ZHOU Jing-biao,WANG Wen-dong,ZHANG Bo-xiang,et al.Adsorption Mechanism of Illite and Sodium Montmorillonite on Ethidium Bromide[J].China Water & Wastewater,2021,37(5 5):79-85.
Adsorption Mechanism of Illite and Sodium Montmorillonite on Ethidium Bromide
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
5 5
Page:
79-85
Column:
Date of publication:
2021-03-01
- Abstract:
- Clay minerals exhibit good adsorption properties due to their unique cation exchange capacity and are widely used in wastewater treatment. Ethidium bromide is a commonly used nucleic acid dye in molecular laboratories, and its strong mutagenicity can cause irreversible damage to the human body. Ethidium bromide was adsorbed by two different types of clays, which were 2 ∶1 type illite and 2 ∶1 type sodium montmorillonite, and the adsorption behavior and adsorption mechanism were explored. The adsorption process of illite and sodium montmorillonite on ethidium bromide was consistent with Langmuir isothermal adsorption model and pseudosecondorder kinetic equation, and their adsorption capacities were controlled by cation exchange capacity, which were 0.10 mmol/g and 1.09 mmol/g, respectively. It was further found that the adsorption of ethidium bromide on illite mainly occurred on the outer surface of the material, and the influence of H+ and Na+ on the adsorption site competition was significant. The adsorption of ethidium bromide on sodium montmorillonite occurred mainly in the interlayer spacing and was less affected by environmental pH and ionic competition, indicating that it had a high affinity with ethidium bromide. Therefore, clay minerals with different structures exhibited different adsorption behaviors.
Last Update:
2021-03-01