Interações entre corantes e argilas em suspensão aquosa

Química Nova

Miguel G. Neumann¹  Fergus Gessner¹  Ana P. P. Cione¹  Rogério A. Sartori¹  Carla C. Schmitt Cavalheiro¹ 

[1] ,Universidade de São Paulo Instituto de Química de São Carlos São Carlos SP

关键词: cationic dyes;    clays;    clay-dye interactions;   

DOI  :  10.1590/S0100-40422000000600016

来源: SciELO

【 摘 要 】

Adsorption of cationic dyes on clays can be used as a model for the interactions between organic compounds and these minerals. Cationic dyes like methylene blue are used to study these interactions because of the spectroscopic changes observed when their molecules are adsorbed on clay surfaces. Depending on the structure and layer charge of the clay particles several processes may occur, like adsorption of dye monomers and aggregates on the external and internal surfaces of the clay tactoids, migration towards internal surfaces, protonation, etc. Under certain conditions the deaggregation-aggregation of the clay particles are accelerated trapping dye species during these processes. A general scheme is proposed for the processes occurring between clays and dyes in aqueous suspensions, which can be used to explain the behaviour of specific systems.

【 授权许可】

CC BY-NC   
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