中文关键词铁钛复合氧化物共沉淀机械物理混合磷吸附 英文关键词iron-titanium binary oxidecoprecipitationphysical mixingphosphateadsorption

作者	单位	E-mail
仲艳	中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东省海岸带环境工程技术研究中心, 烟台 264003 中国科学院大学, 北京 100049	zhongy_1216@163.com
王建燕	中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东省海岸带环境工程技术研究中心, 烟台 264003 中国科学院大学, 北京 100049
陈静	中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东省海岸带环境工程技术研究中心, 烟台 264003	jchen@yic.ac.cn
张高生	广州大学, 珠江三角洲水质安全与保护协同创新中心暨省部共建重点实验室, 广州 510006	zgs77@126.com

中文摘要 为了研究制备方法对金属复合氧化物表面性质与吸附性能的影响，本文分别采用共沉淀法与机械物理混合法制备了铁钛复合氧化物^CFe-Ti与^MFe-Ti.采用SEM、BET、XRD与FTIR等表征技术，研究了两种铁钛复合氧化物^CFe-Ti与^MFe-Ti的形貌结构、比表面积、表面羟基浓度等表面特性；通过批式吸附实验，考察了其磷吸附性能.结果表明，与纯的氧化物FeOOH及TiO₂相比，共沉淀法制备的^CFe-Ti纳米颗粒更疏松，孔结构更发达，表面羟基浓度更高，^CFe-Ti的最大磷吸附容量达40.6 mg·g^-1，高于纯FeOOH（27.2 mg·g^-1）与TiO₂（16.7 mg·g^-1），分别为其1.5倍和2.4倍，展示了显著的协同效应.而^MFe-Ti的形貌结构和表面性质与FeOOH及TiO₂相比变化不大，其磷最大吸附容量为22.7 mg·g^-1，不仅明显低于^CFe-Ti，且低于纯FeOOH，表明未产生协同效应.研究也表明，磷在^CFe-Ti与^MFe-Ti表面的吸附性质未发生变化，均通过形成内层表面络合物而发生了化学吸附.因此，金属复合氧化物的表面性质和吸附性能与其制备方法密切相关，与机械物理混合法相比，共沉淀法是一种更为简单经济制备高效能铁钛复合氧化物磷吸附剂的方法. 英文摘要 To investigate the effect of preparation methods on surface characteristics and adsorption properties of the formed metal composite oxides, two kinds of iron-titanium binary oxides were synthesized by a coprecipitation method or a physical mixing method and were denoted as ^CFe-Ti and ^MFe-Ti, respectively. The prepared ^CFe-Ti and ^MFe-Ti were systematically characterized using SEM, XRD, BET, and FTIR techniques. Their phosphate adsorption behaviors were also studied via batch adsorption experiments. Compared with pure FeOOH and TiO₂, ^CFe-Ti exhibited a looser nanostructure with more pore and surface hydroxyls. Moreover, the ^CFe-Ti had a high maximal phosphorus adsorption capacity of 40.6 mg·g^-1, which is about 1.5 times and 2.4 times as high as that of pure FeOOH (27.2 mg·g^-1) and TiO₂ (16.7 mg·g^-1), respectively. This suggests that an obvious synergistic effect is present in the ^CFe-Ti system. However, the morphology and structure of ^MFe-Ti were not significantly different from those of pure FeOOH and TiO₂. The maximal adsorption capacity of ^MFe-Ti was 22.7 mg·g^-1, which is obviously lower than that of ^CFe-Ti and even lower than that of pure FeOOH. Evidently, there is no synergistic effect in the ^MFe-Ti system. In addition, phosphate adsorption mechanisms at the surface of ^CFe-Ti and ^MFe-Ti were the same as those of their component oxides, and chemical adsorption occurred at the surface of the oxides through the formation of inner-sphere complexes. Therefore, the surface characteristics and adsorption properties of the metal composite oxides were closely related to their preparation methods. The coprecipitation method was a simpler and more economical way than the physical mixing method to fabricate a highly effective iron-titanium binary oxide for phosphate adsorption.

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