| Title | Spent mushroom substrate is capable of physisorption-chemisorption of CO2 |
|---|---|
| ID_Doc | 13679 |
| Authors | Alves, LD; Moreira, BRD; Viana, RD; Dias, ES; Rinker, DL; Pardo-Gimenez, A; Zied, DC |
| Title | Spent mushroom substrate is capable of physisorption-chemisorption of CO2 |
| Year | 2022 |
| Published | |
| Abstract | No in-depth investigation exists on the feasibility of integrating hydrothermal carbonization (HTC) and pelletization into the process of making spent mushroom substrate (SMS), an agro-food residue from the commercial mushroom industry, into an adsorbent for post-combustion CO2 removal. Therefore, this study analyzed if it could be possible for systematically converting low-pressure hydrochars of various SMSs into carbon-adsorbing mini-capsules. Sources of SMS included paddy straw and achiote capsule shell from Pleurotus ostreatus; eucalyptus sawdust and grassy straw from Lentinula edodes; and compost containing peat or soil as casing layer from Agaricus subrufescens. The eucalyptus sawdust and grassy straw from L. edodes outperformed the other biomaterials in adsorbing CO2 , and thus effectively encapsuled most of the gas, 8.25 mmol g(-1) and 8.10 mmol g(-1) , respectively. They contained mostly hetero-atoms of O and N, requiring less unit energy to bind acidic molecules of CO2 at the alkaline sites. The amount of unit energy the pore-filling process demanded at 25 degrees C was 12.65 kJ mol(-1) , an attribute of self-sustaining and saleable physisorption. A negative 6.80 kJ mol(-1) free energy validated both spontaneity and exothermal of biocarbons at steady-state atmosphere. The major findings and innovations of our study support utilizing SMS as an adsorbent as a carbon capture, storage and utilization networking. Our insights into the physisorption-chemisorption on SMS are timely and relevant to help manage the re-use of SMS, and thus bring the global mushroom industry closer to environmental sustainability and toward a lower carbon society and circular economy. |
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