In the present study, CuO, polypyrrole (PPy), and CuO/PPy nanocomposites were synthesized to compare the selective adsorption behavior of hazardous metal ions such as Pb(II) ions. The synthesized nanomaterials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, BrunauerEmmett-Teller surface area analysis, and energy dispersive X-ray spectroscopy. The adsorption studies clearly showed that CuO/PPy nanocomposites exhibited much higher adsorption performance than individual CuO and PPy. Kinetic data followed the pseudo-second-order model. The equilibrium attained at 120 min and isotherm follows the order Sips > Langmuir > Freundlich. The adsorbed Pb(II) is desorbed using 0.1 m HCl. The adsorption-desorption studies conducted over six cycles illustrate the viability and repeated use of the adsorbent for the removal of Pb(II) from aqueous solutions. The adsorbent's practical efficiency and usefulness were tested using real industrial wastewater, and 0.55 g/L of adsorbent is adequate for the complete removal of Pb(II). Cytotoxicity results show that CuO/PPy nanocomposites were biocompatible at lower concentrations, and they were used as an ecofriendly nanoadsorbent for industrial and environmental applications.

Abstract-This study investigates the applicability of SnO 2 nanoparticles for the removal of Pb(II) from waste water . SnO 2 nano particles of 15 nm size were synthesized using a solgel method and characterized by X-ray diffraction (XRD), FTIR, SEM and transmission electron microscope (TEM). Batch experiments were carried out to study the adsorption kinetics of Pb(II) on SnO 2 . The effect of varying parameters such as contact time and P H on the adsorption process were examined. The adsorption process was found to be highly P H dependent. Experimental kinetic data were tested with pseudofirst -order and pseudo-second-order kinetic equations. The equilibrium data were modeled using general isotherm models. The experimental data agreed well with Langmuir isotherm model.Index Terms-Sol-gel method, adsorption, removal of lead.

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The present study is focused on the comparison of structural and photocatalytic degradation activities of nanocomposite of MgO formed with rice straw, a biopolymer. For comparison, counter parts were also synthesized. Nanoparticles of magnesium oxide were synthesized through controlled co-precipitation method in presence of citric acid. Structural characterizations of all the synthesized samples were carried out using XRD. Comparison of XRD of metal oxide with JCPDS confirmed that the formed metal oxide was MgO. Photocatalytic degradation of organic dyes Congo Red, an acidic dye and Methylene Blue, a basic dye was done.