石墨烯
吸附
检出限
胶体金
水溶液
膜
量子点
滤纸
分析化学(期刊)
相(物质)
材料科学
感应耦合等离子体
双水相体系
化学
纳米颗粒
色谱法
纳米技术
有机化学
等离子体
物理
量子力学
生物化学
作者
Suphakan Thanomsak,Chanunporn Insombat,Phutita Chaiyo,Thawatchai Tuntulani,Wanwisa Janrungroatsakul
出处
期刊:Analytical Methods
[The Royal Society of Chemistry]
日期:2021-01-01
卷期号:13 (40): 4785-4792
被引量:2
摘要
A novel paper-based sensor using graphene quantum dots (GQDs) as a colorimetric probe for Au3+ determination has been developed. The paper sensor was fabricated by the adsorption of GQDs onto cellulose filter paper and then coating with a PVC membrane. The PVC membrane was plasticized with o-NPOE containing potassium tetrakis(4-chlorophenyl)borate (KTpClPB) as a lipophilic cation-exchanger. According to the ion-exchanged mechanism between the lipophilic phase and aqueous phase, Au3+ in the aqueous solution was extracted to the lipophilic phase on the paper layer. Then, adsorbed GQDs on the paper could selectively reduce Au3+ to elemental gold (Au0). The generated gold nanoparticles (AuNPs) resulted in the color of the paper turning from pale yellow to pink, which was recorded by using CIE L*a*b* color space. Under optimized conditions, the change in the color difference (ΔE) was related to the concentration of Au3+ in a working linear range of 200-1000 μM and the detection limit was found to be 70 μM. The proposed sensor was successfully applied to the determination of Au3+ in real water samples. The results were in favorable agreement with standard inductively coupled plasma-optical emission spectrometry (ICP-OES) results.
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