首页|Dissolved carbon in biochar:Exploring its chemistry,iron complexing capability,toxicity in natural redox environment
Dissolved carbon in biochar:Exploring its chemistry,iron complexing capability,toxicity in natural redox environment
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Dissolved carbon in biochar:Exploring its chemistry,iron complexing capability,toxicity in natural redox environment
Dissolved black carbon(DBC)plays a crucial role in the migration and bioavailability of iron in water.However,the properties of DBC releasing under diverse pyrolysis condi-tions and dissolving processes have not been systematically studied.Here,the composi-tions of DBC released from biochar through redox processes dominated by bacteria and light were thoroughly studied.It was found that the DBC released from straw biochar possess more oxygen-containing functional groups and aromatic substances.The content of phenolic and carboxylic groups in DBC was increased under influence of microorgan-isms and light,respectively.The concentration of phenolic hydroxyl groups increased from 10.0～57.5 mmol/gC to 6.6～65.2 mmol/gC,and the concentration of carboxyl groups in-creased from 49.7～97.5 mmol/gC to 62.1～113.3 mmol/gC.Then the impacts of DBC on pyrite dissolution and microalgae growth were also investigated.The complexing Fe3+was proved to play a predominant role in the dissolution of ferrous mineral in DBC solution.Due to complexing between iron ion and DBC,the amount of dissolved Fe in aquatic water may rise as a result of elevated number of aromatic components with oxygen containing groups and low molecular weight generated under light conditions.Fe-DBC complexations in solu-tion significantly promoted microalga growth,which might be attributed to the stimulating effect of dissolved Fe on the chlorophyll synthesis.The results of study will deepen our understanding of the behavior and ultimate destiny of DBC released into an iron-rich envi-ronment under redox conditions.
Dissolved black carbonBacteriaLightIron complexesToxicity
Chaochao Lai、Juhong Zhan、Qiuyun Chai、Changlu Wang、Xiaoxia Yang、Huan He、Bin Huang、Xuejun Pan
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Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China
Research Institute for Environmental Innovation(Suzhou)Tsinghua,Suzhou 215163,China
Dissolved black carbon Bacteria Light Iron complexes Toxicity
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