Abstract
This study provides a novel composite as an efficient adsorbent of cationic methylene blue dye. UiO-66/MIL-101(Fe) binary metal organic framework (MOF) was fabricated using a solvothermal technique. Additionally, the developed binary MOF was modified with carboxylated graphene oxide (GOCOOH) using a post-synthetic technique. The as-fabricated UiO-66/MIL-101(Fe)-GOCOOH composite was analyzed by FTIR, XRD, SEM, BET, TGA, XPS and zeta potential analysis. The adsorption performance of UiO-66/MIL-101(Fe)-GOCOOH composite was examined for its aptitude to adsorb cationic MB dye using a batch technique. The obtained data revealed that, the developed UiO-66/MIL-101(Fe)-GOCOOH composite exhibited higher adsorption capacity compared to UiO-66/MIL-101(Fe) binary MOF. Adsorption isotherms and kinetic studies revealed that MB dye adsorption onto UiO-66/MIL-101(Fe)-GOCOOH composite fitted a Langmuir isotherm model (qm = 448.71 mg g−1) and both pseudo 1st order and pseudo 2nd order kinetic models. An intra-particle diffusion model showed that the adsorption process occurs through three steps. Besides, thermodynamic data reflected that the adsorption of MB onto UiO-66/MIL-101(Fe)-GOCOOH composite is an endothermic and spontaneous process and the adsorption involves both physisorption and chemisorption interactions. The as-fabricated UiO-66/MIL-101(Fe)-GOCOOH composite exhibited good reusability and can be considered as a promising reusable adsorbent for the treatment of dye-containing industrial effluents with high efficiency.
Highlights
A dye is an organic compound constructed from two main components; a chromophore that is responsible for producing the color and an auxochrome that increases the water solubility.[1,2] Undoubtedly, dyes are a double-edged sword, since they are essential for important industries such as textiles, pharmaceuticals, plastics, polymers, re neries, and leather.[3,4] the released effluents from these dye-containing industries cause signi cant hazards to human health and the aquatic environment
The adsorption behavior of the synthesized UiO-66/MIL101(Fe)-GOCOOH composite was evaluated via adsorption of methylene blue (MB) dye as a model of cationic dyes
Upon incorporation of GOCOOH into UiO-66/MIL-101(Fe) binary metal organic framework (MOF), all peaks intensities decreased with the appearance of a new peak at 1060 cmÀ1 which is corresponding to C–H of GOCOOH (Fig. 2D)
Summary
MOF has been frequently utilized for many applications including gas storage,[24] catalysis,[25] sensing[26] and adsorption.[27]. 35) have been developed to overcome the limitations of MOFs. Graphene oxide (GO), the oxidation product of graphene, contains numbers of oxygen-functional groups including hydroxyls, epoxides, carboxyls and carbonyls which signi cantly improve the chemical reactivity of GO compared to the raw graphene.[36] GO has gained great concern due to its features such as large speci c surface area, good mechanical characteristics, easy functionalization and its high adsorption capacity for dyes and heavy metals.[37] Further, GO structure has been modi ed via functionalization processes which resulting in well-dispersion and high stability in aqueous solution in order to enhances its adsorption propertied and widen its applications range.[14,38] For example, adsorption properties of MIL101(Fe) greatly enhanced a er its modi cation with GO.[39]. Isotherms, kinetics and thermodynamics of the process and reusability of UiO-66/MIL-101(Fe)-GOCOOH composite were evaluated
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