Arsenic adsorption performance and mechanism using the iron-carbon fiber and nano cerium dioxide incorporated composite adsorbent
Cerium dioxide nanoparticle was incorporated on the surface of the iron-doped carbon fiber surface for the fabrication of the iron-carbon fiber@CeO2 composite adsorbent.The microstructure and phase composition of the as prepared iron-carbon fiber@CeO2 composite were systematically investigated using scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS)which was conducted to evaluate the wastewater rsenic(As)adsorption performance and affinite mechanisms using this adsorbent.The introduction of iron significantly enhanced the mechanical strength of the micro/nano fibers and promoted the uniform dispersion of cerium dioxide on the carbon fiber surface.Notably,the nano-sized CeO2 was effectively anchored onto the surface of the micro-sized iron-carbon fibers,resulting in a highy exposed and continuous nano cerium dioxide interface.The particle sizes of CeO2 was appropriately 6 to 9 nm.Adsorption experiments conducted under various pH conditions(3to 10)revealed the As ions containing wastewater with a intial concentration of 2mg/L was decreased to below 50μg/L within 2-hour adsorption under wide solution pH.The coexistence of phosphate ions would affect the adsorption of As in composite materials.Furthermore,the iron-carbon micro/nano fiber@CeO2 composite dispalyed outstanding selective affinity for arsenic ions.The adsorption kinetics conformed to the pseudo-second-order model,and the adsorption isotherm data well matched with the Langmuir isotherm,indicating the adsorption behivior is primarily governed by monolayer chemical interactions,with a maximum adsorption capacity of 49.02mg/g.Additionally,the desorption experiments showed that when using the 0.1mol/L NaOH as desorption solution,the arsenic removal efficiency remained above 95％after five cycles of adsorption-desorption repetition,which highlighting the remarkable cyclic stability of the iron-carbon fiber@CeO2 composite adsorbent.The mechnisum study indicated that the adsorption pathway involves ligand exchange between hydroxyl groups and arsenate ions.
electrospinningmicro/nano fiberscerium dioxidewastewater As adsorptionperformance and mechanism
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