Abstract
Adsorption is an effective method to remove tetracycline (TC) from water, and developing efficient and environment-friendly adsorbents is an interesting topic. Herein, a series of novel phenyl porous organic polymers (P-POPs), synthesized by one-pot polymerization of different ratios of biphenyl and triphenylbenzene under AlCl3 catalysis in CH2Cl2, was studied as a highly efficient adsorbent to removal of TC in water. Notably, the obtained POPs possessed abundant phenyl-containing functional groups, large specific surface area (1098 m2/g) with abundant microporous structure, high pore volume (0.579 cm3/g), favoring the removal of TC molecules. The maximum adsorption capacity (fitted by the Sips model) could achieve 581 mg/g, and the adsorption equilibrium is completed quickly within 1 h while obtaining excellent removal efficiency (98%). The TC adsorption process obeyed pseudo-second-order kinetics and fitted the Sips adsorption model well. Moreover, the adsorption of POPs to TC exhibited a wide range of pH (2–10) adaptability and outstanding reusability, which could be reused at least 5 times without significant changes in structure and efficiency. These results lay a theoretical foundation for the application of porous organic polymer adsorbents in antibiotic wastewater treatment.
Highlights
The soaring usage of antibiotics in recent years has resulted in their widespread presence in water [1]
The existing adsorption materials used for the removal of TC include: clay [22], graphene oxide [23], activated carbon [24], metal organic framework compounds [25], and so on [26,27]
The adsorption equilibrium in this process could be reached within 1 h and the maximum adsorption capacity of the material was as high as 909.09 mg/g, the addition of organic solvents to adjust the dispersibility of the adsorbent in water and the environmental risk of heavy metals to aquatic plants remains a challenge
Summary
The soaring usage of antibiotics in recent years has resulted in their widespread presence in water [1]. The research on adsorbent-based porous organic polymers (POPs) has come to prominence because of their unique adsorption properties for antibiotics in water. The adsorption equilibrium in this process could be reached within 1 h and the maximum adsorption capacity of the material was as high as 909.09 mg/g, the addition of organic solvents to adjust the dispersibility of the adsorbent in water and the environmental risk of heavy metals to aquatic plants remains a challenge. The optimized P-POPs was possessed high TC adsorption amount of 581 mg/g, fast adsorption kinetics (about 1 h of adsorption equilibrium time), wide range of pH adaptability (no significant difference in TC adsorption capacity in pH 2–10 range), excellent recyclability (be reused at least 5 times without significant changes in their structure), good dispersion performance in aqueous solutions and no need for organic solvents. This work is significant to the exploration of new adsorbents, and provides certain theoretical support for the adsorption of porous organic polymers (POPs) to eliminate antibiotic pollution
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