Abstract
Water hyacinth (Eichhornia crassipies) has proved to be a menace in water bodies and studies are on, in the direction of solving this problem; one of which is to discover economic uses of water hyacinth. Adsorption of heavy metals and dyes from aqueous solutions by activated carbon derived from water hyacinth is one of such studies. In this study, dried and pulverized water hyacinth shoot was used for the sorption studies. This is in the bid of eliminating the rigours of producing activated carbon, thereby saving time and cost. The adsorption capacity of water hyacinth shoot for Methylene Blue dye was studied as a function of initial metal ion concentration in a batch system. Results showed that adsorption increased with methylene blue dye concentration. Seven adsorption isotherms, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Florry-Huggins, Harkins-Jura and Henry’s isotherms were applied to the adsorption data. Isotherm parameters showed that all the isotherms correlated well with the adsorption data. The maximum adsorption capacity of Methylene Blue dye to the dried water hyacinth shoot was found to be 58.14mg/g. The use of dried water hyacinth shoot would appreciably save the time and cost for producing activated carbon but not without some compromise of efficiency.
Highlights
Water hyacinth (Eichhornia crassipies) is a free floating aquatic plant with inflated petioles
The adsorption capacity of water hyacinth shoot for Methylene Blue dye was studied as a function of initial metal ion concentration in a batch system
The results reported show that water hyacinth is a useful material for the removal of dyes in solution
Summary
Water hyacinth (Eichhornia crassipies) is a free floating aquatic plant with inflated petioles. It has been reported to double its number every two weeks by means of off-shoots (Akinyemiju, 1987) It has posed itself as a menace in water bodies and water ways by degrading water quality, reducing light and oxygen diffusion, reduction in water movement/transportation and reduction of dissolved oxygen by its death and decomposition (Nyananyo et al, 2007). Dye effluents in aqueous streams represent another group of water pollutants that require great attention by virtue of the large amount of production and use of dyes globally (Imamura et al, 2002; Kanawade & Gaikwad, 2011). The use of water hyacinth for heavy metals and dye removal from aqueous solution by adsorption is well reported. The results reported show that water hyacinth is a useful material for the removal of dyes in solution
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