A facile and novel construction of attapulgite/Cu₂O/Cu/g-C₃N₄ with enhanced photocatalytic activity for antibiotic degradation

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• 作者：Shixiang Zuo^a ; Yao Chen^a ; Wenjie Liu^a ; Chao Yao^a ; ^{yaochao420@163.com} ; Xiazhang Li^a ; Zhongyu Li^a ; Chaoying Ni^b ; Xiaoheng Liu^c ; ^{xhliu@mail.njust.edu.cn}
• 关键词：One-pot redox ; Z-scheme ; Photocatalytic activity ; Antibiotic degradation
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：43
• 期：3
• 页码：3324-3329
• 全文大小：1263 K
• 卷排序：43

文摘

A high-performance photocatalyst, attapulgite/Cu2O/Cu/g-C3N4 (ATP/Cu2O/Cu/g-C3N4), was constructed via a one-pot redox strategy under anoxic calcination. The as-prepared composites were characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms (BET), photoluminescence emission (PL), and electrochemical impedance spectra (EIS). Results indicate that ultra-fine CuO nanoparticles on the surface of rod-like attapulgite are in-situ reduced by NH3 gas to generate Cu and minority Cu2O during the pyrocondensation of melamine. Meanwhile, the generated g-C3N4 membrane is uniformly encapsulated on the surface of attapulgite/Cu2O/Cu to assemble Z-scheme Cu2O/Cu/g-C3N4 heterostructure. ATP/Cu2O/Cu/g-C3N4 shows improved visible light response ability and hole-electron suppression compared with ATP/g-C3N4. The photocatalytic performance and mechanism of the obtained photocatalyst for antibiotic degradation were evaluated by UV–Vis spectrometer and liquid chromatograph. ATP/Cu2O/Cu/g-C3N4 can exhibit favorable photocatalytic activity and reusability for chloramphenicol. In addition, h+ and·OH radicals are the main active sites in the photocatalytic process, and Cu species play a vital role in separation and retarding recombination of electron-hole pairs.