Removal of elemental mercury by modified bamboo carbon

The mercury removal performance of modified bamboo charcoal (BC) was investigated with a bench-scale fixed-bed reactor. A simple impregnation method was used to modify the BC with ZnCl2 and FeCl3 separately. BET and XPS were used to determine the pore structure and surface chemistry of the sorbents. The role of Fe3 + in the removal of elemental mercury by modified sorbents was discussed. The experimental results suggest that the modified BCs have excellent adsorption potential for elemental mercury at a relatively higher temperature, 140 °C. The BET surface area and average pore size of modified sorbents do not show noticeable priority compared to unmodified BC. XPS spectra indicate that Fe atoms mainly exist in the form of Fe3 + for the FeCl3-impregnated BC. Better performance of FeCl3-impregnated BC at different temperatures (20, 140 and 180 °C) suggests the enhancement of non-chloride functional groups (Fe3 +). Inhibition effect of SOx and NO for Hg0 removal by BC samples is present in the study.

Bamboo is an outstanding renewable biomass resource due to its fast growth speed. Bamboo and its residues can be transformed into bamboo charcoal (BC) in high temperature and low oxygen atmosphere. BC is an environmentally friendly sorbent and can be cost-effective for removing gaseous mercury. To enhance the mercury removal performance of BC, a simple and reliable impregnation method is used to modify BC materials with ZnCl2 and FeCl3. The modified BC has excellent capacity for elemental mercury removal from 20 °C to 180 °C. The performance of FeCl3-impregnated BC is better than that of ZnCl2-impregnated BC, suggesting the enhancement of non-chloride functional groups (Fe3 +).Figure optionsDownload as PowerPoint slide