Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K(2)CO(3)-activated magnetic biochar.
Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K(2)CO(3)-activated magnetic biochar.
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溶解腐植酸和包覆腐植酸对 K2CO3 活化磁性生物炭吸附四环素的影响
DOI：
10.1038/s41598-022-22830-9
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发表时间：
2022-11-08
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
作者：
Humic acids (HAs) widely exist in water environment, and has an important impact on the adsorption of pollutants. Herein, HAs (both dissolved and coated) was employed to assess the effect on the removal of the organic contaminant tetracycline (TC) by K2CO3 modified magnetic biochar (KMBC). Results showed that low concentration of dissolved HAs promoted TC removal, likely due to a bridging effect, while higher concentration of dissolved HAs inhibited TC adsorption because of the competition of adsorption sites on KMBC. By characterization analysis, coated HAs changed the surface and pore characteristics of KMBC, which suppressed the TC removal. In a sequential adsorption experiment involving dissolved HAs and TC, the addition of HAs at the end of the experiment led to the formation of HAs-TC ligands with free TC, which improved the adsorption capacity of TC. TC adsorption by KMBC in the presence of dissolved HAs and coated HAs showed a downward trend with increasing pH from 5.0 to 10.0. The TC adsorption process was favorable and endothermic, and could be better simulated by pseudo-second-order kinetics and Freundlich isotherm model. Hydrogen bonds and π–π interactions were hypothesized to be the underlying influencing mechanisms.
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