Removal of Hexavalent Chromium by Adsorption Using Stem Extract Material from Water Hyacinth
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Date
2021-07-27
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Addis Ababa University
Abstract
Environmental pollution is one of the public issues for both developed and developing countries due to population growth, industrialization, urbanization and economic development. Toxic heavy metals are the most common inorganic pollutants to the environment. Chromium is one of the toxic heavy metal identified by world health organization (WHO) as major public health concern. This study focus on the removal of hexavalent chromium (Cr(VI)) on a stem extract material from water hyacinth. The physicochemical properties like crude fat, crude protein, crude fiber, moisture and ash contents of the adsorbent material were investigated. The effects of various variables such as initial concentration of Cr(VI), contact time, adsorbent dosage and pH, which influence the adsorption process were studied using UV-visible spectrophotometer. The optimum conditions were found to be 5.0 mg for adsorbent dose, and 240 and 210 min for contact times in the unmodified (SEMWH) and modified (SEMWH-AN) adsorbent materials, respectively. The adsorption capacities were found to be of 31.82 for SEMWH and 35.64 mg/g for SEMWH-AN adsorbents. In addition, maximum removal percentages of Cr(VI) were 96.0% and 99.9% for the aforementioned adsorbents, respectively. The experimental results show that the adsorption of Cr(VI) on adsorbents follow Langmuir isotherm model and obey pseudo-second-order kinetics
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Stem Extract Material from Water Hyacinth, Adsorbent, Polyaniline, Hexavalent Chromium and Uv-Visible Spectroscopy