Competitive Adsorption of Dye Species onto Biomass Nanoporous Carbon in Single and Bicomponent Systems

Abstract

We first present a cost-effective approach to simultaneously dispose of rutaceae plant waste (the discarded peels of orange, finger citron, pomelo and lemon) to yield biomass nanoporous carbons (BNCs). The adsorption of orange II (OII) and acid chrome blue K (ACBK) from aqueous solutions in single and binary dye systems by four types of BNCs were studied in a batch adsorption system. The adsorption studies include both equilibrium adsorption isotherms and kinetics. Four adsorption models for predicting the multicomponent equilibrium sorption isotherms have been compared in order to determine which one is the best fit model to predict or correlate binary adsorption data. The kinetic data were well described by the pseudo-second-order kinetic model. It was found that the adsorption capacity of orange peel-based nanoporous carbon (OPC) is much higher than those of the other types of BNCs. In addition, OPC also shows higher OII uptake capacities from binary dye solutions. The four types of BNCs could be employed as a low-cost alternative for the removal of textile dyes from effluents.

Comprehensive study of simultaneous adsorption of basic red 2 and basic violet 3 by an agro-industrial waste: dynamics, kinetics and modeling

“…These non-linear sections indicate that surface adsorption and intraparticle diffusion processes occur simultaneously. This finding is similar to that reached in previous works [55,56].…”

Amino-rich polymer-coated Fe–Fe2O3 nanoparticles with high adsorption capacity and rapid magnetic separation for anionic dye removal

“…Consequently, only the adsorption sites exposed on the external surface of magnetic Fe-Fe 2 O 3 @PCP composite can really work, so it may lead to multilayer adsorption and deviate from the Langmuir isotherm model as a result. Although the adsorption capacity of magnetic Fe-Fe 2 O 3 @ PCP composite decreases compared with hollow PCP microcapsules, it is still high enough to remove anionic dye (ACBK) compared with the related reports [52,53], and we think it more prospective in reality. And the smaller the value of 1∕n in Freundlich isotherm model, the better the adsorption performance (easy ( 1∕n = 0.1 − 0.5 ), difficult ( 1∕n > 2 )) [54].…”