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Efficiency of magnetic zeolitic imidazolate framework-8 (ZIF-8) modified graphene oxide for lead adsorption

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Abstract

Simple and efficient removal of Pb(II) ion from aqueous solution through adsorption has accelerated the development of many new composites to improve this popular method. In this study, the composites of graphene oxide (GO), zeolitic imidazolate framework-8 (ZIF-8), and magnetic materials were synthesized via coprecipitation method utilizing a different molar ratio between FeCl2 and FeCl3 of 1:0.5, 2:1, 3:1.5, and 4:2. The ZIF-8/GO was prepared via room temperature synthesis method prior to its further modification with magnetic materials for ease of separation. It was observed that the MZIF-8/GO2 of molar ratio 2:1 showed the best performance in adsorbing Pb(II) ion. As confirmed by FESEM image, it appeared to be ZIF-8 particles that have grown all over the GO platform and overlayed with Fe3O4 granular-shaped particles. The MZIF-8/GO2 successfully achieved 99% removal of Pb(II) within 10 min. The optimum values obtained for the initial concentration of Pb (II) were 100 mg/L, pH of 4 to 6, and adsorbent dosage used was 10 mg. The Langmuir isotherm and the pseudo-second-order kinetic model were deemed suitable to evaluate the adsorption of Pb(II) using MZIF-8/GO2. Results showed that MZIF-8GO2 achieved a maximum adsorption capacity of 625 mg/g of Pb(II) adsorption. All parent materials demonstrated a good synergistic effects, while exhibiting a significant contribution in providing active sites for Pb(II) adsorption. Therefore, this ternary composite of MZIF-8/GO2 is expected to be a promising adsorbent for Pb(II) adsorption from aqueous solution with an added value of ease of post phase separation using external magnetic field.

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The data that support the findings of this study are available, upon reasonable request.

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Funding

This work was supported by the Universiti Teknologi Malaysia under UTM Encouragement Research (project number Q.J130000.3846.31J70).

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All authors contributed to the conceptualization. Material preparation, data collection, analysis, and original draft were performed by Siti Zu Nurain Ahmad. All authors commented on the previous versions of manuscript. Equipment and material resources were provided by Wan Norharyati Wan Salleh, Norhaniza Yusof, Mohd Zamri Mohd Yusop, and Rafidah Hamdan. Funding was acquired by Wan Norharyati Wan Salleh and Ahmad Fauzi Ismail. All authors read and approved the final manuscript.

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Correspondence to Wan Norharyati Wan Salleh.

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Zu Nurain Ahmad, S., Salleh, W.N.W., Yusof, N. et al. Efficiency of magnetic zeolitic imidazolate framework-8 (ZIF-8) modified graphene oxide for lead adsorption. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33322-w

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  • DOI: https://doi.org/10.1007/s11356-024-33322-w

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