Coconut shell activated biochar/magnetite/dimethylglyoxime composite for selective and sensitive detection of Ni2+

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-10-17 DOI:10.1016/j.vacuum.2025.114835

Henry Setiyanto , Wirhamna , Vienna Saraswaty , Tania Amara Dewi , Dina Marlina Oktavia , Mega Wijayanti Kusumadewi , Indra Noviandri , Ria Sri Rahayu , Muhammad Yudhistira Azis , Handajaya Rusli , Samitha Dewi Djajanti

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引用次数: 0

Abstract

This study presents the fabrication of a carbon paste electrode (CPE) modified with a composite of coconut shell–derived activated biochar (CSAB), magnetite (Mag), and dimethylglyoxime (DMG) for the electrochemical detection of Ni²⁺. The CSAB was synthesized via pyrolysis and chemically activated using nitric acid, yielding a porous carbonaceous material with abundant surface functionalities. Acting as a conductive matrix, CSAB enhances electron transfer and provides a high surface area as well as adsorption sites for Ni²⁺ preconcentration. Mag nanoparticles were incorporated to improve electron transfer kinetics, while DMG served as a selective chelating agent for Ni²⁺ ions. Characterization by XRD, FTIR, and SEM confirmed the structural and morphological features of CSAB. Electrochemical studies using cyclic voltammetry and square wave voltammetry revealed a well-defined redox response, with the CSAB/Mag/DMG-CPE exhibiting significantly enhanced current signals compared to the bare CPE. The sensor demonstrated a low limit of detection of 1.27 nM, with a good linearity (R² = 0.9986), and was highly selective in the presence of up to 100-fold concentrations of potential interfering ions. These results underscore the potential of biochar-based composites as sustainable, low-cost electrode modifiers for heavy metal sensing applications.

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椰壳活化生物炭/磁铁矿/二甲基乙氧肟复合材料选择性灵敏检测Ni2+

本研究制备了一种由椰子壳衍生的活性生物炭（CSAB）、磁铁矿（Mag）和二甲基乙肟（DMG）复合改性的碳糊电极（CPE），用于Ni2+的电化学检测。通过热解合成CSAB，并使用硝酸进行化学活化，得到具有丰富表面功能的多孔碳质材料。作为导电基质，CSAB增强了电子转移，提供了高表面积和Ni2+预富集的吸附位点。镁纳米粒子可以改善电子转移动力学，而DMG可以作为Ni2+离子的选择性螯合剂。通过XRD、FTIR、SEM等表征证实了CSAB的结构和形态特征。使用循环伏安法和方波伏安法进行的电化学研究表明，CSAB/Mag/DMG-CPE具有明确的氧化还原反应，与裸CPE相比，CSAB/Mag -CPE表现出明显增强的电流信号。该传感器的检测下限为1.27 nM，线性度良好（R2 = 0.9986），在潜在干扰离子浓度高达100倍的情况下具有很高的选择性。这些结果强调了生物炭基复合材料作为可持续的、低成本的重金属传感电极修饰剂的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.