XU Min-hong, PAN Guo-xiang*, CHEN Hai-feng, WU Tao, GUO Yu-hua

(Department of Materials Engineering, HuzhouUniversity, Huzhou 313000, China)

Abstract: Zn3M-CO3-LDHs, where M is Al, Cr and Fe, layered double hydroxides with Zn/metal atomic ratio of 3:1 and CO32- as the interlayer anion are synthesized by co-precipitation method. The structures and properties of Zn3M-CO3-LDHs are characterized by powder X-ray diffraction (XRD), infrared spectrum (FT-IR), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS) and thermogravimetry differential thermal analysis (TG-DTA). Results indicate Zn3M-CO3-LDHs with regular structure and single crystal phase, so Zn3M-CO3-LDHs have typical layered structure of layered double hydroxides intercalated with carbonate. Absorption range of Zn3Cr-CO3-LDHs in the visible region is the widest, compared with the other two layered double hydroxides. The order of thermal stability is Zn3Cr-CO3-LDHs＞Zn3Al-CO3-LDHs＞Zn3Fe-CO3-LDHs. Photocatalytic activities of Zn3M-CO3-LDHs are studied under Rhodamine B as the research object. Results show that three kinds of Zn3M-CO3-LDHs are effective in degradation of Rhodamine B, and degradation rate of Rhodamine B with Zn3Cr-CO3-LDHs reaches 95.8% after 70 min, and the photocatalytic effect is the best. For the more, degradation rates with Zn3Al-CO3-LDHs and Zn3Fe-CO3-LDHs are higher than 84%, with similar photocatalytic effects. In addition, degradation kinetics can be described by the first-order kinetic function, and the order of reaction rate constant is Zn3Cr-CO3-LDHs＞Zn3Al-CO3-LDHs＞Zn3Fe-CO3-LDHs.

Keywords: Layered double hydroxides; Co-precipitation method; Photocatalytic; Rhodamine B

E-mail: pgxzjut@163.com

ACTA MINERALOGICA SINICA Vol. 37, No. 4, 2017, Page 395-400