Ultrasensitive colorimetric determination of silver(I) based on the peroxidase mimicking activity of a hybrid material composed of graphitic carbon nitride and platinum nanoparticles
Ultrasensitive colorimetric determination of silver(I) based on the peroxidase mimicking activity of a hybrid material composed of graphitic carbon nitride and platinum nanoparticles
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基于石墨氮化碳和铂纳米颗粒组成的混合材料的过氧化物酶模拟活性超灵敏比色测定银（I）
DOI：
10.1007/s00604-018-2816-4
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发表时间：
2018-04
影响因子：
5.7
通讯作者：
Zhang Lan
中科院分区：
文献类型：
--
作者：
Tang Shurong;Wang Meili;Li Guangwen;Li Xin;Chen Wei;Zhang Lan
摘要利用石墨碳氮化物（g-C3 N4）和具有过氧化物酶模拟活性的铂纳米粒子（PtNPs）组成的杂化材料，设计了一种快速、灵敏、低成本的比色法测定Ag（I）。g-C3 N4-PtNPs杂化物通过在超声处理下和在g-C3 N4存在下使用硼氢化钠还原氯铂酸来合成。该杂化物可催化氧化3，3 ′，5，5 ′-四甲基联苯胺（TMB）生成蓝色产物，其最大吸收波长为652 nm。在添加Ag（I）时并且在柠檬酸的存在下，其将在PtNP的催化作用下被还原以形成Ag（0）。然后，Ag（0）被吸附在g-C3 N4-PtNP的表面上。这导致杂合体的酶模拟活性的抑制。因此，由TMB形成的蓝色产物较少。在最佳条件下，Ag（I）可以在0.05-5.0 nM浓度范围内定量，检测限为22 pM。该方法快速、可靠，可用于真实的水样中Ag（I）的测定。
由石墨碳氮化物和铂纳米颗粒（g-C3 N4-PtNPs）组成的混合纳米材料可以催化四甲基联苯胺（TMB）的氧化以产生蓝色产物（TMBox）。该杂交体的酶模拟活性被Ag+抑制，从而减少了TMB的蓝色产物的产生。
AbstractA hybrid material composed of graphitic carbon nitride (g-C3N4) and platinum nanoparticles (PtNPs) with peroxidase mimicking activity was used to design a rapid, sensitive and low-cost colorimetric method for the determination of Ag(I). The g-C3N4-PtNPs hybrid was synthesized by reduction of chloroplatinic acid using sodium borohydride under ultrasonication and in the presence of g-C3N4. The hybrid can catalyze the oxidation 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue-colored product with an absorption maximum at 652 nm. On addition of Ag(I) and in the presence of citric acid, it will be reduced to form Ag(0) under the catalytic action of PtNPs. Ag(0) is then adsorbed on the surface of the g-C3N4-PtNPs. This results in the inhibition of the enzyme mimetic activity of the hybrid. Hence, less blue product will be formed from TMB. Under optimum conditions, Ag(I) can be quantified in the 0.05–5.0 nM concentration range with a 22 pM detection limit. This assay is rapid and reliable and was applied to the determination of Ag(I) in spiked real water samples.
Graphical abstractA hybrid nanomaterial consisting of graphitic carbon nitride and platinum nanoparticles (g-C3N4-PtNPs) can catalyze the oxidation of tetramethylbenzidine (TMB) to produce a blue-colored product (TMBox). The enzyme mimetic activity of the hybrid is inhibited by Ag+, thereby decreasing the generation of blue product from TMB.
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影响因子：
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