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| Adsorption performance and mechanism of compost humic substances on ammonium nitrogen and ammonia |
| Received:April 12, 2024 |
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| KeyWord:humic acid;fulvic acid;ammonia;ammonium;compost |
| Author Name | Affiliation | E-mail | | CHEN Bao | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environment, Nanjing Agricultural University, Nanjing 210095, China | | | CAO Yun | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environment, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | yun.cao@jaas.ac.cn | | SUN Enhui | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | QU Ping | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | XU Yueding | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | HUANG Hongying | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | JIN Hongmei | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | |
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| Abstract: |
| To explore the adsorption effect and mechanism of humic substances derived from compost on NH4+ and NH3, humic substances produced during aerobic fermentation of agricultural waste were extracted and purified to obtain humic acid（C-HA）and fulvic acid（CFA）, which were compared with commercial humic acid（B-HA）and commercial fulvic acid（B-FA）on the adsorption capacity of NH4+ 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 NH4+ 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 NH4+ or NH3, the peak intensity corresponding to hydroxyl group decreased remarkably. The maximum adsorption capacities of C-HA and B-HA for NH4+ 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 NH3 were 38.98, 23.17, 57.07 mg·g-1, and 66.96 mg·g-1, respectively. The higher adsorption capacity of C-HA for NH4+ 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 NH4+ and NH3. |
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