The Fluoride-adsorption Capacity and Influencing Factors Study of Zeolite

2010 International Conference on Challenges in Environmental Science and Computer Engineering Pub Date : 2010-03-06 DOI:10.1109/CESCE.2010.59

Sun Xingbin, Xi Chengju, Hou Zhaochao

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引用次数: 3

Abstract

In modification experiment the best modification method was established. First, natural zeolite was roasted at 600¿ in a muffle furnace for 2h. After cooled to normal temperature, it was soaked in 4% HCl solution on dynamic condition at 65¿ for 1 hour, then soaked in 1mol/L NaOH solution on dynamic condition at 40¿ for 1 hour. The preconditioned zeolite was then was soaked in 10%AlCl3 solution on dynamic condition at 40¿ for 20 hour. In the end, it was treated in water vapour for 1 hour. Static experiment was carried out in order to examine defluorination ability of modified zeolite. The results showed that the adsorption capacity of zeolite was greatly enhanced after being modified, which obtained 0.25mg/g for fluoride solution with 20mg/L concentration. There were many factors affecting the adsorption capacity of modified zeolite. Among all the factors, the pH value and concentration of raw water and the running speed in dynamic experiment had greater influence. The structures of natural zeolite and modified zeolite were observed by SEM, XRD and FT-IR. Based on these, the reason and effect of modification were further analyzed.

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沸石对氟化物的吸附能力及影响因素研究

在改性试验中，确定了最佳改性方法。首先，将天然沸石在马弗炉中以600℃的温度焙烧2h。冷却至常温后，在4% HCl溶液中65℃动态浸泡1小时，再在1mol/L NaOH溶液中40℃动态浸泡1小时。然后将预处理好的沸石在10%AlCl3溶液中，在40℃下动态浸泡20小时。最后，在水蒸气中处理1小时。为考察改性沸石的除氟能力，进行了静态实验。结果表明，改性后的沸石吸附量大大提高，对浓度为20mg/L的氟溶液吸附量达到0.25mg/g。影响改性沸石吸附性能的因素很多。其中，原水pH值、原水浓度和动态实验运行速度的影响较大。采用扫描电镜(SEM)、x射线衍射(XRD)和红外光谱(FT-IR)对天然沸石和改性沸石的结构进行了观察。在此基础上，进一步分析了改性的原因和效果。

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2010 International Conference on Challenges in Environmental Science and Computer Engineering

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