A B S T R A C TThe present study reveals the adsorption of heavy metals, especially Pb 2+ from aqueous media by p-tetrathioureacalix[4]arene based Merrifield resin (1). The adsorption behavior of toxic Pb 2+ metal was evaluated through batch experiments and various parameters such as dosage, concentration and temperature were optimized. From the kinetic study, it has been noticed that adsorption mechanism follows pseudo-second order kinetic model. In addition, thermodynamic constants of adsorption phenomena for Pb 2+ was found to be DH = 0.098 kJ/ mol and DS = 0.339 kJ/mol, the positive value of DH suggest endothermic nature and spontaneity of process estimated by negative value of DG. The experimental data was carried out by applying different isotherm equations such as Freundlich, Langmuir, and Dubinin-Radushkevich, (D-R). From the analysis it could be clearly understood that Pb 2+ has been adsorbed chemically onto the surface of resin (1).In this view, calix[4]arene based resin (1) is very potential in minimize the risk of environmental water pollution by Pb 2+ .

Background: Calixarenes are widely used macromolecules in supramolecular chemistry synthesized by simple phenol formaldehyde condensation reaction in the presence of base. This article describes the synthesis, antibacterial, and antifungal properties of calix[4]arene appended with pyrrolidine at the upper rim (CAP3). Methods: Antimicrobial activity of CAP3 was determined by Kirby-Bauer well agar diffusion method in Mueller-Hinton agar (MHA) medium of growth against Escherichia coli (ATCC 8739), Staphylococcus aureus (ATCC 10231) and Streptococcus viridans (ATCC 12392), Candida albicans (ATCC 32333), Aspergillus niger (ATCC 16404), and Aspergillus flavus (ATCC 90906). Structure-activity relationship was also used to evaluate the active site of CAP3.

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