Abstract
Dyes from several industry effluents are major concern of environmental pollution. In this study, the efficiency of a cost-effective natural adsorbent Strychnos potatorum Linn (Fam: Loganiaceae) seeds on removing reactive orange-M2R dye from aqueous solution was investigated using batch adsorption isotherms at 30 ± 1 °C and 120 rpm. The efficacy of the adsorbent system was also studied at various parameters viz. contact time, pH, adsorbent dosage and initial dye concentration. Maximum adsorption (q e = 9 mg/g) was observed at pH 2.0, equilibrium time 6 h, initial dye concentration of 100 mg/L and adsorbent dosage of 0.2 g/100 mL. The unit adsorption of dye, q e (mg/g) increased with increase in contact time and initial dye concentration, while it decreased with increase in adsorbent dosage. The adsorption kinetic studies revealed that it follows pseudo-second-order reaction model. Equilibrium adsorption data followed both Langmuir and Freundlich isotherms with good agreement. These investigations suggest that Strychnos potatorum Linn seeds (SPS) could be used as a low-cost adsorbent in treating textile effluents for dye removal applications. The adsorbent (SPS) was also characterized using Fourier transform infrared spectroscopy, powder X-ray diffraction, and scanning electron microscopic technique.
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Acknowledgments
The authors would like to express their gratitude to the Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, India for providing infrastructural support to carry out this research work and to Karunya University, Coimbatore, India for lending support in SEM and XRD analysis.
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Kirupa Sankar, M., Muthu Kumar, K. & Ranganathan, B.V. Adsorption of anionic azo dye from aqueous solution using Strychnos potatorum Linn seeds: isotherm and kinetic studies. Int. J. Environ. Sci. Technol. 12, 2957–2964 (2015). https://doi.org/10.1007/s13762-014-0668-y
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DOI: https://doi.org/10.1007/s13762-014-0668-y