Pengfei Zhu,Shuang Qin,Mengrong Geng,Heyang Cao,Zhiliang Jin,Chuanyi Wang
Photocatalytic NO removal technology is considered as one of the most effective green methods for reducing atmospheric NO but there remains the problems of lower efficiency and poor stability of photocatalysts . Rapid recombination of photogenerated electron (e − ) and holes (h + ) is known as a key issue that causes low activity and poor stability of catalysts. Herein, we report a novel AgCu@UiO-66-NH 2 photocatalyst (AgCu@UN) that is made up of AgCu alloy on the surface of Zr-MOF (UiO-66-NH 2 ) by employing in-situ photodeposition method. The experimental results of photocatalytic NO removal indicated that the optimized 0.5Ag0.5Cu@UN sample with 0.5 mg of Ag and Cu exhibited the best NO removal efficiency of 63 % for ppb-level atmospheric NO, more higher than that of pure UiO-66-NH 2 (38 %). The characterizations suggested that the excellent photocatalytic performance of 0.5Ag0.5Cu@UN can be ascribed to the efficient charge separation and transfer and the visible-light-harvesting ability due to benefiting electron migration process between AgCu alloys and UN. Moreover, the enriched electrons around AgCu could be transferred to O 2 to generate more superoxide radicals (•O 2 − ), which could oxidize NO to the final product, nitrate (NO 3 − ). The present findings can provide some novel insights for the design of efficient MOF based photocatalysts to eliminate low concentrations of NO X .
Yumei Peng,Lixia Qin,Jiefei Liu,Shi-Zhao Kang,Guodong Li,Xiangqing Li
Here, by a simple one-step in situ chemical reduction method, the Ag x Cu y alloy was tailored on the surface of mesoporous TiO 2 (M-TiO 2 ), therefore, a series of bi-functional mesoporous TiO 2 nanohybrids (M-TiO 2 /Ag x Cu y ) for both surface enhanced Raman scattering (SERS) detection and photocatalytic degradation of ampicillin (AMP) were achieved. The composition and structure of the nanohybrids were well characterized using XRD, TEM, XPS and HRTEM-EDS measurements. Results indicated that Ag x Cu y alloy was mainly attached around the pores of M-TiO 2 which may generate more active sites than nonporous P25−Ag−Cu. Thus, the M-TiO 2 /Ag x Cu y nanohybrids could be used as efficient SERS substrates to sensitively monitor the AMP in water with lower detection limit (˜ 1 ppt) than P25−Ag−Cu. Besides, the M-TiO 2 /Ag 3 Cu 1 nanohybrid also showed higher photocatalytic activities for the degradation of AMP under UV irradiation over the M-TiO 2 /Ag, the M-TiO 2 /Cu and the P25−Ag−Cu. This work provided a simple and effective approach to synthesize bi-functional nanohybrids for detection and degradation of organic contaminants in wastewater.
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