ADSORPTION OF LEAD (II) AND CADMIUM (II) ON RAW AND MODIFIED DATE PITS BY TEMPO/NaBr/NaOCl AS ADSORBENT

作者：Oubekka Leila Daddi; Djelali Nacer Eddine^*; Chaleix Vincent; Gloaguen Vincent

来源：Romanian Journal of Chemistry, 2016, 61(3): 175-185.

• date pits
• heavy metals
• adsorption
• isotherms
• chemical modification

The principal objective of this study was to remove lead and cadmium on raw date pits (RDP) as adsorbent from wastewater. In order to improve the adsorption capacity of RDP, a chemical modification consisting in oxidation of primary alcohols with NaOBr catalyzed by TEMPO (2,2,6,6-tetramethylpiperidin-1-oxy) radical is investigated.
The experimental data of adsorption of lead and cadmium were correlated with the widely known isotherms models as Langmuir, Freundlich, Temkin and Dubin-Radushkevich, in order to know how each one fits the adsorption process. The raw powder and the modified one are characterized by FT-IR spectroscopy and the degree of oxidation is measured by conductimetry titration. The analysis of the modified-RDP by scanning electronic microscopy indicates the formation of compact structure and some porosities appear. Adsorption capacities were found better for lead than cadmium before and after the chemical modification.

• 出版日期2016-3