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 speci c surface area values (near 332 m 2 .g − 1 ) and total mesoporous volume (near 0.038 cm 3 .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 rst-and pseudo secondorders, were exercised to the experimental results. The kinetic analysis revealed that the pseudo second order rate law performed better than the pseudo rst order rate law in promoting the formation of the chemisorption phase. In the case of isothermal studies, an analysis of measured correlation coe cient (R 2 ) values showed that the Langmuir model was a better match to experimental results than the Freundlich model. By regeneration experiments after ve cycles, acceptable results were observed.

Low-Temperature and Additive-Free Synthesis of Spherical MIL-101(Cr) with Enhanced Dye Adsorption Performance

“…Herein, we select methyl orange (MO) and rhodamine B (RB) as the model compounds for the adsorption experiments of MIL-101(Cr)s. Obviously, spherical MIL-101(Cr) (160-MIL-101) exhibited the best adsorption capabilities toward MO and RB among all samples, with maximum uptakes of 444.3 mg g −1 and 230.3 mg g −1 , respectively (Figure S4). Especially for the adsorption of MO, the uptake of 160-MIL-101 is significantly higher than that of other adsorbents which have been reported in recent years (Table 2) [64][65][66][67][68][69][70][71][72]. The uptake of 160-MIL-101 is also significantly higher than other MIL-101 and MIL-101 composites from several studies (Table S3) [23,61,[73][74][75][76][77][78].…”

Nanofused Hierarchically Porous MIL-101(Cr) for Enhanced Methyl Orange Removal and Improved Catalytic Activity

“…Nevertheless, for MO adsorption, H-MIL-101(Cr) exhibited a high adsorption capacity of 369.8 mg g −1 , which was 1.52-fold higher than that of P-MIL-101(Cr) (229.4 mg g −1 ) ( Figure 4 a). Compared with the other adsorbents, the adsorption value of H-MIL-101(Cr) toward MO was significantly high ( Table S1 ) [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. This may be attributed to its unique meso/macroporous structure, which allowed more big dye molecules, such as MO, into the larger meso/macropores and hence improved its dye adsorption capability.…”

Application of Activated Carbon Adsorbents Prepared from Prickly Pear Fruit Seeds and a Conductive Polymer Matrix to Remove Congo Red from Aqueous Solutions

“…Among the conductive polymer, PANI is one of the most popular ones because it exhibits high redox stability, simple synthesis, and high performance capacity and is ecofriendly and inexpensive [31][32][33]. From the scientific and technological point of view, PANI is selected as an active material because of its easy preparation, efficiency, and broad effectiveness [33].…”