农业机械学报2024，Vol.55Issue(5)：386-394,9.DOI:10.6041/j.issn.1000-1298.2024.05.037
果菜秸秆生物炭吸附设施土壤硝态氮性能与机制研究
Adsorption of Nitrate Nitrogen by Solanaceous Vegetables Straw-derived Biochar
摘要
Abstract
Nitrogen fertilizer was excessively applied in the agricultural production,which resulted in soil secondary salinization and deterioration.Biochar has been gradually applied in soil restoration due to adsorption capacity.However,solanaceous vegetables straw-derived biochar was rarely reported.The present study aimed to explore the effect of solanaceous vegetables straw-derived biochar on adsorption of nitrate nitrogen and mitigation of soil secondary salinization.Straws of sweet pepper,tomato and eggplant were prepared as biochar by pyrolysis.Adsorption and mechanism for nitrate nitrogen removal by experimental solanaceous vegetables straw biochar was examined.Surface morphology and functional groups were characterized by scanning electron microscopy(SEM)and Fourier transform near-infrared spectroscopy(FTIR).The adsorption process of nitrate nitrogen was simulated and fitted by kinetic model and isothermal adsorption model.The adsorption mechanism of biochar was analyzed according to morphology and model parameters.All of the experimental solanaceous vegetables straw-derived biochar showed adsorption capacity of nitrate nitrogen.The maximum adsorption capacity of eggplant,tomato and sweet pepper straw-derived biochar were 114.788 mg/g,29.736 mg/g and 9.759 mg/g,respectively.The adsorption processes of eggplant and sweet pepper straw biochar were well fitted by quasi-second-order kinetic model,which was controlled by the integrated adsorption of chemical bond,micro-porefilling and internal diffusion.The adsorption process of tomato straw biochar was well fitted by the quasi-first-order kinetic model,which was mainly physical adsorption.Functional groups such as hydroxyl group,methyl group,methylene,carboxyl group and carbonyl group were observed in experimental biochar,according to FTIR analysis.Additionally,ether bonds were observed in eggplant and sweet pepper straw biochar and alcohol hydroxyl groups were observed in tomato straw biochar.Therefore,adsorption capacity of nitrate nitrogen was observed in the experimental solanaceous vegetables straw biochar.The eggplant straw biochar had the greatest adsorption capacity of nitrate nitrogen,which was affected by various physicochemical mechanisms such as pore filling,functional groups and complexation.The results demonstrated that eggplant straw biochar had great potential in amendments of secondary salinization soil.The present study provided insight into the effective utilization of solanaceous vegetables straw and soil remediation in crop production.关键词
果菜秸秆/生物炭/硝态氮/动力学/等温吸附模型/设施土壤/次生盐渍化Key words
solanaceous vegetables straw/biochar/nitrate nitrogen/kinetics/isothermal adsorption models/greenhouse soil/soil secondary salinization分类
农业工程引用本文复制引用
杨慧华,刘红叶,张晗,王仕娟,翟合生,魏珉,张大龙..果菜秸秆生物炭吸附设施土壤硝态氮性能与机制研究[J].农业机械学报,2024,55(5):386-394,9.基金项目
山东省重点研发计划项目(2023TZXD026)、山东省农业重大技术协同推广计划项目(SDNYXTTG-2023-04)和宁夏回族自治区重点研发计划项目(2023BCF01042) （2023TZXD026）
