SnO2/SnSbP nanocomposite–based ion-selective electrode for the trace level sensing of Pb2+ ions in waste water samples
摘要
In the present investigation, tin oxide-tin (IV) antimonophosphate (SnO2/Sn(IV)SbP) nanocomposite has been synthesized and employed for the sensing of Pb2+ ions. The morphology and crystallinity of the as-prepared nanocomposite were investigated employing various sophisticated techniques. The SnO2/SnSbP nanocomposite displayed enhanced ion exchange capacity (1.59 meq g−1) compared to pristine tin (IV) antimonophosphate (1.35 meq g−1). The distribution coefficient investigations revealed a higher response of the nanocomposite for Pb2+ ions in comparison to other metal ions. Consequently, the SnO2-SnSbP nanocomposite was employed to construct a lead selective electrode. The fabricated Pb2+ selective sensor showed a linear response over a concentration range of 1.0 × 10−7 M to 1.0 × 10−1 M, a workable pH range of 3.0–8.5, quick response time of 12 s, and a life-span of 120 days without any deviation in potential. The fixed interference approach revealed that the fabricated electrode showed exceptional selectivity for Pb2+ ions over other metal ions. Furthermore, the as-prepared Pb2+ ions selective sensor was also utilized successfully as an indicator electrode in potentiometric titrations, as well as quantitative estimation of Pb2+ ions in different water samples.