Spectrophotometric and electrokinetic studies of interaction of ciprofloxacin with humic substances and silica magnetite nanoparticles.
Artur Dzeranov,1 Lyubov Bondarenko,1 Gulzhian Dzhardimalieva,1,3 Elena Kelbysheva,4 Daniil Zmeev,2 Svetlana Patsaeva,2 Kamila Kydralieva,1 1 Moscow Aviation Institute (National Research University), Moscow, Russia 2 Physics Faculty, Lomonosov Moscow State University, Moscow, 119992, Russia 3 Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, Russia 4 Nesmeyanov Institute of Organoelement Compounds, RAS, Moscow region, Russia
Abstract
The ingress of antibiotics into wastewater is a common phenomenon that radically affects both the chemical and physical properties of natural water bodies and the ecosystem as a whole. Mesoporous silica nanoparticles are considered effective adsorbents for removing various contaminants due to their large surface area and regular channel structure, and those modified with magnetic nanoparticles are considered to be reusable due to their very high saturation magnetization. However, when assessing the sorption potential of the sorbent, it is necessary to take into account the presence of dissolved organic substances (DOM) contained in real conditions of use, which can compete with the antibiotic and occupy the adsorption centers of the sorbent. Thus, the present work is devoted to assessing the effect of dissolved organic matter, in particular humic acids (HA), on the interaction of ciprofloxacin (CIP) with a sorbent based on magnetite silica (MTA). It has been established that the obtained spectra of a multicomponent solution of CIP and HA are a superposition of the absorption peaks of each component, which indicates the absence of noticeable reactions occurring between the objects of study. The introduction of a sorbent into a multicomponent CIP system incubated with HA leads to a more than twofold increase in interaction with CIP. The results of electrokinetic measurements (zeta potential) confirmed the interaction mechanism in the CIP-HA-MTA system. In a three-component system, the MTA surface is completely recharged from negative to positive.
Speaker
Artur Dzeranov
Moscow Aviation Institute (National Research University), Moscow, Russia
Russia
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