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[求助] 【吸附】关于杯芳烃类物质对碱金属阳离子和重铬酸根阴离子吸附的问题

各位虫友,发文章遇到一个问题,杯芳烃类物质对重铬酸根有良好的吸附作用,对Na+,K+等碱金属阳离子也有非常好的吸附作用。那么在对重铬酸钠或者重铬酸钾等物质的溶液中,杯芳烃类物质对碱金属阳离子和重铬酸根均能进行吸附,对二者的两个吸附过程有没有必然的联系?比如,吸附碱金属阳离子对重铬酸根吸附有帮助?或者溶液中由于失去了阳离子,阴离子会有更大几率被杯芳烃所吸附?

附件论文中有这样一段话:
it is well known that the calixarenes with amide functionalities are effective sorbents for sodium cation. Therefore to comprehend the sorption abilities of C[4]BCP toward sodium cation, it was performed sodium sorption studies under similar conditions. The results show that C[4]BCP is excellent sorbent for sodium cation. Thus, the sorption of dichromate anions simultaneously occurred with sodium cation by C[4]BCP. This result indicated that C[4]BCP was a ditopic sorbent.
请大神帮忙讲解一下,这个同时发生的两种吸附,有没有联系?
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