Factors controlling the formation of persistent free radicals in hydrochar during hydrothermal conversion of rice straw

Factors controlling the formation of persistent free radicals in hydrochar during hydrothermal... In the environment, persistent free radicals (PFR) have adverse effects on human health. PFR are generated by thermal conversion of biomass, such as hydrothermal carbonization to produce hydrochar. So far, the mechanism and control factors of PFR production in hydrochar are poorly known. Therefore, we investigated here the impacts of hydrothermal tempera- ture, residence time and solid load on the formation of PFR in hydrochar from hydrothermal carbonization of rice straw, by electron paramagnetic resonance (EPR) coupled with Fourier transform infrared spectrometers. Results show that the EPR signal intensity increased with increasing hydrothermal temperature from 180 to 240 °C and then decreased at 260 °C. A shorter residence time and a higher solid load led to formation of more PFR in hydrochar. The types of PFR also depended on hydrothermal temperature, residence time and solid load. This is the first report on the formation of PFR and relevant influencing factors during hydrothermal conversion of biomass. Based on these results, hydrochar from hydrothermal con - version of biomass at relatively higher temperature, i.e., 260 °C, longer residence time, i.e., 4 h, and lower solid load, i.e., 1:10, is suggested for safer application. Keywords Persistent free radicals · Hydrochar · Hydrothermal conversion · Hydrothermal temperature · Residence time · Solid load http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Chemistry Letters Springer Journals

Factors controlling the formation of persistent free radicals in hydrochar during hydrothermal conversion of rice straw

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Publisher
Springer International Publishing
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Environment; Environmental Chemistry; Ecotoxicology; Pollution, general; Analytical Chemistry; Geochemistry
ISSN
1610-3653
eISSN
1610-3661
D.O.I.
10.1007/s10311-018-0757-0
Publisher site
See Article on Publisher Site

Abstract

In the environment, persistent free radicals (PFR) have adverse effects on human health. PFR are generated by thermal conversion of biomass, such as hydrothermal carbonization to produce hydrochar. So far, the mechanism and control factors of PFR production in hydrochar are poorly known. Therefore, we investigated here the impacts of hydrothermal tempera- ture, residence time and solid load on the formation of PFR in hydrochar from hydrothermal carbonization of rice straw, by electron paramagnetic resonance (EPR) coupled with Fourier transform infrared spectrometers. Results show that the EPR signal intensity increased with increasing hydrothermal temperature from 180 to 240 °C and then decreased at 260 °C. A shorter residence time and a higher solid load led to formation of more PFR in hydrochar. The types of PFR also depended on hydrothermal temperature, residence time and solid load. This is the first report on the formation of PFR and relevant influencing factors during hydrothermal conversion of biomass. Based on these results, hydrochar from hydrothermal con - version of biomass at relatively higher temperature, i.e., 260 °C, longer residence time, i.e., 4 h, and lower solid load, i.e., 1:10, is suggested for safer application. Keywords Persistent free radicals · Hydrochar · Hydrothermal conversion · Hydrothermal temperature · Residence time · Solid load

Journal

Environmental Chemistry LettersSpringer Journals

Published: May 31, 2018

References

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