溶磷微生物改性生物炭吸附重金属的机理研究

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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 (R_max²=0.99) was the main adsorption pathway of modified RB, while chemical precipitation (R_max²=0.99) was the main adsorption pathway after modified SB.

Key words： biochar phosphate solubilizing bacteria structural equation model microbial modification time heavy metal stress

Received: 01 July 2020

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X505

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	CHEN Hao-ming
	HU Yi-shu
	LI Zhen

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CHEN Hao-ming,HU Yi-shu,LI Zhen. Adsorption mechanism of heavy metals by phosphate-solubilizing microorganism modified biochar.[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 684-692.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/684

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