农业环境科学学报2025，Vol.44Issue(2)：499-508,10.DOI:10.11654/jaes.2024-0310
堆肥腐植酸吸附铵态氮和氨气的性能与机理
Adsorption performance and mechanism of compost humic substances on ammonium nitrogen and ammonia
摘要
Abstract
To explore the adsorption effect and mechanism of humic substances derived from compost on NH+4 and NH3,humic substances produced during aerobic fermentation of agricultural waste were extracted and purified to obtain humic acid(C-HA)and fulvic acid(C-FA),which were compared with commercial humic acid(B-HA)and commercial fulvic acid(B-FA)on the adsorption capacity of NH+4 and NH3.Elemental analysis,scanning electron microscopy,specific surface area(BET)and Fourier transform infrared spectroscopy(FTIR)measurements were used to characterize the physiochemical properties of humic acid and fulvic acid.Dynamic adsorption and isothermal adsorption tests were conducted to analyze the adsorption behavior of humic acid on NH+4 and NH3 and fulvic acid on NH3.The results showed that the specific surface area and total pore volume of B-HA and C-HA were small with underdeveloped pore structure.Contents of total acidic group and phenolic hydroxyl group of C-HA were 27.1%and 14.1%higher than those of B-HA.After adsorption of NH+4 or NH3,the peak intensity corresponding to hydroxyl group decreased remarkably.The maximum adsorption capacities of C-HA and B-HA for NH+4 were 5.347 mg·g-1 and 5.099 mg·g-1,respectively.The adsorption process conformed to the quasi second order kinetic equation and Langmuir isotherm adsorption model,suggesting that the adsorption process was monolayer adsorption and was controlled by chemical adsorption.The adsorption capacity of C-HA,B-HA,C-FA and B-FA for NH3were 38.98,23.17,57.07 mg·g-1,and 66.96 mg·g-1,respectively.The higher adsorption capacity of C-HA for NH+4 and NH3 than that of B-HA should be mainly related to the higher content of oxygen-containing acidic functional groups such as phenolic hydroxyl and carboxyl groups.In summary,compost humic substances has the potential to serve as an adsorption material for NH+4 and NH3.关键词
胡敏酸/富里酸/氨气/铵态氮/堆肥Key words
humic acid/fulvic acid/ammonia/ammonium/compost分类
农业科学引用本文复制引用
陈豹,曹云,孙恩惠,曲萍,徐跃定,黄红英,靳红梅..堆肥腐植酸吸附铵态氮和氨气的性能与机理[J].农业环境科学学报,2025,44(2):499-508,10.基金项目
国家自然科学基金项目(42077100) National Natural Science Foundation of China(42077100) （42077100）
