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Hg 0 Removal by Straw Biochars Prepared with Clean Microwave/H 2 O 2 Modification
Author(s) -
Cui Shuaibo,
Shan Ye,
Liu Yangxian
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202100009
Subject(s) - biochar , straw , adsorption , flue gas , chemistry , chemisorption , activated carbon , raw material , nuclear chemistry , surface modification , microwave , sorbent , pyrolysis , inorganic chemistry , organic chemistry , quantum mechanics , physics
Biochar is one of the most promising adsorbents for Hg 0 from flue gas due to renewable raw materials. Cotton straw and maize straw biochars prepared by microwave activation and H 2 O 2 modification were used for removing Hg 0 from flue gas. Hg 0 capture efficiency and mechanism on biochars were studied. Cotton straw and maize straw biochars modified with 2 and 10 % H 2 O 2 , respectively, show optimal Hg 0 removal performance exceeding that of activated carbon. Microwave activation and H 2 O 2 impregnation greatly improve the BET surface areas of the biochars. H 2 O 2 impregnation increases the number of O‐containing functional groups, i.e., O–H and C–O, on the biochar surface, enhancing Hg 0 removal. Chemisorption dominates the Hg 0 capture on biochars.