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박범준,( Kugalur Shanmugam Ranjith ),허윤석,한영규 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Self-designed core-shell form of TiO<sub>2</sub>-SnS<sub>2</sub> nanofibers are fabricated by electrospinning process followed by the sulfidation under hydrothermal process. The in-situ process of Ti and Sn pressures with PVP were spun as nanofibers under high voltage and through the thermal decomposition, the as-spun fibers were constructed as TiO<sub>2</sub> core fibers with the SnO<sub>2</sub> shell wall. With the function of high electronegativity and high surface area, TiO<sub>2</sub>-SnS<sub>2</sub> nanofibers were extracted the Cr<sup>3+</sup> results from the Cr(VI) reduction.The ATR-FTIR results induced the effective reduction rate of Cr(VI) were possibly due to the protoncoupled electron transfer process. The self-designed SnS<sub>2</sub> shell wall on TiO<sub>2</sub> has promotes the photo adsorption on the catalytic surface and effectively separate the photogenerated charge carriers. This strategy induces the facial route to construct the visible active core-shell nanofibers, which can be used as a photocatalyst, and water purification applications.
박범준,( Kugalur Shanmugam Ranjith ),허윤석,한영규 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
We fabricate the free-standing MoS2 decorated electrospun carbon nanofibrous web as an active electrode surface with surface loaded PANI nanostructures through the hydrothermal synthesis followed by the polymerization process. Controlling the PANI growth on the hierarchical MoS<sub>2</sub> nanoflakes on the carbon fibrous surface promotes the capacitive performances with high durable stability. The optimized 3D network of PANI/MoS<sub>2</sub>/CNFs expresses the high capacitance of 643.6 F g-1 at the 0.5 A g-1 with excellent rate capability of 85.3% from 0.5 to 20 A g-1. On constructing the free-standing symmetric supercapacitor devices has delivered the excellent rate performances with good cycling stability. The 3D fibrous device has resulted in the specific capacitance of 124.7 F g-1 at the current density of 1 A g-1 and has the cycling stability with the 82.1% retention after 5000 cycles at 5 A g-1.
최남혁,( Seyed Majid Ghoreishian ),( Kugalur Shanmugam Ranjith ),이후민,한영규,허윤석 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Heterogeneous photocatalysis has been proven to be a promising approach to overcome the great challenges encountered with conventional technologies for environmental remediation. Herein, for the first time, a novel hierarchical architecture of nitrogen-doped TiO<sub>2</sub>@ Bi<sub>2</sub>W<sub>x</sub>Mo<sub>1-x</sub>O<sub>6</sub> (N-T@BWMO-x, x=0-1.0) was rationally designed and fabricated through an electrospinning route followed by a solvothermal process. The photocatalytic activity of the as-prepared samples was evaluated based on the degradation of tetracycline hydrochloride (TC) under visible-light irradiation. The results indicated that the molar fraction of W/Mo has a strong impact on the photocatalytic efficiency and photoelectrochemical performance of the N-T@BWMO composites. Compared to N-TiO<sub>2</sub> and the binary composites, N-T@BWMO-0.25 exhibited outstanding photocatalytic activity and significant cycling stability.
( 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.
박범준,김수헌,곽철환,Kugalur Ranjith Shanmugam,한영규,조영진,허윤석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
In this work, we fabricate porous cesium lead bromide nanofibers (CsPbBr3 NFs) via electrospinning andemploy them in a sensor to effectively detect both gaseous and aqueous ammonia. The CsPbBr3 NFs areproduced byfirst mixing cesium lead bromide nanocrystals (CsPbBr3 NCs) with polystyrene (PS),followed by solidifying the mixture into NFs using electrospinning. Porous NFs are modified using thevolatile solvent toluene, which is volatilized during the electrospinning process. The applicability of theproposed CsPbBr3 NFs for use under various environmental conditions is verified by analyzing theirstability in response to changes in temperature, moisture level and pH, which are critical drawbacks ofCsPbBr3 NCs. Gaseous ammonia (9 mg L 1) in an N2 carrier is subsequently detected using thephotoluminescence (PL) properties of the CsPbBr3 NFs. In addition, an ammonia concentration of 100.0mg L 1 in an aqueous solution can be detected using the PL intensity. Therefore, we believe that theproposed CsPbBr3 NFs show significant promise for use in detection sensors to assess the extent of fooddecay, allowing customers to purchase fresh agricultural products more safely.
( 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.
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.