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首页> 外文期刊>Journal of Hazardous Materials >Heat regeneration of hydroxyapatite/attapulgite composite beads for defluoridation of drinking water
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Heat regeneration of hydroxyapatite/attapulgite composite beads for defluoridation of drinking water

机译：羟基磷灰石/凹凸棒复合珠的热再生用于饮用水除氟

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摘要

Regeneration is one of the key factors in evaluating an adsorbent. A novel heat regeneration method for hydroxyapatite/attapulgite (HAP/ATT) composite beads was studied. The investigation included heat regeneration temperature, regeneration time, and regeneration effects. A possible mechanism for the heat regeneration is described that explains the results of XPS, and SEM with EDAX. Exhausted HAP/ATT composite beads can be regenerated for more than 10 cycles using boiling water or steam. The total capacity increases by 10 times compared to a single defluoridation cycle. The regeneration process involves F~ ions adsorbed on the surface of the beads to move quickly into the bulk of the HAP through the effect of heating this composite material. The surface active sites are thus re-exposed and the beads recover their fluoride sequestration properties. HAP/ATT composite beads were successfully used for the removal of fluoride from field water taken from a nearby village where fluoride contamination is endemic. Defluoridation and regeneration cycles performed in the same container provide a high efficient and simple operation. No chemical agents are used and no waste products are produced during the heat regeneration process, so this is a nearly zero emission process. This method can easily be up-scaled to a large throughput application.
机译：再生是评估吸附剂的关键因素之一。研究了羟基磷灰石/凹凸棒石（HAP / ATT）复合珠的新型热再生方法。研究包括热再生温度，再生时间和再生效果。描述了一种热再生的可能机理，该机理解释了XPS和EDAX的SEM结果。耗尽的HAP / ATT复合珠可以使用沸水或蒸汽再生超过10个循环。与单个脱氟循环相比，总容量增加了10倍。再生过程涉及吸附在微珠表面的F离子通过加热这种复合材料的作用而迅速移动到HAP的主体中。因此，表面活性部位被重新暴露，并且珠粒恢复了其氟离子螯合特性。 HAP / ATT复合珠粒已成功用于去除附近氟化物流行的村庄的田间水中的氟化物。在同一容器中执行的除氟和再生循环可提供高效且简单的操作。在热再生过程中不使用任何化学试剂，也不会产生废品，因此这几乎是零排放过程。这种方法可以轻松地扩展到大吞吐量应用程序。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.228-235|共8页
  • 作者

    Li Feng; Weihua Xu; Tengfei Liu; Jason Liu;

  • 作者单位

    School of Chemical Engineering and Technology. China University of Mining and Technology, Xuzhou 221116,]iangsu, China;

    School of Chemical Engineering and Technology. China University of Mining and Technology, Xuzhou 221116,]iangsu, China;

    School of Chemical Engineering and Technology. China University of Mining and Technology, Xuzhou 221116,]iangsu, China;

    Jiangsu Yongguan Water Supply and Drainage Equipment Co. Ltd., Xuzhou 221116, Jiangsu, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hydroxyapatite/attapulgite composite; beads; heat regeneration; defluoridation; adsorption;

    机译：羟基磷灰石/凹凸棒石复合材料;珠子热再生;脱氟吸附;

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