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Water 2018, 10(9), 1257;

Formation of Palygorskite Clay from Treated Diatomite and its Application for the Removal of Heavy Metals from Aqueous Solution

Laboratory of Materials, Molecules and Applications, IPEST, Preparatory Institute of Scientific and Technical Studies of Tunis, University of Carthage, SidiBou Said road, B.P. 512070, La Marsa 1054, Tunisia
Chemistry Department, Faculty of Sciences of Tunis, El Manar University, B.P. 248, El Manar II, Tunis 2092, Tunisia
Biorefinery Processes Research Group, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Plaza. Europa1, 20018 Donostia-San Sebastian, Spain
Author to whom correspondence should be addressed.
Received: 13 August 2018 / Revised: 10 September 2018 / Accepted: 12 September 2018 / Published: 15 September 2018
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Environmental contamination by toxic heavy metals is a serious worldwide phenomenon. Thus, their removal is a crucial issue. In this study, we found an efficient adsorbent to remove Cu2+ and Ni2+ from aqueous solution using two materials. Chemical modification was used to obtain palygorskite clay from diatomite. The adsorbents were characterized using X-ray florescence, Fourier transform infrared spectroscopy and X-ray diffraction. The effects of contact time, initial concentration, temperature and pH on the adsorption process were investigated. Our results showed that the (%) of maximum adsorption capacity of diatomite was 78.44% for Cu2+ at pH 4 and 77.3% for Ni2+ at pH 7, while the (%) of the maximum adsorption on palygorskite reached 91% for Cu2+ and 87.05% for Ni2+, in the same condition. The results indicate that the pseudo-second-order model can describe the adsorption process. Furthermore, the adsorption isotherms could be adopted by the Langmuir and the Freundlich models with good correlation coefficient (R2). Thus, our results showed that palygorskite prepared from Tunisian diatomite is a good adsorbent for the removal of heavy metals from water. View Full-Text
Keywords: palygorskite clay; diatomaceous earth; heavy metals; adsorption capacity palygorskite clay; diatomaceous earth; heavy metals; adsorption capacity

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Nefzi, H.; Abderrabba, M.; Ayadi, S.; Labidi, J. Formation of Palygorskite Clay from Treated Diatomite and its Application for the Removal of Heavy Metals from Aqueous Solution. Water 2018, 10, 1257.

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