Details

Autor(en) / Beteiligte

• Kim, Hyunjung
• Kim, Juhee
• Kim, Minhee
• Hyun, Seunghun
• Moon, Deok Hyun

Titel

Sorption of sulfathiazole in the soil treated with giant Miscanthus-derived biochar: effect of biochar pyrolysis temperature, soil pH, and aging period

Ist Teil von

• Environmental science and pollution research international, 2018-09, Vol.25 (26), p.25681-25689

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• Agricultural soil was treated with biochar (5% w / w ) produced from two pyrolysis temperatures (400 and 700 °C) of giant Miscanthus (GMC-400 and GMC-700, respectively), and the subsequent sorption of sulfathiazole (STZ) was evaluated as a function of pH (2, 5, and 7) and aging period (0, 3, and 6 months). Because sorption was nonlinear, with 0.51 <  N  < 0.75, the linearized sorption coefficient ( K d * ) was used for the comparison across samples. The K d * of GMC-400 treatment (3.96–9.96 L kg −1 ) was higher than that of GMC-700 treatment (1.27–3.38 L kg −1 ). In laps of aging period over 6 months, the sorption of GMC-400-treated soil had gradually increased to be 3.3 times higher than that of untreated soil, whereas there was no statistical difference for GMC-700 treatment. Results of FTIR and SEM analyses revealed that the number of O-containing functional groups in the GMC-400 treatment increases and the micropores of GMC-700 are deformed over time. Sorption was also pH-dependent in the order of pH 2 > pH 5 > pH 7. The sorption hysteresis ( H ) index for the GMC-400 treatment was higher at pH 7 (3.99) than at pH 5(2.53), and both values had increased after 6 months (4.18 and 3.17, respectively). The results of this study clearly demonstrate that the sorption of STZ on GMC-treated soils is greatly enhanced, mainly through the greater micropore surfaces, the abundance of hydrophilic functional groups over time, and π + -π electron donor-acceptor interaction at low pH.