四硫代钼酸根/1-辛烷磺酸根/LEuH复合体发光性能及对Hg^(2+)的识别

Luminescence Property and Detection Capability Towards Hg^(2+) of LEuH Composites with MoS_4^(2-) and OS^- Anions

采用改进的均匀沉淀法合成了硝酸根插层的稀土铕层状氢氧化物(NO_3-LEuH),通过离子交换法将阴离子型表面活性剂1-辛烷磺酸根(OS-)及无机阴离子MoS2-4共插层于LEu H的层间,通过改变MoS_4^(2-)和OS^-的投料比得到一系列发光强度不同的复合体(MoS_4)_xOS_(1-x)-LEuH(x=0.02,0. 10,0. 20).采用X射线粉末衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和荧光分光光度计(PL)等研究了其结构及性质.结果表明,MoS_4^(2-)会明显削弱层板Eu^(3+)的红光发射,且在一定MoS_4^(2-)/OS^-摩尔比范围内发光强度随MoS_4^(2-)含量增加而降低.选择MoS_4^(2-):OS^-摩尔比为0.02∶0. 98的复合体(MoS4)0.02OS0.98-LEu H用于水体系重金属离子Hg^(2+),Cu^(2+),Ag+,Pb^(2+)的荧光识别,发现剥离态复合体对Hg^(2+)具有选择性识别能力,加入含Hg^(2+)水溶液后发光有一定程度增强,可用作off-on型荧光传感器件识别毒性Hg^(2+).

NO 3-LEuH(LEuH=layered europium hydroxide)precursor was synthesized via a developed hydrothermal method,and co-intercalation of MoS 2-4 and OS-into LEuH layers was achieved by an ion-exchange with NO-3,thus a series of composites of(MoS 4)x OS 1-x-LEuH(x=0.02,0.10,and 0.20)with different molar ratios of MoS 2-4 to OS-was obtained.The structure and property of(MoS 4)x OS 1-x-LEuH composites were investigated via powder X-ray diffraction(XRD)patterns,Fourier transformed infrared spectra(FTIR)and photoluminescence(PL)spectra.The delaminated(MoS 4)x OS 1-x-LEuH in formamide presented markedly quenched luminescence of layer Eu 3+ions at 614 nm,and higher MoS 2-4∶OS-molar ratios(from 0.02∶0.98 to 0.20∶0.80)resulted in weakened luminescence intensity.The fluorescence recognization ability towards heavy metal ions of Hg 2+,Cu 2+,Ag+and Pb 2+of the delaminated(MoS 4)0.02 OS 0.98-LEuH composite was investigated.After addition of aqueous solutions of Hg 2+(0.01-10μmol/L),the(MoS 4)0.02 OS 0.98-LEuH exhibited enhanced luminescence of layer Eu 3+.Supported by the Natural Science Foundation of Shandong Province,China(Nos.ZR2013BL017,ZR2015BL024)and the Natural Science Foundation of Beijing,China(No.2182029).