Abstract
In this study, carbon nanotubes (CNTs) were synthesized from waste polyethylene bottles and their use as an adsorbent for the removal of diuron herbicide from aqueous solution was evaluated. Batch adsorption was performed by varying adsorbent dosage, initial concentration, contact time, and temperature. Kinetic models applied to experimental data indicated that the pseudo-second-order model had the best fit. The equilibrium data were analyzed using different isotherm models. The adsorption capacity of CNTs for diuron removal, determined using the Hill isotherm, was approximately 40.37 mg/g at 303 K. From thermodynamic studies, the values of ΔH° (kJ/mol) and ΔS° [kJ/(mol K)] were calculated as −17.307 and −0.0528, respectively, which suggested that the adsorption process was exothermic. The negative values of ΔG° at three different temperatures indicated that adsorption of diuron on CNTs was favorable.
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Acknowledgments
We thank the Science and Engineering Research Board (SERB), India, for providing us a research grant (Grant No. SB/S3/CE/077/2013) to undertake this work. Vijayakumar R.P. is thankful to the Science and Engineering Research Board, Government of India for providing SERB—Young Scientist Fellowship (Project No. SB/FTP/ETA-0235/2013).The authors would like to acknowledge Sophisticated Analytical Instruments Facility (SAIF), IIT Bombay, for allowing us to use the instrumentation facility. The authors thank Swetha, SWAN Editorial Services, for improving the language of this paper.
Funding
This work was supported by the ‘Science and Engineering Research Board (SERB) India’ under a grant no. SB/S3/CE/077/2013. Author Vijayakumar R.P. is thankful to Science and Engineering Research Board, Government of India for providing SERB—Young Scientist Fellowship (Project no. SB/FTP/ETA-0235/2013).
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Deokar, S.K., Bajad, G.S., Bhonde, P. et al. Adsorptive Removal of Diuron Herbicide on Carbon Nanotubes Synthesized from Plastic Waste. J Polym Environ 25, 165–175 (2017). https://doi.org/10.1007/s10924-016-0794-3
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DOI: https://doi.org/10.1007/s10924-016-0794-3