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RISS 인기검색어
- 검색키워드
- 저자 : Zambaga Otgonbayar (검색결과 2 건)
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Synthesis of NiO and TiO2 Combined SiC Matrix Nanocomposite and Its Photocatalytic MB Degradation
Zambaga Otgonbayar,Jun Hyeok Choi,Jo Eun Kim,Byung Jin Park,Won-Chun Oh 한국재료학회 2022 한국재료학회지 Vol.32 No.11
Interest in the use of semiconductor-based photocatalyst materials for the degradation of organic pollutants in a liquid phase has grown, due to their excellent performance and response to the light source. Herein, we fabricated a NiO-SiCTiO2 ternary structured photocatalyst which had reduced bandgap energy, with strong activation under UV-light irradiation. The synthesized samples were examined using XRD, SEM, EDX, TEM, DRS, EIS techniques and photocurrent measurement. The results confirmed that the two types of metal oxides were well bonded to the SiC fiber surface. The junction of the new photocatalyst exhibited a large number of photoexcited electrons and holes. The holes tended to oxidize the water and form a hydroxyl radical, which promoted the decomposition of methylene blue. The close contact between the 2D SiC fiber and metal oxide semiconductors expanded the scope of absorption wavelength, and enhanced the usability of the ternary photocatalyst for the degradation of methylene blue. Among three synthesized samples, the NiO-SiC-TiO2 showed the best photocatalytic effect, and was considered to have excellent photoelectron transfer due to the synergy effect between the metal oxide and SiC.
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Zambaga Otgonbayar,Kamrun Nahar Fatema,Md Nazmodduha Rafat,Jihyeon Ryu,양선혜,Ick-Jun Kim,Won Chun Oh 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.5
The goal of this study was to analyse the impact of a combination of a sub-active material (KMnO 4 ) with surface modifi cation to the activated carbon surface for enhanced cathode performance. Activated carbon with ultra-specifi c surface area (USAC, TCK-PBM, 2560.4 m 2 /g) was used for the preparation of our composite with potassium permanganate (KMnO 4 ). The physical characteristics of this As-treated USAC sample were analysed through XRD, SEM and EDX analysis. The XRD analysis was used to examine structural properties; surface analysis undertaken by SEM; EDX analysis was used to measure the metal content of the sample as well as the content after treatment with KMnO 4 . It was shown USAC treated with KMnO 4 had more than a 10.5 μg acidic group by the Boehm titration method. The electrochemical properties of KMnO 4 -USAC were investigated for varying electrolyte concentration (0.1, 0.5, 1.2 and 6 M) at ambient temperature (25 °C) and the electrode showed great electrochemical performance after ten cycles.
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