Green and sustainable zero-waste conversion of water hyacinth (: Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes

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 Fe³⁺ 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 cm² 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 10000 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.