Central Metallurgical Research and Development Institute, P.O. Box: 87, Helwan, 11421, Cairo, Egypt.
Mining and Metallurgy Engineering Department, Tabbin Institute for Metallurgical Studies (TIMS), Tabbin, 109, Helwan, Cairo, 11421, Egypt.
J Environ Manage. 2022 Feb 15;304:114222. doi: 10.1016/j.jenvman.2021.114222. Epub 2021 Dec 3.
Leather tanning operations create a large amount of solid and liquid waste from tanning, wherein Cr(III) compounds are used to produce wet blue leather. In this study, activated carbon (AC) generated from leather waste (LW) was evaluated for supercapacitor (SC) applications. AC was produced through carbonization at a temperature range of 700°C-900 °C, followed by chemical activation. The morphological characteristics of the AC samples revealed a certain degree of porosity and a maximum surface area of 381 m g. X-ray diffraction and EDX examination showed the existence of graphitic planes in the LW-derived AC. Raman, FT-IR, and XPS confirmed the defect nature and surface functional groups of the AC samples. A three-electrode approach was employed to assess the electrochemical characteristics of the AC samples. The supreme capacitance of a sample (LW700) at 1 A/g was 550 F g (237 C g) in a 6 M KOH electrolyte. All the electrochemical results (CV, GCD, and Nyquist curves) demonstrated that the LW carbon possessed a high specific capacitance and electrochemical cycle constancy, and hence is appropriate for SC fabrication. These desirable capacitive performances enable solid leather waste-derived carbons as a source of new materials for low-cost energy storage supercapacitors. This work put forwards a new concept of 'waste to value-added products' that can be a helping hand for leather industries and its solid waste management disposal problems.
制革过程中鞣制会产生大量的固体和液体废物，其中 Cr(III) 化合物用于生产湿蓝皮。本研究评估了皮革废料（LW）制备的活性炭（AC）在超级电容器（SC）中的应用。AC 通过在 700°C-900°C 的温度范围内碳化，然后进行化学活化来制备。AC 样品的形态特征显示出一定程度的孔隙率和最大比表面积为 381 m g。X 射线衍射和 EDX 检查表明 LW 衍生 AC 中存在石墨平面。拉曼、FT-IR 和 XPS 证实了 AC 样品的缺陷性质和表面官能团。采用三电极法评估 AC 样品的电化学特性。在 6 M KOH 电解质中，样品（LW700）在 1 A/g 时的最高电容为 550 F g（237 C g）。所有电化学结果（CV、GCD 和 Nyquist 曲线）表明，LW 碳具有高比电容和电化学循环稳定性，因此适用于 SC 制造。这些理想的电容性能使固体皮革废料衍生的碳成为低成本储能超级电容器新材料的来源。这项工作提出了一个新的概念，即“废物变增值产品”，可以为皮革行业及其固体废物管理处置问题提供帮助。
