Nanoarchitectonics of hydrothermal carbonized sugarcane juice-derived biochar for high supercapacitance and dye adsorption performance

IF 5.45 Q1 Physics and Astronomy Nano-Structures & Nano-Objects Pub Date : 2024-07-03 DOI:10.1016/j.nanoso.2024.101249

Sandhya V , Rahul Pillai , Ramdas Balan , Vijayaraghavan R , Rangaraj L , Revathi V

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Abstract

Here, we report the exfoliation of micron-sphere biochar to a few layers using the conventional KOH activation process. Micron-sphere biochar is obtained from hydrothermal carbonization (HTC) of sugarcane juice (Saccharum officinarum). HR-TEM and Raman spectroscopy studies revealed the conversion of micron-sphere biochar (MSB) to a few layers of biochar (FLB) in the activation process. BET characterization revealed FLB with a high surface area of 681.21 m²/g having mesopores. Consequently, an electrochemical study demonstrated excellent supercapacitor performance with a specific capacitance of 964.5 F/g and an energy density of 33.11 Wh/kg at a maximum power density of 936 W/kg. Batch adsorption studies showed rapid Methylene blue (MB) dye adsorption in 10 min. The equilibrium data analysis indicated the Langmuir adsorption isotherm with a correlation coefficient of 0.99. Evaluation of the kinetic models suggests that pseudo-second-order kinetics is the most appropriate model, implying that the adsorption of MB dye is primarily due to chemisorption. These findings suggest a Nanoarchitectonics of biochar into a few layers using traditional KOH activation, suitable for various applications.

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水热碳化甘蔗汁衍生生物炭的纳米结构可实现高超级电容和染料吸附性能

在此，我们报告了使用传统的 KOH 活化工艺将微米球状生物炭剥离成几层的情况。微米球生物炭是从甘蔗汁（Saccharum officinarum）的水热碳化（HTC）过程中获得的。HR-TEM 和拉曼光谱研究表明，在活化过程中，微米球状生物炭 (MSB) 转化为几层生物炭 (FLB)。BET 表征显示，FLB 具有 681.21 m2/g 的高表面积和中孔。因此，电化学研究表明这种超级电容器性能优异，比电容为 964.5 F/g，能量密度为 33.11 Wh/kg，最大功率密度为 936 W/kg。批量吸附研究表明，亚甲基蓝（MB）染料可在 10 分钟内被快速吸附。平衡数据分析显示，朗缪尔吸附等温线的相关系数为 0.99。对动力学模型的评估表明，伪二阶动力学是最合适的模型，这意味着 MB 染料的吸附主要是由化学吸附引起的。这些研究结果表明，使用传统的 KOH 活化法将生物炭纳米结构化成几层，适用于各种应用。

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来源期刊

Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .