| 氢氧化镧交联壳聚糖微球的微流控制备及其除磷性能 |
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| 引用本文： | 李承威,骆华勇,张铭轩,廖鹏,方茜,荣宏伟,王竞茵. 氢氧化镧交联壳聚糖微球的微流控制备及其除磷性能[J]. 化工学报, 1951, 73(9): 3929-3939. DOI: 10.11949/0438-1157.20220501 |
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| 作者姓名： | 李承威 骆华勇 张铭轩 廖鹏 方茜 荣宏伟 王竞茵 |
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| 作者单位： | 1.广州大学土木工程学院，广东 广州 510006;2.中国科学院地球化学研究所环境地球化学国家重点实验室，贵州 贵阳 550081 |
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| 基金项目： | 广州市科技计划项目(202102020694);广东省自然科学基金项目(2020A1515010856);国家自然科学基金项目(52170071);广东省教育厅创新强校青年创新人才类项目(2019KQNCX109);广州大学研究生创新能力培养资助计划项目(2020GDJC-M49) |
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| 摘 要： | 基于微流控技术制备了氢氧化镧[La(OH)3]交联壳聚糖（CS）微球（La-CS-M），并对其组成和结构进行表征，探究了微球吸附去除水中磷酸盐的性能和机理。结果表明，La-CS-M成功负载了La（OH）3，与传统滴落法制备的氢氧化镧交联壳聚糖球（La-CS）相比，其表面和内部具有疏松多孔结构，其体积平均粒径为415.8 μm，孔隙率为89.22%，平均孔径为960.0 nm，pHpzc约为6.5。La-CS-M在宽pH范围内（3.0~10.0）均保持较高吸附量，对La-CS-M吸附性能影响较Cl-、、以及腐殖酸（HA）明显。吸附动力学数据符合准二级动力学模型，等温吸附数据符合Langmuir模型且在pH=6.0时最大吸附量为56.48 mg/g。结合XPS表征和吸附数据推测La-CS-M的吸附机理涉及静电吸附和形成内层配合物（通过配位交换或Lewis酸碱作用）。吸附磷酸盐后La-CS-M可通过2.5 mol/L NaOH溶液实现脱附，具有良好的再生性和吸附稳定性。
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| 关 键 词： | 氢氧化镧 壳聚糖微球 微流控 制备 吸附 废水 |
| 收稿时间： | 2022-05-04 |
Microfludically-generated lanthanum hydroxide cross-linked chitosan microspheres for phosphate removal |
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| Chengwei LI,Huayong LUO,Mingxuan ZHANG,Peng LIAO,Qian FANG,Hongwei RONG,Jingyin WANG. Microfludically-generated lanthanum hydroxide cross-linked chitosan microspheres for phosphate removal[J]. Journal of Chemical Industry and Engineering(China), 1951, 73(9): 3929-3939. DOI: 10.11949/0438-1157.20220501 |
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| Authors: | Chengwei LI Huayong LUO Mingxuan ZHANG Peng LIAO Qian FANG Hongwei RONG Jingyin WANG |
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| Affiliation: | 1.School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China;2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou, China |
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| Abstract: | Lanthanum hydroxide [La(OH)3] cross-linked chitosan (CS) microspheres (La-CS-M) were prepared based on microfluidic technology. The compositions and structures of La-CS-M were characterized by various means. The performance and mechanism of its adsorption and removal of phosphate in water were explored. The results showed that La(OH)3 was successfully loaded within La-CS-M. Compared with the cross-linked chitosan spheres (La-CS) prepared by traditional dropping method, the surface and interior of La-CS-M were porous with an volumetric mean particle size of 415.8 μm, porosity of 89.22%, average pore size of 960.0 nm, and pHpzc of about 6.5. La-CS-M maintained a high adsorption capacity in a wide pH range from 3.0 to 10.0, and the presence of had a more negative effect on phosphate adsorption compared to Cl-, , and humic acid (HA). The adsorption kinetic data and isotherm results were well fitted with pseudo-second-order model and Langmuir model, achieving a maximum adsorption capacity of 56.48 mg/g at pH 6.0. Combined with XPS characterization and adsorption data, it could be deducted that the adsorption mechanism of La-CS-M involved electrostatic adsorption and formation of inner sphere complex (through coordination exchange or Lewis acid-base interaction). After phosphate adsorption, La-CS-M could be desorbed by 2.5 mol/L NaOH solution, exhibiting good reproducibility and adsorption stability. |
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| Keywords: | lanthanum hydroxide chitosan microspheres microfluidic preparation adsorption wastewater |
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