Cr (III) Removal Capacity in Aqueous Solution in Relation to the Functional Groups Present in the Orange Peel (Citrus sinensis)

Applied Sciences

Rosa Hernández-Soto¹  José A. Hernández¹  Laura Patiño-Saldivar¹  Mercedes Salazar-Hernández²  Alba Ardila³  Alfonso Talavera⁴ 

[1] Department of Comprehensive and Institutional Training, Academy of Biotechnology and Pharmacy, UPIIG—Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato, Instituto Politécnico Nacional, Guanajuato 36275, Mexico;Department of Mining Engineering, Metallurgy and Geology, Engineering Division, University of Guanajuato, Guanajuato 36025, Mexico;Jaime Isaza Cadavid Colombian Polytechnic, Medellín 4932, Colombia;Unit of Chemical Sciences, Campus UAZ XXI Century, University of Zacatecas, Zacatecas 98160, Mexico;

关键词: bioadsorption;    orange peel;    removal;    functional groups;    mass transfer;   

DOI  :  10.3390/app11146346

来源: DOAJ

【 摘 要 】

Bioremediation is a pollutant removal method that has had a great boom due to the diversity of agroindustrial waste that can be used for this purpose, and that has shown having great efficiency and profitability in the adsorption of heavy metals, such as Pb, Cu, and Co. Based on the above, the present work carried out kinetic and equilibrium studies of bioadsorption of Cr (III) using orange peel (OP) as adsorbent, previously treated with methanol, water, and a water–methanol mixture at different pH (0.91, 1.78 and 2.72), and at 30 °C, finding that the adsorption capacity at equilibrium increases with increasing pH, having a maximum of 55 mg g⁻¹ at pH 2.72—under these conditions, lower adsorption energy was used to remove Cr (III). In addition, it was determined that there are no external mass transfer limitations. An isoelectric point analysis indicated that the adsorption is not carried out by electrostatic forces and a FTIR study of the functional groups of OP showed a decrease in the main functional groups (pectin, cellulose, and lignin, among others), which is directly related to the adsorption capacity of the bioadsorbent.

【 授权许可】

Unknown