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

被引:18
作者
Altaf, Adnan Raza [3 ]
Teng, Haipeng [3 ]
Gang, Liu [1 ]
Adewuyi, Yusuf G. [2 ]
Zheng, Maosheng [3 ]
机构
[1] China Huaneng Grp, State Key Lab Clean Coal Based Energy, Clean Energy Res Inst Co Ltd, Beijing 102209, Peoples R China
[2] North Carolina Agr & Tech State Univ, Chem Biol & Bio Engn Dept, Greensboro, NC 27411 USA
[3] Northwest Univ, Sch Chem Engn, Xian 710069, Peoples R China
关键词
ULTRASOUND-ASSISTED PREPARATION; FIRED POWER-PLANTS; POLYVINYL-CHLORIDE; CO-PYROLYSIS; FLUE-GAS; ADSORPTION; EMISSION; SORBENT; TRANSFORMATION; MECHANISMS;
D O I
10.1021/acsomega.1c02925
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 (TUF0.46) exhibited a more prodigious surface area with developed pore structures, ultra-paramagnetic properties, and high dispersion of Fe3O4/gamma-Fe2O3 particles than a simply synthesized magnetic sorbent (TF0.46). The results showed that TUF0.46 demonstrated strong thermostability and attained a high Hg-0 removal performance (similar to 98.6%) at 200 degrees C. After the 10th adsorption/regeneration cycle, the Hg-0 removal efficiency of TUF0.46 was 19% higher than that of TF0.46. Besides, at 23.1% Hg-0 breakthrough, TUF0.46 achieved an average Hg-0 adsorption capacity of 16.58 mg/g within 24 h under complex syngas (20% CO, 20% H-2, 5% H2O, and 400 ppm H2S). In addition, XPS results revealed that surface-active components (Fe+, O2-, O*, C = O) were the key factor for high Hg-0 removal performance over TUF0.46 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.
引用
收藏
页码:23913 / 23923
页数:11
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