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首页> 外文期刊>Journal of Applied Polymer Science >Effect of adding other metal ions on the removal of Cd2+ by the CoAlPO4-5/polysulfone membrane
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Effect of adding other metal ions on the removal of Cd2+ by the CoAlPO4-5/polysulfone membrane

机译：添加其他金属离子对CoAlPO4-5 /聚砜膜去除Cd2 +的影响

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摘要

Based on our previous work, performance of separation of Cd2+ by the CoAlPO4-5/polysulfone membrane was not as good as that of the other metal ions. This could be significantly improved by the addition of other metal ions into the Cd2+ solution. The metal ions added were those with larger hydrated radius than that of Cd2+. When Mg2+ and Ca2+ were added, the rejection rate of Cd2+ could be increased from about 50% ([Cd2+] = 50 ppm) to nearly 100% and the rate would increase with concentration of Mg2- and Ca2+. However, when the added ions were Fe2+ and Mn2+, although the performance of Cd2+ removal was still high, the rejection rate would inversely decrease with increasing concentration of Fe2+ and Mn2+. These phenomena were mainly attributable to the effect of hydrated ion and the effect of lowered pH value induced by the hydrolysis of the solution. As to the addition of Al3+, although the rejection rate would decrease with increasing Al3+ concentration up to 100 ppm, an abrupt increase was observed at 150 ppm, which was thought to be attributable to the concentration polarization effect caused by the formation of the high valence [Al-n(OH)(m)]((3(supi]n-[supi]m)+) complex. (C) 2002 Wiley Periodicals, Inc. [References: 11]
机译：根据我们先前的工作，CoAlPO4-5 /聚砜膜分离Cd2 +的性能不如其他金属离子。通过将其他金属离子添加到Cd2 +溶液中，可以显着改善这一点。添加的金属离子是水合半径大于Cd2 +的那些。当添加Mg2 +和Ca2 +时，Cd2 +的排斥率可以从大约50％（[Cd2 +] = 50 ppm）增加到接近100％，并且随着Mg2-和Ca2 +的浓度增加。然而，当添加的离子为Fe2 +和Mn2 +时，尽管去除Cd2 +的性能仍然很高，但随着Fe2 +和Mn2 +浓度的增加，排斥率反而降低。这些现象主要归因于水合离子的作用和溶液水解引起的pH值降低的作用。关于Al 3+的添加，尽管随着Al 3+浓度的增加直至100ppm，拒绝率会降低，但是在150ppm处观察到突然增加，这被认为是由于高价态的形成而引起的浓度极化效应。 [Al-n（OH）（m）]（（3（n-n-sm）+）络合物。（C）2002 Wiley Periodicals，Inc. [参考：11]

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