Synthesis of novel polyaniline/MgO composite for enhanced adsorption of reactive dye

Abstract

In this investigation, the porous structure of polyaniline/MgO (PANI/MgO) composites has been successfully synthesized by in-situ oxidative polymerization method. The as-prepared materials were characterized by Ultraviolet-visible absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The obtained composites, for the first time, are used as an adsorbent for the removal of the sulfonated anionic dye reactive orange 16 (RO) from aqueous solution. The equilibrium adsorption isotherms of RO on the PANI/MgO composites were analyzed by Langmuir and Freundlich models, suggesting that the Langmuir model provides the better correlation of the experimental data and maximum adsorption capacity was found to be 558.4 mg g 21 . In addition, adsorption kinetics was followed by both pseudo-first-order and pseudo-second-order, but the latter model matches the results much better than the former one.

Facile synthesis of a triptycene‐based porous organic polymer with a high efficiency and recyclable adsorption for organic dyes

“…and pseudo‐second‐order [eq. ] kinetic models were applied: where t is the adsorption time (min), Q t and Q e are the adsorption amounts at a certain time t (min) and equilibrium (mg/g), respectively; and k 1 (min –1 ) and k 2 (mg g –1 min –1 ) are the rate constants of the pseudo‐first‐order and pseudo‐second‐order models, respectively …”

“…where t is the adsorption time (min), Q t and Q e are the adsorption amounts at a certain time t (min) and equilibrium (mg/g), respectively; and k 1 (min -1 ) and k 2 (mg g -1 min -1 ) are the rate constants of the pseudo-first-order and pseudo-second-order models, respectively. 29 A color change from deep to shallow was clear, as shown in Figure 8. The fitting results in Table II and Figure S2 (Supporting Information) showed that R 2 fitted to the pseudo-second-order kinetics model was higher than that fitted to the pseudo-firstorder kinetics model for both MB and DSB; this suggested that the adsorption of both dyes primarily followed the pseudo-second-order kinetics model rather than pseudo-first-order kinetics model.…”

Urea-Assisted Synthesis of Nanospherical and Plate-Like Magnesium Oxides for Efficient Removal of Reactive Dye Wastes

“…Present statistics related to colour index states that there are approxi-mately 10000 types of being manufactured with more than 700000 tons of annual production [4]. Reactive dyes are one of the most widespread dyes used in colouring textiles because they offer greater stability and durability in contrast to other dyes by making covalent bonds between dye molecules and the cellulose or protein fibers [5][6][7][8].…”

“…Magnesium oxide nanoparticles (MgO-Nps) are synthesized by various methods such as sol gel method [13][14][15], sonochemical methods [16], microwave methods [17,18], biosynthetic methods [19], laser ablation [20], and precursor methods [20][21][22]. MgO-Nps are used in a broad range of applications such as for carbon monoxide and sulfur dioxide adsorption [23][24][25], dye adsorption and degradation [5,[26][27][28][29], heavy metal removal [30], and photocatalysis [31,32].…”

"REUSABLE STARCH-GRAFT-POLYANILINE/Fe3O4 COMPOSITE FOR REMOVAL OF TEXTILE DYES"

“…PANI polymer composite has been studied for adsorption of heavy metal and textile dyes. [10][11][12][13] Starch and its composite have many useful features such as biocompatibility and biodegradability property. 14,15 Starch/polyaniline and chitosan/polyaniline composites were prepared for enhanced removal of textile dyes from the synthetic effluent.…”