Nitrite sensor using activated biochar synthesised by microwave-assisted pyrolysis

Waste Disposal & Sustainable Energy Pub Date : 2023-01-17 DOI:10.1007/s42768-022-00120-4

Scarlett Allende, Yang Liu, Muhammad Adeel Zafar, Mohan V. Jacob

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引用次数: 4

Abstract

Developing applications for the by-products obtained from waste processing is vital for resource recovery. The synthesis of ZnCl₂-activated biochar with high electrocatalytic activity was carried out by the microwave-assisted pyrolysis of pineapple peel and subsequent chemical activation process. Activated biochar is employed in the electrochemical sensing of nitrite by drop casting in a glassy carbon electrode (GCE). The activated biochar exhibited a stacked carbon sheet, 254 m² g⁻¹ Brunauer, Emmett and Teller (BET) surface area, 0.076 cm³ g⁻¹ pore volume, 189.53 m² g⁻¹ micropore area and oxygen-containing functional groups. The electrochemical impedance spectroscopy of the modified GCE showed a reduced charge transfer resistance of 61%. This is crucial to determine the electrochemical properties of biochar. The sensor showed a significant current response and an excellent limit of detection of 0.97 µmol L⁻¹. The modified-activated biochar electrochemical sensor demonstrated high selectivity, reproducibility (RSD=2.4%), and stability (RSD=2.6%).

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利用活化生物炭微波辅助热解合成亚硝酸盐传感器

开发废物处理副产品的应用对资源回收至关重要。以凤梨皮为原料，采用微波辅助热解和化学活化法制备了具有高电催化活性的zncl2活化生物炭。通过在玻碳电极(GCE)上滴铸，将活化的生物炭用于亚硝酸盐的电化学传感。活化后的活性炭具有叠层碳片、254 m2 g−1的比表面积、0.076 cm3 g−1的孔体积、189.53 m2 g−1的微孔面积和含氧官能团。电化学阻抗谱表明，改性GCE的电荷转移电阻降低了61%。这对于确定生物炭的电化学性质至关重要。该传感器具有显著的电流响应，检测限为0.97µmol L−1。该传感器具有较高的选择性、重复性(RSD=2.4%)和稳定性(RSD=2.6%)。图形抽象

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Waste Disposal & Sustainable Energy

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