study, we found that the HMM has the most performance in the speech synthesis. Not only, HMM gave good quality speech and without noise, but also it was easy to understand and not complexity of an implementation. Later, we conducted several experimental evaluations to demonstrate the performance of HMM speech synthesis on the two types of application in the different environments. The results shown that HMM able to produce the good quality of speech in high intelligible and flexibility in adjusting the parameters.
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A simple route to synthesize ferromagnetic binary calcium iron pyrophosphate CaFeP2O2 using aqueous-acetone media
(2013-08-30)
Chaiyasith, Pachernchaipat
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Ruttanapun, Chesta
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Thongkam, Montree
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Kongteweelert, Samart
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Woramongkonchai, Somsak
A binary calcium iron pyrophosphate CaFeP<inf>2</inf>O<inf>7</inf> was synthesized by solid state route using the mixing of calcium carbonate, iron metal and phosphoric acid in aqueous-acetone media at 600°C. The XRD datum indicates the formation of CaFeP<inf>2</inf>O<inf>7</inf> phase without the presence of any phase impurities. FTIR result indicates the presence of the P<inf>2</inf>O<inf>7</inf> 4- anion in the structure. Sheet-like microparticle of CaFeP<inf>2</inf>O<inf>7</inf> was revealed by SEM. Room temperature magnetization result showed ferromagnetic behavior of the synthesized CaFeP<inf>2</inf>O<inf>7</inf>, with saturation-specific magnetization value of 11.067 emu g-1 at 10kOe. The magnetic feature of the synthesized CaFeP<inf>2</inf>O<inf>7</inf> in this work compared with M<inf>2</inf>P<inf>2</inf>O<inf>7</inf> (M = Ca and Fe), its isotypic (CaMP2O7 (M= Mn and Co) and CFeP<inf>2</inf>O<inf>7</inf> (C= Co and Cu) reported in our previous works is important properties for specific applications. © (2013) Trans Tech Publications, Switzerland.
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Synthesis and ferromagnetic property of new binary copper iron pyrophosphate CuFeP2O7
(2010-02-15)
Boonchom, Banjong
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Vittayakorn, Naratip
The pyrophosphate of CuFeP<inf>2</inf>O<inf>7</inf> was synthesized through one step-thermal synthesis at 500 °C using the mixing of copper carbonate, iron metals and phosphoric acid. FTIR and XRD results indicate the dominant feature of pyrophosphate (P<inf>2</inf>O<inf>7</inf>4-) anion and a pure monoclinic phase with space group C<inf>2h</inf>6 (Z = 4), respectively. The crystallite size of 25 ± 9 nm for the CuFeP<inf>2</inf>O<inf>7</inf> was estimated by X-ray line broadening. Room temperature magnetization result shows ferromagnetic behavior of the CuFeP<inf>2</inf>O<inf>7</inf> powder, having hysteresis loop in the range of ± 10,000 Oe with the specific magnetization value of 1.57 emu g- 1. This property is important for specific application and is presented for the first time. © 2009 Elsevier B.V. All rights reserved.
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Synthesis and characterization of nanocrystalline manganese pyrophosphate Mn2P2O7
(2009-10-31)
Boonchom, Banjong
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Baitahe, Rattanai
Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf> polyhedral particles were synthesized by simple and cost-effective method using manganese nitrate hydrate and phosphoric acid in the presence of nitric acid with further calcinations at the temperature of 800 °C. The crystallite size obtained from X-ray line broadening is 31 ± 13 nm for the Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf>. The X-ray diffraction and SEM results indicated that the synthesized nanoparticles have only the structure without the presence of any other phase impurities. The FT-IR and FT-Raman spectra show characteristic bands of the P<inf>2</inf>O<inf>7</inf>4- anion. The UV-Vis-NIR spectrum confirms the octahedral coordination of Mn2+ ion. © 2009 Elsevier B.V. All rights reserved.
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Synthesis of new binary cobalt iron pyrophosphate CoFeP2O7
(2009-08-15)
Boonchom, Banjong
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Phuvongpha, Nart
A new binary cobalt iron pyrophosphate, CoFeP<inf>2</inf>O<inf>7</inf> was synthesized through solid phase reaction using cobalt carbonate, iron metal and phosphoric acid in the presence of water-methanol system with further calcinations at the temperature of 500 °C. The particle size obtained from X-ray line broadening is 36 ± 7 nm for the CoFeP<inf>2</inf>O<inf>7</inf>. FTIR spectrum of CoFeP<inf>2</inf>O<inf>7</inf> is assigned based on the P<inf>2</inf>O<inf>7</inf>4- ion in the structure. The XRD, UV-Vis near IR and FTIR results of the synthesized CoFeP<inf>2</inf>O<inf>7</inf> appear to be very similar to that of M<inf>2</inf>P<inf>2</inf>O<inf>7</inf> (M = Fe and Co), which indicates the monoclinic phase with space group C2/m. © 2009 Elsevier B.V. All rights reserved.
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A simple route to synthesize nickel ferrite (NiFe2O4) nanoparticles using egg white
(2007-05-01)
Maensiri, Santi
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Masingboon, Chivalrat
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Boonchom, Banjong
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Seraphin, Supapan
NiFe<inf>2</inf>O<inf>4</inf> nanoparticles were synthesized by a simple and cost-effective method using Ni and Fe nitrates and freshly extracted egg white (ovalbumin) in an aqueous medium. The X-ray diffraction and selected-area electron diffraction results indicated that the synthesized nanoparticles have only the inverse spinel structure without the presence of any other phase impurities. Room temperature magnetization results showed a ferromagnetic behavior of the NiFe<inf>2</inf>O<inf>4</inf> nanoparticles, with saturation-specific magnetization values in the range of 26.4-42.5 emu/g at 10 kOe. © 2006 Acta Materialia Inc.

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