Adsorption potentials of iron-based metal–organic framework for methyl orange removal: batch and fixed-bed column studies

Abstract

In the present work, continuous ixed-bed column and batch studies were undertaken to investigate the eiciency of ironbased metal-organic framework (Fe-BTC) for the removal of methyl orange as a model contaminant from aqueous solutions. The batch experiments were carried out by varying operational parameters such as adsorbent dosage, pH, temperature, and initial contaminant concentration. The results showed that Fe-BTC had a high removal eiciency under a wide pH range. The equilibrium data were best itted by the Langmuir model with a maximum adsorption capacity of 100.3 mg g −1 at 298 K. In order to assess the industrial feasibility of Fe-BTC, ixed-bed column studies were conducted to obtain breakthrough curves, breakthrough and saturation times, and maximum uptakes at diferent bed heights. The breakthrough time was 20.0 and 46.2 h at 0.75 and 1.5 cm bed depths, respectively. The bed removal eiciency was 35.2 and 46.7% at 0.75 and 1.5 cm bed depth, respectively. The bed maximum adsorption capacity was 20.2 and 21.6 mg/g at 0.75 and 1.5 cm bed depths, respectively. Moreover, the application of empirical breakthrough curve models showed good agreement with the modiied dose response model (R 2 > 0.99). Also, the analytical solution of the advection-dispersion-adsorption mass transfer equation showed an excellent it to the experimental breakthrough data (R 2 > 0.99). Further, the analytical model was utilized to predict the length of the mass transfer zone as a function of the bed depth and to construct a 3D surface plot that can be utilized to predict the breakthrough at diferent bed depths.

Bimetallic Fe/Al-MOF for the Adsorptive Removal of Multiple Dyes: Optimization and Modeling of Batch and Hybrid Adsorbent-river Sand Column Study

“…The breakthrough time decreased with increasing concentration, and at higher concentration a sharp rise, and at lower concentration a flattened rise in the BTC was observed. The saturation on active sites on the adsorbent saturated quickly at 40 mg/L, thereby exhausting column earlier than other concentrations (Afroze et al 2016;Karami et al 2021).…”

A Fixed-Bed Study on the Feedsorption of BSA Using PKC: Toward the Sustainable Agrosorption of Protein-rich Waste for Enhancing Low Nutritional-value Feed

“…This study suggests that while increasing bed depth can enhance adsorption capacity, there exists an optimal bed height beyond which further increases do not necessarily lead to higher qeq. In a study by Karami et al [20], the adsorption potentials of an iron-based metal-organic framework (Fe-BTC) for methyl orange removal were examined through both batch and fixed-bed column studies. The research showed that at bed depths of 0.75 and 1.5 cm, the breakthrough times were 20.0 and 46.2 h, respectively, with maximum adsorption capacities of 20.2 and 21.6 mg/g.…”

Parametric Study of Methyl Orange Removal Using Metal–Organic Frameworks Based on Factorial Experimental Design Analysis

“…One major component of industrial wastewater effluents is the discharge of a substantial amount of synthetic dyes due to their wide-ranging applications, including in textiles, printing, plastic, and food processing [13,14]. To prevent any potential hazards caused by these dyes to the surrounding environment of aquatic life and humans [15], industrial wastewater effluents are usually treated by several physical and/or chemical treatment processes to remove these synthetic dyes [16]. These treatments include flocculation combined with flotation, electroflocculation, membrane filtration, electrokinetic coagulation, electrochemical destruction, and ion exchange [17,18].…”

“…Traditionally, activated carbon (AC) is used as an adsorbent for quickly capturing dyes from wastewater and lowering their concentration in effluents. However, AC as an adsorbent generally shows very little selectivity over molecules of different sizes and has a high regeneration cost when exhausted [16]. Therefore, the development of efficient and cost-effective adsorbents is urgently needed.…”

“…Haque et al (2010) were the first group to report the adsorptive removal of dyes using MOFs, where they employed chromium-benzene dicarboxylates MOFs (Cr-BDCs) for methyl orange (MO) adsorption [22]. Since then, several investigators have reported their findings on the removal of different dyes using various lab-synthesized MOFs as adsorbents [14][15][16][17][18][19][20][21][22][23][24][25][26]-for example, iron 1,3,5-benzenetricarboxylate (Fe-BTC) MOF, has been used in the liquid-phase separation of various molecules/compounds (organic and inorganic) [27,28]. Similarly, copper benzene-1,3,5-tricarboxylate (Cu-BTC) is a widely investigated MOF in different environmental applications, such as gas storage and adsorptive separation [29,30], and was used for methylene blue adsorption from water [31].…”