Adsorption of azo dyes from aqueous solution by the hybrid MOFs/GO

Abstract

In this work, a hybrid of chromium(III) terephthalate metal organic framework (MIL-101) and graphene oxide (GO) was synthesized and its performance in the removal of azo dyes (Amaranth, Sunset Yellow, and Carmine) from water was evaluated. The adsorption for azo dyes on MIL-101/GO was compared with that of MIL-101, and it was found that the addition of GO enhanced the stability of MIL-101 in water and increased the adsorption capacity. The maximum adsorption capacities of MIL-101/GO were 111.01 mg g(-1) for Amaranth, 81.28 mg g(-1) for Sunset Yellow, and 77.61 mg g(-1) for Carmine. The adsorption isotherms and kinetics were investigated, showing that the adsorption fits the Freundlich isotherm and the pseudo-second-order kinetic model. The recyclability of MIL-101/GO was shown by the regeneration by acetone. The high adsorption capability and excellent reusability make MIL-101/GO a competent adsorbent for the removal dyes from aqueous solution.

Emerging adsorptive removal of azo dye by metal–organic frameworks

“…In order to solve the problem, they loaded graphene oxide (GO), an excellent hydrophilic agent, into the MIL-101 structure to enhance the hydrophilicity of MIL-101. Interestingly, the synthesized hybrid MIL-101/GO adsorbent showed constant adsorption capacity for all three azo dyes after five recycling rounds (Li et al, 2016b).…”

“…Regeneration of MIL-101 (Cr) in the presence of four solvents, methanol, ethanol, glycol and acetone, was investigated very recently by Li et al (Li et al, 2016b. After adsorption of various azodyes such as amaranth, sunset yellow and carmine, re-activation of MIL-101 using acetone solvent revealed the highest regeneration efficiency.…”

Carboxymethylcellulose/MOF-5/Graphene oxide bio-nanocomposite as antibacterial drug nanocarrier agent

“…22 Moreover, the critical drawbacks of MOFs and GO may resolve by the composition of GO and MOFs. 23 Recently, some new results about MOF–GO hybrids 24 have reported using various MOFs, for example, Zn-based MOF (MOF-5), 22 Cu-based MOF (HKUST-1 or Cu 3 (BTC) 2 , BTC = 1,3,5-benzene tricarboxylate), 25 Zr-based MOF (UiO-66) 26 and Fe-based MOF (MIL-100). 27 However, as far as we know, there are still few studies on the potential of the MOF-GO composites in the drug delivery systems, so evaluation of this system has a good novelty for controlling the drug release.…”

Role of pH in the Aqueous Phase Reactivity of Zerovalent Iron Nanoparticles with Acid Orange 7, a Model Molecule of Azo Dyes

“…Their removal from water streams is therefore a major environmental concern, since azo dyes are harmful both to humans and to the aquatic life [1,7]. Being recalcitrant to natural degradation, several technologies have been developed for remediation of both streams and wastewaters, including photocatalytic degradation [6,[8][9][10][11], advanced oxidation processes [12][13][14][15][16][17][18], adsorption [19][20][21][22][23], ion flotation [24], and sedimentation [25]. Unfortunately, physicochemical treatments are often expensive, and biological approaches are typically slow and poorly efficient [26][27][28].…”