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Adsorption of methyl orange from aqueous solution using chitosan/diatomite composite
Peng Zhao1, Runhu Zhang2, Jianglin Wang1
1College of Chemical Engineering, Huaqiao University, XiaMen, China.
Summary
A novel chitosan/diatomite composite effectively removes methyl orange (MO) dye from water. This reusable adsorbent shows high capacity and efficiency, making it a promising solution for wastewater treatment.
Area of Science:
- Materials Science
- Environmental Chemistry
- Water Treatment
Background:
- Methyl orange (MO) is a common pollutant in industrial wastewater.
- Effective removal of dyes like MO is crucial for environmental protection.
- Developing efficient and reusable adsorbents is a key challenge in water purification.
Purpose of the Study:
- To synthesize and characterize a novel chitosan/diatomite composite.
- To investigate the adsorption performance of the composite for methyl orange removal.
- To evaluate the reusability and stability of the adsorbent material.
Main Methods:
- Preparation of chitosan/diatomite composite via simple mixture.
- Characterization using Fourier transform infrared spectroscopy and scanning electron microscopy.
- Adsorption studies including kinetics, isotherm, pH effect, and thermodynamics.
Main Results:
- The composite demonstrated rapid MO adsorption, reaching equilibrium in 40 minutes.
- Optimal adsorption occurred at pH 5.0, with a maximum removal rate of 88.37% at 50 mg/L MO.
- Adsorption data fitted well to the Langmuir isotherm and pseudo-second order kinetic model.
- The process was found to be spontaneous and exothermic, with good reusability over six cycles.
Conclusions:
- The chitosan/diatomite composite is a highly effective adsorbent for methyl orange removal.
- The adsorbent exhibits excellent adsorption capacity, reusability, and stability.
- This material shows significant potential for practical application in treating methyl orange-contaminated water.