F-,H2PO24-和SO242-离子与纤维吸附剂的离子交换作用
ION EXCHANGE REACTION OF F-,H2PO4- and SO42- ONTO FIBROUS SORBENT
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摘要: 电位滴定实验表明, 新型纤维吸附剂的主要酸碱官能基团为二胺的共轭酸(>NH+Cl- -R-NH2+Cl- -), 此二元酸的离解平衡常数的比值(Ka1:Ka2)大于104.对不同pH条件下氟、磷酸和硫酸溶液的形态分布及阴离子交换实验进一步表明, 在所研究的pH值范围内, F-, H2PO4- 和SO42-是主要的阴离子交换吸附形式, 并且可与纤维吸附剂中存在的Cl- 进行等物质量的交换反应.Abstract: In this paper,the potentiometric titration experiment is applied to investigate functionalgroups of the fibrous sorbent.It is showed that the conjugated acid of diamine(>NH+Cl--R-NH2+Cl--)is constributed to acid-base reaction onto sorbent interface,and the ratio of their dissociation equilibrium constants(Ka1∶Ka2)is above 104.By the analysis of F-,PO43- and SO42- speciation and ion exchange experiment,it is further indicated that F-,H2PO4- and SO42- ions are dominant speciations adsorbed on fibrous sorbent and ion exchange reaction occurs between F-,H2PO2-,SO42- and Cl- involved in the sorbent.
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Key words:
- fiber /
- sorbent /
- ion exchange /
- anion
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