Graphene oxide/zeolitic imidazolate framework-8 nanocomposite for lead ion removal

Adsorption for heavy metal removal is extensively explored due to its economical and straightforward nature. In this study, the nanocomposites of graphene oxide (GO)/zeolitic imidazolate framework-8 (ZIF-8) adsorbents were prepared as adsorbents, with the solvent utilized was reverse osmosis (RO) wa...

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Bibliographic Details
Published in:Materials today : proceedings 2023-05
Main Authors: Ahmad, Siti Zu Nurain, Salleh, Wan Norharyati Wan, Yusop, Mohd Zamri Mohd, Hamdan, Rafidah
Format: Article
Language:English
Subjects:
Graphene-based
Lead removal
Wastewater treatment
Weight percentage
Zeolite
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Summary:Adsorption for heavy metal removal is extensively explored due to its economical and straightforward nature. In this study, the nanocomposites of graphene oxide (GO)/zeolitic imidazolate framework-8 (ZIF-8) adsorbents were prepared as adsorbents, with the solvent utilized was reverse osmosis (RO) water for a greener approach. Also, the synthesis was performed using the room temperature synthesis method which required less energy consumption. 10, 30, and 50 wt% GO were utilized to produce ZIF-8/GO composites of ZG1, ZG3, and ZG5, respectively. Based on the field emission scanning electron microscopy (FESEM) images, the adsorbents consisted of cubic and rhombic dodecahedron shapes of ZIF-8 grown on top and in between the layers of GO sheets. This inhibits the agglomeration nature of GO which increased the number of active sites, thus improving the lead ions adsorption capacity. From the batch tests conducted, ZG3 showed the greatest adsorption capacity of lead solution, followed by ZG5, ZG1, ZIF-8, and GO. The optimum conditions for adsorption using ZG3 were using the initial amount of lead solution of 20–100 mg/L at pH 5 to 6, and the sorbent dosage used was 10 mg. The equilibrium time obtained for lead adsorption was short, within 10 min for both ZG3 and ZG5. On the other hand, ZG1 reached equilibrium within 180, ZIF-8 within 240 min, and the longest time was GO, within 300 min. Therefore, ZG3 demonstrates a good potential as heavy metal adsorbent in wastewater treatment technology with ease of synthesis, sufficient amount of GO used, less dosage required, and shorter contact time needed.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2023.04.442