Abstract
This work demonstrates a simple approach for the efficient removal of tetracycline (TC) antibiotic from an aqueous solution. The in situ-adsorption removal method involved instant precipitation formation of mixed metal hydroxides (MMHs), which could immediately act as a sorbent for capturing TC from an aqueous solution, by employing layered double hydroxide (LDH) components including magnesium and aluminum ions in alkaline conditions. By using this approach, 100% removal of TC can be accomplished within 4 min under optimized conditions. The fast removal possibly resulted from an instantaneous adsorption of TC molecules onto the charged surface of MMHs via hydrogen bonding and electrostatically induced attraction. The results revealed that our removal technique was superior to the use of LDH as a sorbent in terms of both removal kinetics and efficiency. Moreover, the recovery of captured TC was tested under the influence of various common anions. It was found that 98% recovery could be simply achieved by using phosphate, possibly due to its highly charged density. Furthermore, this method was successful for efficient removal of TC in real environmental water samples.
Highlights
The contamination of antibiotics in environmental water is a global concern, as they are potentially toxic and harmful to both the ecosystem and human life [1]
This study presents an in situ method for removal of TC antibiotics from an aqueous solution by employing the layered double hydroxide (LDH) components to generate instantly formed mixed metal hydroxides (MMHs), which simultaneously act as a sorbent to capture TC molecules from an aqueous solution during their precipitation formation
The in situ-adsorption removal strategy was based on the usage of LDH components in order to generate the mixed metal hydroxides (MMHs), which can simultaneously capture the TC
Summary
The contamination of antibiotics in environmental water is a global concern, as they are potentially toxic and harmful to both the ecosystem and human life [1]. One of the most commonly found antibiotics is tetracycline (TC), widely used in a variety of animal livestocks in order to promote growth and kill bacteria [2]. It plays a significant role in human therapy. As a result of its misuse, TC is commonly released as an agricultural or community effluent into the environment [3,4]. The purification of wastewater by the removal of TC prior to release into environmental water is still necessary
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