复合材料HAP@nZVI对Mn(Ⅱ)的吸附性能与机理  

Adsorption Performance and Mechanism of Hydroxyapatite@Nano-Zero-Valent Iron Composites on Mn(Ⅱ)

作　　者：彭惠靖 张卫民[1,2,3] 王玉罡 卢琪愿 王新宇 PENG Huijing;ZHANG Weimin;WANG Yugang;LU Qiyuan;WANG Xinyu(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;Key Laboratory of Environmental Monitoring and Management of Mines in Poyang Lake Region,Ministry of Natural Resources,East China University of Technology,Nanchang 330013,China;School of Environmental Science and Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]东华理工大学水资源与环境工程学院,南昌330013 [3]东华理工大学自然资源部,环鄱阳湖区域矿山环境监测与治理重点实验室,南昌330013 [4]西南交通大学环境科学与工程学院,成都611756

出　　处：《材料导报》2024年第16期44-51,共8页Materials Reports

基　　金：江西省自然科学基金(20202BABL204069);核资源与环境国家重点实验室自主基金(2020Z06)。

摘　　要：使用液相还原法制备羟基磷灰石与纳米零价铁(HAP@nZVI)复合材料,采用实验室静态批试验探讨其对模拟Mn(Ⅱ)污染地下水的处理效果及机理。表征结果显示,HAP@nZVI复合材料表面分布不均匀、松散多孔,nZVI不均匀分布在HAP表面及空隙中。静态批试验结果表明,在溶液pH=5、复合材料用量0.36 g·L^(-1)、反应时间t=180 min条件下最有利于HAP@nZVI复合材料对Mn(Ⅱ)的吸附,在该试验条件范围内,Mn(Ⅱ)最大吸附量达到31.4 mg·g^(-1),准二级动力学模型和Langmuir吸附等温线模型可以较好地描述HAP@nZVI复合材料对Mn(Ⅱ)的吸附过程,吸附过程属于单层吸附且主要为化学吸附。反应后复合材料整体结构没有发生较大改变,-OH、Fe-O、P-O基团均参与了反应。XPS表征可以进一步证实HAP@nZVI对锰的吸附机理,O 1s和P_(2)p的结合能发生位移表明有表面络合作用发生;铁的溶出以及Fe^(0)消逝表明存在氧化还原反应;Ca_(2)p轨道的峰强降低说明存在离子交换。最后,将HAP@nZVI复合材料与已报道的吸附剂对锰离子的吸附性能进行对比,结果表明本研究制备的材料吸附性能良好。Hydroxyapatite and nano-zero-valent iron(HAP@nZVI)composites were prepared by liquid phase reduction method.The treatment effect and mechanism of simulated Mn(II)contaminated groundwater was investigated by static batch tests in laboratory.The characterization results show that the surface of HAP@nZVI composites is uneven and the composites exhibit well-developed porous structure,and nZVI is unevenly distributed in HAP surface and voids.Static batch test results show that under the conditions of solution pH=5,composite dosage 0.36 g/L and reaction time t=180 min,HAP@nZVI composites has the best adsorption effect on Mn(Ⅱ).The maximum adsorption capacity of Mn(Ⅱ)reaches 31.4 mg·g^(-1)within the range of the test conditions.The quasi-second-order kinetic model and Langmuir adsorption isotherm model can well describe the adsorption process of Mn(Ⅱ)by HAP@nZVI composites,indicating that the adsorption process belongs to single-layer adsorption and is mainly controlled by chemical adsorption.After the reaction,the overall structure of the composite did not change greatly,and-OH,Fe-O,and P-O groups all participate in the reaction.The adsorption mechanism of Mn(Ⅱ)by HAP@nZVI can be further confirmed by XPS characterization.The shift of binding energy about oxygen O 1s and phosphorus P_(2)p indicate that surface complexation occurs.The dissolution of iron and the disappearance of Fe^(0)indicate the existence of REDOX reaction.The decrease in the peak strength of the Ca_(2)p orbital indicates the pre-sence of ion exchange.Finally,the adsorption properties of HAP@nZVI composites and reported adsorbents for manganese ions were compared,and the results show that the material in this study has good adsorption properties.

关 键 词：HAP@nZVI复合材料 Mn(Ⅱ) 静态批试验 吸附 

分 类 号：X524[环境科学与工程—环境工程] X591