Environmental deoxyribonucleic acid(eDNA),which includes antibiotic resistance genes,is ubiquitous in the environment.The interactions between eDNA and biochar,a promising material widely used in soil amendment and water treatment,greatly affect the environmental behavior of eDNA.Hitherto few experimental evidences are available yet,especially on the information of thermodynamics and energy distribution to explains the interactions between biochar and eDNA.This study investigated the adsorption of herring sperm DNA(hsDNA)on pine sawdust biochar,with a specific emphasis on the adsorption thermodynamics and site energy distribution.The adsorption of hsDNA on biochar was enhanced by an increase in the pyrolysis and adsorption temperatures.The higher surface area,stronger n-n interaction,and weaker electrostatic repulsion between hsDNA and biochars prepared at high pyrolysis temperatures facilitated the adsorption of hsDNA.The thermodynamics indicated that the adsorption of hsDNA on biochar was spontaneous and endothermic.Therefore,higher temperature was beneficial for the adsorption of hsDNA on biochar;this was well explained by the increase in E*and F(E*)with the adsorption temperature.These results are useful for evaluating the migration and transformation of eDNA in the presence of biochar.

Mingyi Yang;Lin Shi;Di Zhang;Zhaohui He;Aiping Liang;Xiao Sun

Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;School of Resources and Environment,Linyi University,Linyi 276005,China;Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control,Kunming 650500,China;School of Environmental and Material Engineering,Yantai University,Yantai 264005,China

环境科学与工程前沿

[1]Mingyi Yang;Lin Shi;Di Zhang;Zhaohui He;Aiping Liang;Xiao Sun-.Adsorption of herring sperm DNA onto pine sawdust biochar:Thermodynamics and site energy distribution)[J].环境科学与工程前沿,2022(11):85-94

herring,sawdust,hsDNA

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