中草药渣的再利用：废青蒿杆衍生的多孔碳作为一种低成本吸附剂用于去除甲基橙。
Re-utilization of Chinese medicinal herbal residue: waste wormwood rod-derived porous carbon as a low-cost adsorbent for methyl orange removal.
机构信息
Hubei Key Lab for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, Hubei 438000, China E-mail:
Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, Three Gorges University, Yichang, Hubei 443002, China.
出版信息
Water Sci Technol. 2021 Nov;84(9):2601-2614. doi: 10.2166/wst.2021.453.
A cost-effective approach was applied to prepare porous carbon samples by the simple carbonization of wormwood rod followed by salt activator (NaCl) activation. The effect of preparation parameters on the characteristics of the wormwood rod-based porous carbons (WWRs) were studied. The properties of these samples were investigated by SEM, BET surface area, X-ray diffraction, FT-IR spectra and X-ray photoelectron spectrometer. The prepared WWRs were applied as new adsorbent materials to remove methyl orange (MO). The experimental results indicated that WWR-800 activated at 800 °C possesses the best adsorption performance. Several factors that affected the adsorption property of the system such as the solution pH, dosing of adsorbent, initial dye concentration and ionic strength were examined. In addition, the thermodynamic parameters and kinetic parameters of MO with WWR-800 were studied. The results indicated that the adsorption of MO on WWR-800 was an endothermic process and non-spontaneous under standard conditions. The maximum equilibrium adsorption capacity of MO on WWR-800 was 454.55 mg/g. After five adsorption/desorption cycles, the adsorption capacity of MO on WWR-800 remained at 94%, which indicated that wormwood rod-based porous carbon possessed good reusability.
采用一种经济有效的方法，通过简单的艾草棒碳化，然后用盐活化剂（NaCl）进行活化，制备多孔碳样品。研究了制备参数对基于艾草棒的多孔碳（WWR）特性的影响。通过 SEM、BET 比表面积、X 射线衍射、FT-IR 光谱和 X 射线光电子能谱对这些样品的性能进行了研究。所制备的 WWR 被用作新型吸附剂材料来去除甲基橙（MO）。实验结果表明，在 800°C 下活化的 WWR-800 具有最佳的吸附性能。考察了影响体系吸附性能的几个因素，如溶液 pH 值、吸附剂用量、初始染料浓度和离子强度。此外，还研究了 MO 与 WWR-800 的热力学参数和动力学参数。结果表明，MO 在 WWR-800 上的吸附是一个吸热过程，在标准条件下是非自发的。MO 在 WWR-800 上的最大平衡吸附容量为 454.55mg/g。经过五次吸附/解吸循环后，WWR-800 对 MO 的吸附容量仍保持在 94%，表明艾草棒基多孔碳具有良好的可重复使用性。
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