Removal of diclofenac from water with calcined ZnAlFe-CO3 layered double hydroxides: Effect of contact time, concentration, pH and temperature

In this study, ZnAlFe-CO3 layered double hydroxide (LDH), with a Zn to (Al+Fe) molar ratio of 2 and an Al to Fe molar ratio of 1:1, was successfully synthesized and its calcined product (ZnAlFe-C) was obtained. The prepared adsorbents ZnAlFe-CO3 and ZnAlFe-C were characterized by FTIR, XRD, TGA/DTA...

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Bibliographic Details
Published in:Desalination and water treatment 2017-07, Vol.83, p.75-85
Main Authors: Ghemit, Rima, Boutahala, Mokhtar, Kahoul, Abdelkrim
Format: Article
Language:English
Subjects:
Adsorption
Capacity
Diclofenac
LDHs
Pharmaceutical
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Summary:In this study, ZnAlFe-CO3 layered double hydroxide (LDH), with a Zn to (Al+Fe) molar ratio of 2 and an Al to Fe molar ratio of 1:1, was successfully synthesized and its calcined product (ZnAlFe-C) was obtained. The prepared adsorbents ZnAlFe-CO3 and ZnAlFe-C were characterized by FTIR, XRD, TGA/DTA and BET textural analysis. Batch sorption studies were conducted to investigate adsorption of diclofenac from water onto both adsorbents. The results show that ZnAlFe-C can be used as an effective adsorbent and its sorption capacity is higher than that of ZnAlFe-CO3.The adsorption processes can be well described by the pseudo-second- order kinetic model. The adsorption data are fitted well with the Langmuir isotherm equation. The maximum adsorption capacity is 641.48 mg/g. The thermodynamic parameters were calculated. The negative ΔG0 and ΔH0 indicate that the adsorption processes are spontaneous and exothermic in nature.
ISSN:1944-3986
DOI:10.5004/dwt.2017.21031