Synthesis, adsorption and theoretical calculation study of the two polar-modified hyper-cross-linked resins for efficient removal of o-toluidine from aqueous solution
Nan Wang, Fengfan Zhu, Maoqi Liu, Jiancheng Zhou, Yiwei Zhang, Yang Ge, Naixu Li
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引用次数: 0
Abstract
Background
In addition to their good structural designability, hyper-cross-linked resins (HCLPs) have a vast adsorption capacity. They are also easy to regenerate. It is an efficient adsorbent for o-toluidine (OT) removal and has broad application prospects.
Method
Two polar-modified hyper-cross-linked resins (PBJSG and BLWT) were synthesized by copolymerization of the monomers (trimellitic anhydride and 2-pyrrolidone) with the non-porous gel-type chloromethylated poly(styrene-divinylbenzene). The static adsorption method was used to study the influence of different factors on the adsorption. The adsorption mechanism of o-toluidine on the two resins was clarified by related theoretical calculations. The dynamic adsorption-desorption process of o-toluidine was finally studied.
Significant findings
The above resins had the best adsorption effect on o-toluidine. The adsorption of o-toluidine on the PBJSG and BLWT resins was feasible, exothermic, and spontaneous. The adsorption rate was controlled by the intraparticle diffusion and film diffusion steps. The affinity between OT and resins was higher than that between resins and OT+ ions. The relatively strong affinity of OT accounted for the high adsorption amount of OT in the pH range of 6–14. The affinity of PBJSG for o-toluidine was higher than that of BLWT. According to theoretical calculation studies, the mechanism of hydrogen-bonding and π-π stacking interaction was clearly revealed. The mixture of 75% ethanol (V/V) and 10% H2SO4 (V/V) was an effective desorption agent. In summary, this work provides a new convenient strategy for the preparation of novel o-toluidine removal adsorbents.
期刊介绍:
Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.