| 氢氧化镧掺杂氧化铝去除水体磷酸盐性能研究 |
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| 引用本文： | 刘涛,居小秋,郑寿荣. 氢氧化镧掺杂氧化铝去除水体磷酸盐性能研究[J]. 环境科学研究, 2022, 35(4): 1016-1024. DOI: 10.13198/j.issn.1001-6929.2021.12.25 |
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| 作者姓名： | 刘涛 居小秋 郑寿荣 |
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| 作者单位： | 1.南京工程学院环境工程学院，江苏 南京 211167 |
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| 基金项目： | 污染控制与资源化研究国家重点实验室开放基金(No.PCRRF20014)； |
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| 摘 要： | 为有效去除水体中的磷酸盐，采用沉淀沉积方法合成了氢氧化镧〔La(OH)3〕掺杂氧化铝(Al2O3)的吸附材料La(OH)3(X)/Al2O3〔X表示吸附剂中的La(OH)3质量含量〕，并对其吸附磷酸盐的性能进行研究. 结果表明:①Al2O3和La(OH)3是吸附剂中磷酸盐的主要结合位点. ②磷酸盐初始浓度为50 mg/L时，La(OH)3(19)/Al2O3吸附剂在初始阶段吸附较快，且在200 min左右达到吸附平衡. La(OH)3(X)/Al2O3吸附剂对磷酸盐的吸附量随着La(OH)3负载量的提高而升高，其吸附等温线符合Langmuir模型拟合. La(OH)3(7)/Al2O3、La(OH)3(13)/Al2O3、La(OH)3(19)/Al2O3和La(OH)3(27)/Al2O3对磷酸盐的最大吸附量可分别达到25.32、27.40、43.10和53.76 mg/g (以P计). 这表明La(OH)3掺杂Al2O3后为磷酸盐提供更多的活性位点，有效提高了磷酸盐的吸附容量. ③La(OH)3(19)/Al2O3对磷酸盐的吸附量随pH的升高而降低，共存阴离子影响试验表明，La(OH)3(19)/Al2O3对磷酸盐具有较高的吸附选择性. ④经过5次吸附-脱附循环后，La(OH)3(19)/Al2O3表现出稳定的吸附和再生性能，对实际水体磷酸盐的去除试验结果表明其可用于实际水体中磷酸盐的去除. 研究显示，La(OH)3(19)/Al2O3的磷酸盐吸附速率快、吸附容量高、吸附选择性高，具有潜在的应用价值.
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| 关 键 词： | 氧化铝 氢氧化镧 磷酸盐 吸附 |
| 收稿时间： | 2021-09-23 |
Phosphate Adsorption by Aluminum Oxide Doped with Lanthanum Hydroxide |
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| LIU Tao,JU Xiaoqiu,ZHENG Shourong. Phosphate Adsorption by Aluminum Oxide Doped with Lanthanum Hydroxide[J]. Research of Environmental Sciences, 2022, 35(4): 1016-1024. DOI: 10.13198/j.issn.1001-6929.2021.12.25 |
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| Authors: | LIU Tao JU Xiaoqiu ZHENG Shourong |
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| Affiliation: | 1.School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China2.State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China |
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| Abstract: | La(OH)3-doped Al2O3 adsorbents (i.e., La(OH)3(X)/Al2O3) were fabricated by coprecipitation method to effectively remove phosphate from water. The experimental results suggested that: (1) Lanthanum hydroxide and aluminum oxide were the active sites responsible for phosphate adsorption. (2) Very fast adsorption was found at the initial adsorption stage, and the adsorption equilibrium was reached within 200 min with an initial phosphate concentration of 50 mg/L. The adsorption isotherm suggested that La(OH)3 loading led to substantially enhanced phosphate adsorption and the adsorption isotherms of La(OH)3(X)/Al2O3 followed the Langmuir model. The maximum phosphate adsorption capacities of La(OH)3(7)/Al2O3, La(OH)3(13)/Al2O3, La(OH)3(19)/Al2O3 and La(OH)3(27)/Al2O3 were calculated to be 25.32, 27.40, 43.10 and 53.76 mg/g (calculated by P), respectively. The results indicated that doped La(OH)3 could provide more active sites for phosphate. (3) The adsorption capacity of La(OH)3(19)/Al2O3 decreased with increasing pH. Additionally, La(OH)3(19)/Al2O3 had higher adsorption selectivity for phosphate than coexisting Cl?, NO3? and SO42?. (4) The adsorption-desorption experiments showed that La(OH)3(19)/Al2O3 exhibited a stable performance after 5 adsorption-desorption cycles. Furthermore, the experimental results showed that La(OH)3(19)/Al2O3 could be used for phosphate removal from the actual water body. The results of this study indicate that La(OH)3(19)/Al2O3 has fast adsorption kinetics, high adsorption capacity, and good adsorption selectivity for phosphate, which may find potential applications in phosphate removal from wastewater. |
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