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Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes
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Document Title
Green and sustainable zero-waste conversion of water hyacinth (Eichhornia crassipes) into superior magnetic carbon composite adsorbents and supercapacitor electrodes
Author
Saning A, Herou S, Dechtrirat D, Ieosakulrat C, Pakawatpanurut P, Kaowphong S, Thanachayanont C, Titirici MM, Chuenchom L
Name from Authors Collection
Affiliations
Prince of Songkla University; Prince of Songkla University; Imperial College London; Kasetsart University; Mahidol University; Mahidol University; Chiang Mai University; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC); University of London; Queen Mary University London
Type
Article
Source Title
RSC ADVANCES
Year
2019
Volume
9
Issue
42
Page
24248-24258
Open Access
gold, Green Published
Publisher
ROYAL SOC CHEMISTRY
DOI
10.1039/c9ra03873f
Format
Abstract
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 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.
Funding Sponsor
Thailand Research Fund (TRF) [RDG62W0001]; Newton Fund under Newton Fund - Thailand Research Fund Institutional Links 2018/19 program (British Council) [413673062]; Science Achievement Scholarship of Thailand (SAST); Center of Excellence for Innovation in Chemistry, (PERCH-CIC); Center of Excellence in Nanotechnology for Energy (CENE) at Prince of Songkla University; EPSRC [EP/R021554/2] Funding Source: UKRI
License
CC BY-NC
Rights
Publisher
Publication Source
WOS