Prussian Blue analogues as a platform for lead(II) and cadmium(II) removal from water by an electrochemical approach
摘要
Efficient water treatment is a global concern, particularly in regions like Mexico, which face contamination with heavy metal ions. This study focuses on the electrochemical separation of lead (Pb2+) and cadmium (Cd2+) ions using a set of Prussian Blue analogues (PBAs)—cobalt(II), nickel(II), and copper(II) hexacyanoferrates. Electrochemical methods offer promising alternatives, particularly when utilizing materials that achieve faradaic deionization properties. The PBAs were synthesized and characterized by structural and spectroscopic techniques. Electrodes were prepared by forming a conductive paste with the PBAs, and their electrochemical stability was assessed through cyclic voltammetry. The electrochemical assays revealed a superior electrochemical performance in cobalt(II) hexacyanoferrate (CoHCF) in removing Pb2+ (32.8 mg/g) and Cd2+ (54.2 mg/g) ions. The insertion mechanisms involving the reduction of FeIII were elucidated through spectroscopic measurements. The potential existence of CoIII was considered beneficial for ion removal processes. This study provides valuable insights into the practical applications of Prussian Blue analogues for water remediation.