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首页> 外文期刊>RSC Advances >Unique and outstanding cadmium sequestration by polystyrene-supported nanosized zirconium hydroxides: a case study
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Unique and outstanding cadmium sequestration by polystyrene-supported nanosized zirconium hydroxides: a case study

机译：由聚苯乙烯负载纳米氧化锆氢氧化物独特而优秀的镉封存：一个案例研究

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摘要

Water pollution by heavy metals remains a serious environmental and health issue. Herein, a new hybrid adsorbent was prepared for selective Cd(II) sequestration by immobilizing nanosized zirconium hydroxides (HZO) onto a macroporous cation exchanger. The positively charged SO3-H group within the host matrix can accelerate the target Cd(II) ions diffusion and enrichment, combining with the strong adsorption by HZO nanoparticles. Solution pH influence proves that Cd(II) can be efficiently eliminated by HZO-PS in a wide pH range of 2.5-7.0 with negligible Zr(IV) releases. Both HZO-PS and PS exhibit similar and fast kinetic behaviors by approaching sorption equilibrium within 150 min. Such results can be ascribed to the unique surface-charged groups for accelerating Cd(II) diffusion. Moreover, HZO-PS also exhibits favorable sorption selectivity in the presence of common cations at high levels. Fixed-bed column experiments further demonstrate its efficient applicability with the treated capacity of 750 bed volume (BV) per run and the exhausted HZO-PS can be readily regenerated using binary HNO3 and Ca(NO3)(2) mixtures for repeated use. All the results suggest that the hybrid material HZO-PS is a promising adsorbent for cadmium retention in water.
机译：重金属的水污染仍然是一个严重的环境和健康问题。在此，通过将纳米锆锆（HZO）固定到大孔阳离子交换器上，制备用于选择性CD（II）螯合剂的新型杂化吸附剂。宿主基质内的带正电荷的SO3-H组可以加速靶CD（II）离子扩散和富集，与HZO纳米颗粒的强烈吸附相结合。溶液pH的影响证明CD（II）可以通过HZO-PS在2.5-7.0的宽pH范围内有效地消除CD（II），其具有可忽略的ZR（IV）释放。 HZO-PS和PS均通过在150分钟内接近吸附平衡来表现出类似和快速的动力学行为。这些结果可以归因于独特的表面带电组，用于加速CD（II）扩散。此外，HZO-PS在高水平的常见阳离子存在下也表现出有利的吸附选择性。固定床柱实验进一步证明其具有每次运行的750床体积（BV）的经处理能力的有效适用性，并且可以使用二元HNO3和Ca（NO 3）（2）混合物来容易地再生排气的HZO-PS进行重复使用。所有结果表明，杂化材料HZO-PS是一种有希望的吸附剂，用于水中的镉潴留。

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  • 来源
    《RSC Advances》 |2015年第68期|共8页
  • 作者

    Zhang Qingrui; Teng Jie; Zhang Zhaoxiang; Nie Guangze; Zhao Hongwei; Peng Qiuming; Jiao Tifeng;

  • 作者单位

    Yanshan Univ Sch Environm &

    Chem Engn Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Sch Environm &

    Chem Engn Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Sch Environm &

    Chem Engn Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Nanjing Tech Univ Sch Environm Coll Environm Sci &

    Engn Nanjing Jiangsu Peoples R China;

    Yanshan Univ Sch Environm &

    Chem Engn Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao Hebei Peoples R China;

    Yanshan Univ Sch Environm &

    Chem Engn Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

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