Preparation Of Electroactive Polymer/α-SnP Hybrid Film And Its ESIX Performance For Heavy Metal Ions

The developing of conductive functional materials is considered the main topic of electrochemical research. Integration of organic and inorganic materials at nanoscale by regulating macroscopic synthesis parameters is a promising method to obtain unusual functional materials. Electrochemically switched ion exchange (ESIX) has captured the attentions of scientific community due to its environmentally benign way to separate toxic ions. Thus we develop polyaniline/tin phosphate (PANI/SnP) and poly-acid yellow9/tin phosphate (PAY/SnP) hybrid films which are good at separating toxic heavy metal ions. In addition the mechanisms of preparation and separation were discussed.Layered inorganic compounds a-SnP were prepared by hydrothermal process, then a-SnP was exfoliated by tetrabutylammonium hydroxide in aqueous solution. Electroactive PANI/a-SnP hybrid films were deposited on the carbon paper electrode via cyclic voltammetry(CV)method. Morphologies and structure of the as-prepared hybrid films were characterized by scanning electron microscopy(SEM), fourier transform infrared spectroscopy(FT-IR), and the crystal structure of single a-SnP and hybrid films were analyzed via X-ray diffraction(XRD). The results showed that positively charged PANI and negative charged a-SnP could be composited by electrostatic attraction at the applied high potential of CV electro-deposition. Electroactivity of hybrid films were affected observably by the scan rate of CV and anline concentration. Due to the synergistic effect of PANI and a-SnP, hybrid films have higher electroactivity than single PANI or a-SnP film in aqueous solution containing Ni2+ions. The ESIX property of hybrid film for recovering Ni2+ions was tested by electrochemical quartz crystal microbalance(EQCM), Ni2+ions loading and unloading can be easily controlled by modulating the redox states of hybrid film, in addition the rate and quantity of adsorption and desorption can be adjusted by modulating the value of applied potential. Thus separation of Ni2+ions from mixed solution and regeneration of the film material could be achieved.Electroactive PAY/a-SnP hybrid film was deposited on the carbon felt electrodes by CV electro-deposition method. The electroactivity and electrochemical stability was tested by CV. The change of morphologies and structure of the as-prepared hybrid films which adsorbed Pb2+ions were characterized using SEM, FT-IR and XRD. In addition, ESIX property of hybrid film for recovering Pb2+ions were tested by Atomic Absorption Spectrometry(AAS). And the distribution studies (Kd) of seven different metal ions such as Hg2+, Cd2+, Ni2+, Pb2+, etc were explored on the PAY/a-SnP hybrid film electrode. The results showed that positively charged PAY and negative charged a-SnP could be composited by electrostatic attraction at the applied high potential of CV electro-deposition. Due to the synergistic effect of PAY and a-SnP, hybrid films have higher electroactivity than single PANI or a-SnP film in aqueous solution containing Pb2+ions. Pb2+ions loading can be easily controlled by modulating the redox states of hybrid film. In addition the rate and quantity of adsorption process can be adjusted by modulating the value of applied potential. The distribution studies exhibited the highly selective nature of PAY/a-SnP hybrid films for Pd2+as compared to other metal ions. Thus the separation of Pb2+ions from mixed solution and regeneration of the hybrid material could be achieved.