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Publication Metadata only Oxidative thermal conversion of hydrothermal derived precursors toward the mixed-metal cobaltite spinel oxides (Znco2o4 and nico2o4): In-situ investigation by synchrotron-radiation xrd and xas techniques(2021-10-01) Wanchai Deeloed; Yuranan Hanlumyuang; Wanwisa Limphirat; Songwut Suramitr; Kantapat Chansaenpak; Pongsakorn Kanjanaboos; Suttipong Wannapaiboon; Worawat Wattanathana; Kasetsart University; Mahidol University; Thailand National Science and Technology Development Agency; Synchrotron Light Research InstituteIn-situ investigations of structural transitions during the thermal-oxidative event of mixedmetal spinel oxide precursors, the so-called nickel-(NCO) and zinc-containing (ZCO) cobaltite spinel precursors, were investigated to understand... the formations of the derived NiCo2O4 and ZnCo2O4 spinel oxides, respectively. In-situ XRD investigation revealed that emerged temperatures for spinel oxide phase were between 325 and 400◦C, depending on the cationic substituent. It indicated that the emergedPublication Metadata only NiAl 2 O 4 spinel-type catalysts for deoxygenation of palm oil to green diesel(2018-08-01) Atthapon Srifa; Rungnapa Kaewmeesri; Cheng Fang; Vorranutch Itthibenchapong; Kajornsak Faungnawakij; Mahidol University; King Mongkut s University of Technology Thonburi; Thailand National Science and Technology Development Agency© 2018 Elsevier B.V. NiAl 2 O 4 spinel-type catalyst was successfully prepared by an incipient wetness impregnation method accompanied with high-temperature calcination at 1273 K for 10 h. The effect of reduction temperatures (773, 923, and 1073 K... degree at different temperatures. The TEM analysis revealed the formation of large particle size of the catalysts reduced at higher temperature. The highest product yield (94.3%) was achieved for the NiAl 2 O 4 reduced at 923 K. Interestingly, the spinelPublication Metadata only Enhancement of photocatalytic by Mn3O4 spinel ferrite decorated graphene oxide nanocomposites(2021-06-01) Tanawat Imboon; Jeerawan Khumphon; Khrongkhwan Yotkuna; I. Ming Tang; Sirikanjana Thongmee; Kasetsart University; Mahidol Universitybands from 250 to 550 nm. These bands arise from the d–d crystal field transitions of the tetrahedral Mn3+ species and indicate a distortion in the crystal structure. Photo-catalytic activity of spinel ferrite Mn3O4 NP’s by themselves was low but photo... with an interplanar d-spacing of 0.49 nm for (101) plane.2.Photocatalytic activity of spinel ferrite Mn3O4 nanoparticles by itself is low.3.Number of photoelectrons created depends on number of Mn3O4 on a given area of GO4.The bonding of the Mn3O4 to the GO sheetItem Metadata only Synergistic Effect of Zn Doping on the Structural, Optical, and Photocatalytic Properties of Sol–Gel Derived Spinel Ferrite for Tetracycline Photodegradation(2025-04-01) Nasir M.H.A.; Yasar M.; Khokhar A.M.; Fatima K.; Abbas M.; Ali M.; Mahmood F.; Almaary K.S.; Shah T.A.; Rao D.P.; Nasir M.H.A.; Mahidol University-doped spinel ferrite represents a significant advancement in the development of efficient recyclable photocatalysts for water treatment.Publication Metadata only Encapsulation of a powdery spinel-type Li+ion sieve derived from biogenic manganese oxide in alginate beads(2016-11-01) Paulmanickam Koilraj; Siwaporn Meejoo Smith; Qianqian Yu; Sarah Ulrich; Keiko Sasaki; Kyushu University; Mahidol University; Virginia Polytechnic Institute and State University© 2016 Elsevier B.V. A powdery lithium ion sieve (HMO) derived from biogenic birnessite was homogeneously integrated in sodium alginate (AL) beads. The composite beads were then characterized and their Li+adsorption properties were investigated. Scanning electron microscopy–energy dispersive spectroscopy analysis showed that the HMO particles were homogeneously dispersed in the AL beads even after drying. The adsorption isotherm of Li+adsorption to HMO encapsulated in AL beads (HMO–AL) was well fitted by the linear Langmuir model, and the beads showed a maximum adsorption capacity of 3.61 mmol/g based on HMO, which is comparable with the value of the original powdery HMO. Kinetic studies revealed that adsorption of Li+follows a pseudo-second-order model with rate constant k2 = 2.8–11.9 × 10− 3 g/(mmol min) for the initial Li+concentration range 2.56–4.23 mM. Diffusion of Li+from aqueous solution to the HMO particle through the Ca–AL network is the rate-limiting step for Li+adsorption to HMO–AL beads. The HMO-AL beads enhanced the handling efficiency for Li+adsorption and reused without significant reduction of Li+adsorption efficacy.Item Metadata only Effect of triethanolamine chelating agent on crystallinities, phase purities, and optical properties of zinc aluminate spinel synthesized by thermal decomposition(2022-03-15) Pipattanaporn P.; Pansiri P.; Kumpeerakij P.; Yaemphutchong S.; Siri-apai P.; Suetrong N.; Chansaenpak K.; Singkammo S.; Kanjanaboos P.; Hanlumyuang Y.; Wannapaiboon S.; Wattanathana W.; Mahidol UniversityZinc aluminates form a niche class of ceramics, which are useful in various applications, including photoelectronic devices, catalysts, and high efficacy optical materials. Selecting appropriate starting precursors is the key impertive to control synthetic parameters in ceramics syntheses for the improvement of phase purity and corresponding physicochemical properties. The current study reports the successful preparation of high crystallinity and purity of ZnAl2O4 via thermal decomposition of the metal complex precursor using triethanolamine (TEA) as the additive and chelating agent. The effects of calcination temperatures and the existence of TEA on the formation of the desired ZnAl2O4 and the suppression of ZnO impurity are thoroughly investigated. Herein, the correlation between the in-depth analysis of the thermal decomposition profile of the mixed metal-TEA precursor and the characteristic features of the obtained ZnAl2O4 product are highlighted. The variation of optical bandgap energy of the derived materials by controlling the structural defects via a variation of synthetic parameters is explored. The obtained results show strong evidence that the ZnAl2O4 powders derived from the thermal decomposition of the mixed metal-TEA precursor are superior in terms of crystallinity, phase purity, and optical properties to those without using the TEA chelating agent.Item Metadata only Catalytic transfer hydrogenation of furfural to furfuryl alcohol and 2-methylfuran over CuFe catalysts: Ex situ observation of simultaneous structural phase transformation(2022-06-15) Kalong M.; Srifa A.; Hongmanorom P.; Cholsuk C.; Klysubun W.; Ratchahat S.; Koo-amornpattana W.; Khemthong P.; Assabumrungrat S.; Kawi S.; Mahidol Universityphase of CuFe2O4 spinel-type structure was detected at 800 °C. To elucidate the structural CuFe transformation with catalytic transfer hydrogenation (CTH), the calcined catalysts were activated in situ into active species using isopropanolItem Metadata only Mechanistic insights and management approaches in photocatalytic degradation of tetracycline antibiotic using zinc ferrite nanoparticles(2025-01-01) Khokhar M.F.; Bangfan L.; Abbas M.; Yasar M.; Abrar A.; Shifeta N.T.; Alzahrani K.J.; Alsharif K.F.; Xusinovna D.M.; Urazbaeva D.; Khokhar M.F.; Mahidol UniversityZinc-doped ZnxCd0.8-XBa0.2Al0.2Fe1.8O4(X = 0, 0.2) spinel ferrite nanoparticles were synthesized via the sol–gel auto-combustion method and characterized by XRD, FTIR, SEM, EDX, BET