Abstract
AbstractVarious agricultural wastes such as peels of pea (Pisum sativum) pod, tea (Camellia sinensis), and ginger (Zingiber officinale) and banana (Musa lacatan) waste were used to adsorb Cr(VI) from the aqueous solutions. A comparative adsorption efficiency study for all these adsorbents was done in laboratory for various pH, adsorbent doses, initial chromium concentrations, contact time, adsorbent sizes, temperature, and mixing speeds up to the optimization. The equilibrium sorption data were fitted into Langmuir, Freundlich, and Temkin isotherms and also the various thermodynamic parameters were determined. The value of R2 was determined for Freundlich, Langmuir, and Temkin as 0.964, 0.963, and 0.858 (pea pod peels waste (PPP)), 0.969, 0.986, and 0.841(tea & ginger waste (T&G)), 0.985, 0.982, and 0.886 (banana peel waste (BW)). The maximum monolayer coverage (Q0) from Langmuir isotherm model for pea pod, tea & ginger and banana peels waste were found to be 4.33 mg/g, 7.29 mg/g, and 10 mg/g, respectivel...
Highlights
There has been a worldwide public awareness for the heavy metal contamination and toxicity in aquatic environment
The study reveals that agricultural wastes such as pea pod peels, used tea and ginger, and banana peels can be reused as potential adsorbents for the removal of hexavalent chromium from tannery and metal finishing wastewaters
Adsorbents One week sun-dried banana waste (BW) from fruit seller and Pea pod peels from a farmhouse were first dried in oven for three days at a temperature of 90°C for 5 h daily and the tea & ginger waste (T&G) from a tea stall was well washed many times with water and with distilled water spread for sun drying for a week, and oven dried for three days at a temperature of 90°C for 5 h daily
Summary
There has been a worldwide public awareness for the heavy metal contamination and toxicity in aquatic environment. The study reveals that agricultural wastes such as pea pod peels, used tea and ginger, and banana peels can be reused as potential adsorbents for the removal of hexavalent chromium from tannery and metal finishing wastewaters. It is beneficial for protection water quality in rivers and ground water. Have widespread usage in industries and enter the environment wherever they are produced, used, or discarded All these metals become seriously toxic as ions or compound being soluble in water and readily absorbable by living organisms.
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