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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Sustainable Thermochemical Single-Step Process To Obtain Magnetic Activated Carbons from Chestnut Industrial Wastes
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Sustainable Thermochemical Single-Step Process To Obtain Magnetic Activated Carbons from Chestnut Industrial Wastes

机译：可持续的热化学单步工艺，从板栗工业废物中获得磁性活性炭

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摘要

A novel thermochemical process based on a single step was optimized to obtain magnetic activated carbons from an industrial biomass waste. Anhydrous iron chloride was used as an activating agent and mixed directly with the chestnut shell waste. The effect of the activation temperature (220-800 degrees C) on the chemical, morphological, textural, and magnetic properties of the materials was studied. The results demonstrated the presence of different iron compounds depending on the activation temperature set as well as their influence on morphological and textural development of the magnetic activated carbons (BET specific surface area, S-BET, up to 568 m(2) g(-1), total pore volume, V-TOT, up to 0.294 cm(3) g(-1) vs 1 m(2) g(-1) and 0.007 cm(3)g(-1), respectively, for the raw biomass waste). The techniques employed, especially Mossbauer spectroscopy, showed relative contributions of the different iron compounds (magnetite, maghemite, metallic iron, and so on) in the materials. The higher activation temperature (800 degrees C) favored the formation of metal Fe and iron carbide. Additionally, the magnetic properties measured by vibrating sample magnetometry confirmed the coexistence of different ferromagnetic phases with the remanent magnetization, M-R, (up to 3.88 emu/g) and coercivity, H-c (up to 140 Oe), being larger as the activation temperature increases. A higher activation temperature favored the development and evolution toward other iron compounds, while at low temperature, 220 degrees C, the presence of these compounds were null, and their behavior resembled the results obtained for the original biomass waste.
机译：优化基于单一步骤的新型热化学过程，从工业生物质废物中获得磁性活性炭。使用无水氯化铁作为活化剂并直接与栗子壳废物混​​合。研究了活化温度（220-800℃）对材料的化学，形态，纹理和磁性的影响。结果证明了不同铁化合物的存在，这取决于激活温度设定，以及它们对磁性活性碳的形态学和纹理发展的影响（BET比表面积，S-BET，高达568米（2）G（ - ） 1），总孔体积，V-Tot，高达0.294cm（3）克（3）克（-1）vs1m（2）g（-1）和0.007cm（3）g（-1），用于原料生物量废物）。所用技术，尤其是Mossbauer光谱，显示出材料中不同铁化合物（磁铁矿，磁石，金属铁等）的相对贡献。较高的活化温度（800℃）赞成形成金属Fe和碳化铁的形成。另外，通过振动样品磁体测量的磁性确认了不同铁磁相的共存随着搅拌磁化，MR，（高达3.88 emu / g）和矫顽力，HC（高达140个OE），随着激活温度的增加而较大。较高的活化温度赞成对其他铁化合物的显影和进化，而在低温下，220℃，这些化合物的存在是零的，并且它们的行为类似于原始生物质废物的结果。

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