首页|An ionic covalent organic framework loaded with terbium-based probe for the sensing and removal of chrysolepic acid: Characterization and ratiometric behavior
An ionic covalent organic framework loaded with terbium-based probe for the sensing and removal of chrysolepic acid: Characterization and ratiometric behavior
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Chrysolepic acid(CA)is a widely-used chemical product and considered hazardous for ecosystem and human health,which makes its removal as important as its sensing.In this work,a composite structure(denoted as Tb-COF,with a structural composition of C_(162)H_(120)N_(18)O_(12)Br3·C_(21)HgNsO_(12)Tb1)was synthesized,consisting of an ionic covalent organic framework(denoted as I-COF,with a structural composition of C_(162)H_(120)N_(18)O_(12)Br6)and a terbium-based dopant/emitter(denoted as Tb(DPA)_3~(3-),DPA = pyridine-2,6-dicarboxylic acid).Tb-COF was identified by means of single crystal analysis,infrared(IR)spectra,X-ray diffraction(XRD),porosity analysis,SEM(scanning electron microscope)/TEM(transmission electron microscope)and elemental composition analysis.The dopant loading level in Tb-COF was determined as 41%.Both green emission from Tb-based dopant and red emission from I-COF host were observed.The presence of CA quenched I-COF emission but enhanced dopant emission,resulting in ratiometric sensing signal.A linear calibration curve was demonstrated,with fitting equation of I/I0 = 1.223 + 6.709 × 10~5 M~(-1)[CA],R~2 = 0.996,within [CA] region of 0-9 μM.The key sensing/adsorption process was revealed as the adsorption of I-COF micropores for CA molecules,which endowed Tb-COF with a good selectivity over competing species.I-COF adsorption/removal feature for CA was tentatively evaluated.
NSTL
