How can you identify biochar from FTIR?

Quick answer

biochar is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.

Peak interpretation

Possible materials / groups

Spectrum logic

The logic here is evidence aggregation: repeated literature mentions of biochar, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.

Real-world usage

This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.

Common mistakes

• Calling a material match too early because one famous peak is present.
• Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
• Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.

Verification advice

Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.

Literature behind this page

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  Study of biochar from pyrolysis and gasification of wood pellets in a nitrogen plasma reactor for design of biomass processes DOI: 10.1016/j.jece.2019.103391
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  Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis DOI: 10.1016/j.biortech.2017.07.017
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  Simultaneous immobilization of heavy metals in soil environment by pulp and paper derived nanoporous biochars DOI: 10.1007/s40201-018-0294-6
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  Preparation of Porous Biochar from Soapberry Pericarp at Severe Carbonization Conditions DOI: 10.3390/fermentation7040228
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  Dataset for effect of pH on caffeine and diclofenac adsorption from aqueous solution onto fique bagasse biochars DOI: 10.1016/j.dib.2019.104111
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  Khui 等 - 2020 - Synthesis and Characterization of Micro-nano Carbo DOI: 10.1016/j.biortech.2012.12.165
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  Efficient Low Temperature Hydrothermal Carbonization of Chinese Reed for Biochar with High Energy Density DOI: 10.3390/en10122094
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  Lu 等 - 2020 - Adsorption of Rhodamine B from Aqueous Solution by DOI: 10.15244/pjoes/112207
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  Influence of Pyrolysis Temperature on Physico-Chemical Properties of Corn Stover (Zea mays L.) Biochar and Feasibility for Carbon Capture and Energy Balance DOI: 10.1371/journal.pone.0156894
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  Palapa 等 - 2020 - CuAl LDHRice Husk Biochar Composite for Enhanced DOI: 10.9767/bcrec.15.2.7828.525-537)