The development of
selective and fast optical sensitive chemosensors
for the detection and recognition of different cations and anions
in a domain is still a challenge in biological, industrial, and environmental
fields. Herein, we report a novel approach for the detection and determination
of fluoride ion (F
–
) sensing based on a salen-cobalt
metal-organic framework (Co(II)-MOF). By a simple method, the Co(II)-MOF
was synthesized and characterized using several tools to elucidate
the structure and morphology. The photoluminescence (PL) spectrum
of the Co(II)-MOF (100.0 nM/L) was examined versus different ionic
species like F
–
, Br
–
, Cl
–
, I
–
, SO
4
2–
, and NO
3
–
and some cationic species like Mg
2+
, Ca
2+
, Na
+
, and K
+
. In
the case of F
–
ions, the PL intensity of the Co(II)-MOF
was scientifically enhanced with a remarkable red shift. With the
increase of F
–
concentration, the Co(II)-MOF PL
emission spectrum was also professionally enhanced. The limit of detection
(LOD) for the Co(II)-MOF chemosensor was 0.24 μg/L, while the
limit of quantification (LOQ) was 0.72 μg/L. Moreover, a comparison
of the Co(II)-MOF optical approach with other published reports was
studied, and the mechanism of interaction was also investigated. Additionally,
the applicability of the current Co(II)-MOF approach in different
real water samples, such as tap water, drinking water, Nile River
water, and wastewater, was extended. This easy-to-use future sensor
provides reliable detection of F
–
in everyday applications
for nonexpert users, especially in remote rural areas.