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Predicting the effect of dissolved humic acid on sorption of benzotriazole to biochar

Biochar 2022年第1期4卷 959-971页

作者： Lin Wu Xiaoli Zhao Erping Bi School of Water Resources and Environment Beijing Key Laboratory of Water Resources and Environmental Engineeringand MOE Key Laboratory of Groundwater Circulation and Environmental EvolutionChina University of Geosciences(Beijing)Beijing 100083China China Geological Survey(CGS)&Hebei Province Key Laboratory of Groundwater Contamination and Remediation Institute of Hydrogeology and Environmental GeologyChinese Academy of Geological SciencesShijiazhuang 050061China

Dissolved organic matter plays a critical role in affecting sorption properties of biochar for organic *** this study,dissolved humic acid(DHA)as a representative of dissolved organic matter and oak sawdust-derived biochar as a sorbent were prepared and *** of DHA in sorption of benzotriazole(BTA),an emerging organic contaminant,to biochar in different electrolyte solutions were *** results revealed the dual roles of DHA in BTA sorption to *** the one hand,DHA can compete for sites and/or block pores available for BTA to inhibit the adsorption of BTA to *** the other hand,the sorbed DHA on biochar can serve as additional partitioning phase to promote the partition of *** finding was in accordance with the site energy distribution analysis of BTA sorption that the site energy of the highest occurring frequency in the DHA-BTA system was lower than that in the DHA-free system(3.41-10.4 versus 13.1-20.1 kJ mol^(−1)).The variation in apparent BTA sorption to biochar affected by DHA was thus a combination of changes in both its partition and adsorption properties.A modified Dual-mode model including the aqueous concentration of DHA was proposed to predict the effect of DHA on BTA sorption to biochar in different electrolyte solutions,which showed good prediction performance with most BTA sorption coefficient(K_(d),L g^(−1))deviations within 0.1 log unit.

关键词： Emerging organic contaminant Black carbon Dissolved organic matter Sorption site energy distribution

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