Adsorption of methylene blue from textile industrial wastewater using activated carbon developed from Rumex abyssinicus plant

Abstract

Methylene blue (MB) is abundantly found in textile industrial effluent which can cause severe health problems for public and environmental ecology. Therefore, this study aimed to remove MB from textile wastewater using the activated carbon developed from Rumexabyssinicus. The adsorbent was activated using chemical and thermal methods, and then it was characterized by SEM, FTIR, BET, XRD, and pH zero-point charge (pHpzc). The adsorption isotherm and kinetics were also investigated. The experimental design was composed of four factors at three levels (pH (3, 6, and 9), initial MB concentration (100, 150, and 200 mg/L), adsorbent dosage (20, 40, and 60 mg/100 mL), and contact time (20, 40, and 60 min)). The adsorption interaction was evaluated using response surface methodology. The characterization of a Rumexabyssinicus activated carbon was found to have multiple functional groups (FTIR), an amorphous structure (XRD), crack with ups and down morphology (SEM), pHpzc of 5.03 and a high BET-specific surface area of 2522 m2/g. The optimization of MB dye removal was carried out using the Response Surface methodology coupled with the Box Behnken approach. The maximum removal efficiency of 99.9% was recorded at optimum conditions of pH 9, MB concentration of 100 mg/L, the adsorbent dosage of 60 mg/100 mL, and contact time of 60 min. Among the three adsorption isotherm models, the Freundlich isotherm model was the best fit with an experimental value at R2 0.99 showing the adsorption process was heterogeneous and multilayer whereas the kinetics study revealed that pseudo-second-order at R2 0.88. Finally, this adsorption process is quite promising to be used at an industrial level.

A new tannin-based adsorbent synthesized for rapid and selective recovery of palladium and gold: Optimization using central composite design

“…Conventional isotherms of Dubinin-Radushkevich (D-R), Freundlich, Temkin, and Langmuir were used to examine the adsorption isotherm of gold and palladium on PT-ED [ [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] , [56] , [57] , [58] ]. The adsorbent capacity and the interaction between the adsorbent and the adsorbate are expressed by the adsorption isotherm.…”

“…The adsorbent capacity and the interaction between the adsorbent and the adsorbate are expressed by the adsorption isotherm. In the Langmuir model, the adsorbent surface is assumed to be homogeneous with adsorption sites having the same energy, and the adsorption of the adsorbed ingredient on the adsorbent surface is considered as a single layer [ [48] , [49] , [50] ]. The linear Langmuir equation (2) is as follows: Where C e is the equilibrium concentration of the solute adsorbed ( ), q e is the solute adsorbed amount per unit mass of the adsorbent ( ), Qm is the maximum capacity of the adsorbent ( ).…”

Fabrication of Graphene-Based Nanofiltration Membrane from Fractionated Bamboo Lignin for Dye Removal and Desalination

“…Due to their compatibility with real-world water treatment challenges, these substances are well-suited for evaluating the performance of filtration membranes. Methylene blue, a representative of basic dyes, is a common cationic dye found in industrial effluent, particularly in the textile and dying industries . It is a useful indicator of a membrane’s ability to filter out organic pollutants since it mimics such pollutants in terms of molecular size, charge, and water solubility.…”

“…Methylene blue, a representative of basic dyes, is a common cationic dye found in industrial effluent, particularly in the textile and dying industries. 59 It is a useful indicator of a membrane's ability to filter out organic pollutants since it mimics such pollutants in terms of molecular size, charge, and water solubility. Similarly, the occurrence of the anionic dye DR-81 in many industrial effluents mirrors that of acidic or anionic pollutants from the textile, paper, and printing sectors.…”

Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

“…Furthermore, dyes such as MG and MB have been identified as water pollutants in both groundwater and surface water 6 , 7 . In this respect, MG and MB dyes are extensively used in various industries, including textile, dyeing, and printing.…”