纳米水合氧化铈的制备及其对酸性废水中Pb2+的吸附特性研究
陈嘉超 , 陈志辉 , 朱雅娴 , 许海民 , 杜玉洁 , 徐浩元 , 杨文澜
现代化工 ›› 2025, Vol. 45 ›› Issue (4) : 124 -129.
纳米水合氧化铈的制备及其对酸性废水中Pb2+的吸附特性研究
Preparation of nano hydrated cerium oxide and its adsorption properties for Pb2+ in acidic wastewater
采用液相沉淀法成功制备了具有高比表面积(243.5 m2/g)的水合氧化铈纳米吸附剂(HCO),研究了HCO对酸性废水中Pb2+的去除特性。结果表明,HCO以纳米颗粒和纳米团簇(20~50 nm)的形态存在,且在3~7的pH区间内表现出优异的化学稳定性;HCO在pH为5~6的条件下对Pb2+的去除性能最佳,通过静电吸引和内配位络合的综合作用,在高浓度的共存离子体系中实现Pb2+的选择性吸附。HCO对Pb2+的吸附动力学研究结果表明,该过程与准二级动力学模型相吻合,且在180 min内达到吸附平衡。酸性NaNO3溶液能够有效再生吸附饱和的HCO,且再生后HCO的吸附效率未见明显衰减,具备长期循环利用的潜力,是酸性废水深度除铅的理想吸附材料。
A hydrated cerium oxide (HCO) nano-adsorbent with a high specific surface area (243.5 m2·g-1) is prepared through a liquid phase precipitation method,and its characteristics in removing Pb2+ from acidic wastewater is studied.Experimental results reveal that HCO primarily exists in the forms of nano-scale particles and clusters with size ranging from 20 nm to 50 nm,exhibiting excellent chemical stability within a pH range of 3-7.The optimal performance of HCO for removing Pb2+ is observed at pH=5-6,which can be attributed to a synergistic effect between electrostatic attraction and inner coordination complexation,achieving selective adsorption of Pb2+ even in the presence of coexisting ions with high concentration.The adsorption process follows a pseudo-second-order kinetic model,with an equilibrium time of 180 min.Efficient regeneration of saturated HCO adsorbent is achieved by using acidic NaNO3 solution,without significant decline in adsorption performance after regeneration.The regenerated HCO exhibits a potential for long-term recycling and re-utilization,demonstrating a promising application prospect in the field of lead removal from acidic wastewater.
nano hydrated cerium oxide / selective adsorption / lead / acidic wastewater
| [1] |
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| [2] |
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| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
|
| [29] |
|
| [30] |
|
| [31] |
|
| [32] |
|
| [33] |
|
| [34] |
|
| [35] |
卢予沈, 宗莉, 于惠. 混合金属氧化物/碳复合材料的制备及其对Pb(Ⅱ)的吸附性能[J]. 环境科学, 2021, 42:5450-5459. |
| [36] |
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国家自然科学基金面上项目(52070160)
江苏省重点研发计划社会发展项目(BE2023751)
扬州大学高端人才支持计划
宜兴市“陶都英才”创新创业人才项目(CX202011C)
宜兴市科技创新专项资金重点研发项目(Y2022002)
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