Equilibrium Studies for the Removal of Fe2+, Ni2+, Pb2+, Cu2+and Zn2+ in Wastewater on Formaldehyde Polymerized Peanut Test (ArachishypogaeaL.) Extract
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 3
Abstract
Formaldehyde polymerized peanut testa extract (F-PTE) was used as an adsorbent to remove Fe2+ , Ni2+, Pb2+, Cu2+ and Zn2+ in laboratory simulated wastewater (LSW) under various conditions. The results showed that the efficiency of the process depended significantly on the pH and temperature of the wastewater, initial adsorbate concentration as well as contact time,andpartially on the amount of adsorbent used.The amount of Zn2+ removed by Formaldehyde polymerized and sulphonated peanut testa extract (FS-PTE) resinincreased from 61.2%at room temperature (RT)to 72.1%at 50oC and 80.3% at60oC.Amounts of the metal ions removed from the LSW equally increased from pH 2.0to pH 8.0. The percentage of Fe2+ removedby F-PTE increased from 20.7%at 30mins to 71.6%at 120mins and thereafter, reduced to 68.4% at 150minutes. Increase in initial concentration of the metal ions from 5.0 to 25.0 mg/L led to a corresponding decrease in the amount of metal ions removed. Metal ions recovered by both resins (F-PTE &FS-PTE) wereunaffected when the agitation rateof LSW was altered.FS-PTE removed 72.1% Pb2+in LSW when the water was stirred at 90rpm, 180rpm and 210rpm. Further results showed that equilibrium removal of the metal ions occurred at 120minutes using 4.0g of adsorbent in a LSW containing 10ppm of individual metal ions at 60oC and pH 8.0. The adsorption mechanisms fitted well to Langmuir isotherm models with large R2 valuesindicating that adsorption of Fe2+ , Ni2+, Pb2+, Cu2+ and Zn2+ on F-PTE is favourable while pseudo-first-order model explained the kinetic data. Thus,it supports the potential application of this technique in rehabilitating wastewater and mitigating the challenges of wastes disposal.
Authors and Affiliations
Uchechukwu T. O. , Chukwu U. J. , Akaranta O.
Keywords
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- EP ID EP414024
- DOI 10.9790/5736-1103016374.
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