中文关键词环境矿物沸石地下水水处理吸附机制 英文关键词environmental mineralszeolitegroundwaterwater treatmentadsorption mechanism

作者	单位	E-mail
马文婕	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009	673839794@qq.com
陈天虎	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009	chentianhu@hfut.edu.cn
陈冬	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009
刘海波	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009
程鹏	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009
张泽鑫	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009
陶琼	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009
张玉珠	合肥工业大学资源与环境工程学院, 纳米矿物与污染控制安徽省重点实验室, 合肥 230009

中文摘要 以天然沸石颗粒、高锰酸钾、硫酸锰为原料，通过常温氧化还原沉淀法制备δ-MnO₂/沸石纳米复合材料，用于同时去除地下水中铁锰氨氮.扫描电镜（SEM）、透射电镜（TEM）、Zeta电位、红外光谱（FTIR）和X射线光电子能谱（XPS）表征负载锰氧化物和吸附离子的存在形态，探讨δ-MnO₂/沸石对Fe²⁺、Mn²⁺和NH₄⁺-N的吸附机制.通过静态无/低氧水处理实验研究了δ-MnO₂/沸石对Fe²⁺、Mn²⁺和NH₄⁺-N的吸附性能.结果表明，沸石表面负载的锰氧化物为δ-MnO₂；复合材料对3种离子的吸附符合准二级动力学，吸附等温曲线符合Langmuir模型，最大饱和吸附容量可分别达到215.1、23.6和7.64 mg·g^-1；水中氨氮去除机制是沸石对NH₄⁺的优先选择性离子交换吸附；水中Fe²⁺和Mn²⁺的去除是沸石颗粒表面负载δ-MnO₂的吸附和催化氧化作用.研究表明δ-MnO₂/沸石纳米复合材料可以作为一种高效吸附剂同时去除水中的Fe²⁺、Mn²⁺和NH₄⁺-N离子. 英文摘要 δ-MnO₂/zeolite nanocomposites were prepared with natural zeolite, potassium permanganate, and manganese sulfate by oxidation-reduction precipitation, which were used to simultaneously remove Fe²⁺, Mn²⁺, and NH₄⁺-N from groundwater. To investigate the performance and mechanism of Fe²⁺, Mn²⁺, and NH₄⁺-N removal from groundwater by δ-MnO₂/zeolite nanocomposites, static batch experiments were conducted under different environmental conditions in a zero-oxygen atmosphere using SEM, TEM, Zeta potential, FTIR, and XPS techniques. The experimental results showed that the manganese-oxide-coated natural zeolite was δ-MnO₂, and Fe²⁺, Mn²⁺, and NH₄⁺-N adsorption on the δ-MnO₂/zeolite nanocomposites could be best described with the pseudo-second-order kinetic model and the Langmuir model. In addition, the maximum adsorption capacities of Fe²⁺, Mn²⁺, and NH₄⁺-N were calculated to be 215.1, 23.6, and 7.64 mg·g^-1, respectively. The removal mechanism of NH₄⁺-N from the solutions by zeolite was via the action of ion exchange, and the adsorption and oxidation catalysis of δ-MnO₂-coated zeolite were responsible for the removal of Fe²⁺ and Mn²⁺. This research indicates that δ-MnO₂/zeolite nanocomposites could be used as highly efficient adsorbents to simultaneously remove Fe²⁺, Mn²⁺, and NH₄⁺-N from water.

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