Super-high adsorption performance of 8-HQ Nanofiber for Cr(Ⅵ)ions in aqueous solution
Chromium is extensively utilized in electroplating and various industries owing to its exceptional physicochemical characteristics.Nevertheless,the electroplating operations result in the annual discharge of a substantial volume of Cr(Ⅵ)-containing wastewater,characterized by high toxicity,into the natural environment,posing a significant threat to the ecosystem.To address the challenge of effectively treating highly toxic Cr(Ⅵ)-containing wastewater generated during electroplating processes,this study meticulously examines the removal efficacy of Cr(Ⅵ)from wastewater using 8-hydroxyquinoline nanofiber(8-HQ Nanofiber)as an adsorbent.The paper comprehensively investigates the pertinent performance of 8-HQ Nanofiber in relation to Cr(Ⅵ)ions through a range of experiments,including analyses of pH effects,isotherm characteristics,kinetics,ion coexistence,and cyclic regeneration.The findings reveal that in highly acidic conditions,the 8-HQ Nanofiber consistently demonstrates exceptional adsorption capabilities towards Cr(Ⅵ)ions.Notably,it exhibits a significantly higher maximum adsorption capacity of 460 mg/g compared to the majority of other adsorbents.Moreover,equilibrium adsorption is achieved within a short period of 90 minutes.The adsorption behavior of the 8-HQ Nanofiber towards Cr(Ⅵ)ions adheres to the Langmuir adsorption and pseudo-second-order models,indicating a monomolecular layer adsorption process with chemisorption characteristics.The interaction mechanism between the functional sites and Cr(Ⅵ)ions was investigated through Fourier Transform Infrared Spectroscopy(FT-IR),Scanning Electron Microscopy(SEM),X-ray Photoelectron Spectroscopy(XPS),and Thermogravimetric Analysis(TGA).The results suggest that the N and O functional atoms form coordination bonds with Cr(Ⅵ)ions,delineating a potential mechanism underlying the adsorption process.Furthermore,the material demonstrates exceptional selectivity for Cr(Ⅵ)ions even in the presence of K(Ⅰ),Na(Ⅰ),Mg(Ⅱ),Ca(Ⅱ),Ni(Ⅱ),and Cu(Ⅱ)ions.It continues to exhibit strong adsorption capabilities for Cr(Ⅵ)ions after 6 regeneration cycles,highlighting its potential as an effective adsorption material.Overall,the 8-HQ Nanofiber presents a promising solution for wastewater containing highly toxic Cr(Ⅵ)ions,with the possibility of industrial applications.This study therefore offers a new approach for addressing this environmental challenge.
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