Citation: | YANG Yuzhen, GAO Baolong, HUANG Yi, XIAO Dechang, CHEN Fei, LUO Heng, LI Lifen, WU Gang. The adsorption characteristics of Pb2+ and Cd2+ by straw based biochars generated at medium-high pyrolysis temperatures[J]. GEOLOGY IN CHINA, 2023, 50(1): 52-60. DOI: 10.12029/gc20220509001 |
This paper is the result of environmental geological survey engineering.
Effect of pyrolysis temperature and raw materials on adsorption of heavy metals by straw-based biochar.
Corn straw and rice straw were used as raw materials to prepare straw based biochars (i.e. S450, S600, Y450, Y600) under anoxic conditions at 450℃ and 600℃. And the differences in their surface characteristics and their adsorption capacity for Pb2+ and Cd2+ in solutions were studied.
The results showed that the pyrolysis temperature had a significant effect on the physicochemical properties of different biochars. With the increase of pyrolysis temperature, the C contents of biochars increased, but N, H, O contents decreased. Besides, their specific surface area, total pore volume and average pore diameter all showed a decreased tendency. As the result of the increase of pyrolysis temperature, the adsorption capacity and rate of Pb2+ and Cd2+ increased. Meanwhile, the adsorption capacity of Pb2+ and Cd2+ of corn straw biochar was significantly higher than that of rice straw biochar. The adsorption of Pb2+ and Cd2+ by the four biochars was dominated by chemical precipitation.
The adsorption of Pb2+ and Cd2+ was mainly multilayer and monolayer adsorption, respectively. Straw based biochars with higher pyrolysis temperature had higher adsorption capacity for Pb2+ and Cd2+. This study is useful for straw resource utilization and heavy metal pollution remediation.
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