Adsorption mechanism of heavy metals by phosphate-solubilizing microorganism modified biochar.
CHEN Hao-ming1,2,3, HU Yi-shu1, LI Zhen1
1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China; 2. Nanjing University of Science and Technology, Nanjing 210094, China; 3. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China
Abstract:Rice husk (RB) and sludge (SB) biochars were modified by phosphorus-solubilizing bacteria (PSB) with different times. The materials were added to 1000mg/L Pb2+ and Cd2+ aqueous solution. The physicochemical properties and heavy metal content of the modified biochar were measured. Structural equation model was then applied to study the adsorption mechanism of heavy metals by modified biochar. Microbial modification significantly improved the pore size, specific surface area (BET) (12.5%~175.0%), and functional groups of biochar. In particular, the release of C and P from the biochars was significantly increased, which promoted the mineralization of heavy metals on the biochars. The adsorption of Pb2+ and Cd2+ by the two biochars was evidently improved after modification of PSB (RB increased:Pb2+=9.5%~34.5% and Cd2+=34.7%~219.9%, SB increased:Pb2+=65.3%~101.3% and Cd2+=106.6%~248.6%). In addition, the different stress of Pb and Cd lead to the distinct reaction pathway of heavy metal adsorption on the modified biochar. Moreover, the structural equation model results showed that 6~12h incubation had the best effect on PSB modifications. Meanwhile, the BET surface area was not the primary factor. Furthermore, there is also evident contrast regarding the mechanism of remediation by the different biochars. Therefore, this study proposes that the pore structure (Rmax2=0.99) was the main adsorption pathway of modified RB, while chemical precipitation (Rmax2=0.99) was the main adsorption pathway after modified SB.
陈颢明, 胡亦舒, 李真. 溶磷微生物改性生物炭吸附重金属的机理研究[J]. 中国环境科学, 2021, 41(2): 684-692.
CHEN Hao-ming, HU Yi-shu, LI Zhen. Adsorption mechanism of heavy metals by phosphate-solubilizing microorganism modified biochar.. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 684-692.
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