Influence of particle size on fluoride removal by La2O3 . nH2O.
Influence of particle size on fluoride removal by La2O3 . nH2O.
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发表时间：
2009
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通讯作者：
W. Lili;Yang Hongwei;Zhu Wanpeng;Liang Zhenyu;L. Wen-jun
中科院分区：
文献类型：
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作者：
W. Lili;Yang Hongwei;Zhu Wanpeng;Liang Zhenyu;L. Wen-jun
【摘要】：研究了La_2O_3·nH_2O除氟的最佳pH范围,以及粒径对其除氟能力和动力学的影响,在此基础上,将La_2O_3·nH_2O与活性氧化铝的除氟能力进行了比较。实验结果表明:La_2O_3·nH_2O除氟的最佳pH范围为5.5~6.5;对氟的吸附实验结果表明,La_2O_3·nH_2O对La_2O_3·nH_2O的最大吸附量符合Langmuir单分子层吸附原理,并且随着粒径的减小,最大吸附量和吸附速率显着提高。实验中,0.038~0.050 mm尺寸的La_2O_3·nH_2O的最大吸附量是0.500~0.710 mm尺寸的3.32倍,当平衡氟浓度为1时mg/L,计算得出前一种粒径的吸附容量是后一种粒径的10.13倍。与活性氧化铝相比,当平衡氟化物浓度为1mg/L时,La_2O_3·nH_2O的吸附容量是同粒径活性氧化铝的2.55~13.88倍。
The best pH range for fluorine removal using La_2O_3·nH_2O,and the influence of particle size on its defluorination capacity and dynamics were studied in this paper.On this basis,the defluorination capacity of La_2O_3·nH_2O was compared with activated alumina.The experimental results showed that:the best pH range of fluorine removal using La_2O_3·nH_2O was 5.5-6.5;the adsorption of fluoride on La_2O_3·nH_2O accorded with the Langmuir single molecular layer adsorption principle;and,the maximum adsorption capacity and adsorption rate were significantly improved with the particle size decreasing.In these experiments,the maximum adsorption capacity of La_2O_3·nH_2O with size 0.038-0.050 mm was 3.32 times as much as that with size 0.500-0.710 mm,and when the balance fluoride concentration was 1 mg/L,the calculated adsorption capacity of the former size was 10.13 times as much as that of the latter size.Compared with activated alumina,when the balance fluoride concentration was 1 mg/L,the capacity of La_2O_3·nH_2O was 2.55-13.88 times as much as that of activated alumina with the same particle size.