Biosorption of Ni2+ and Cr3+ in synthetic sewage: Adsorption capacities of water hyacinth (Eichhornia crassipes)

Authors : Francis James OGBOZİGE, Helen NWOBU

Pages : 342-351

Doi:10.35208/ert.980490

View : 13 | Download : 11

Publication Date : 2021-12-31

Article Type : Research Paper

Abstract :Water hyacinth insert ignore into journalissuearticles values(Eichhornia crassipes); is an aquatic weed that is causing numerous adverse effects on freshwater bodies. Developing countries are still battling on how to control the growth of this weed without damaging other aquatic lives important to man. Literatures have revealed that most developing countries are still discharging untreated sewage containing heavy metals into waterbodies due to economic and technical constraints in handling conventional methods of treating heavy metals. Hence, the research investigated the possibility of using water hyacinth to adsorb heavy metals insert ignore into journalissuearticles values(Ni 2+ and Cr 3+ ); from sewage before discharging into waterbodies in order to solve two major problems faced in the aquatic environment, at minimal cost. This was achieved by using the said weed insert ignore into journalissuearticles values(water hyacinth); to treat Ni 2+ and Cr 3+ solutions prepared in the lab. Results showed that the adsorption process for both ions occurred on heterogeneous surfaces while the mechanism of adsorption followed Pseudo 2nd–order kinetics. The Freundlich, Langmuir and Temkin adsorption capacities for Ni 2+ are 19.6925 L/g, 0.7470 L/mg and 1.1093 L/mg respectively while for Cr 3+ are 16.814 L/g, 0.7011 L/mg and 0.9623 L/mg respectively. However, the heat of sorption for Ni 2+ is 96.906 KJ/mol while that of Cr 3+ is 98.749 KJ/mol. Furthermore, FT-IR analysis identified seven functional groups involved in the binding sites with more of hydroxyl group insert ignore into journalissuearticles values(O–H); from alcohol and carboxylic acid. It was concluded that water hyacinth could be used as a potential bio-adsorbent of metal ions.
Keywords : Freundlich, Halsey, Harkin Jura, Langmuir, Temkin