层状双氢氧化物
氟化物
吸附
铝
水处理
无机化学
离子交换
吸收(声学)
活性氧化铝
材料科学
化学
污染
离子
化学工程
冶金
废物管理
复合材料
有机化学
工程类
生物
生态学
作者
Yu-Liu Li,Riccardo Narducci,Alessandra Varone,Saulius Kaciulis,Eleonora Bolli,Roberto Pizzoferrato
出处
期刊:Processes
[MDPI AG]
日期:2021-11-24
卷期号:9 (12): 2109-2109
被引量:1
摘要
Fluoride excess in water represents an environmental issue and a risk for human health since it can cause several diseases, such as fluorosis, osteoporosis, and damage of the nervous system. Layered double hydroxides (LDHs) can be exploited to remove this contaminant from water by taking advantage of their high ion-exchange capability. LDHs are generally mixed with polluted water in the form of powders, which then cause the problem of uneasy separation of the contaminated LDH sludge from the purified liquid. In this work, Zn–Al LDH films were directly grown in situ on aluminum foams that acted both as the reactant and substrate. This method enabled the removal of fluoride ions by simple immersion, with ensuing withdrawal of the foam from the de-contaminated water. Different LDH synthesis methods and aluminum foam types were investigated to improve the adsorption process. The contact time, initial fluoride concentration, adsorbent dosage, and pH were studied as the parameters that affect the fluoride adsorption capacity and efficiency. The highest absorption efficiency of approximately 70% was obtained by using two separate growth methods after four hours, and it effectively reduced the fluoride concentration from 3 mg/L to 1.1 mg/L, which is below the threshold value set by WHO for drinking water.
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