Metal-Organic Framework-101 (MIL-101): Synthesis, Kinetics, Thermodynamics, and Equilibrium Isotherms of Remazol Deep Black RGB Adsorption

Abstract

In the present paper, the synthesis of metal-organic framework-101 (MIL-101) and Remazol Deep Black RGB (RDB) adsorption on MIL-101 were demonstrated. The kinetics of RDB adsorption on MIL-101 was studied using Weber’s intraparticle diffusion model and the pseudo-first- and pseudo-second-order kinetic models. Particularly, the statistical method of piecewise linear regression and multi-nonlinear regression was employed to analyse the adsorption data according to the previously mentioned kinetic models. The results indicated that the adsorption process followed the three-step pseudo-first-order kinetic equation, which was consistent with the results of the intraparticle diffusion model with three linear segments. This model best described the experimental data. In addition, the adsorption isotherm data were studied using five adsorption models, namely, Langmuir, Freundlich, Redlich–Peterson, Toth, and Sips in nonlinear forms, and the Langmuir model is the most appropriate for the experimental data. The values of energies of activation of adsorption were calculated, and they revealed that the adsorption process was of endothermic chemical nature. A statistical comparison using Akaike information criterion to estimate the goodness of fit of the kinetic and isotherm models was presented.

Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters

“…The ζ potential of Cr-MOF was observed to decrease with increasing pH from 2 to 10 (Figure a)). The positive charge of Cr-MOF at pH = 5 was due to the unsaturated chromium ions present in the MOF . The point of zero charge (pH zcp ) for Cr-MOF was observed at pH 7.5, similar to what was found in the literature .…”

“…The positive charge of Cr-MOF at pH = 5 was due to the unsaturated chromium ions present in the MOF. 59 The point of zero charge (pH zcp ) for Cr-MOF was observed at pH 7.5, similar to what was found in the literature. 60 The ζ potential of PSNPs decreased with increasing pH (Figure 3b1,c1).…”

A Comprehensive Review on Adsorption, Photocatalytic and Chemical Degradation of Dyes and Nitro-Compounds over Different Kinds of Porous and Composite Materials

“…If the material is porous, the diffusion will be fast, and the adsorption will reach its equilibrium in a short time compared to non-porous material, as discussed in detail in the above paragraphs. Agitation speed is also responsible for the increased adsorption of dyes because it facilitates the fast diffusion of molecules in dense materials and will ultimately increase the adsorption efficiency [ 150 ]. In contrast, a few materials are already highly porous, such as cryogels, in which there is no need for agitation because their absorption capacity is rapid at approximately 60–120 s, which is suitable for fast diffusion and more adsorption; from the above factors, it is quite clear that adsorption phenomena are highly responsible for different conditions [ 48 ].…”

Study on the adsorption of methylene blue from aqueous solution using hydrogel glucomannan/graphene oxide

“…Graphene oxide được tổng hợp từ bột graphite bằng phương pháp Hummer cải tiến [13]. Oxi hóa 1.5 g bột graphite bằng hỗn hợp oxi hóa gồm H2SO4 98% : H3PO4 85% (180 : 20 mL) và 9 g KMnO4.…”