Polyvinylidene fluoride (PVDF) hollow fibre membranes for ammonia removal from water
Polyvinylidene fluoride (PVDF) hollow fibre membranes for ammonia removal from water
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DOI：
10.1016/j.memsci.2005.06.057
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发表时间：
2006-03
影响因子：
9.5
通讯作者：
X. Tan;S. Tan;W. Teo;Kang Li
中科院分区：
文献类型：
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作者：
X. Tan;S. Tan;W. Teo;Kang Li
采用相转化法制备了具有非对称结构和良好疏水性的聚偏氟乙烯（PVDF）中空纤维膜，并将其应用于水中氨氮的去除。采用含硫酸的水溶液作为反萃液，加速氨的脱除。建立了PVDF中空纤维膜组件脱氨过程的数学模型。实验结果表明，乙醇后处理可提高PVDF中空纤维膜的疏水性和有效表面孔隙率，有利于氨的去除。提高水的pH值能够促进氨的去除。氨的初始浓度和酸反萃液的进料速度对氨的去除率影响不大。当进料速度达到0.59m/s或Re>0.32时，氨汽提速率随进料速度的增加而增加，当进料速度超过0.32时，氨汽提速率不再受进料速度的影响。所有的实验数据都与模拟结果非常吻合。
Polyvinylidene fluoride (PVDF) hollow fibre membranes with asymmetric structures and good hydrophobicity have been prepared by a phase-inversion method and have been applied to removal of ammonia from water. Aqueous solution containing sulfuric acid was used as stripping solution to accelerate the removal of ammonia. A mathematical model was presented to simulate the ammonia removal in PVDF hollow fibre modules. Experimental results indicate that the post-treatment with ethanol is useful to improve both the hydrophobility and the effective surface porosity of the resulting PVDF hollow fibre membranes, and thus favors the ammonia removal. Increasing the pH value of water is capable of promoting the removal of ammonia. The initial concentration of ammonia and the feed velocity of the acid stripping solution have negligible effects on the ammonia removal. The ammonia stripping rate increases as the feed velocity is increased up to 0.59m/s or Re>0.32, after which the feed velocity shows no effect. All the experimental data are in excellent agreement with the modeling results.