article · International Journal of Environmental Research and Public Health
A chitin-based magnesium oxide biocomposite has been developed as an effective adsorbent for removing methyl orange dye from water. Structural and thermal analysis confirmed the synthesis of the material. Performance testing identified optimal conditions for dye removal at a pH of 6, an adsorbent dosage of 2 grams per litre, and a contact duration of 120 minutes. Evaluation across common equilibrium and kinetic models revealed that the dye uptake corresponds most closely to Langmuir isotherm and pseudo-first-order kinetic models. Under these conditions, the biocomposite achieved a maximum monolayer adsorption capacity of 252 milligrams per gram at 60 degrees Celsius. In addition, the material demonstrated robust operational durability, retaining a 90.7 percent removal efficiency after five regeneration cycles.
Synthetic dyes released into wastewater present persistent ecological hazards and complicate water treatment. Demonstrating that a chitin and magnesium oxide biocomposite achieves high dye adsorption and maintains over 90 percent efficiency across multiple reuse cycles offers an effective, reusable alternative for cleaning industrial water streams.
This work could enable wastewater treatment applications, particularly for industrial operations that need to eliminate anionic synthetic dyes from process effluent. Prospective users include industrial effluent treatment facilities and water management operators. Because the findings are based entirely on laboratory-scale batch experiments and adsorption modelling, the technology is at an early research stage, requiring pilot testing under real-world wastewater conditions before commercial deployment.
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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 (Co). 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 (qm) 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.
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DOI: 10.3390/ijerph20010831
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