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首页> 外文期刊>Journal of Applied Polymer Science >Absorption and Desorption of Chromium Ions by Poly (acrylic acid) Gels
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Absorption and Desorption of Chromium Ions by Poly (acrylic acid) Gels

机译：聚（丙烯酸）凝胶对铬离子的吸收和解吸

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摘要

Theability of crosslinked poly (acrylic acid) gles to retain chromium species was studied as a function of pH. Chromium retention was found to increase with pH according to two mechanisms. In the low pH range where chromium species are soluble, retention occurs via ion-binding in the whole volume of the gel. At higher pH where insoluble chromium hydroxide particles are formed, retention comes from an adsorption process at the surface of the gel. The desorption of chromium species under acidic conditions was also investigated and found to be very dependent on retention mechanism and aging time of the polymer-chromium complex. When retention occurs by ion-binding, only partial desorption was achieved at very short aging time. In contrast, a very fast desorption was observed when retention occurs via adsorption at the surface of the polymer gel.
机译：研究了交联的聚（丙烯酸）胶保留铬的能力与pH的关系。发现铬的保留根据两个机理随着pH的增加而增加。在铬物质可溶的低pH范围内，通过离子结合在凝胶的整个体积中发生保留。在形成不溶的氢氧化铬颗粒的较高pH值下，保留来自凝胶表面的吸附过程。还研究了酸性条件下铬物质的解吸，并发现其非常取决于聚合物-铬络合物的保留机理和老化时间。当通过离子结合发生保留时，在非常短的老化时间内仅实现部分解吸。相反，当通过在聚合物凝胶表面上的吸附发生保留时，观察到非常快速的解吸。

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