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Extended Abstract Peatmoss derived biochars were produced at the pyrolytic temperatures of 300, 500, and 700 °C and were tested for the effectiveness of VOCs removal in waters. As the pyrolytic temperature increases, the carbon content were increased from 66% to 84% and hydrogen and oxygen contents were decreased from 4% to 1% and 19% to 4%, respectively. The surface areas of the biochars were 2 m 2 /g at the pyrolysis temperature of 300 °C, and were increased to 200 and 300 m 2 /g at 500 and 700 °C. FT-IR analysis showed that functional groups such as hydroxyl, nitro, and carboxyl groups were present at biochar produced at 300 °C, however, the functional groups were removed in the biochars produced at higher temperatures. Sorption kinetics and equilibrium experiments were conducted with 6 selected VOCs, such as benzene (BZN), toluene (TOL), ethylbenzene (EBZ), p-xylene (pXYL), trichloroethylene (TCE), and tetrachloroethylene (PCE), which are the most common VOCs found in contaminated groundwater of South Korea. Sorption equilibrium was attained within 6 hrs with first order kinetic rate constants of 0.5 hr -1 for the VOCs tested. Biochar produced at 500 °C showed the highest sorption capacity for all VOCs, although biochars produced at 300 and 700 °C showed similar sorption capacity. The biochars produced at 500 °C were tested on actual TCE contaminated groundwater and showed an excellent removal efficiencies both in batch and column experiments.

Peatmoss Derived Biochar as an Effective Sorbent for Removing VOCs in Groundwaters