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Preparation and characterization of p-sulfonated calix[4]arene functionalized chitosan hydrogel beads and their preliminary adsorption study towards removal of lead(II) and zinc(II) ions. Mal. J. Fund. Appl. Sci. [Internet]. 2020 Aug. 17 [cited 2026 Sep. 16];16(4):429-32. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/1765