A novel poly(acrylic acid-co-acrylamide)/ kaolinite composite was produced by copolymerization of partially neutralized acrylic acid and acrylamide with sawdust for crosslinking applying Bis-acrylamide having linear formulae (C₇H₁₀N₂O₂.), (H₂C=CHCONH) 2CH₂, potassium persulfate, K2S2O8 as initiator and sodium sulphite used as accelerator to reduce the polymerization time. Physiognomy of the composite was performed by techniques viz., Fourier Transform Infrared Spectroscopy, X-Radiation Diffractometry (Crystallography), Structural-Equation-Modeling, Energy-Dispersal X-Radiation-Analysis and Brunauer-Emmett-Teller methods. Divalent cadmium and lead electrolytes (adsorbate) adsorption on the adsorbent (composite) in aqueous solution was studied in batch experiments optimizing reaction parameters like “IA” of equilibrium amount, “CT” (wet time), neutrality (alkalinity and acidity) and calefaction (thermal reading). The quasi 2nd order kinetic archetypal ensued by AK. Adsorption isotherrms were applied to the empirical statistics which fitted well with a) Irving-Langmuir-isotherm and b) Freundlich adsorption isotherm. The supreme adsorption dimensions, qm (from Irving-Langmuir isotherm) at 25oC, were 28.57 mg g-1 and 32.25 mg g-1 for divalent cadmium and lead electrolytes, respectively. Data of activation energy (12.148 kJ mol-1 and 7.165 kJ mol-1 for divalent cadmium and lead electrolytes respectively) indicated physio-absorption. Results of thermodynamic parameters like ∆Go, ∆Ho and ∆So for both divalent cadmium and lead electrolytes suggested the phenomenon of the endothermic and spontaneity nature of the process. The newly synthesized composite attributed to its cost effective and environment friendly nature of the synthesis which will be deemed as a capable substance for the exclusion of adsorbent divalent cadmium and lead electrolytes from aqueous suspensions.
Munazzah Saeed, Manzoor Iqbal, Mahmood Iqbal, Sayed Muhammad Salman and Sadiq Afridi
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