| Comparative Study of Tetracycline Adsorption onto ZIF-8, ZIF-67, and Bimetallic Zn/Co ZIF |
| کد مقاله : 1549-IWWA |
| نویسندگان |
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زهرا حیدرشاهی، کارشناس تحقیق و توسعه کاشفان نیلفام * اصفهان، چرخاب، خیابان پاسداران |
| چکیده مقاله |
| Tetracycline (TC) is a widely detected pharmaceutical contaminant in aquatic environments, necessitating the development of efficient adsorbents for its removal from water. In this study, the effect of metal composition on TC adsorption was systematically investigated using Zn-based, Co-based, and bimetallic Zn/Co zeolitic imidazolate frameworks (ZIFs). ZIF-8, ZIF-67, and three bimetallic ZIFs with Zn/Co molar ratios of 80:20, 50:50, and 20:80 were synthesized and characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and field-emission scanning electron microscopy (FESEM). The adsorption results demonstrated a strong dependence of TC uptake on the Zn/Co composition. ZIF-67 exhibited the highest adsorption capacity of approximately 1450 mg g⁻¹, followed by Zn₀.₂Co₀.₈-ZIF (1330 mg g⁻¹), Zn₀.₅Co₀.₅-ZIF (1160 mg g⁻¹), Zn₀.₈Co₀.₂-ZIF (1050 mg g⁻¹), and ZIF-8 (980 mg g⁻¹). Adsorption kinetics showed rapid TC uptake during the initial stage, while equilibrium was reached within approximately 120–180 min. The pseudo-second-order model provided a better fit to the kinetic data, whereas the Langmuir model best described the adsorption equilibrium, suggesting predominantly monolayer adsorption on relatively homogeneous active sites. The enhanced adsorption of Co-rich ZIFs was attributed to stronger interactions between TC molecules and Co-containing active sites, together with hydrogen bonding and π–π interactions. Overall, the findings demonstrate that tuning the Zn/Co composition provides an effective strategy for controlling the adsorption performance of ZIF-based materials toward tetracycline. |
| کلیدواژه ها |
| Tetracycline; Zeolitic imidazolate framework (ZIF); ZIF-8; ZIF-67; Zn/Co bimetallic ZIF; Adsorption |
| وضعیت: پذیرفته شده برای ارسال فایل های ارائه پوستر |
