Defluorination Behavior of Modified Nano-Bentonite in Zinc Sulfate Solution
Defluorination Behavior of Modified Nano-Bentonite in Zinc Sulfate Solution
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改性纳米膨润土在硫酸锌溶液中的脱氟行为
DOI：
10.1166/nnl.2017.2431
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发表时间：
2017
影响因子：
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通讯作者：
Kong Hailin
中科院分区：
文献类型：
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作者：
Fang Zhao;Peng Jiaxin;Liu Wende;Zhang Zhaohui;Li Linbo;Li Xiaoming;Cui Yaru;Xue Ning;Guo Weichang;Kong Hailin
采用改性纳米膨润土对硫酸锌溶液中的氟进行了处理实验研究。以纳米膨润土为吸附剂，采用硝酸镧对膨润土进行改性。研究了改性纳米膨润土、吸附时间、温度和pH对除氟效果的影响。采用扫描电镜（SEM）、能谱分析（EDAX）和傅里叶变换红外光谱（FTIR）对改性前后的吸附剂进行表征。结果表明，改性纳米膨润土加入量为10 g/L，吸附时间为15 min，温度为40 °C，pH值为5时，氟浓度由100 mg/L降至45.64 mg/L，符合工业生产中氟浓度小于50 mg/L的规定。多种分析手段表明，改性后纳米膨润土表面镧元素的有效负载量增加，包括纳米膨润土的层间距和比表面积，从而大大提高了纳米膨润土的除氟性能。
An experimental study on treatment of fluoride in zinc sulfate solution by modified nano-bentonite was carried out in this study. Nano-Bentonite was used as an adsorbent and modified with lanthanum nitrate. The influences of modified nano-bentonite, adsorption time, temperature and pH on removal of fluoride were also studied. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and Fourier-transform infrared spectromxetry (FTIR) were used to characterize the adsorbent before and after modification. Results showed that the concentration of fluorine dropped from 100 mg/L to 45.64 mg/L, which conformed to the provisions by industrial production of less than 50 mg/L when modified nano-bentonite being added is 10 g/L, Adsorption time being 15 min, at 40 °C and pH 5. Variety of analytical tools showed that the lanthanum element payload on the surface of the nano-bentonite after the modification increased at the same time, including the interlayer spacing of nano-bentonite and specific surface area, thereby improving the fluoride removal performance of nano-bentonite greatly.