Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water by spray coating on sand in a fluidized bed
Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water by spray coating on sand in a fluidized bed
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DOI：
10.1016/j.powtec.2009.02.007
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发表时间：
2009-07-10
影响因子：
5.2
通讯作者：
Dou, Xiao-Min
中科院分区：
文献类型：
--
作者：
Chen, Lin;Wu, Hai-Xia;Dou, Xiao-Min
开发了流化床中Fe-Al-Ce纳米吸附剂（Fe-Al-Ce）造粒技术。将涂层试剂（Fe-Al-Ce 和聚合物胶乳的混合物）喷洒到流化床中的沙子上。通过分析不同包衣时间的样品，研究了颗粒形貌、包衣层厚度、颗粒在水中的稳定性以及对氟化物的吸附能力。涂覆量为3%至36%。随着涂布量的增加。颗粒稳定性下降，吸附能力增加。 FTIR分析表明，胶乳可与Fe-Al-Ce吸附剂上的活性羟基发生反应，导致吸附容量下降。包衣量为27.5%的包衣颗粒在pH 7、初始氟浓度0.001 M时的氟吸附容量为2.22 mg/g（包衣颗粒）。经柱试验表明，在初始氟浓度5.5 mg/L、空速5 h(-1)、pH 2.0条件下，1.0 mg/L以下的出水可处理300床体积的出水。 5.8. Fe-Al-Ce吸附剂的包覆造粒可生产可用于填充床的颗粒，用于去除饮用水中的氟化物。 (C) 2009 Elsevier B.V. 保留所有权利。
A technology for the granulation of Fe-Al-Ce nano-adsorbent (Fe-Al-Ce) in a fluidized bed was developed. The coating reagent, a mixture of Fe-Al-Ce and a polymer latex, was sprayed onto sand in a fluidized bed. The granule morphology, coating layer thickness, granule stability in water and adsorption capacity for fluoride was investigated by analyzing samples for different coating time. The coating amount was from 3% to 36%. With increasing coating amount. granule stability decreased and adsorption capacity increased. FTIR analysis showed that the latex can react with active hydroxyl on the Fe-Al-Ce adsorbent, which led to a decrease of the adsorption capacity. Coated granules with a coating amount of 27.5% had a fluoride adsorption capacity of 2.22 mg/g (coated granules) at pH 7 and initial fluoride concentration of 0.001 M. A column test showed that 300 bed volumes can be treated with the effluent under 1.0 mg/L at an initial fluoride concentration of 5.5 mg/L, space velocity of 5 h(-1) and pH of 5.8. The coating granulation of the Fe-Al-Ce adsorbent can produce granules that can be used in a packed bed for the removal of fluoride from drinking water. (C) 2009 Elsevier B.V. All rights reserved.