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Unique lead adsorption behavior of ions sieves in pellet-like reduced graphene oxide

机译:离子筛中的独特铅吸附行为在颗粒状的氧化石墨烯氧化物中

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摘要

Hollow and pellet-like reduced graphene oxide (P-RGO) was synthesized by electrostatic assembly and acid-treatment. The average size and shell thickness of P-RGO were 65.9 nm and 4 nm, respectively. The adsorption capacity of P-RGO for lead ions was as high as 184.5 mg g(-1) and the adsorption equilibrium of lead ions (50 mg L-1) was achieved within 5 min. Lead ion removal by adsorption onto P-RGO increased with decreasing pH. Because P-RGO exhibited stronger affinity for lead ions than for water, lead ions could be drawn and stored into the cavity in the P-RGO, i.e., ions storage effect was observed. This led to high adsorption capacity and abnormal adsorption behavior. The adsorption mechanism was proposed as ions exchange and competitive process for layer RGO and P-RGO, respectively. This study suggested that structure reconstruction of materials could enhance the efficiency and capacity for unique metal removal.
机译:通过静电组件和酸处理合成中空和颗粒状还原的石墨烯氧化物(P-RGO)。 P-RGO的平均尺寸和壳厚度分别为65.9nm和4nm。 铅离子的P-RGO的吸附容量高达184.5mg(-1),在5分钟内实现铅离子的吸附平衡(50mg L-1)。 通过减少pH值,通过吸附到p-rgo上的铅离子移除。 因为P-RGO对铅离子的较强亲和力而不是水,所以可以将铅离子拉伸并储存到P-RGO中的腔中,即,观察到离子储存效果。 这导致了高吸附容量和异常的吸附行为。 吸附机制分别提出了层rgo和p-rgo的离子交换和竞争过程。 本研究表明,材料的结构重建可以提高独特金属去除的效率和能力。

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  • 来源
    《RSC Advances》 |2015年第90期|共7页
  • 作者单位

    Minnan Normal Univ Dept Chem &

    Environm Zhangzhou 363000 Fujian Peoples R China;

    Minnan Normal Univ Dept Chem &

    Environm Zhangzhou 363000 Fujian Peoples R China;

    Minnan Normal Univ Dept Chem &

    Environm Zhangzhou 363000 Fujian Peoples R China;

    Minnan Normal Univ Dept Chem &

    Environm Zhangzhou 363000 Fujian Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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