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RISS 인기검색어
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- 저자 : Chechia Hu (검색결과 2 건)
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Chechia Hu,Zhi-Ting Liu,Kun-Yi Andrew Lin,Wei-Han Wei,Ke-Hsuan Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
To prepare g-C3N4 for photocatalytic tetracycline (TC) removal, KCl was employed to mix with or cover thetop of the precursors, namely, melamine and urea. The mixing of KCl with the precursor will result in theincorporation of KClwithin the layer structure of g-C3N4, whereas KCl covering the top might not have suchan effect. Different precursor ratios contributed to the formation of heptazine-rich or triazine-rich units inthe g-C3N4 structure. Melamine applied alone as a precursor will undergo a phase transformation intomelam and triazine-rich g-C3N4, whereas with the addition of urea, the mixture will polymerize to formmelem and heptazine-rich g-C3N4. The KCl-incorporated, heptazine-rich g-C3N4 (KCN80m) exhibited animproved photocatalytic activity for TC removal (greater than 80% during a 120-min period for 50 mL ofa 20-ppm TC solution). The enhanced activity can be attributed to the improved charge separation throughan electron and hole transfer through the K+ and Cl- sites, respectively; the formation of a nanojunctionbetween the triazine and heptazine units of g-C3N4; an increased number of photoexcited electrons, indicatedby the electron paramagnetic resonance spectroscopy results.Wevaried the mixing conditions of KCland precursor ratio to synthesize different KCl-incorporated heptazine-rich g-C3N4 samples for effectiveremoval of TC from water through photocatalysis.
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Synergistic effect of Cu and Ru decoration on g-C3N4 for electrocatalytic CO2 reduction
Chechia Hu,Miao-Ting Liu,Arisu Sakai,Masaaki Yoshida,Kun-Yi Andrew Lin,Chun-Chieh Huang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Electrocatalytic CO2 reduction is an emerging approach for the reduction of CO2 in a feasible, green, andeffective manner. In this study, bimetallic compounds of Cu and Ru were both decorated onto ap-conjugated g-C3N4 surface (CuxRuyCN), which functioned as an electrode for electrochemical CO2reduction. From the X-ray photoelectron and X-ray absorption spectra, Cu and Ru on CuxRuyCN wereidentified as the oxidative states of CuO/Cu2O and RuO2, respectively. The mixed states of CuO andCu2O served as active sites to both adsorb and activate CO2 for effective reduction, while RuO2synergistically served as the hole-enrichment center and transferred H protons to promote CO2 reduction. Consequently, the electrochemical current density of CuxRuyCN was significantly enhanced comparedwith the corresponding densities of CN or Cu-doped CN. The current density of CuxRuyCN reduced to lessthan 0.05 mA cm2 at an applied voltage of 1.5 V in an air or Ar atmosphere, indicating that the highcurrent density of CuxRuyCN was associated with the flow of CO2 and its reduction. Moreover, the currentdensity of CuxRuyCN was maintained at approximately 0.3 mA cm2 for at least 2000 s at an appliedvoltage of 1.4 V (vs Ag/AgCl), indicating its high stability during CO2 reduction. In summary, both Cuand Ru-modified g-C3N4 samples used to produce CuO/Cu2O- and RuO2-decorated g-C3N4 acted as effectivecatalysts for electrocatalytic CO2 reduction and demonstrated several potential electrochemicalapplications.
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