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Adsorption capacity of phenanthrene and pyrene to engineered carbon-based adsorbents produced from sewage sludge or sewage sludge-biomass mixture in various gaseous conditions
- Godlewska, Paulina, Siatecka, Anna, Kończak, Magdalena, Oleszczuk, Patryk
- Bioresource technology 2019 v.280 pp. 421-429
- adsorbents, adsorption, biochar, carbon dioxide, hydrophobic bonding, nitrogen, phenanthrenes, sewage, sewage sludge, temperature
- Adsorption of phenanthrene (PHE) and pyrene (PYR) by engineered carbon-based adsorbents produced from sewage sludge in an atmosphere of nitrogen (N₂) or carbon dioxide (CO₂) at temperatures of 500, 600, and 700 °C was investigated. The addition of willow to the SSL decreased the biochar adsorption capacity. However, there was an increase in the adsorption capacity after changing N₂ to CO₂. The addition of willow to SSL and the type of carrier gas affected the mechanism of adsorption. The adsorption of PHE and PYR on the SSL-derived adsorbents produced in N₂ occurred through pore filling. The adsorption on the SSL-derived adsorbents with willow followed the mechanism of π-π electron-donor-acceptor (EDA) interactions and hydrophobic interactions. A similar mechanism was observed with regard to the biochars produced from SSL in atmosphere of CO₂. For the SSL-derived adsorbents with willow in CO₂, the adsorption mechanism was observed to vary between PHE and PYR.