Adsorption of Dyes Using Graphene Oxide-Based Nano-Adsorbent: A Review

Abstract

Graphene Oxide (GO) based adsorbents have attracted much attention from researchers because there have been many reports that they are effective for removing dyes from aqueous environments. That is because GO has good mechanical, electrical, optical and chemical properties, so graphene and its derivatives, such as graphene oxide, have been used in various applications in the field of environmental management. Modifying GO into nano size is an effort to improve its performance in removing dyes. This review uses a database from Science Direct, Google Scholar and Springer, which was screened using graphene oxide, pigments, adsorption and nano adsorbent. The performance of the nano adsorbent showed quite good results in the removal of dyes. The isotherm model suitable for adsorption varies between Langmuir, Freundlich and Redlich-Peterson isotherms. Pseudo-second-order (PSO) is the best model to explain the adsorption process kinetics. Nano-adsorbent modification can be reused at least five times with a reduced adsorption capacity of 4-8%. Studies related to adsorption with GO-based nano adsorbents show promising results in pollutant removal. Still, aspects such as synthesis method, surface functional groups interaction and dye ions and the stability of synthesis products need to be investigated further.

Adsorption of Crystal Violet with Magnetic Graphene Oxide Nano Adsorbent Synthesized from <i>Schima wallichii</i> Wood

“…The value of the determination coefficient (R 2 ) of the PSO is known to be higher than PFO. Furthermore, the value of the adsorption capacity calculated by the PSO [32].…”

Study on the Dye Removal from Aqueous Solutions by Graphene-Based Adsorbents

“…This material possesses a specific two-dimensional atomic crystal structure, comprising a single layer of closely packed sp 2 -bonded carbon atoms arranged in a honeycomb lattice. Graphene oxide contains various types of functional groups on its surface (carboxyl, carbonyl, alkoxy, epoxide hydroxyl, and other oxygen-based functional groups) [25][26][27][28]. These oxygen-containing groups are responsible for the possibility of the surface functionalization of GO, which provides many opportunities for utilizing graphene oxide as a precursor in the synthesis of diverse nanocomposite materials.…”

“…The mechanisms of adsorption have been identified as hydrogen bonding, electrostatic forces, π-π stacking, van der Waals forces, etc. [27,28]. Additionally, they act as weak acid cation exchange sites.…”

“…Additionally, they act as weak acid cation exchange sites. Therefore, these materials have been widely reported as excellent adsorbents for the removal of diverse pollutants, including dyes, heavy metal ions, and radioactive substances [5,[27][28][29][30][31][32]. Over the last decade, a variety of graphene-based materials, such as GO, RGO, and composite GO materials, have been effectively applied in the removal of methylene blue dye [1,2,5,7,9,27,28,[33][34][35][36][37][38][39][40].…”