Synthesis of zeolitic imidazolate framework‐8 modified graphene oxide composite and its application for lead removal

Abstract

BACKGROUNDThe removal of lead ions (Pb2+) from industrial wastewater can be achieved using adsorption technology. Composites of zeolitic imidazolate framework‐8 (ZIF‐8) and graphene oxide (GO) were prepared via room temperature synthesis (RTS) using RO water as the solvent and by mixing GO with separated parts of ZIF‐8 precursors before its combination. Three weight percentages of GO, 10wt%, 30wt% and 50wt%, were used to synthesize ZGH10, ZGH30 and ZGH50 to determine optimum preparation and application conditions.ResultsZGH30 showed the most outstanding performance as an adsorbent for Pb2+ removal from aqueous solution. As captured by field emission scanning electron microscopy image, ZGH30 showed an adequate amount of ZIF‐8 grown on all surfaces of thr GO sheet, with an appropriate exposure of GO sheet layers for further Pb2+ interaction. The Pb2+ adsorption test revealed that ZGH30 obtained the optimum operating values between pH 5 and 6, using 10 mg dosage and it could remove ≤97% of 100 mg L−1 Pb2+. Additionally, ZGH30 achieved the most rapid equilibrium time within 10 min, similar to ZGH50, as compared to their individual components, ZIF‐8 (240 min) and GO (300 min). The mechanism of Pb2+ adsorption fitted well with a Langmuir isotherm and pseudo‐second‐order kinetic model. The theoretical maximum adsorption capacities obtained through Langmuir isotherm were 200, 454.55, 476.19, 555.56 and 454.55 mg g−1, for GO, ZH, ZGH10, ZGH30 and ZGH50, respectively.ConclusionsTherefore, ZGH30 hybrid successfully unleashed its potential as the adsorbent for wastewater treatment technology with improved performance after modification. © 2023 Society of Chemical Industry (SCI).

Special issue: 6th International Conference of Chemical Engineering & Industrial Biotechnology 2022 (ICCEIB 2022)

“…The optimized ZnFe 2 O 4 @AC demonstrated high adsorption capacities for various dyes, making it a recommended bioadsorbent for the removal of cationic, anionic, and neutral dyes from water. In addition to organic dyes, Ahmad et al 5 undertook research on the application of zeolitic imidazolate framework-8 (ZIF-8) and graphene oxide (GO) composites in the removal of lead ions (Pb 2+ ) from industrial wastewater. Among the examined composites, ZGH30, which contained 30 wt% GO, exhibited remarkable adsorption performance, achieving a rapid equilibrium within 10 min and a maximum adsorption capacity of 476.19 mg/g.…”

“…The optimized ZnFe 2 O 4 @AC demonstrated high adsorption capacities for various dyes, making it a recommended bioadsorbent for the removal of cationic, anionic, and neutral dyes from water. In addition to organic dyes, Ahmad et al 5 . undertook research on the application of zeolitic imidazolate framework‐8 (ZIF‐8) and graphene oxide (GO) composites in the removal of lead ions (Pb 2+ ) from industrial wastewater.…”

N-Doped Graphene (N-G)/MOF(ZIF-8)-Based/Derived Materials for Electrochemical Energy Applications: Synthesis, Characteristics, and Functionality

“…In addition to their applications in energy systems, graphene/MOF-based materials have garnered significant interest for a wide range of uses, including chemical sensors [83][84][85][86][87][88][89][90], biosensors [91][92][93], water purification [94][95][96][97], gas separation and storage [98][99][100][101][102][103], and medical therapy [104,105], among others. With their impressive performances in various applications, researchers are increasingly keen to comprehensively understand the synthesis, characteristics, and functionalities of these materials.…”