Chitin-Based Magnesium Oxide Biocomposite for the Removal of Methyl Orange from Water

• Published in: International journal of environmental research and public health Vol. 20; no. 1; p. 831
• Main Authors: Majdoubi, Hicham, Alqadami, Ayoub Abdullah, Billah, Rachid El Kaim, Otero, Marta, Jeon, Byong-Hun, Hannache, Hassan, Tamraoui, Youssef, Khan, Moonis Ali
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.01.2023; MDPI
• Subjects: Adsorbents; Adsorption; Aqueous solutions; Biomedical materials; Carbon; Chitin; Color removal; Composite materials; Dyes; Hydrogen-Ion Concentration; Kinetics; Magnesium; Magnesium Oxide; Membrane separation; Monomolecular films; Spectroscopy, Fourier Transform Infrared; Superconductors (materials); Water; Water Pollutants, Chemical - analysis; United States > US; adsorption; anionic dye; regeneration; waste management; sea food waste
• ISSN: 1660-4601; 1661-7827; 1660-4601
• DOI: 10.3390/ijerph20010831

In this work, a cost-effective chitin-based magnesium oxide (CHt@MgO) biocomposite with excellent anionic methyl orange (MO) dye removal efficiency from water was developed. The CHt@MgO biocomposite was characterized by FT-IR, XRD, SEM-EDX, and TGA/DTG. Results proved the successful synthesis of CHt@MgO biocomposite. Adsorption of MO on the CHt@MgO biocomposite was optimized by varying experimental conditions such as pH, amount of adsorbent (m), contact time (t), temperature (T), and initial MO concentration ( ). The optimized parameters for MO removal by CHt@MgO biocomposite were as follows: pH, 6; m, 2 g/L; t, 120 min. Two common isotherm models (Langmuir and Freundlich) and three kinetic models (pseudo-first-order (PFO), pseudo-second-order (PSO), and intraparticle diffusion (IPD)) were tested for experimental data fitting. Results showed that Langmuir and PFO were the most suitable to respectively describe equilibrium and kinetic results on the adsorption of MO adsorption on CHt@MgO biocomposite. The maximum Langmuir monolayer adsorption capacity ( ) on CHt@MgO biocomposite toward MO dye was 252 mg/g at 60 °C. The reusability tests revealed that CHt@MgO biocomposite possessed high (90.7%) removal efficiency after the fifth regeneration cycle.