The mechanisms and consequences of inorganic reactions during the production of ferrous sulphate enriched bamboo biochars

Ben Pace*, Paul Munroe, Christopher E. Marjo, Paul Thomas, Bin Gong, Jessica Shepherd, Wolfram Buss, Stephen Joseph

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Magnetic biochars are implicated in graphene micro-crystallite formation, soil redox processes and highly adsorbent chars. This study investigates the mechanisms of bamboo charring – when impregnated with FeSO4·7H2O – at 250, 350, 450 and 550 °C, using thermal and static techniques. Impregnation resulted in the oxidation of Fe2+ to mixed Fe3+/Fe2+ (magnetite) oxide forms during pyrolysis. A reaction sequence was proposed in which Fe-sulphates were incorporated with an ammonia catalyst. Sulphur became ubiquitous in both inorganic and organic forms, and additional minerals also formed. Stable aromatics and separation of holo-cellulosic and degraded lignin volatilisation phases were catalysed, and carboxylation was inhibited. Concentrations of C fluctuated more substantially, before stabilising at high HTTs. Pyrolysis temperatures of 450 °C and above appear to maximise stable C concentrations.These observations indicated that this treatment may yield agriculturally engineered chars with enhanced redox potential, more neutral pH, and a range of nutrients.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalJournal of Analytical and Applied Pyrolysis
Volume131
DOIs
Publication statusPublished - May 2018
Externally publishedYes

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