Naslov (eng)

Regeneration of zeolite adsorbent by using non-equilibrium plasma

Autor

Škoro, N.
Kalebić, B.
Pavlović, Jelena
Dikić, J.
Rajić, N.

Opis (eng)

Abstract: Nowadays, all categories of fresh water, surface water, groundwater and atmospheric water, are exposed to various types of pollution. The most troublesome polluting compounds classified as persistent pollutants cannot be completely removed by using conventional water processing methods [1]. Antibiotics fall into this pollutant category due to their very stable molecule structures and a long-life persistence in the environment [2]. One of the effective approaches for treatment of water polluted by antibiotics is adsorption. Zeolite-based adsorbents have recently proved to have excellent performance in antibiotics removal [3]; together with their advantage of having a relatively simple design and cost effectiveness, they appear to be exceptional adsorbents for this purpose. However, the cost of the treatment process, apart from the cost of the adsorbent material, also depends on its recyclability. In case of zeolites, the adsorption of antibiotics was found to be irreversible preventing the reuse of the spent adsorbent material. In this study, the use of non-equilibrium plasma processing for regeneration of spent natural zeolite-clinoptilolite adsorbent was investigated in order to recover its adsorption properties. The antibiotic ciprofloxacin was used as a model persistent pollutant. Treatments of the spent clinoptilolite were performed in a surface dielectric barrier discharge operating in air. Highvoltage sine signal was supplied to the square-shaped segmented upper electrode separated by 2 mm from the lower electrode, which served as a sample holder. The simple geometry of the plasma source design allowed scaling up the device in order to study the effect of the electrode surface in the zeolite treatment. Recovery of the adsorption potential of up to 70% was achieved after 20 minutes of treatment in the first regeneration cycle. High recovery rates were also obtained in subsequent cycles showing that non-equilibrium plasma is a prospective method for recycling used adsorbent material.

Jezik

engleski

Datum

2021

Licenca

© All rights reserved

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Institut za zemljište