Browsing by Author "Shyamaladevi N"

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    SORPTION CHARACTERISTICS OF AGRO WASTE PRODUCT IN THE REMOVAL OF LEAD (II)
    (Elsevier, 2008-03) Muthulakshmi Andal N; Shyamaladevi N
    A study was conducted to investigate the sorption capacity of saw, an agro waste product for the removal of lead(II)(Pb)(II) from aqueous systems. Commercially available saw dust were purchased from small-scale domestic units, such as furniture mart and varying concentrations of Pb(II) were used for Pb(II)-SD system. The study involved adding 75 mg of particles size of saw dust into iodine flasks, which contained 50 ml of the 10 mg/liter adsorbate. Pb solutions were filtered and analyzed for the residual concentration, using Atomic Absorption Spectrophotometer. The absorption investigations were carried out, by varying the particle size, contact time, initial concentration, dosage, pH of the medium, influence of cations, anions, co-ions, and the effect of temperature. It was observed that the sorption rate for the Pb(II) saw dust system were dependent on the availability of active surface sites on the adsorbent
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    VIRTUAL SCREENING OF TREATED PISTACHIO VERA SHELL POWDER AS A POTENTIAL SORBENT IN SEQUESTERING UBIQUITOUS DIVALENT METAL IONS FROM AQUEOUS MATRICES
    (Oriental Journal of Chemistry, 2018) Shyamaladevi N; Muthulakshmi Andal N; Vivithabharathi K
    Water pollution due to noxious heavy metals such as Hg(II), Cr(VI), Cd(II) and Pb(II) ions etc., has been tremendously focused gaining attention towards social benefit. Increasing concentrations of these metals into the ecosystem constitute a severe health hazard due to their toxicity, accumulation and bio-magnification throughout the food chain. Lead contamination of drinking water is a great threat through varied sources viz., lead pipes, plating units etc. Pistachio vera shell (PVS) is a hard layer that surrounds the delicious kernel of the nut. The current work evaluates the feasibility of powdered Pistachio vera shell (PVSP) - a biowaste for sequestering Pb (II) ions is treated with 0.1N HCl and 0.1N NaOH to enhance its sorption efficacy (TPVSP). SEM, FTIR and microscopic analyses are recorded for characterizing the chosen sorbent. Batch experimental studies are performed to assess the equilibration between the sorbate and the sorbent. The competence of the sorbent material is experimentally verified through various operating factors viz., particle size and dosage of TPVSP, agitation time interval between TPVSP and Pb(II) ions, initial concentrations of Pb(II) ions, pH of the adsorption medium, effects of cations, anions, co-ions and influence of temperatures on Pb(II) – TPVSP system. The residual concentrations of Pb (II) ions from aqueous solutions are analyzed using Atomic Absorption Spectrophotometer (Shimadzu-AA-6200). Langmuir and Freundlich models are applied to describe the adsorption capacity. Column studies are conducted to ensure the quantitative estimation of TPVSP in trapping 99% of sorbate species at a dose of 40 mg the flow rate being, 100 ml/10 min. assuring the bulkiness of the material.