摘要
制备3%NaCl改性沸石负载羟基磷灰石复合材料(NaZH),采用摇瓶试验研究pH、材料投加量、Mn^(2+)初始浓度和反应时间对NaZH吸附Mn^(2+)效果的影响,并通过吸附动力学模型和吸附等温模型初步分析吸附机理。此外,应用SEM-EDS、BET、FTIR和XPS等表征手段进一步探究NaZH的材料性质及反应机理。结果表明,Mn^(2+)溶液pH=7、初始浓度5 mg/L、NaZH投加量2 g/L和反应时间240 min为最佳吸附条件,此时Mn^(2+)去除率和吸附量分别为99.25%和2.58 mg/g。吸附过程符合Freundlich模型和准二级动力学模型,为多层化学吸附。表征结果显示,NaZH是羟基磷灰石包裹在沸石表面的复合材料,粗糙多孔,官能团丰富。NaZH主要以溶解-沉淀、离子交换和表面络合三种形式吸附Mn^(2+)。
3%NaCl-modified zeolite loaded hydroxyapatite(NaZH)material was prepared.The effects of pH value,material dosage,initial concentration of Mn^(2+)and reaction time on the adsorption of Mn^(2+)by NaZH were studied by shake-flask experiment.The adsorption mechanism was preliminically analyzed by adsorption kinetics model and adsorption isothermal model.In addition,SEM-EDS,BET,FTIR and XPS were used to further investigate the material properties and reaction mechanism of NaZH.The results show that the removal rate and adsorption capacity of Mn^(2+)is 99.25%and 2.58 mg g respectively under the optimal adsorption conditions including pH=7,initial concentration of 5 mg L,NaZH dosage of 2 g L and reaction time of 240 min.The adsorption process is a multilayer chemisorption which conforms to the Freundlich model and quasi-second-order kinetic model.The characterization results show that NaZH is a composite of hydroxyapatite coated zeolite with rough surface and abundant functional groups.Furthermore,the adsorption of Mn^(2+)is mainly in three forms:solution-precipitation,ion exchange and surface complexation.
作者
容智尔
张卫民
卢琪愿
彭惠靖
RONG Zhier;ZHANG Weimin;LU Qiyuan;PENG Huijing(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)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2024年第4期129-138,共10页
Nonferrous Metals（Extractive Metallurgy)
基金
江西省自然科学基金资助项目(20202BABL204069)
核资源与环境国家重点实验室自主基金项目(2020Z06)。
