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Abatement of heavy metals and softening of hard water by the CoAlPO4-5/polysulfone membrane

Authors

  • Shiow-Shyung Lin,

    Corresponding author
    1. Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
    • Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
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  • Shih-Hsiung Chen,

    1. Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
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  • Chia-Yan Chang,

    1. Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
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  • Dong-Jang Chang,

    1. Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
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  • Chia-Chrn Chen

    1. Department of Environmental Engineering and Health, Chia-Nan College of Pharmacy and Science, Tainan, 717, Taiwan, Republic of China
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Abstract

To improve the membrane, if CoAlPO4-5 was appropriately added, it could increase the rejection rate of metal ions compared with the PSf membrane. Besides, penetration rate would also increase, and the pressure applied could be lowered when the improved membrane was used. The optimum amount of CoAlPO4-5 added for Co : Al : P = 0.1 : 0.92 : 1.0 is about 5 wt %, while for the Co : Al : P = 0.08 : 0.93 : 1.0, this optimum value would shift toward a higher wt % because the latter has less active sites per unit weight of CoAlPO4-5. The hydrated radius of metal ion had great influence on the rejection rate. The larger the radius, for example, that of the +3 valence cations, the higher the rejection rate would exhibit, and the rate for Cd2+ was much lower because its radius was the smallest one. Moreover, although incompatibility existed in the improved membrane and the variation of applied pressure was limited, durability of this membrane under the operating conditions was good. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2768–2773, 2001

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