Di-branched triphenylamine dye sensitized TiO2 nanocomposites with good photo-stability for sensitive photoelectrochemical detection of organophosphate pesticides
Di-branched triphenylamine dye sensitized TiO2 nanocomposites with good photo-stability for sensitive photoelectrochemical detection of organophosphate pesticides
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具有良好光稳定性的二支化三苯胺染料敏化 TiO2 纳米复合材料用于有机磷农药的灵敏光电化学检测
DOI：
10.1016/j.aca.2017.11.071
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发表时间：
2018-02-25
影响因子：
6.2
通讯作者：
Yuan, Jingli
中科院分区：
文献类型：
--
作者：
Song, Jie;Wu, Shuo;Yuan, Jingli
本文以三苯胺为电子给体，噻吩为电子转移π桥，丙烯酸为受体和锚定基团，合成了一种二支化的双锚定染料T（TA）（2），并将其与纳米TiO 2偶联，用于有机磷农药的高灵敏光电化学分析。在中性缓冲溶液中，T（TA）（2）对TiO 2纳米粒子表现出良好的锚定稳定性。在中性Tris-HCl和磷酸盐缓冲溶液中，T（TA）（2）-TiO 2纳米复合材料在2 h的连续光照下，其初始光电流分别保持99.7%和85.9%。在Tris-HCl溶液中连续照射期间，没有观察到T（TA）（2）从TiO 2纳米颗粒上的降解或解吸。其稳定性上级优于单分支、以氰基丙烯酸为锚定基团或π桥中不含噻吩的类似物，也优于Ru（II）配合物N719和卟啉染料敏化的TiO 2纳米复合物。该复合材料对抗坏血酸和硫代胆碱（TCh）的氧化也表现出很强的光催化能力。由于OPs是乙酰胆碱酯酶（AChE）的酶解产物，且AChE的活性可被OPs抑制，因此进一步将T（TA）（2）-TiO 2/FTO用于OPs的PEC测定。使用双硫磷作为模型分析物，PEC方法显示出2 x 10（-12）-4 x 10（-6）g mL（-1）的宽线性范围和5.6 x 10（-13）g mL（-1）的极低检测限。对于这些良好的分析性能，本研究可以提供一些指导，并铺平了道路，染料-二氧化钛纳米复合材料在许多PEC器件需要在水溶液中进行。(c)2017爱思唯尔B. V.保留所有权利。
Herein, a di-branched di-anchoring dye, T(TA)(2), with triphenylamine as electron donor, thiophene as electron transfer pi-bridge, and acrylic acid as both acceptor and anchoring groups, was synthesized and coupled with TiO2 nanoparticles for the highly sensitive photoelectrochemical (PEC) assay of organophosphate pesticides (OPs). The T(TA)(2) exhibited good anchoring stability to TiO2 nanoparticles in neutral buffer solutions. Under 2 h continual irradiation, the T(TA)(2)-TiO2 nanocomposites respectively kept 99.7% and 85.9% of their initial photocurrents in neutral Tris-HCl and phosphate buffer solutions. Neither degradation nor desorption of T(TA)(2) from TiO2 nanoparticles was observed during the continual irradiation in the Tris-HCl solutions. The stability was not only superior to its analogues either possessing one branch, with cyanoacrylic acid as anchoring groups, or without thiophene in the pi-bridge, but also better than the Ru(II) complex N719 and the porphyrin dye sensitized TiO2 nanocomposites. The nanocomposites also showed highly photocatalytic ability towards the oxidation of ascorbic acid and thiocholine (TCh). Since the latter is the enzymatic hydrolysis product of acetylcholinesterase (AChE) and the activity of AChE can be inhibited by OPs, the T(TA)(2)-TiO2/FTO was further used for PEC assay of OPs. Using parathion as a model analyte, the PEC method showed a wide linear range from 2 x 10(-12) -4 x 10(-6) g mL(-1) and an extremely low limit of detection of 5.6 x 10(-13) g mL(-1). Regarding these good analytical performances, this study may provide some guidance and pave the way for the applications of dye-TiO2 nanocomposites in a lot of PEC devices required to be performed in aqueous solutions. (c) 2017 Elsevier B.V. All rights reserved.