Publications by authors named "Siyao Bian"
Article Synopsis
- Iron-doping is a common method to enhance the ability of biochar to adsorb contaminants like tetracycline, but traditional methods often require high temperatures and lead to iron clumping.
- Researchers developed an innovative low-temperature process (200 °C) to create an effective biochar that maintains iron oxides and hydroxides in a well-dispersed form, along with abundant oxygen and nitrogen functional groups on its surface.
- This iron-doped biochar demonstrated an impressive adsorption capacity of 891.37 mg/g at pH 5 and can be recycled effectively, showcasing its potential for environmental applications.
Fenton modification, involving iron-promoted pyrolysis followed by HO oxidation, was first employed to improve the adsorptive and magnetic capabilities of biochar. Modified biochars were prepared from rubber tree bark and coconut shell through iron-promoted pyrolysis and subsequent HO oxidation, and their adsorption behaviors toward Cr (VI) and MB were evaluated in aqueous solution. The modified biochars pyrolyzed at 300 and 400 ˚C displayed much higher adsorption capabilities than corresponding pristine biochars for Cr (VI) and MB, respectively, ascribing to introduction of COOH, CO and C-O groups by Fenton oxidation.
View Article and Find Full Text PDFCatalytic oxidative pyrolysis is a promising method for the preparation of highly adsorptive biochar by introducing oxygen-containing groups. Here, a KFeO-catalyzed oxidative pyrolysis was described for enhancing the adsorption capability of areca leaf biochar toward methylene blue at low temperature. It was shown that the maximum adsorption capacity of the biochar pyrolyzed at 200 °C was greatly improved from 122.
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