摘要
利用芦苇(Phragmites australis)、獐茅(Aeluropus littoralis)和互花米草(Spartina alterniflora)3种沿海滩涂植物在180、220、260℃条件下制备水热炭,通过光谱技术比较了不同水热温度条件下水热炭溶解性有机质(HDOM)及炭化液溶解性有机质(ADOM)含量和组分性质特征。结果表明:滩涂植物水热炭溶解性有机碳(DOC)含量为18.04~50.13 mg·g^(-1),炭化液DOC浓度为2.67~5.46 g·L^(-1),两者DOC含量均随水热温度上升而降低。HDOM和ADOM均含有2种类腐殖质物质(C1和C2)和2种类蛋白物质(C3和C4),HDOM和ADOM总类蛋白组分含量均随水热温度上升而增加,而总类腐殖质组分随水热温度上升而下降。除互花米草HDOM和ADOM外,其他滩涂植物HDOM和ADOM类蛋白物质占比更高。HDOM和ADOM自生源组分特征明显,生物可利用性高,腐殖化程度低。HDOM芳香性、疏水性和相对分子质量高于ADOM。此外,HDOM和ADOM相对分子质量均随着水热温度的上升而下降。3种植物ADOM的芳香性和疏水性均随水热温度上升而下降,但不同植物HDOM的芳香性和疏水性随水热温度上升出现不同变化特征。HDOM和ADOM主要官能团为羧基化合物C O、芳香族C C、—OH、多糖类C—O或醚类C—O—C,其受水热温度和植物原料的影响明显。本研究结论可为水热炭和炭化液农用时施用量确定、受纳水体水质管理和农田污染物迁移转化评估提供重要的理论支撑。
Hydrochars were prepared using coastal beach plants(Phragmites australis,Aeluropus littoralis,and Spartina alterniflora)at 180,220 and 260℃.Fractional properties and contents of dissolved organic matter derived from hydrochars(HDOM)and that from hydrothermal aqueous phases(ADOM)at various hydrothermal temperatures were compared through spectroscopic techniques.The results show that the dissolved organic carbon(DOC)contents of hydrochars ranged from 18.04 to 50.13 mg·g^(-1),and the DOC concentrations of hydrothermal aqueous phases ranged from 2.67 to 5.46 g·L^(-1),with both DOC contents decreased with the increase of hydrothermal temperatures.Both HDOM and ADOM contained two humic-like substances(C1 and C2)and two protein-like substances(C3 and C4),and the content of the total protein-like fractions of both HDOM and ADOM increased with increasing hydrothermal temperatures,whereas the total humic-like fractions showed the opposite trend.The protein-like proportions of HDOM and ADOM were generally higher than humic-like substances except in the case of Spartina alterniflora-derived HDOM and ADOM.The autochthonous source fractions of HDOM and ADOM were evident,and both exhibited characteristics of high bioavailability and low humification.HDOM was more aromatic,hydrophobic,and had a higher relative molecular weight compared to ADOM.In addition,the relative molecular weights of both HDOM and ADOM decreased with increasing hydrothermal temperatures.The aromaticity and hydrophobicity of ADOM decreased with the increase of hydrothermal temperatures,whereas the aromaticity and hydrophobicity of HDOM derived from various plants displayed diverse change patterns with the increase of hydrothermal temperatures.The primary functional groups of HDOM and ADOM included C O of carboxyl compounds,C C of aromatic,—OH,C—O of polysaccharides or C—O—C of ethers.These functional groups were significantly affected by hydrothermal temperatures and plant materials.This study provides crucial theoretical support for the determination of the application amounts of hydrochar and hydrothermal aqueous phases in agricultural application,water quality management of receiving water bodies,as well as for the assessments of environmental contaminants migration and transformation in farmland.
作者
陈丙法
郑京成
顾鑫才
冯慕华
刘宏
孔明
韩士群
CHEN Bing-fa;ZHENG Jing-cheng;GU Xin-cai;FENG Mu-hua;LIU Hong;KONG Ming;HAN Shi-qun(Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain,Ministry of Agriculture and Rural Affairs,Nanjing 210014,China;School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China;College of Wetlands,Yancheng Teachers University,Yancheng 224002,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2024年第11期1533-1545,共13页
Journal of Ecology and Rural Environment
基金
国家自然科学基金项目(42307090)
国家环境保护长江中下游水生态健康重点实验室开放课题(AEHKF2023008)
江苏省产学研合作项目(BY20230288)。
关键词
滩涂植物
水热炭
炭化液
溶解性有机质
光谱技术
coastal beach plant
hydrochar
hydrothermal aqueous phase
dissolved organic matter
spectroscopic techniques
