Akademik Veri Yönetim Sistemi
3rd Bioenergy Studies Symposium, Samsun, Türkiye, 20 Mayıs 2021, ss.54
The main objective of this study is to determine the effectiveness of various activation methods
on the characteristics on biochar characteristics. The feedstock for producing biochar was used
raw tea waste (RTW) that is extensively produced in Turkey, a cheap and sustainable source.
The biochar was physically modified by low-frequency ultrasound (US) waves, chemically
treated with phosphoric acid (H3PO4), and functionalized by potassium hydroxide (KOH).
Biochar with high surface area and microporous structure was obtained by pyrolysis at 500 oC
with the treatment of H3PO4. On the other hand, treatment with KOH led to the formation of
meso- and macroporous structures along with the remaining functional groups on the surface.
Before chemical activation, US treatment increased the surface area and permeability of
samples by the formation of open pores. However, the duration of US treatment is critical.
Namely, above 60 min US treatment, the pore walls of biochar become thinner and breakage
occurs, resulting in decreasing surface area and pore volume. The biochar samples with
different characteristics have great use potential in many areas such as catalyst, adsorption,
energy storage.