Adsorption characteristics of methyl red dye by Na2CO3-treated jute fibre using multi-criteria decision making approach

Abstract

This article reports the use of sodium carbonate-treated jute fibre (SCTJF), for the removal of an azo dye methyl red (MR). Face-centred CCD, based on RSM, experimental design has been used to acquire a definite number of experimental paths in order to ascertain improved experimentation towards reaching performance characteristics that are ideal in order to remove the dye (MR) dissolved in aqueous solution. Independent variable parameters used for dye removal and maximum adsorption capacity (Qmax) are: rotational speed (100 RPM, 150 RPM and 200 RPM), temperature (293 K, 303 K and 313 K), pH (3, 7 and 11) and adsorbent (SCTJF) dose (10 mg/L, 14 mg/L and 18 mg/L), where Qmax of the treated jute was considered to be the performance measure for dye removal. ANOVA was used in conjunction with a quadratic model of second order to explore the impact of operating variables and their elucidation. pH = 7.08, temperature = 299.57 K, SCTJF dose = 14.74 g/L, and stirring speed = 155 RPM were found to be the best process conditions. With a desirability of 0.98, the computed experimental Qmax (32.11 mg/g) and anticipated Qmax (31.7 mg/g) were in resonance within the domain threshold, indicating outstanding accuracy of the experimentation operations.

Cationic dye removal using surface treated activated carbon as an adsorbent

“…If the value of activation energy of the adsorption process is 40 kJ mol −1 , sorption is considered to be controlled by physical adsorption, and if it is more than 40 kJ mol −1 , the process follows chemical adsorption. 49 An empirical relation is given by Arrhenius for this energy: K p2 = Ae − E a / RT where K = adsorption rate constant, R = ideal gas constant, A = constant of proportionality which varies from one process to another, E a = activation energy of the process, T = temperature (Kelvin).…”

“…If the value of activation energy of the adsorption process is 40 kJ mol −1 , sorption is considered to be controlled by physical adsorption, and if it is more than 40 kJ mol −1 , the process follows chemical adsorption. 49 An empirical relation is given by Arrhenius for this energy:…”

Preparation and application of carboxylated and mechanically attrited carbon for adsorptive removal of crystal violet dye

“…This structural change that occurs during the adsorption process is favored by the increased surface area. 29 The pore size distribution is mostly concentrated in the region of less than 30 nm, indicating that CAC exhibited mesoporous characteristics having ultrafine pore diameters and large specific surface area.…”

“…Applying the operation of natural log (at the base e) to both sides of eqn (29) gives the linearized form of the Arrhenius relation as:…”

Study the Interaction Adsorptive Behavior of Sunset Yellow Dye and Loratadine Drug: Kinetics and Thermodynamics Study

“…To attain equilibrium in the adsorption of SY on the drug, it required 50 min to reach equilibrium then the amount of dye adsorption did not significantly alter over time. This is possible because vacant surface sites are available during the initial stages of adsorption, but after some time passes, the vacant sites become filled by dye molecules [13]. The relating plot Figure (6) illustrates how the amount of SY adsorbed depends on changing initial SY concentration and rises with initial SY concentration enhancement.…”