The effect of dye chemical structure on adsorption on activated carbon: a comparative study

Abstract

The effect of the molecular structure of dyes Eriochrome Black T and Bromophenol Blue on their adsorption on the surface of activated carbon manufactured from locally available biosorbent has been studied. Batch experiments were performed to investigate factors that may affect the adsorption process. The effect of stirring rate was investigated in the range 0–240 rpm, with an initial concentration of 4–100 mg/l and a stirring time of 0–400 min. The mechanism and rate of adsorption were investigated for both dyes using pseudo‐first‐order, pseudo‐second‐order, intraparticle diffusion, and liquid film diffusion models. The monolayer adsorption capacities for Eriochrome Black T and Bromophenol Blue were found to be 36.5 and 39.68 mg/g respectively. The difference in dye uptake was attributed to the presence of the electron‐withdrawing bromine group in Bromophenol Blue. Results showed that the Langmuir isotherm best fitted the adsorption of the two dyes on the prepared activated carbon. The pseudo‐second‐order model best fitted the experimental data, and liquid film diffusion and intraparticle diffusion were the controlling adsorption mechanisms.

Adsorptive uptake of basic dyes from aqueous solution by novel brown linseed deoiled cake activated carbon: Equilibrium isotherms and dynamics

“…The adsorption capacity of LCAC, however, increased continuously from 96.1 to 178.6 mg/g for AO and 79.5 to 132.5 mg/g for AzB with increasing initial dye concentrations. Similar result has been reported for the adsorption of bromophenol blue onto activated carbon (Altaher et al 2014), which has been explained on the basis that higher dyes concentration acted as an increased driving force for the adsorption. The optimum initial dyes concentration was 80 mg/L.…”

Elucidation of Sorption Mechanism of R. arrhizus for Reactive Blue 222 using Equilibrium and Kinetic Studies

“…So, the most important steps are film diffusion, pore diffusion and chemical reaction. Therefore, adsorption diffusion models are mainly constructed to describe the process of film diffusion and/or intra-particle diffusion because the pseudo-first-order and pseudo-second-order models cannot identify the diffusion mechanism [42,43]. Weber and Morris [34] described the intra-particle uptake of the adsorption process to be proportional to the half-power of time.…”

“…Scanning electron microscopy (SEM) has been a primary tool for characterizing the surface morphology and fundamental physical properties of the adsorbent surface. It is useful for determining the particle shape, porosity and appropriate size distribution of the adsorbent [21,42,48]. The morphological profile of the biosorbent revealed a rough and heterogeneous surface with relatively porous matrix of macroporous character, pointing towards its potential in taking up the dye.…”

“…Predominance of amorphous nature revealed by the XRD analysis indicated the accessibility of adsorption sites and thus the suitability of the biosorbent for biosorption. Overall, the sorption process can be described as follows: RB 222 is first adsorbed on the surface of R. arrhizus by chemisorption via electrostatic interaction until the surface functional sites are fully occupied; thereafter dye molecules diffuse into the pores of the biosorbent layers for further interactions [39,42]. A greater boundary layer effect shown by intra-particle diffusion model suggested a greater contribution of the surface adsorption in the rate limiting step.…”

Kinetics, Thermodynamics, and Isothermic Evaluation in Sorption Study of Hazardous Dye Using Sodium Dodecylsulfate Physically Impregnated in Polyester‐Type Polyurethane Foam

“…Studies have reported on different treatments such as degradation (Soutsas et al, 2010), coagulation (Beltrán-Heredia, Sánchez-Martín, Delgado-Regalado, & Jurado-Bustos, 2009), ultrafiltration through membranes (Simoni c, 2009), and adsorption (Bhatt et al, 2012;Kallel et al, 2016;Liu et al, 2009;Melo et al, 2017) for dye removal. The adsorption process is commonly used in industry because of its simple operation, high efficiency, and cost effectiveness with good potential for reuse and recovery (Altaher, Khalil, & Abubeah, 2014;Dallago, Smaniotto, & Oliveira, 2005). Studies have reported that highly functional porous materials act as suitable adsorbents due to the existence of polar and nonpolar groups in their chemical structures that impart effective and excellent chemical as well as thermal resistance properties (Sanghi & Bhattacharya, 2002;Shirke, Dholakiya, & Kuperkar, 2015).…”