Rapid Removal and Efficient Recovery of Tetracycline Antibiotics in Aqueous Solution Using Layered Double Hydroxide Components in an In Situ-Adsorption Process

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.

Layered Double Hydroxides

“…Along with heavy metal pollution, antibiotics increasingly pose a serious concern for environmental water. Panplado et al [5] demonstrated a simple strategy to very rapidly remove tetracycline (TC) antibiotic molecules from contaminated water. They propose an in-situ adsorption method which involves the utilization of Mg 2+ and Al 3+ containing LDH precursors to promote the precipitation of mixed metal hydroxides (MMHs), which act as fast sorbents for capturing TC from aqueous solution.…”

Fast Removal of Tetracycline from Aqueous Solution by Aluminosilicate Zeolite Nanoparticles with High Adsorption Capacity

“…According to previous studies, the adsorption of TC on many adsorbents involves a variety of interactions, such as hydrogen bonds, , surface complexation, , hydrophobic interactions, electrostatic interactions, , and π–π interactions. , The hydrophobic interaction is not the main motivating force for the adsorption of TC by the aluminosilicate zeolite because the zeolite was found to be hydrophilic with a contact angle of 76° (see Figure S2). In addition, the adsorption mechanism may not be π–π interaction because the aluminosilicate zeolite surface does not have a ring structure that promotes the π–π interaction with the ring structure of the TC molecule.…”

“…According to previous studies, the adsorption of TC on many adsorbents involves a variety of interactions, such as hydrogen bonds, 21,51 surface complexation, 48,49 hydrophobic interactions, 23 electrostatic interactions, 51,52 and π−π interactions. 23,52 The hydrophobic interaction is not the main motivating force for the adsorption of TC by the aluminosilicate zeolite because the zeolite was found to be hydrophilic with a contact angle of 76°(see Figure S2).…”

Progress in the removal of pharmaceutical compounds from aqueous solution using layered double hydroxides as adsorbents: A review

“…Real water samples coming from a dam, a river, three lakes and a wastewater plant were used by Panplado et al [34] when studying the adsorption capacity of calcined MgAl LDH, synthetized by the co-precipitation method with a 3:1 mol ratio, over TCY. The removal capacity of TCY was superior to 90 % in all cases.…”