Hydrothermal Synthesis of Biomass-Derived Magnetic Carbon Composites for Adsorption and Catalysis.
Hydrothermal Synthesis of Biomass-Derived Magnetic Carbon Composites for Adsorption and Catalysis.
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DOI：
10.1021/acsomega.1c05116
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发表时间：
2021-12-07
期刊：
影响因子：
4.1
通讯作者：
McGregor J
中科院分区：
文献类型：
--
作者：
Davies G;McGregor J
首次以废弃鳄梨籽为原料，采用水热碳化法合成了磁性铁碳复合材料。这些材料被证明在吸附和催化应用中是有效的，其性能相当于或高于通过常规加工路线生产的材料。鳄梨种子在高温水（230 °C）中在高压（室温下30巴）下在硝酸铁和硫酸铁的存在下进行加工，模拟自然煤化过程。通过X射线衍射（XRD）、原子吸收光谱（AAS）、X射线荧光（XRF）、X射线光电子能谱（XPS）、电感耦合等离子体发射光谱（ICP-OES）、傅里叶变换红外光谱（FT-IR）、磁力计和通过表面积测量对合成的材料进行表征。观察到负载的铁颗粒主要是磁铁矿，表面区域有氧化的赤铁矿。铁的存在催化鳄梨种子衍生碳中延伸的有序聚合物结构的形成。磁性Fe/C吸附剂已被证明是一种吸附剂，用于亚甲基蓝和靛蓝胭脂红的环境废水处理。动力学分析表明，吸附物的化学吸附，与正表面电荷的Fe/C是优先靛蓝胭脂红吸附（49毫克g-1）。此外，Fe/C已被评估为用于苯乙炔与乙二醇的氢烷氧基化为2-苄基-1，3-二氧戊环的非均相催化剂。获得45%的产物产率，对所形成的异构体具有100%的区域选择性。该固体催化剂的优点是由废料制备，反应后易于通过磁力分离去除。这些发展提供了从各种各样的木质纤维素生物质原料生产用于各种高价值应用的碳基材料的机会，潜在地还包括能量储存和生物制药。
The synthesis of magnetic iron–carbon composites (Fe/C) from waste avocado seeds via hydrothermal carbonization (HTC) has been demonstrated for the first time. These materials are shown to be effective in adsorption and catalytic applications, with performances comparable to or higher than materials produced through conventional processing routes. Avocado seeds have been processed in high-temperature water (230 °C) at elevated pressure (30 bar at room temperature) in the presence of iron nitrate and iron sulfate, in a process mimicking natural coalification. Characterization of the synthesized material has been carried out by X-ray diffraction (XRD), atomic absorption spectroscopy (AAS), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-optical emission spectrometry (ICP-OES), Fourier-transform infrared spectroscopy (FT-IR), magnetometry, and through surface area measurements. The supported iron particles are observed to be predominately magnetite, with an oxidized hematite surface region. The presence of iron catalyzes the formation of an extended, ordered polymeric structure in the avocado seed-derived carbon. The magnetic Fe/C has been demonstrated as an adsorbent for environmental wastewater treatment using methylene blue and indigo carmine. Kinetic analysis suggests that the adsorbates are chemisorbed, with the positive surface charge of Fe/C being preferential for indigo carmine adsorption (49 mg g–1). Additionally, Fe/C has been evaluated as a heterogeneous catalyst for the hydroalkoxylation of phenylacetylene with ethylene glycol to 2-benzyl-1,3-dioxolane. Product yields of 45% are obtained, with 100% regioselectivity to the formed isomer. The solid catalyst has the advantages of being prepared from a waste material and of easy removal after reaction via magnetic separation. These developments provide opportunities to produce carbon-based materials for a variety of high-value applications, potentially also including energy storage and biopharmaceuticals, from a wide range of lignocellulosic biomass feedstocks.
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