Synthesis of Porphyrin Zr-MOFs for the Adsorption and Photodegradation of Antibiotics under Visible Light

Abstract

The release of antibiotics into the water environment can pose a serious threat to human and ecological health, so it is of great significance to effectively remove antibiotics from wastewater. In this work, porphyrinic zirconium metal−organic framework material, PCN-224, was first explored for the adsorption removal of antibiotics from water using tetracycline (TC) and ciprofloxacin (CIP) as examples. We prepared a series of PCN-224 with different particle sizes (150 nm, 300 nm, 500 nm, and 6 μm). Benefiting from the huge surface area (1616 m 2 g −1 ), the 300 nm-PCN-224 sample had the best adsorption properties for TC and CIP. Remarkably, it exhibits fast removal rates and high adsorption capacities of 354.81 and 207.16 mg g −1 for TC and CIP, respectively. The adsorption of TC and CIP in 300 nm-PCN-224 is consistent with the pseudo-second-order kinetic model and Langmuir isotherm model, which indicates that the adsorption can be regarded as homogeneous monolayer chemisorption, and the adsorption is exothermic, which has been confirmed by thermodynamic studies. Under visible-light irradiation, 300 nm-PCN-224 exhibited high photocatalytic activity for TC and CIP. The adsorption studies confirmed that the adsorption of adsorbates takes place via the formation of hydrogen bonding, π−π interactions, and electrostatic attraction. In addition, the adsorbent can be simply regenerated by photocatalysis under visible light, and the adsorption−desorption efficiency is still above 85% after repeated use five times. The work of MOFs to remove antibiotics from water shows that MOFs have great potential in this field and are worthy of further study.

Design of nitrobenzene vapor sensor based on PCN-224

“…As shown in Figure 2a, PCN-224 shows crystalline diffraction peaks at 4.49, 6.39, 7.82, 9.16, 11.21, and 13.71°, which represent the crystal planes (002), (022), ( 222), (004), (224), and (006), respectively. These peaks correspond to those observed for reported PCN-224, demonstrating the successful synthesis of PCN-224 [19].…”

Porphyrin based metal–organic frameworks: highly sensitive materials for optical sensing of oxygen in gas phase

“…Photodegradation may be surprising at the first glance since Zr-based MOFs are often highlighted as materials with excellent photostabilities and stability against singlet oxygen which is generated during quenching of fluorescent and phosphorescent emitters. Numerous applications of PCN-224 which require efficient singlet oxygen production, such as photodynamic therapy, 34 photocatalytic degradation 64 or photodynamic sterilization 65 have been demonstrated. Photostability of PCN-224 MOF in liquid suspension was found to be excellent.…”

Ultrasensitive Fluorescence Platform Based on AgNPs In Situ-Incorporated Zr-MOFs for the Detection of Organophosphorus Pesticides

“…The sharp crystal diffraction peaks of as-synthesized PCN-224 at 6.52°, 7.96°, 9.18°, 11.23°, and 13.73°corresponded to the crystallographic planes with (022), ( 222), (004), (224), and (006), which were completely aligned with that of the standard CCDC file (CCDC: 1001133) and previously reported simulated PCN-224, without appearance of any additional peaks. 30 The chemical composition of PCN-224 was further investigated using FT-IR (Figure 3C). The peaks at 1414 and 1650 cm −1 were attributed to symmetric and asymmetric stretching vibrations of the COO − group.…”