الفهرس 
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Abstract
A new synthesized polyaniline /starch/hematite biocomposite (PANI/S/Fe2O3 BC)
has been studied as an important material for on-site water remediation. PANI/S/Fe2O3
BC was successfully prepared by combining co-precipitation and interfacial polymerization techniques in presence of aqueous starch solution in an acidic medium under ultrasonic irradiation. The nano-morphologies, structures of the designed PANI/S/Fe2O3 BC, and structures of the engineered PANI/S/Fe2O3BC relative to PANI and Fe2O3 nanoparticles have been evaluated by XRD, SEM, TEM, and FTIR. A Ubbelohde viscometer was used to measure polyaniline´s intrinsic viscosity for molecular weight determination. In single and multiple systems, PANI/S/Fe2O3 BC was evaluated as a possible adsorbent for different heavy metals, including As3+, Zn2+, and Co2+, relative to PANI and Fe2O3 nanoparticles. In terms of pH value, operating temperature, initial heavy metal concentration, contact time, adsorbent dose, and competitive ions in the solutions, the adsorption process was optimized. The detection of heavy metals adsorption was quantified by ICP and confirmed by the potentiometric detection. The adsorption equilibrium was reached within 60 and 120 min, respectively, for 92% total adsorption of Co2+ and 100% total adsorption of both As3+/Zn2+. at optimum conditions of adsorbent dose 0.05 g in 25 ml, the initial metal concentration of
5 ppm, the temperature of 20 oC. In addition, the adsorption thermodynamic analysis shows that the adsorption of the As3+ ions was random and the experimental results were well fitted with the pseudo-second-order. On the other hand, PANI/S/Fe2O3 NC showed antibacterial activity against Gram-negative bacteria (Salmonella typhimurium) with an inhibition zone 18.02±0.08 and Gram-positive bacteria (S. aureus, Methicillin-Resistant Staphylococcus aureus Clinical isolate, and Bacillus subtilis) by inhibition zone about
13.98±0.13,10.10±0.11 and 14.12±0.14, respectively. These multifunctional proficiencies and low-cost fabrication of PANI/S/Fe2O3 BC suggest its promising applicability against a variety of water contaminants. So, the reported performances indicated that the PANI/S/Fe2O3 BC is a potent candidate for industrial water bioremediation.