Biswas Rima, Ghosh Debojit, Das Samarpita, Chatterjee Sauvik, Bhaduri Samanka Narayan, Bhaumik Asim, Biswas Papu
Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal 711 103, India.
School of Material Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal 700 032, India.
Inorg Chem. 2023 Jul 24;62(29):11426-11435. doi: 10.1021/acs.inorgchem.3c00996. Epub 2023 Jul 7.
Sulfite (SO) is considered a highly toxic anion for living organisms. Herein, we report the synthesis of copper immobilized over a 2D hexagonally ordered mesoporous silica material CuMS as an electrochemical and colorimetric dual-technique-based sensing platform for sulfite detection. The immobilization of copper on silica was achieved through the bis[3-(triethoxysilyl)propyl]tetrasulfide (TEPTS) ligand. Morphological and physical properties of the material were confirmed by several characterization techniques, including scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N sorption, and X-ray photoelectron spectroscopy. The CuMS material retained mesoporosity with a narrow pore size distribution ( ≈ 5.4 nm) and a high Brunauer-Emmett-Teller surface area of 682 m g after the immobilization of copper. The prepared catalyst shows promising electrocatalytic activity toward sulfite oxidation. A linear variation in the peak current was obtained for SO oxidation in the 0.2-15 mM range with a high sensitivity of 62.08 μA cm, under optimum experimental conditions. The limit of detection (LOD) was found to be 1.14 nM. CuMS also shows excellent activity toward colorimetric detection of sulfite anions with an LOD of 0.4 nM. The proposed sensor shows high selectivity toward the sulfite anion, even in the presence of common interferents. The detection of sulfite in white wine with excellent recovery demonstrates the practical applicability of this sensor.
亚硫酸盐（SO）被认为是对生物具有高毒性的阴离子。在此，我们报道了一种固定在二维六方有序介孔二氧化硅材料CuMS上的铜的合成，作为基于电化学和比色双技术的亚硫酸盐检测传感平台。通过双[3-(三乙氧基硅基)丙基]四硫化物（TEPTS）配体实现了铜在二氧化硅上的固定。通过几种表征技术，包括扫描电子显微镜、透射电子显微镜、X射线衍射、N吸附和X射线光电子能谱，证实了该材料的形态和物理性质。在固定铜之后，CuMS材料保留了介孔结构，孔径分布狭窄（约5.4 nm），布鲁诺尔-埃米特-泰勒表面积高达682 m²/g。制备的催化剂对亚硫酸盐氧化表现出有前景的电催化活性。在最佳实验条件下，亚硫酸盐在0.2 - 15 mM范围内氧化时，峰电流呈线性变化，灵敏度高达62.08 μA/cm²。检测限（LOD）为1.14 nM。CuMS对亚硫酸根阴离子的比色检测也表现出优异的活性，LOD为0.4 nM。所提出的传感器即使在存在常见干扰物的情况下，对亚硫酸根阴离子也表现出高选择性。在白葡萄酒中亚硫酸盐的检测具有出色的回收率，证明了该传感器的实际适用性。
