掺Fe(Ⅱ)羟基磷灰石对水溶液中Pb(Ⅱ)吸附性能研究  

Study on the adsorption performance of Fe(Ⅱ)-doped hydroxyapatite for Pb(Ⅱ)in aqueous solution

作　　者：李辉[1] 江群[1] 姜思盟 曲建华 姜昭[1] 张颖[1] LI Hui;JIANG Qun;JIANG Simeng;QU Jianhua;JIANG Zhao;ZHANG Ying(School of Resources and Environment,Northeast Agricultural University,Harbin 150030,China)

机构地区：[1]东北农业大学资源与环境学院,哈尔滨150030

出　　处：《农业资源与环境学报》2022年第4期698-706,共9页Journal of Agricultural Resources and Environment

基　　金：国家自然科学基金项目(41961144030)。

摘　　要：为了开发高效、经济、易得的重金属吸附剂,采用Fe(NO_(3))_(2)/Ca(NO_(3))_(2)/KH_(2)PO_(4)混合溶液在碱性条件下通过水合法制备掺Fe(Ⅱ)羟基磷灰石(Fe-HAp),以未改性羟基磷灰石(HAp)为对照材料,通过化学表征和批量吸附实验,探究Fe-HAp对水溶液中Pb(Ⅱ)的吸附性能与吸附机制。结果表明:Fe-HAp表面均匀地分布着大量纳米级颗粒,具有大量表面官能团,其比表面积为55.66 m^(2)·g^(-1)。Fe-HAp对Pb(Ⅱ)的最大吸附量(Q_(m))高达224.44 mg·g^(-1),是HAp的1.85倍,高于文献报道的代表性HAp类吸附剂。Fe-HAp对Pb(Ⅱ)吸附过程符合拟二级动力学模型和Langmuir吸附等温模型,且对Pb(Ⅱ)的吸附是自发的吸热过程。Fe-HAp对水溶液中Pb(Ⅱ)的高效吸附性能主要是离子交换、静电引力、络合沉淀的共同作用。此外,Fe-HAp具有较好的可重复利用性,其实际应用潜力较大。To develop efficient,low-cost,and easy-to-obtain heavy metal adsorbents,Fe(NO_(3))_(2)/Ca(NO_(3))_(2)/KH_(2)PO_(4) solution was used to prepare Fe(Ⅱ)-doped hydroxyapatite(Fe-HAp)by hydration under alkaline conditions.Unmodified hydroxyapatite(HAp)was used as the control material.Batch adsorption experiments and chemical characterization were performed to explore the adsorption performance and adsorption mechanism of Fe-HAp for Pb(Ⅱ)in aqueous solution.Fe-HAp contained a large number of nano-scale particles uniformly distributed on the surface with a large number of surface functional groups,and the specific surface area of Fe-HAp was 55.66 m^(2)·g^(-1).The maximum adsorption quantity(Qm)of Fe-HAp for Pb(Ⅱ)was 224.44 mg·g^(-1),1.85 times higher than that of HAp,and Fe-HAp was better than the representative HAp adsorbents reported previously.The adsorption of Fe-HAp on Pb(Ⅱ)conformed to the pseudo-second-order kinetic model and Langmuir adsorption isotherm model,and the adsorption of Pb(Ⅱ)was a spontaneous endothermic process.The highefficiency adsorption performance of Fe-HAp for Pb(Ⅱ)in aqueous solution is mainly due to the combined effects of ion exchange,electrostatic attraction,complexation,and precipitation.Fe-HAp has good reusability,with great potential for practical applications.

关 键 词：掺Fe(Ⅱ)羟基磷灰石 铅 吸附 吸附机制 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]