Lignocellulosic fraction of the pericarps of the acorns of Quercus suber and Quercus ilex: isolation, characterization, and biosorption studies in the removal of copper from aqueous solutions

Abstract

Pericarps of Algerian Quercus ilex (Q. ilex) and Quercus suber (Q. suber) were used as copper adsorbents in artificially contaminated solutions. Exposing accessible lignocellulosic binding sites enhanced adsorption. The lignocellulosic fractions of Q. suber and Q. ilex (36.47±9.1 and 47.66±9.3, respectively) were characterized by FTIR before and after adsorption. The aim was to identify the functional groups adsorbing Cu(II). SEM/EDX determined lignocellulose surface morphology and composition. The amount of adsorbent-bound Cu(II) increased with initial [Cu(II)]. Cu(II) adsorption range was 23.59–48.06 mg.g−1 for Q. Suber and 22.56–38.19 mg.g−1 for Q. ilex when [Cu(II)] was 100–500 mg.L−1. Adsorption isotherms and Langmuir and Freundlich models of the Q. suber and Q. ilex lignocellulosic fractions indicated natural Cu(II)adsorption capacities (Qmax) of 53.76 mg.g−1 and 36.06 mg.g−1 and KF of 5.9 mg.g−1 and 7.43 mg.g−1, respectively.

Food By-Product Valorization by Using Plant-Based Coagulants Combined with AOPs for Agro-Industrial Wastewater Treatment

“…As expected, lignin presence is confirmed through the band range of 1530–1508 cm −1 , characteristic of lignin aromatic skeletal vibrations [ 27 , 28 ]. In addition, the band around 1050 cm −1 is assigned to the C–O bond from the lignin structure [ 28 , 29 ]. The band within the range between 1100 and 950 cm −1 indicates the presence of polysaccharides [ 27 , 28 ].…”

“…The first bands were within the range from 3400 to 3250 cm −1 , representing the stretching vibration of the O-H bond of the hydroxyl functional group (OH) that is present in proteins, fatty acids, carbohydrates, cellulose, and lignin [ 26 , 27 , 28 , 29 , 30 ]. Furthermore, the band at 2900 cm −1 identified the C–H stretching vibrations of CH 3 and CH 2 from aliphatic structures attributed to fatty acids, lipids, protein, and polyphenols [ 26 , 27 , 28 , 29 , 31 ]. The band range between 1800 and 1700 cm −1 is ascribed to the C=O stretching vibrations in the carbonyl groups.…”

“…The band range between 1800 and 1700 cm −1 is ascribed to the C=O stretching vibrations in the carbonyl groups. The vibration bands between 1650–1540 cm −1 were assigned to the N-H bond from the amines group and the 1250 cm −1 vibration band indicates the C-O stretching vibration of the phenols [ 26 , 27 , 28 , 29 , 30 , 31 ]. As expected, lignin presence is confirmed through the band range of 1530–1508 cm −1 , characteristic of lignin aromatic skeletal vibrations [ 27 , 28 ].…”

“…The vibration bands between 1650–1540 cm −1 were assigned to the N-H bond from the amines group and the 1250 cm −1 vibration band indicates the C-O stretching vibration of the phenols [ 26 , 27 , 28 , 29 , 30 , 31 ]. As expected, lignin presence is confirmed through the band range of 1530–1508 cm −1 , characteristic of lignin aromatic skeletal vibrations [ 27 , 28 ]. In addition, the band around 1050 cm −1 is assigned to the C–O bond from the lignin structure [ 28 , 29 ].…”

“…In addition, the band around 1050 cm −1 is assigned to the C–O bond from the lignin structure [ 28 , 29 ]. The band within the range between 1100 and 950 cm −1 indicates the presence of polysaccharides [ 27 , 28 ]. Finally, the band at 800 cm −1 (approximately) could be assign to the presence of the C–H bond belonging to the structure of cellulose [ 28 ].…”