Abstract

Mohammad Nurnabi^1*, Snahasish Bhowmik², Md. Sirajur Rahman¹, Tasrina Rabia Choudhury³, Andrew J. Parsons⁴ and Scott D. Young⁵

DOI : http://dx.doi.org/10.13005/ojc/360401

Sawdust of Albizia lebbeck (locally known as koroi) was modified by treatment with sodium methylate followed by reactions with epichlorohydrin and n-dodecylamine to afford the sorbent which was termed as DDA-SD. The sorbent was characterized with the help of FTIR (ATR), SEM and chemical test. It was then used for the sorption of Pb²⁺ and Cu²⁺ from aqueous solutions and the effects of solution pH, dosage of sorbent, initial metal ions concentration and contact time were enumerated. The sorption data were tested for Langmuir and Freundlich isotherm models and found that the process followed Langmuir model and the maximum sorption capacities were calculated as 17.37 mg/g and 9.4 mg/g for Pb²⁺ and Cu²⁺ ions respectively. The sorption data were also tested for pseudo-first order and pseudo-second order kinetic models and the data fitted well with pseudo second order kinetics. Exhausted DDA-SD adsorbent can be regenerated using 0.1M HCl or 0.1M HNO₃ followed by wash with deionized water and reused for further adsorption purpose.

Etherification; Epichlorohydrin; Epoxy Moiety; Morphology; Non-Biodegradable

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