Colorimetric and fluorescent Schiff base sensors for trace detection of pollutants and biologically significant cations: A review (2010–2021)

•An overview (2010–201) of Colorimetric and Fluorescent Schiff Base Sensors for Cations detection has been reviewed.•Summary includes the significant points, such as the structure, IUPAC name, detection limit (LOD), association constant, binding stoichiometry, the mechanism of binding, instrumental techniques used, and the practical applications.•The detection analysis has been classified on the basis of metal ions including the pollutant and biologically significant cations.•The performance evaluation, conclusion and future prospects of Schiff base sensors for Cations detection is discussed.