Graphene oxide nanosheets immobilised on honeycomb pore structure of pomelo peel for enhanced removal of methylene blue

rGO/ZIF-8 Aerogel for Effective Removal of Malachite Green from Wastewater

“…The main adsorption mechanism of ZDGA8 for MG can be summarized as follows: first, owing to the negative charge on the surface of graphene oxide (GO), it exhibits a high adsorption affinity with the cationic dye MG through electrostatic interactions. , Second, the ZDGA8 aerogel has a three-dimensional interconnected honeycomb pore structure, which allows MG molecules to freely diffuse inside the aerogel and adsorb by pore filling . In addition, the polydopamine (PDA)-modified graphene aerogel is enriched with abundant –OH and –COOH groups, which provide a large number of negative adsorption sites for MG adsorption .…”

“…15,16 Second, the ZDGA8 aerogel has a three-dimensional interconnected honeycomb pore structure, which allows MG molecules to freely diffuse inside the aerogel and adsorb by pore filling. 12 In addition, the polydopamine (PDA)-modified graphene aerogel is enriched with abundant −OH and −COOH groups, which provide a large number of negative adsorption sites for MG adsorption. 49 Moreover, the π−π interactions between the aromatic skeleton of the MG molecule and the aromatic ring of PDA significantly enhance the adsorption of the dye molecules.…”

“…10 The selection of the adsorbent material and its preparation process significantly influence the cost, benefits, and effectiveness of adsorption. 11,12 Consequently, the development and enhancement of adsorbents are of paramount importance in environmental remediation.…”

“…Among these methods, adsorption has emerged as a widely applied method in water treatment due to its simplicity, efficiency, economic viability, and recyclability . The selection of the adsorbent material and its preparation process significantly influence the cost, benefits, and effectiveness of adsorption. , Consequently, the development and enhancement of adsorbents are of paramount importance in environmental remediation.…”

“…However, the lamellae of powdered graphene tend to agglomerate due to π–π stacking, reducing the actual specific surface area . Graphene oxide (GO) is a graphene derivative containing abundant oxygen-containing functional groups such as epoxy, hydroxyl, and carboxyl groups, enabling GO to strongly interact with dyes and to be well dispersible in water,. ,, Particularly, these oxygen-containing functional groups allow GO to attract organic dyes through electrostatic interaction. Furthermore, the internal aromatic ring of GO interacts with aromatic organic contaminants through π–π stacking .…”