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| 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 |
| 投稿时间：2021-04-09 |
| DOI：10.13254/j.jare.2021.0211 |
| 中文关键词: 掺Fe (Ⅱ)羟基磷灰石，铅，吸附，吸附机制 |
| 英文关键词: Fe (Ⅱ) doped hydroxyapatite, Pb (Ⅱ), adsorption, adsorption mechanism |
| 基金项目:国家自然科学基金项目（41961144030） |
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| 中文摘要: |
| 为了开发高效、经济、易得的重金属吸附剂，采用Fe（NO3） 2/Ca（NO3） 2/KH2PO4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 m2·g-1。Fe-HAp对Pb（Ⅱ）的最大吸附量（Qm）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。 |
| 英文摘要: |
| To develop efficient, low-cost, and easy-to-obtain heavy metal adsorbents, Fe(NO3) 2/Ca(NO3) 2/KH2PO4 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 m2·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. |
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