In this study, biochar from black soy straw (BS), corn straw (CS), millet straw (MS), rice straw (RS), tobacco straw (TS), wheat straw (WS) were prepared at 600 oC in high purity nitrogen. The biochars were modified with 1%Cl2 (N2 as balance) plasma in dielectric barrier discharge reactor for 5 minutes at 23 W. The effects of modification on mercury removal performance of biochars were investigated in a fixed bed reactor. The results showed that the initial mercury removal efficiency of BS, CS, MS, RS, TS and WS were 2.2%, 3.8%, 1.6%, 8.2%, 8.2% and 1.5%, respectively, and the Hg0 adsorption capacity were 3.2, 0.9, 0.3, 7.3, 16.1 and 1.2 µg/g in 90 minutes, respectively. After Cl2 plasma modification, the initial mercury removal efficiency of BS-Cl2, CS-Cl2, MS-Cl2, RS-Cl2, TS-Cl2 and WS-Cl2 were 5.3%, 42.7%, 81.1%, 83.9%, 84.2% and 52.7% , respectively, and the Hg0 adsorption capacity also increased to 12.6, 150.8, 444.3, 445.1, 583.0 and 217.6 µg/g in 90 minutes, respectively. The results demonstrate that biochar modified with plasma is a potential adsorbent for Hg0 removal from flue gas.

Adsorptive removal of mercury by biochar modified with plasma

254th National Meeting (2017)

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