Anionic Methyl Orange Removal from Aqueous Solutions by Activated Carbon Reinforced Conducting Polyaniline as Adsorbent: Synthesis, Characterization, Adsorption Behavior, Regeneration and Kinetics Study

Abstract

This work investigated the elimination of Methyl Orange (MO) using a new adsorbent prepared from Activated Carbon (AC) with polyaniline reinforced by a simple oxidation chemical method. The prepared materials were characterized using XRD, TGA, FTIR and nitrogen adsorption isotherms. Furthermore, PANI@CA highest specific surface area values (near 332 m2.g− 1) and total mesoporous volume (near 0.038 cm3.g− 1) displayed the better MO removal capacity (192.52 mg.g− 1 at 298 K and pH 6.0), which is outstandingly higher than that of PANI (46.82 mg.g− 1). Besides, the process's adsorption, kinetics, and isothermal analysis were examined using various variables such as pH, MO concentration and contact time. To pretend the adsorption kinetics, various kinetics models, the pseudo first- and pseudo second- orders, were exercised to the experimental results. The kinetic analysis revealed that the pseudo second order rate law performed better than the pseudo first order rate law in promoting the formation of the chemisorption phase. In the case of isothermal studies, an analysis of measured correlation coefficient (R2) values showed that the Langmuir model was a better match to experimental results than the Freundlich model. By regeneration experiments after five cycles, acceptable results were observed.

Water decontamination in terms of Hg(II) over thiol immobilized magnesium ferrite: Gum Arabic biosorbent—response surface optimization, kinetic, isotherm and comparing study

“…Contamination of surface and ground water with heavy metals is a special concern in terms of environmental protection. Among heavy metals mercury is a priority toxic compound as the European Union (EU) legislation appointed the allowable level of 0.07l μg/L in surface water [1,2].…”

Electronic band structure of Bi5O7NO3 and its methyl orange removal mechanism

“…Thus, the adsorption technique was selected as an economical method for dye removal due to its efficiency, simplicity in design and operation, and low energy consumption. In this regard, several adsorbent systems have been reported for dye wastewater treatment in recent years [11,12]. The ability of Bi5O7NO3 to work as an adsorbent has been described in the prior literature [1].…”