a highly sensitive fluorescent bulk sensor based on isonicotinic acid hydrazide–immobilized nano-fumed silica (fumed-si–inah) for detection of hg2+ and cr3+ ions in aqueous media

Through functionalizing of isonicotinic acid hydrazide (inah) on to fumed silica nanoparticles, a novel fluorescent nanomaterial (fumed-si–inah) was synthesized and characterized using various techniques including ft-ir, sem, and tga. next, interaction of the new nanofluorophore material with metal cations was studied spectrofluorimetrically. the fluorescence evaluation of fumed-si–inah towards a wide range of cations including pb2+, cd2+, zn2+, cu2+, fe2+, ca2+, ni2+, mn2+, mg2+, co2+, na+, hg2+, cr3+, and k+ revealed that fumed-si–inah was a highly selective optical sensor for hg2+ and cr3+ ions in a wide range of ph in water. thus, it was applied as a fluorescent bulk sensor for hg2+ and cr3+ ions. the detection limits were obtained to be 3.5 × 10−5 and 4.2 × 10−5 m for hg2+ and cr3+, respectively.