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Elemental mercury (Hg 0 ) removal from a hot gas is still challenging since high temperature influences the Hg 0 removal and regenerable performance of the sorbent. In this work, a facile yet innovative sonochemical method was developed to synthesize a thermally stable magnetic tea biochar to capture the Hg 0 from syngas. A sonochemically synthesized magnetic sorbent (TUF 0.46 ) exhibited a more prodigious surface area with developed pore structures, ultra-paramagnetic properties, and high dispersion of Fe 3 O 4 /γ-Fe 2 O 3 particles than a simply synthesized magnetic sorbent (TF 0.46 ). The results showed that TUF 0.46 demonstrated strong thermostability and attained a high Hg 0 removal performance (∼98.6%) at 200 °C. After the 10th adsorption/regeneration cycle, the Hg 0 removal efficiency of TUF 0.46 was 19% higher than that of TF 0.46 . Besides, at 23.1% Hg 0 breakthrough, TUF 0.46 achieved an average Hg 0 adsorption capacity of 16.58 mg/g within 24 h under complex syngas (20% CO, 20% H 2 , 5% H 2 O, and 400 ppm H 2 S). In addition, XPS results revealed that surface-active components (Fe + , O 2- , O*, C=O) were the key factor for high Hg 0 removal performance over TUF 0.46 from syngas. Hence, sonochemistry is a promising practical tool for improving the surface morphology, thermal resistance, renewability, and Hg 0 removal efficiency of a sorbent.

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg0) Removal, and Regenerable Performance of Magnetic Tea Biochar

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar