Stripping voltammetric determination of europium via ultraviolet-trigger synthesis of ion imprinted membrane
Stripping voltammetric determination of europium via ultraviolet-trigger synthesis of ion imprinted membrane
复制标题
紫外触发合成离子印迹膜溶出伏安法测定铕
DOI：
10.1016/j.snb.2018.05.127
复制
发表时间：
2018-10-15
影响因子：
8.4
通讯作者：
Cao, Qiue
中科院分区：
文献类型：
--
作者：
Chen, Jin;Bai, Huiping;Cao, Qiue
针对离子印迹膜修饰在玻碳电极表面容易脱落的问题，选择表面比玻碳电极粗糙的丝网印刷电极作为基电极，制备了测定Eu(III)的离子印迹传感器。以羧基多壁碳纳米管(MWCNs-COOH)为信号放大元件，Eu(III)离子印迹膜(Eu(III)-IIM)为特异性识别材料，对固相萃取电极进行修饰，得到传感器。为了避免热引发对SPE的破坏，以偶氮二异丁腈(AIBN)为引发剂，在380 nm处进行自由基光聚合制备了Eu(III)-IIM。用差示脉冲吸附溶出伏安法(DPASV)对Eu3+进行了测定。通过对检测条件的优化，该传感器与Eu3+的浓度在1.0×10~(-7)~1.0×10~(-3)moll~(-1)范围内呈良好的线性关系，检测下限为4.0×10~(-8)moll~(-1)。所得传感器具有良好的再生性、稳定性和实用性，经30次以上使用或在水中放置2个月后仍能保持95%以上的原始响应。该传感器用于水样中铕的测定，相对标准偏差(RSD)小于3.5%(n=5)。
To solve the problem that the ion-imprinted membrane modified on glassy carbon electrode (GCE) usually easily falls off, a screen printed electrode (SPE) which has a relative rough surface than GCE, was selected as the base electrode for preparation of an ion-imprinted sensor for determination of Eu(III). The sensor was obtained by modifying SPE successively with carboxylic multiwalled carbon nanotubes (MWCNs-COOH) as signal amplifying element and Eu(III) ion-imprinted membrane (Eu(III)-IIM) as specific recognition material. To avoid damaging SPE by thermal initiation, the Eu(III)-IIM was prepared via radical photopolymerization at 380 nm using azobisisobutyronitrile (AIBN) as initiator. Differential pulse adsorptive stripping voltammetry (DPASV) was used for determination of Eu3+ by the obtained sensor. After the detection condition was optimized in detail, the sensor showed a linear response to Eu3+ in the concentration range of 1.0 x 10(-7)-1.0 x 10(-3)molL(-1) with the detection limit of 4.0 x 10(-8)molL(-1). The obtained sensor possesses of good regeneration, stability and practicability, it can maintain more than 95% of its original response after used more than 30 times or stored in the water for two months. The satisfactory results with the relative standard deviation (RSD) of less than 3.5% (n = 5) were obtained for the determination of europium in water samples by the novel sensor.