Chemical Papers

, Volume 72, Issue 4, pp 1031–1040 | Cite as

Photocatalytic efficiency of ZnAl-layered double hydroxide on degradation of a cationic dye under UV and solar radiation

  • Hassiba Bessaha
  • Charef Harrats
  • Mohamed Bouraada
  • Louis Charles Deménorval
Original Paper


UV and solar radiation photocatalytic degradation of basic dye Rhodamine B (RhB) using ZnAl-layered double hydroxide photocatalyst was investigated. ZnAl-layered double hydroxide (ZA4-HT) with a molar ratio of 4:1 was synthesized from zinc and aluminum salts by co-precipitation methods, followed by heat treatment at 500 °C (CZA4). Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) revealed that after heat treatment of ZA4-HT, the pristine structure collapsed resulting in ZnO particles and ZnAl2O4 spinel. The discoloration rate of RhB was lower than 8% through direct photolysis. The calcined ZA4-HT showed high photocatalytic efficiency with a discoloration rate of about 100% after 90 min exposure time to UV or sunlight radiation. The optimal catalyst loading was found to be 1 g/L and the discoloration time increased with the dye concentration. The photodiscoloration and the photodegradation kinetics data were described by pseudo-first-order and Langmuir–Hinshelwood models. The reusability study of the calcined material showed a stable efficiency after four successive uses.


Cationic dyes Langmuir–Hinshelwood model Layered double hydroxides Photocatalytic degradation UV irradiation ZnO particles 



The authors acknowledge help from the technical staff of Laboratory AIME-UMR, University Montpellier 2 (France) in XRD, SEM, BET, TG/DTA and FT-IR spectral measurements. This work was financially supported by the National Research Program (PNR). We would like to thank all the co-workers cited in the references below for their valuable contributions to the work described here.


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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2017

Authors and Affiliations

  • Hassiba Bessaha
    • 1
  • Charef Harrats
    • 2
  • Mohamed Bouraada
    • 1
  • Louis Charles Deménorval
    • 3
  1. 1.Laboratoire de valorisation des matériaux, Faculté des Sciences Exactes et de l’InformatiqueUniversité de MostaganemMostaganemAlgeria
  2. 2.Laboratoire de Chimie Appliquée (LAC)DGRSDT, Ctr Univ Bouchaib Belhadj Ain Temouchent BP/284Ain TemouchentAlgeria
  3. 3.ICG–AIME–UMR 5253, Université Montpellier 2Montpellier Cedex 05France

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