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( Seyed Majid Ghoreishian ),( Nilesh R. Chodankar ),허윤석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In the present work, rationally prepared carbon fiber (CF)-supported high-mass-loaded 2D-nanosheet-based MnO<sub>2</sub> (MnO<sub>2</sub>@CF, 6.6 mg/㎠) and MoS<sub>2</sub> (MoS<sub>2</sub>@CF, 7.2 mg/㎠) were used in a high-energy pseudocapacitor. These hierarchical 2D nanosheets yielded outstanding areal capacitances of 1187 and 495 mF/㎠ at high current densities with excellent cycling stability. Pliable all-pseudocapacitive solid-state asymmetric supercapacitor was designed using MnO<sub>2</sub>@CF and MoS<sub>2</sub>@CF as the positive and negative electrodes, respectively, with ultrahigh mass loading of 14.2 mg/㎠. The assembled solid-state asymmetric cell conveyed an energy density of 1.87 mWh/㎤ at a power density of 70 mW/㎤, and it showed capacitance retention of 92.25% over 11000 cycles and a very small diffusion resistance (1.72 Ω/s1/2). Thus, it is superior to most state-of-the-art reported pseudocapacitors.
( Seyed Majid Ghoreishian ),( Kugalur Shanmugam Ranjith ),허윤석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Transition metal dopants have been employed to decrease the band gap energy of TiO<sub>2</sub> for visible-light-driven photocatalysis. This study reports the synthesis of Fe/Sn co-doped TiO<sub>2</sub> (FS-TiO<sub>2</sub>) nanofibers and their supreme photocatalytic and photoelectrochemical activities under visible-light irradiation. The synthesized structure displayed a narrow band gap of 2.44 eV, suggesting their availability as a robust visible-light-driven photocatalyst for degradation of tetracycline (TC). In addition, FS-TiO<sub>2</sub> exhibited a catalytic activity that was about 2 and 20 times higher than that of un-doped TiO<sub>2</sub> and blank samples, respectively. Photoelectrochemical results demonstrated that the FS-TiO<sub>2</sub> had more effective charge separation and transportation from valance band to the conduction band than the compared with its counterparts. Moreover, the kinetic analysis demonstrated that the degradation of TC follows the Langmuir-Hinshelwood kinetic model.
( Seyed Majid Ghoreishian ),( Kugalur Shanmugam Ranjith ),허윤석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Heterogeneous photocatalysis has proven to be a promising approach to overcome the great challenges encountered with conventional technologies for environmental and energy issues.In this study, for the first time, a novel hierarchical architecture of nitrogen-doped TiO<sub>2</sub>@Bi<sub>2</sub>W0.5 Mo<sub>0.5</sub>O<sub>6</sub> (donated as NT@BWMO) was fabricated through an electrospinning process followed by a solvothermal process. The NT@BWMO showed significantly enhanced photocatalytic activity towards the degradation of tetracycline (TC) as compared to the pristine TiO<sub>2</sub> and the binary composites. The enhanced catalytic activity can be ascribed to the excellent native adsorption, enhanced light-harvesting region, hierarchical structure, and strong interfacial interaction between TiO<sub>2</sub> and BWMO. The kinetic analysis demonstrated that the degradation of TC follows the Langmuir-Hinshelwood kinetic model. Moreover, a possible photocatalytic mechanism underlying the degradation of TC by NT@BWMO is also proposed.
Ghoreishian, Seyed Majid,Kang, Sung-Min,Seeta Rama Raju, G.,Norouzi, Mohammad,Jang, Sung-Chan,Yun, Hyung Joong,Lim, Sung Taek,Han, Young-Kyu,Roh, Changhyun,Huh, Yun Suk Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.360 No.-
<P><B>Abstract</B></P> <P>Over the past two decades, the radiosynthesis of metallic nanoclusters (MNCs) using γ-irradiation (γ-radiosynthesis) has presented a wealth of opportunities for the application of nanomaterials in areas such as medicine, energy, catalysis, and sensors. Unlike conventional methods, this technique provides fully reduced and highly stable MNCs that are free from by-products or impurities. γ-Radiosynthesis has thus proven to be a clean and green approach for bulk fabrication of MNCs with tunable particle sizes and morphologies. More recently, the <I>in-situ</I> decoration of MNCs on support materials using γ-irradiation has attracted much attention due to the synergistic effect between MNCs and the underlying support. In this review, we discuss the current state of research into the mechanisms underlying the γ-radiosynthesis of supported and unsupported mono- and bi-metallic nanoclusters and summarize the use of MNCs in catalysis, sensing, biomedicine, and energy applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Impressive advantages of the γ-radiosynthesis of metal nanoclusters (MNCs) over the conventional methods are presented. </LI> <LI> Experimental parameters for the γ-radiosynthesis of highly pure and fully reduced MNCs are discussed. </LI> <LI> The available γ-radiosynthesized MNCs reports have been extensively reviewed. </LI> <LI> Applications of γ-radiosynthesized MNCs in various technological fields are evaluated. </LI> <LI> The synergistic effect between γ-radiosynthesized MNCs and supporting materials are stated. </LI> </UL> </P>
오철우,( Seyed Majid Ghoreishian ),허윤석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The development of effective photocatalyst for the decomposition of a broad spectrum of pollutants is of great importance in environmental realm. In this study, nickel molybdate(NiMoO<sub>4</sub>) with different crystallinephase and morphologies were synthesized via a surfactant-assisted hydrothermal reaction method. The photocatalytic degradation of the Reactive Yellow160,as bio-resistant water pollutant, was conducted to investigate the photocatalytic properties of various morphologies of NiMoO<sub>4</sub> samples. The NiMoO<sub>4</sub> with α-phase crystal structure and rod-like morphology exhibited 2times higher photocatalytic activity as compared to other synthesized morphologies and 1.5times higher photocatalytic efficiency than that of commercial nano-ZnO. Furthermore, kinetic analysis confirmed that the degradation of above-mentioned dye follows the Langmuir-Hinshelwood kinetic model. Thus,this study unveils that α-NiMoO<sub>4</sub> with rod-like morphology is a promising photocatalyst for environmental applications.
오철우,( Seyed Majid Ghoreishian ),허윤석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The search for high-efficient photocatalyst for decontamination of organic pollutants from wastewater or natural water remains a great challenge. In this study, a new photocatalyst consisting of reduced GO/CdWO<sub>4</sub>composite was synthesized by a wet chemical process and utilized for the degradation of a naphthacene-based antibiotic (tetracycline( TC))under solar-light exposure. The Box-Behnken four-level experimental design was employed to find the maximum yield of photocatalytic degradation and optimize the process variables. The synthesized hierarchical structure showed a narrow band gap of 2.46 eV, indicating their availability as a robust visible-light-driven photocatalyst for degradation of conjugated aromatic compounds.The optimal conditions for the complete TCdegradation are found to be: irradiation time:60 min, catalyst dosage of 0.216 g L<sup>-1</sup>, [TC]0 of 13.54 mg L<sup>-1</sup>, and pH5.8. The kinetic analysis confirmed that the degradation of TC follows the Langmuir-Hinshelwood kinetic model.
최남혁,( Seyed Majid Ghoreishian ),( Ganji Seeta Rama Raju ),( Kugalur Shanmugam Ranjith ),이후민,곽철환,박범준,한영규,허윤석 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Well-designed heterostructure photocatalysts with effective interfacial contacts have attracted significant attention, owing to their enhanced visible-light absorption and optimal charge separation efficiency. Herein, novel visible-light-responsive heterostructure photocatalysts composed of reduced graphene oxide (rGO)/protonated g-C3N4 (p-CN)/ Cu3Mo2O9 (CMO) were constructed through a facile hydrothermal method. In particular, the ternary composite with 20 wt% of CMO content (rGO/p-CN/CMO-20) was optimized as an efficient catalyst for tetracycline (TC) degradation. The TC degradation rate of the rGO/ p-CN/CMO-20 catalyst was found to be ~41, 15, 22, 7, and 14 times higher than those of rGO, p-CN, CMO, p-CN/CMO-20, and rGO/ CMO-20, respectively.