title: [Preparation and characterization of Zn/Cr-LDHs and their removal performances of reactive brilliant orange X-GN].
abstract: Zn/Cr-LDHs with cationic ratios of 1:1 to 1:5 were prepared using the co-precipitation method. After preparation of the layered double hydroxides, 2:1 Zn/Cr-LDHs were calcined at 300, 400 and 500 degrees C in a Muffle furnace for 2 h. The obtained mixed oxides are also called calcined layered double hydroxides (Zn/Cr-LDO). Structures of the obtained materials were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, atomic absorption spectrometry and BET analysis. Experiments were then carried out to investigate the removal of reactive brilliant orange X-GN by 2:1 Zn/Cr-LDHs and Zn/Cr-LDO under ultraviolet light and in dark conditions. The results showed that the removal capacity of 2:1 Zn/Cr-LDHs was not affected by ultraviolet light. Under the irradiation of ultraviolet light, the removal rate of reactive brilliant orange X-GN by Zn/Cr-LDO was twice as high as that in dark conditions, which demonstrated its photocatalysis property and its removal of reactive brilliant orange X-GN by the combined action of absorption and photocatalysis.
authors.affiliation: Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Ministry of Education, College of Environmental Science and Engineering, Suoth China University of Technology, Guangzhou 510006, China. xiaorong0911@163.com
authors.forename: Xiao-Rong
authors.initials: XR
authors.lastname: Wang
authors.forename: Ping-Xiao
authors.initials: PX
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification*; D002384:Catalysis; D002857:Chromium / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D006878:Hydroxides / Q000138:chemical synthesis / Q000737:chemistry*; D055668:Photochemical Processes; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014865:Waste Disposal, Fluid / Q000379:methods*; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D006878:Hydroxides; D002857:Chromium; D015032:Zinc