期刊
BIORESOURCE TECHNOLOGY
卷 270, 期 -, 页码 223-229出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.09.027
关键词
Hydrochar; Biomass valorisation; Carbon-/oxygen-centred radicals; Surface chemistry; Fenton-like reaction
资金
- National Natural Science Foundation of China [2090702921577085]
- Natural Science Fund Projects of Shanghai Municipal Science and Technology Commission [14ZR1415600]
- Innovative Project of Shanghai Municipal Education Commission [10YZ07]
- Key Subject of Shanghai Municipality [S30109]
In this study, lignin was selected as the main component of waste biomass to synthesise carbonaceous adsorbents with environmentally persistent free radicals (EPFRs) through hydrothermal carbonisation (HTC) under different conditions. The HTC method with Fe(III) doping was superior for promoting dehydration and decarboxylation of lignin hydrochar than that with HTC Cu(II) doping. The deconstruction of oxygen-containing groups of lignin was reduced while esterification was enhanced by Fe(III). The Fe(III) addition was conducive to the formation of EPFRs as carbon-centred radicals with an adjacent oxygen atom and oxygen-centred radicals. A comparison of lignin with cellulose and D-xylose suggests that the formed EPFRs on lignin hydrochar were derived from their phenolic hydroxyl groups. A high removal efficiency of bisphenol A by lignin hydrochar was observed owing to oxygen-centred radicals, which activated H2O2 to produce center dot OH. These results will facilitate the design and application of novel hydrochar materials with EPFRs.
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