A manganese-based metal-organic framework electrochemical sensor for highly sensitive cadmium ions detection

A designed manganese-based metal-organic framework (ZJU-77, ZJU = Zhejiang University) has been sol-vothermally synthesized and structurally characterized. Due to the good water-stability and high affinity of nitrogen atoms on the frameworks to Cd2+, ZJU-77 and Nafion composites were dropped onto glassy carbon electrodes (GCE) to fabricate a modified ZJU-77/Nafion/GCE electrode, which could be employed for Cd2+ electrochemical detection with a detection limit calculated to be 0.12 ppb, lower than the upper concentration limit of Cd2+ permitted in drinking water. Excellent selectivity and anti-interference capacity in the presence of other competing species were exhibited. Furthermore, this proposed sensor was successfully applied to detect Cd2+ ions in various water samples obtained from the real environment.