一种用于检测铅（II）离子的电化学传感器，使用经二氧化钛纳米颗粒改性的咖啡渣生物炭。

An Electrochemical Sensor for Detection of Lead (II) Ions Using Biochar of Spent Coffee Grounds Modified by TiO Nanoparticles.

作者信息

Liu Zaiqiong, Xu Yiren, Kan Xurundong, Chen Mei, Dai Jingyang, Zhang Yanli, Pang Pengfei, Ma Wenhui, Zhang Jianqiang

机构信息

International Union Laboratory of China and Malaysia for Quality Monitoring and Evaluation of Agricultural Products in Yunnan, School of Biology and Chemistry, Pu'er University, Pu'er 665000, China.

School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China.

出版信息

Molecules. 2024 Dec 3;29(23):5704. doi: 10.3390/molecules29235704.

Toxic heavy metal ions, such as lead ions, significantly threaten human health and the environment. This work introduces a novel method for the simple and sensitive detection of lead ions based on biochar-loaded titanium dioxide nanoparticles (BC@TiONPs) nanocomposites. Eco-friendly biochar samples were prepared from spent coffee grounds (500 °C, 1 h) that were chemically activated with TiO nanoparticles (150 °C, 24 h) to improve their conductivity. Structural characterizations showed that BC@TiONPs have a porous structure. The BC@TiONPs material was evaluated for lead ion determination by assembling glassy carbon electrodes. Under optimal conditions, the sensor was immersed in a solution containing the analyte (0.1 M NaAc-HAc buffer, pH = 4.5) for the detection of lead ions via differential pulse voltammetry. A linear dynamic range from 1 pM to 10 μMwas achieved, with a detection limit of 0.6268 pM. Additionally, the analyte was determined in tap water samples, and a satisfactory recovery rate was achieved.

有毒重金属离子，如铅离子，对人类健康和环境构成重大威胁。本研究介绍了一种基于生物炭负载二氧化钛纳米颗粒（BC@TiONPs）纳米复合材料的简单灵敏检测铅离子的新方法。采用废弃咖啡渣（500℃，1h）制备了环境友好型生物炭样品，并用TiO纳米颗粒（150℃，24h）对其进行化学活化以提高其导电性。结构表征表明BC@TiONPs具有多孔结构。通过组装玻碳电极对BC@TiONPs材料进行铅离子测定评估。在最佳条件下，将传感器浸入含有分析物的溶液（0.1M NaAc-HAc缓冲液，pH = 4.5）中，通过差分脉冲伏安法检测铅离子。实现了1 pM至10 μM的线性动态范围，检测限为0.6268 pM。此外，还对自来水样品中的分析物进行了测定，并获得了令人满意的回收率。