Dual-functional fluorescent sensors based on CaMoO4:Eu3+ for detection of Iron(Ⅲ) and dichromate ions in aqueous

A novel inorganic dual-functional fluorescent chemosensors CaMoO 4 :Eu 3+ has been prepared via solid-state reaction by the assistance of gum arabic (GA). The fluorescence of as-prepared CMO:Eu 3+ was selectively quenched by Fe 3+ and Cr 2 O 7 2− ions in aqueous, resulting in the simultaneous detection of Fe 3+ and Cr 2 O 7 2− ions. The F − anions can recover the fluorescence when Fe 3+ quenching the fluorescence at 615 nm. Moreover, CMO:Eu 3+ displayed high sensitivity for Fe 3+ and Cr 2 O 7 2− assay and the detection limits were 8.26 and 4.78 μM, respectively. The fluorescence quenching mechanism was ascribed to the competitive adsorption between CMO:Eu 3+ and targets. Results indicated that CMO:Eu 3+ could be a promising candidate in Fe 3+ and Cr 2 O 7 2− ions assay in environmental systems.