Polyphenols Content, Chelating Properties and Adsorption Isotherms and Kinetics of Red and Yellow Pomegranate Peels (<i>Punica granatum</i> L.) Towards Lead (II)

Abstract

Metal pollutants produced by industrial wastewaters have become a global concern given their impact on the environment and human health. The purpose of this study was to assess the polyphenols content and the iron chelating activity in the peels of two pomegranate varieties. After the biomass characterization via FT-IR, point of zero charge and surface functional groups analysis, the lead adsorption was then investigated by batch method. Finally, the regeneration of the biomasses was performed by acidic desorption. Polyphenols content of the red peels extract was higher than the yellow one; 102.9±0.9 and 85.9±1.3 mg GAE/g of dry weight, respectively with a half iron chelation inhibitory concentration (IC 50 ) of 227.2±1.7 and 235.9±3.2 µg.mL -1 of extract, successively. For the adsorption isotherms of lead onto the red and yellow pomegranate peels, the Langmuir model was more fitting with an adsorption capacity (Q max ) of 90 and 89.25 mg.g -1 , respectively. The kinetic data corresponded better to the pseudo-second order model. The acidic desorption of lead was successful with a high percentage of recovery. The results demonstrate the effectiveness of these biomasses as biosorbents for lead removal from aqueous solutions with the possibility of their reuse.

Fast and Selective Adsorption of Au (III) from the Waste Printed Circuit Boards Using a Low-Cost Adsorbent: Optimization by Central Composite Design Based on Response Surface Methodology

“…Tis measurement provides evidence on considerable quantities of phenolic compounds in the pomegranate peel that have two major components, carbon and oxygen, in their structure. Te TPC of the two types of pomegranate peel was reported to be 102.9 ± 0.9 and 85.9 ± 1.3 mg GAE/g DW [31]. Several studies have found pomegranate peel to be rich in phenolic compounds [32][33][34][35][36][37].…”

“…Te peaks in the narrow area of 1390−1310 cm −1 are associated with O-H phenolic bending. Te peaks at 1232 and 1033 cm −1 display the stretching vibrations of the carbonyl group (C-O) [3,4,31]. Tese data confrm that the pomegranate peel is rich in phenolic compounds which have carbon and oxygen as their two main elements.…”

A new tannin-based adsorbent synthesized for rapid and selective recovery of palladium and gold: Optimization using central composite design

“…1 shows the FT-IR spectra of (a) tannin-rich pomegranate peel powder and (b) PT-ED. The wide peaks at 3600-3100 cm −1 show the stretching vibration of the O─H group of phenolic [ [27] , [28] , [29] , [30] , [31] , [32] ]. The C─C bond of the ring was displayed at the wavelength 1446 cm −1 [ 12 ].…”