Browsing by Author "Komkrit Suttiponpanit"

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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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    Efficient mercury removal at ultralow metal concentrations by cysteine functionalized carbon-coated magnetite
    (2020-11-02) Assadawoot Srikhaow; Teera Butburee; Weeraphat Pon-On; Toemsak Srikhirin; Kanchana Uraisin; Komkrit Suttiponpanit; Suwilai Chaveanghong; Siwaporn Meejoo Smith; PTT Public Company Limited; Kasetsart University; Thailand National Nanotechnology Center; Mahidol University; Center of Sustainable Energy and Green Materials and Department of Chemistry
    © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This work reports the preparation and utility of cysteine-functionalized carbon-coated Fe3 O4 materials (Cys-C@Fe3 O4) as efficient sorbents for remediation of Hg(II)-contaminated water. Efficient removal (90%) of Hg(II) from 1000 ppb aqueous solutions is possible, at very low Cys-C@Fe3 O4 sorbent loadings (0.01 g sorbent per liter of Hg(II) solution). At low metal concentrations (5–100 ppb Hg(II)), where adsorption is typically slow, Hg(II) removal efficiencies of 94–99.4% were achievable, resulting in final Hg(II) levels of <1.0 ppb. From adsorption isotherms, the Hg(II) adsorption capacity for Cys-C@Fe3 O4 is 94.33 mg g−1, around three times that of carbon-coated Fe3 O4 material. The highest partition coefficient (PC) of 2312.5 mgg−1 µM−1 was achieved at the initial Hg (II) concentration of 100 ppb, while significantly high PC values of 300 mgg−1 µM−1 and above were also obtained in the ultralow concentration range (≤20 ppb). Cys-C@Fe3 O4 exhibits excellent selectivity for Hg(II) when tested in the presence of Pb(II), Ni(II), and Cu(II) ions, is easily separable from aqueous media by application of an external magnet, and can be regenerated for three subsequent uses without compromising Hg(II) uptake. Derived from commercially available raw materials, it is highly possible to achieve large-scale production of the functional sorbent for practical applications.