چكيده به لاتين
Simultaneous analysis and removal of various heavy metal ions has received increasing concerns because they are usually co-existent with different toxicological effect. Multi-ion imprinting technology is able to treat the mixed pollutants in the same matrix simultaneously by retaining the recognition specificity for specific target ion. The resultant multi-ion imprinted polymers (MIIPs) as potential materials to treat mixed pollutions. In this research, An ion imprinted polymer based on magnetic-multiwalled carbon nanotube composite (IIP@MMWCNT) was synthesized and utilized as a novel sorbent for preconcentration and by sol-gel process used Cu2+, Ni2+, Pb2+, Co2+ and Cd2+ in real samples. Pre-concentration and determination of ion were performed by magnetic solid phase extraction and inductively coupled plasma spectroscopy (ICP-OES). The polymer was obtained by sol-gel process used Cu2+, Ni2+, Pb2+, Co2+ and Cd2+ as templates,1,5-diphenylcarbazone as a chelating agent, (3-Aminopropyl) triethoxysilane (APTES) as a functional monomer and tetreathoxysilane (TEOS) as a cross-linker and magnetic-multiwalled carbon nanotube as a substrate . The synthesized MIIP materials were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM) and adsorption and desorption analysis of Nitrogen gas(BET). Various analytical parameters such as extraction and desorption time, eluent type and concentration, the amount of adsorbent and pH were examined by central composite design. Optimum conditions: pH =5/83, absorption time: 15/88 min, the amount of adsorbent: 20/95 mg, time of desorption: 15/99 minutes, volume of solvent: 4 ml, dilute solvent concentration: 1.8 molar. The selectivity of MIIP sorbent for intended metal ions in the presence of some caions was also evaluated. The limit of detection (LOD) and linear range (LR) for Cu2+, Ni2+, Pb2+, Co2+ and Cd2+ were found to be 0/41, 0/18, 0/42, 0/31, 0/28 and 2-120, 2-120, 2-120, 2-120 and 2-90 µg L-1 and the relative standard deviation (RSD) for proposed ions were obtained 0/41, 1/38, 0/48, 1/99, 2/75 and the maximum sorption capacity of the IIP ,NIP 48/75,16/56 mg g-1 respectively. The accuracy of this method was confirmed using various standard reference materials. The ion imprinted polymeric nanoparticles are considered to be promising materials for magnetic solid-phase extraction and preconcentration of Cu2+, Ni2+, Pb2+, Co2+ and Cd2+ ions from different water samples including Caspian Sea water and tehtan tap water.
