Browsing by Author "Winadda Wongwiriyapan"

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    Dependence of MWCNT production via co-pyrolysis of industrial slop oil and ferrocene on growth temperature and heating rate
    (2020-09-01) Weerawut Chaiwat; Napat Kaewtrakulchai; Pimpage Sangsiri; Apiluck Eiad-ua; Winadda Wongwiriyapan; Nawin Viriya-empikul; Komkrit Suttiponpanit; Tawatchai Charinpanitkul; PTT Public Company Limited; Chulalongkorn University; King Mongkut's Institute of Technology Ladkrabang; Thailand National Nanotechnology Center; Mahidol University; Research Network of NANOTEC-KU on Nanocatalyst and Nanomaterials for Sustainable Energy and Environment
    © 2020 Elsevier B.V. Multi-walled carbon nanotubes (MWCNTs) could be produced from industrial slop oil via pyrolysis with the presence of ferrocene. Dependence of characteristics of the produced MWCNTs on their growth temperature and heating rate of mixtures of industrial slop oil and ferrocene was experimentally investigated. With low-molecular weighted hydrocarbon, the resultant MWCNTs with nominal diameters of 10–50 nm and yields of 45–65 wt% could be produced within a growth temperature range of 750–950 °C. Meanwhile, high-molecular weighted hydrocarbon could provide substantial yield of MWCNTs only within the growth temperature range of 850–950 °C. It was found that a higher heating rate of 9 °C/min could result in preferable production of MWCNTs with higher purity. Based on comprehensive analyses, a schematic pathway of MWCNT production via co-pyrolysis of mixtures of industrial slop oil and ferrocene was proposed.
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    Present advancement in production of carbon nanotubes and their derivatives from industrial waste with promising applications
    (2017-01-01) Konrat Kerdnawee; Chompoopitch Termvidchakorn; Pacharaporn Yaisanga; Jirapat Pakchamsai; Cheewapon Chookiat; Apiluck Eiad-Ua; Winadda Wongwiriyapan; Weerawut Chaiwat; Sakhon Ratchahat; Kajornsak Faungnawakij; Komkrit Suttiponparnit; Tawatchai Charinpanitkul; Chulalongkorn University; King Mongkut's Institute of Technology Ladkrabang; Mahidol University; Tokyo Institute of Technology; Thailand National Science and Technology Development Agency; PTT
    © 2017 The Authors. 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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    Sensitivity Enhancement of Benzene Sensor Using Ethyl Cellulose-Coated Surface-Functionalized Carbon Nanotubes
    (2018-01-01) Thanattha Chobsilp; Worawut Muangrat; Chaisak Issro; Weerawut Chaiwat; Apiluck Eiad-Ua; Komkrit Suttiponparnit; Winadda Wongwiriyapan; Tawatchai Charinpanitkul; PTT Public Company Limited; Shinshu University; Chulalongkorn University; King Mongkut's Institute of Technology Ladkrabang; Mahidol University; Burapha University
    © 2018 Thanattha Chobsilp et al. A hybrid sensor based on the integration of functionalized multiwalled carbon nanotubes (MWCNTs) with ethyl cellulose (EC) was fabricated for sensitivity enhancement of benzene detection. To functionalize the surface of MWCNTs, MWCNTs were treated with hydrochloric acid for 60 min (A60-MWCNTs), while other MWCNTs were treated with oxygen plasma for 30, 60, 90, and 120 min (P30-MWCNTs, P60-MWCNTs, P90-MWCNTs, and P120-MWCNTs, resp.). Pristine MWCNTs, A-MWCNTs, and P-MWCNTs were dispersed in 1,2-dichloroethane, then dropped onto a printed circuit board consisting of Cu/Au electrodes used as the sensor platform. Next, EC was separately spin coated on the pristine MWCNTs, A-MWCNTs, and P-MWCNTs (EC/MWCNTs, EC/A-MWCNTs, and EC/P-MWCNTs, resp.). All sensors responded to benzene vapor at room temperature by increasing their electrical resistance which was sensitive to benzene vapor. The EC/P90-MWCNTs enabled an approximately 11-fold improvement in benzene detection compared to EC/MWCNTs. The sensitivity of all sensors would be attributed to the swelling of EC, resulting in the loosening of the MWCNT network after benzene vapor exposure. The differences of the sensing responses of the EC/MWCNTs, EC/A-MWCNTs, and EC/P-MWCNTs would be ascribed to the differences in crystallinity and functionalization of MWCNT sidewalls, suggesting that acid and oxygen plasma treatments of MWCNTs would be promising techniques for the improvement of benzene detection.