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Yunxue Xiao,Abulikemu Abulizi,Kenji Okitsu,Tiezhen Ren 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
The use of photocatalysts on semiconductor substrates is a promising strategy for multiple use of solarenergy and environmental improvement to convert CO2 to CH3OH. In this paper, a series of SnO2-modified BiOI (SnO2/BiOI) novel s-scheme heterojunction microsphere catalysts were synthesized, andthe effect of temperature on the photocatalytic CO2 reduction reactivity of SnO2 grown on pure BiOI surfacewas systematically investigated by adjusting the calcination reaction temperature. Among all SnO2/BiOI composite photocatalytic systems, the highest CH3OH yield (1183 lmol/gcat, 4 h) was achieved whenSnO2/BiOI was synthesized at 400 C, which was 2.7 times higher than that of BiOI alone (437 lmol/gcat,4 h). The SnO2/BiOI microspheres with s-scheme heterojunction exhibited surprising photocatalytic performancefor CH3OH formation due to the formation of an internal eletricfield between SnO2 and BiOI alsofacilitated the separation of the photogenerated electron-hole pairs.
Hongyu Fu,Tao Zhang,Abulikemu Abulizi,Kenji Okitsu,Yalkunjan Tursun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
It is pressing to explore highly efficient and broad-spectrum photocatalysts to address environmentalissues. In this work, in situ self-assembled hollow BiOIxCly n-n type heterojunction microspheres weresimply synthesized via a one-step hydrothermal method, and the microstructure, morphology, optical,photoelectrochemical, and photocatalytic properties of the samples were researched. The photocatalyticactivity of materials was investigated for Rhodamine B (RhB) degradation and CO2 reduction. The characterizationresults illustrated that the introduction of moderate amounts of Cl in BiOI could promotethe conversion of RhB and CO2, and it improved separation efficiency of photogenerated electrons andholes in BiOI. Specially, when the doping ratio of I and Cl was 2:1, BiOIxCly exhibited the most outstandingphotocatalytic activity for RhB degradation (99.42 %, 20 min) and reduction of CO2 to methanol(1042.12 lmol/gcat, 8 h) and ethanol (264.53 lmol/gcat, 8 h), which were approximately 3.40 and 3.91-times larger than that of BiOI, respectively. This study could describe a potential strategy for assistingwith environmental purification and energy transformation.
Satoshi Seino,Takuya Kinoshita,Yohei Otome,Takashi Nakagawa,Kenji Okitsu,Tadachika Nakayama,Tohru Sekino,KoichiNiihara,Takao A. Yamamoto 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2
Nanocomposite particles composed of gold and iron oxide were synthesized with various ratios of gold and iron oxide in an aqueous phase using γ-rays. Iron oxide nanoparticles of γ-Fe2O3 or Fe3O4 were used as a magnetic phase on which gold nanoparticles with average diameters of 5-10 nm were supported. The efficiency of magnetic separation of biomolecules by the present nanocomposite particles was investigated using glutathione as a model compound. The amount of glutathione magnetically separated was significantly enhanced by the supported gold nanoparticles.