《Journal of Hazardous Materials》杂志刊登“饮用水除氟羟基磷灰石/硅镁土复合小球材料的热再生”

作  者：Li Feng, Weihua Xu, Tengfei Liu, Jason Liu

刊  物：《Journal of Hazardous Materials》，2012年，221-222卷第30期，228-235页

关键词：羟基磷灰石/硅镁土复合小球；热再生；除氟；吸附法

摘  要：再生是评价一种吸附材料的一个关键性因素。本文对羟基磷灰石/硅镁土复合小球材料的一种新型热再生方法进行研究。对再生温度、再生时间、再生效果指标进行测试。描述了一个热再生可能的机制，并解释为XPS、具有EDAX的SEM。穿透的HAP/ATT复合小球可使用沸水或水蒸汽再生使用超过10个周期。与一个单一的除氟周期相比总吸附量提高了10倍。再生过程包括通过加热这种复合材料促使吸附在小球表面的F^-快速进入到大部分HAP的内部。从而表面活性中心再次暴露，小球恢复它们对氟化物的螯合属性。HAP/ATT复合小球已经成功地去除了取自氟污染村庄农田水中的氟化物。在相同容器内进行除氟和再生循环提供了一种高效和简单的操作方法。热再生过程中不使用化学药剂，没有废弃产物的生成，几乎是一个零排放过程。该方法能够非常容易地扩大应用到一个大型的净水工程。

Heat regeneration of hydroxyapatite/attapulgite composite beads for defluoridation of drinking water

Authors: Li Feng, Weihua Xu, Tengfei Liu, Jason Liu

Journal: Journal of Hazardous Materials, Volume 221-222, Number 30 (2012), 228-235

Key words: Hydroxyapatite/attapulgite composite beads; Heat regeneration; Defluoridation; Adsorption

Abstract: 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.

原文链接：http://www.sciencedirect.com/science/article/pii/S0304389412004311