期刊名称：International Journal of Environment and Bioenergy
电子版ISSN：2165-8951
出版年度：2013
卷号：5
期号：2
页码：62-79
语种：English
出版社：Modern Scientific Press
摘要：Coconut coir dust contains a large proportion of lignin and cellulosic groups which act as potential pollutants absorber in effluents. This study investigated the crosslinking of polyvinyl alcohol having one –OH group on its molecule with coconut coir dust in order to introduce functions to the polymer and increase its hydrophilicity by physical means. The application of the adsorbent to remove cationic dye malachite green from effluent was very feasibly. Adsorption was studied as a function of solution pH, contact time and initial dye concentration. Adsorption data were analysed using various isotherms models and was found to conform to the principle of Lagmuir, Freundlich and FloryHuggins models with good correlation coefficients (R~2 > 0.95). The kinetics was also studied to elucidate the mechanistic pathway of the process. Results revealed that pseudo second order kinetic model provided better fit than the pseudo-first order in terms of adsorption capacity of the sorbent. Changes in Gibb's free energy (ΔG) as calculated from Langmuir and Flory-Huggins isotherms are +3.033 and +14.634 respectively indicating a non-spontaneous process at the temperature of study. Based on this report, coconut coir dust could be used to functionalize low molecular weight polymers for its applications in wastewater treatment.
