Removal and recovery of gas-phase element mercury by metal oxide-loaded activated carbon.
The reusability of Co(3)O(4) (AC-Co), MnO(2) (AC-Mn) and CuCoO(4) (AC-CC) loaded activated carbon (AC) and their element mercury removal efficiency had been studied using a laboratory-scale fixed-bed reactor under simulated flue gas conditions. Tests showed that spent AC-Co could be regenerated through heating at 673 K under N(2) atmosphere and the enrichment regenerated Hg(0) could be collected to eliminate the secondary pollution. Regenerated AC-Mn and AC-CC's Hg(0) removal efficiency decreased greatly due to AC's decomposition and MnO(2)'s crystal structure variation. Compared with AC and metal oxides, metal oxide-loaded AC had higher Hg(0) capture ability and capacity due to AC huge surface areas and lots of function groups. TGA analysis results showed that AC-Co and AC-Mn's HgO adsorptive capacity at 523 K reached 19.8 mg g(-1) and 5.21 mg g(-1), respectively. High loading values and adsorption temperatures were beneficial to AC-Co's Hg(0) removal efficiency. However, CuCoO(4) and MnO(2)'s AC decomposition ability had negative effect on AC-CC and AC-Mn's performance, respectively, especially at high adsorption temperatures and loading values. SO(2) tests showed that AC-CC had higher anti SO(2)-poisoning ability than AC-Co and AC-Mn.
Mei
Zhijian
Z
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China.
Shen
Zhemin
Z
Zhao
Qingjie
Q
Wang
Wenhua
W
Zhang
Yejian
Y
D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification*; D002606:Charcoal; D003031:Coal; D005740:Gases / Q000302:isolation & purification*; D017745:Incineration; D008628:Mercury / Q000302:isolation & purification*; D011210:Power Plants
D000393:Air Pollutants; D003031:Coal; D005740:Gases; D002606:Charcoal; D008628:Mercury