Abatement of Azo Dye from Wastewater Using Bimetal‐Chitosan

Abstract

We introduce a new adsorbent, bimetallic chitosan particle (BCP) that is successfully synthesized and applied to remove the orange II dye from wastewater. The effects of pH, BCP quantity, and contact time are initially verified on the basis of the percentage of orange II removed from the wastewater. Experimental data reveal that the Cu/Mg bimetal and chitosan have a synergistic effect on the adsorption process of the adsorbate, where the dye adsorption by Cu/Mg bimetal, chitosan alone, and bimetal-chitosan is 10, 49, and 99.5%, respectively. The time required for the complete decolorization of orange II by 1 mg/L of BCP is 10 min. The Langmuir model is the best fit for the experimental data, which attains a maximum adsorption capacity of 384.6 mg/g. The consideration of the kinetic behavior indicates that the adsorption of orange II onto the BCP fits best with the pseudo-second-order and Elovich models. Further, the simulated azo dye wastewater can be effectively treated using a relatively low quantity of the adsorbent, 1 mg/L, within a short reaction time of 20 min. Overall, the use of BCP can be considered a promising method for eliminating the azo dye from wastewater effectively.

The behaviors and characteristics of a mesoporous activated carbon prepared from Tamarix hispida for Zn(II) adsorption from wastewater

“…The first sharp portion (t 0.5 = 1.41 À7.07 min 0.5 ) can be act as the external mass transfer. The second subdued section is the slow adsorption stage, where intraparticle diffusion is rate-controlled [2,35]. However, it can be found that none of plots give linear straight line passing through the origin (C 6 ¼ 0) ( Table 4).…”

Efficient Degradation of a Biorecalcitrant Pollutant from Wastewater Using a Fluidized Catalyst-Bed Reactor

“…Azo dyes, a main class of synthetic dyes applied to colorize various products, are complex organic compounds that are toxic and environmentally-resistant (Asgari et al, 2013a). Indeed, the presence of the azo group(s) bound to aromatic rings make azo dyes a very complex and biorecalcitrant class of SOCs (Ramavandi and Farjadfard, 2013;Dong et al, 2007); therefore, they are suitable candidates for examining the catalytic activity of CMA-chitosan and its ability to degrade recalcitrant compounds in the catalytic oxidation process. This is the first instance of the use of a fishery-waste base supporting the CMA in order to remove OG from the wastewater through FBR.…”

The Potential of Sargassum oligocystum Harvested From Persian Gulf for the Adsorption of Copper Ions From Aqueous Solutions

“…As presented in Table 4, values of E were in the typical range of bonding energy for chemisorption (8 -16 kJ/ mol) (22), which demonstrated that in the adsorption of copper onto BSO, ion-exchange and chemisorption played a key role. This data reconfirmed the result obtained from the kinetic study.…”

“…Based on the Langmuir constant, the value of R L for copper adsorption with BSO falls between 0 and 1, which affirmed that copper adsorption was favorable under the selected conditions of this study. In addition, it is known that 1/n in the Freundlich model is adsorption intensity and the values of 1/n indicate the type of isotherm to be irreversible (1/n = 0), favorable (0 < 1/n < 1), or unfavorable (1/n > 1) (22). As shown in Table 4, the 1/n of the Freundlich isotherm obtained was 0.448, which revealed that copper was favorably adsorbed onto BSO.…”