用于现场测定水下有机污染物的 SERS 响应 DGT 传感装置,ACS Sensors

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用于现场测定水下有机污染物的 SERS 响应 DGT 传感装置
ACS Sensors ( IF 8.2 ) Pub Date : 2023-10-09 , DOI: 10.1021/acssensors.3c01169
Yunshu Lu ₁ , Changwei Li _{2,

3} , Yun Wang ₁ , Ziyue Wang ₁ , Chang Liu ₄ , Hongtao Fan ₅ , Ting Sun ₁

Affiliation

尽管薄膜技术（DGT）中的扩散梯度在环境分析中受到高度重视，但传统的DGT装置不能用作传感装置，只能用作原位采样装置。在这里，我们报告了一种表面增强拉曼散射 (SERS) 响应 DGT 传感装置（SERS-DGT 传感器），能够现场测定水下有机污染物。这是通过创新性地利用氧化石墨烯 (AuNPs@GO) 负载的金纳米粒子的 SERS 响应液体悬浮液作为 DGT 结合相来实现的。通过二次生长和分子焊接相结合的方法合成液体悬浮液，并用作 DGT 结合相 AuNPs@GO 表现出良好的 SERS 活性、水稳定性和吸附性能。基于24-144小时的显色时间范围，SERS-DGT传感器对磺胺嘧啶(SMT)的测量在0.3289-2631 ng mL ^–1的浓度范围内进行评估。SERS-DGT 进样器适用于在多种环境条件下测量 SMT（即 pH 5–9、离子强度 0.0001–0.05 mol L ^–1 NaCl、DOM 浓度 0–100 mg L ^–1、TC 值）：SMT ≤ 20 和 MNZ：SMT ≤ 20)。将SERS-DGT传感器应用于生猪养殖废水中SMT含量的实际测试，并与抓样取样方法进行比较，结果证实这种新型联用技术具有良好的准确度和精密度。该平台被证明具有多功能性，可将该方法扩展到罗丹明 6G、甲硝唑、氟西汀和恩诺沙星的监测。本文提出的SERS-DGT传感器是一种直接现场传感有机DGT的平台，在多种有机物的原位采样和现场传感方面具有巨大潜力，为环境监测提供了新思路。

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A SERS Responsive DGT Sensing Device for On-Site Determination of Organic Contaminants Underwater

Although diffusion gradient in the thin-film technique (DGT) is highly regarded in environmental analysis, the traditional DGT devices cannot serve as sensing devices but in situ sampling devices. Here we report a surface enhanced Raman scattering (SERS) responsive DGT sensing device (SERS-DGT Sensor) capable of on-site determination of organic contaminants underwater. This is achieved by innovatively utilizing a SERS responsive liquid suspension of Au nanoparticles supported on graphene oxide (AuNPs@GO) as the DGT binding phase. Liquid suspension is synthesized via a combined secondary growth and molecular welding approach and used as DGT binding phase AuNPs@GO exhibit good SERS activity, aqueous stability, and adsorption performance. Based on the development time range of 24–144 h, the measurement of sulfadiazine (SMT) by SERS-DGT Sensor is evaluated in the concentration range of 0.3289–2631 ng mL^–1. The SERS-DGT sampler is valid for measuring SMT under a wide range of environmental conditions (i.e, pH 5–9, ionic strength 0.0001–0.05 mol L^–1 NaCl, DOM concentrations 0–100 mg L^–1, the values of TC: SMT ≤ 20 and MNZ: SMT ≤ 20). SERS-DGT Sensor is applied to the practical test of SMT content in pig breeding wastewater, and compared with the grab sampling method, the results confirm that this novel hyphenated technique exhibits good accuracy and precision. The platform proves to be versatile by extending the method to the monitoring of rhodamine 6G, metronidazole, fluoxetine, and enrofloxacin. In this article, SERS-DGT Sensor, a platform for directly on-site sensing of organic DGT, holds great potential for in situ sampling and on-site sensing for a wide range of organics and provides a new idea for environmental monitoring.

更新日期：2023-10-09

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