Preparation of Nitrate Bilayer Membrane Ion-Selective Electrode Modified by Pericarpium Granati-Derived Biochar and Its Application in Practical Samples

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2023-02-16 DOI:10.1007/s12678-023-00812-3

Fozia, Guangyao Zhao, Yanhong Nie, Jianrong Jiang, Qian Chen, Chaogang Wang, Xu Xu, Ming Ying, Zhangli Hu, Hong Xu

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引用次数: 1

Abstract

In this study, a pericarpium granati-derived biochar with phosphoric acid activation (PGCP) was prepared, characterized, and applied together with polypyrrole (PPy) to modify a glass carbon electrode (GCE) to construct a bilayer membrane nitrate ion-selective electrode (ISE, PPy/PGCP/GCE). The morphological results showed that PGCP possessed a porous structures. X-ray photoelectron spectroscopy analysis indicated that phosphorus added in PGCP was in the forms of P-O and P–C. The electrochemical impedance spectrum of the fabricated nitrate ISE showed a very low impedance, suggesting that PGCP can be used as an effective electron transfer mediator. The open circuit potential experiments indicated that the fabricated nitrate ISE exhibited a good linear potentiometric response to nitrate over a wide concentration range of 1 × 10⁻⁵ to 5 × 10⁻¹ mol·L⁻¹ with Nernstian slope of 50.86 mV·dec⁻¹ at pH range of 3.5–9.5 and a short response time of less than 7.3 s. Its limit of detection (LOD) was determined to be 4.64 × 10⁻⁶ mol·L⁻¹. Both detection range and LOD are comparable or better than those of reported similar modified electrodes. The fabricated nitrate ISE exhibited a high selectivity with a good repeatability and stability. The selectivity sequence was determined as NO₃⁻ > NO₂⁻ > Cl⁻ > H₂PO₄⁻ > CH₃COO⁻ > CO₃²⁻ > SO₄²⁻. The fabricated nitrate ISE was validated by the nitrate detections of real samples from Shenzhen OCT wetland and laboratory wastewater, respectively, with the obtained detection discrepancy of less than 4% (RSD). This study provides useful reference information for the development of novel ISE in clinical laboratories and environmental monitoring.

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草皮生物炭修饰硝酸盐双层膜离子选择电极的制备及其在实际样品中的应用

摘要本研究制备了一种具有磷酸活化作用的糙皮生物炭(PGCP)，对其进行了表征，并与聚吡咯(PPy)一起修饰了玻璃碳电极(GCE)，构建了双层膜硝酸盐离子选择电极(ISE, PPy/PGCP/GCE)。形态学结果表明，PGCP具有多孔结构。x射线光电子能谱分析表明，添加在PGCP中的磷以P-O和P-C的形式存在。制备的硝酸钾ISE的电化学阻抗谱显示出很低的阻抗，表明PGCP可以作为有效的电子传递介质。开路电位实验表明，在pH为3.5 ~ 9.5的范围内，硝酸盐在1 × 10−5 ~ 5 × 10−1 mol·L−1的浓度范围内具有良好的线性电位响应，Nernstian斜率为50.86 mV·dec−1，响应时间短，小于7.3 s。其检出限为4.64 × 10−6 mol·L−1。检测范围和LOD与报道的同类修饰电极相当或更好。所制备的硝酸碘化酶选择性高，重复性好，稳定性好。选择顺序为NO3−> NO2−> Cl−> H2PO4−> CH3COO−> CO32−> SO42−。通过对深圳OCT湿地和实验室废水的实际样品进行硝酸盐检测，验证了所制备的硝酸盐ISE，检测误差小于4% (RSD)。本研究为新型ISE在临床实验室和环境监测中的发展提供了有用的参考信息。

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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