Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water using inorganic binder
Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water using inorganic binder
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使用无机粘合剂造粒用于饮用水除氟的 Fe-Al-Ce 纳米吸附剂
DOI：
10.2166/ws.2013.136
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发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
Yong Jin
中科院分区：
文献类型：
--
作者：
Lin Chen;Ting-Jie Wang*;Li-Xin Yu;Yong Jin
纳米吸附剂通常具有较高的氟吸附容量。然而，由于它们的低水力传导性，它们不能用于填充床。用有机粘合剂造粒通常会导致吸附容量的巨大损失，这是由于吸附剂的活性位点被有机粘合剂广泛占据。使用无机溶胶作为粘合剂预期具有减少吸附容量损失的潜力。本文以铝、锆、钛和硅溶胶为粘结剂，对Fe-Al-Ce纳米吸附剂进行造粒研究。将纳米吸附剂与溶胶混合并干燥成块状，然后煅烧并研磨成粉末。分析了复合粉体的形貌、吸附性能和结构。作为一个优化，选择铝溶胶作为粘结剂的Fe-Al-Ce纳米吸附剂的造粒挤出法。研究了溶胶对吸附剂性能和颗粒结构的影响。结果表明，该颗粒对Fe-Al-Ce纳米吸附剂具有较高的吸附容量，吸附容量可达90%以上，远高于我们前期研究中以丙烯酸-苯乙烯共聚物乳液为粘结剂的吸附容量。铝溶胶是一种不破坏Fe-Al-Ce吸附剂活性羟基的粘结剂。
Nano-adsorbents usually have high fluoride adsorption capacity. However, they cannot be used in packed beds because of their low hydraulic conductivity. Granulation with organic binder usually causes a great loss of adsorption capacity due to the active sites of the adsorbent being extensively occupied by the organic binder. Using inorganic sol as a binder is expected to have a potential for reducing the loss of adsorption capacity. In this paper, aluminium, zirconium, titanium and silica sol were employed as binders for Fe-Al-Ce nano-adsorbent granulation. The nano-adsorbent was mixed with sol and dried to form lumps, then calcinated and ground into powder. The morphology, adsorption capacity and structure of the compound powder were analysed. As an optimization, aluminium sol was selected as a binder in the granulation of Fe-Al-Ce nano-adsorbent using extrusion method. The effects of sol on the adsorbent and the granule structure were characterized. The granules showed a high adsorption capacity, reaching over 90% capacity of Fe-Al-Ce nano-adsorbent, much higher than that of using acrylic-styrene copolymer latex as a binder in our previous research. It is inferred that aluminium sol is a suitable binder which does no damage to the active hydroxyl group of Fe-Al-Ce adsorbent.
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