| 多种材料对水中氨氮的吸附特性 |
| 摘要点击 1458 全文点击 532 投稿时间：2018-11-26 修订日期：2019-02-23 |
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| 中文关键词 材料 氨氮 吸附 黑臭水体 修复 |
| 英文关键词 adsorption materials ammonia nitrogen adsorption polluted water body remediation |
| 作者 | 单位 | E-mail | | 焦巨龙 | 南昌航空大学环境与化学工程学院, 南昌 330063
中国环境科学研究院湖泊水污染治理与生态修复技术国家重点实验室, 北京 100012
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | jjl1034441586@163.com | | 杨苏文 | 中国环境科学研究院湖泊水污染治理与生态修复技术国家重点实验室, 北京 100012
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | yangsw@craes.org.cn | | 谢宇 | 南昌航空大学环境与化学工程学院, 南昌 330063 | | | 金位栋 | 中国环境科学研究院湖泊水污染治理与生态修复技术国家重点实验室, 北京 100012
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | | | 闫玉红 | 中国环境科学研究院湖泊水污染治理与生态修复技术国家重点实验室, 北京 100012
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | | | 徐彬 | 中国环境科学研究院湖泊水污染治理与生态修复技术国家重点实验室, 北京 100012
中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | |
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| 中文摘要 |
| 针对黑臭水体中氨氮难以去除的问题，选取沸石、麦饭石、硅藻土、膨润土和活性炭这5种材料，通过实验考察所选材料对水中氨氮的吸附性能.结果表明，准二级动力学方程更加适用于5种材料的数据拟合，得出最大吸附量分别为2.0673、0.9982、0.7580、1.7486和1.0160 mg·g-1，且接近实验值，因此化学吸附是主要的吸附方式；采用Langmuir和Freundlich等温方程对数据进行拟合，得出硅藻土更适合Langmuir等温方程，属于单层吸附，其他4种材料则更加适合Freundlich等温方程为多层分子吸附，且5种材料的吸附都为有利吸附；通过投加量实验得知，沸石、硅藻土、膨润土和活性炭对氨氮去除率随投加量增加而升高，最大去除率分别为100%、10.46%、49.25%和16.87%，而麦饭石先升高后降低，投加量为0.4g时，取得最大值为48.85%；在pH为4~10，沸石和麦饭石吸附量先增加后减少，而硅藻土、膨润土和活性炭的吸附量缓慢升高； 5种材料氨氮解吸量随初始浓度升高而升高. |
| 英文摘要 |
| Focusing on the removal of ammonia nitrogen from polluted water, the absorption properties of five materials (zeolite, maifanite, diatomite, bentonite, and activated carbon) were tested. Results showed that the pseudo-second-order kinetic equation was suitable for data fitting for the five materials. The maximum theoretical adsorption capacities of the five materials were 2.0673 mg·g-1, 0.9982 mg·g-1, 0.7580 mg·g-1, 1.7486 mg·g-1, and 1.0160 mg·g-1, respectively, which were close to the experimental value. Chemical-based adsorption was the main mode of adsorption. Data for diatomite were fitted using the Langmuir isotherm equation, and belonged to the single-layer molecular adsorption group, while the other four materials were fitted using the Freundlich isotherm equation, belonging to the multi-layer molecular adsorption group. Moreover, the results showed that the removal rates of ammonia nitrogen by zeolite, diatomite, bentonite, and activated carbon increased with an increase in dosage, and the maximum removal rates were 100%, 10.46%, 49.25%, and 16.87%, respectively. A maifanite dosage of 0.4g achieved the maximum removal rate of 48.85%. At pH 4-10, the adsorption capacities of zeolite and maifanite first increased and then decreased, while that of diatomite, bentonite, and activated carbon slowly increased. The desorption capacity of the five tested materials increased with an increase in the initial concentration of ammonia nitrogen. |
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