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首页> 外文期刊>RSC Advances >Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes
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Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

机译：将水葫芦（凤眼凤梨）绿色环保地实现零废物转化为优质的磁性碳复合吸附剂和超级电容器电极

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Troublesome aquatic weed, water hyacinth ( Eichhornia crassipes ) was converted into solid and liquid fractions via green and energy-saving hydrothermal carbonization (HTC). The solid product, hydrochar, was employed as a precursor to prepare magnetic carbon materials by simple activation and magnetization using KOH and Fe ~(3+) ions, respectively. The obtained magnetic adsorbent possessed good magnetic properties and presented outstanding capacities to adsorb methylene blue (524.20 mg g ~(?1) ), methyl orange (425.15 mg g ~(?1) ) and tetracycline (294.24 mg g ~(?1) ) with rapid adsorption kinetics even at high concentrations (up to 500 mg L ~(?1) ), attributed to high specific surface area and mesopore porosity. Besides the solid hydrochar, the water-soluble liquid product was used to fabricate carbon-based supercapacitors through facile KOH activation with a considerably lower KOH amount in comparison to conventional activation. The supercapacitor electrode made from activated liquid product possessed an extremely high specific surface area of 2545 cm ~(2) g ~(?1) and showed excellent specific capacitance (100 F g ~(?1) or 50 F cm ~(?3) at 1 A g ~(?1) ) and good retention of capacitance (92% even after 10?000 cycles). This work demonstrated that both solid and liquid HTC fractions from this bio-waste can serve as effective sources to prepare functional carbon materials, making this approach a sustainable zero-waste biomass conversion process.
机译：麻烦的水草，风信子（Eichhornia crassipes）通过绿色节能的热液碳化（HTC）转化为固体和液体馏分。分别使用KOH和Fe〜（3+）离子通过简单的活化和磁化，将固体产物水炭作为前体来制备磁性碳材料。所获得的磁性吸附剂具有良好的磁性，并具有出色的吸附亚甲基蓝（524.20 mg g〜（？1）），甲基橙（425.15 mg g〜（？1））和四环素（294.24 mg g〜（？1））的能力。 ）即使在高浓度（高达500 mg L〜（？1））下也具有快速的吸附动力学，这归因于高比表面积和中孔孔隙率。除固体烃外，水溶性液体产品还用于通过简便的KOH活化来制备碳基超级电容器，与常规活化相比，该KOH的用量要低得多。由活化液体产品制成的超级电容器电极具有2545 cm〜（2）g〜（？1）的极高比表面积，并显示出优异的比电容（100 F g〜（？1）或50 F cm〜（？3） ）在1 A g〜（？1））和良好的电容保持率（即使在10 000次循环后仍达到92％）。这项工作表明，来自这种生物废物的固体和液体HTC馏分均可作为制备功能性碳材料的有效来源，使这种方法成为可持续的零废物生物质转化过程。

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