Arsenic adsorption performance and mechanism using the iron-carbon fiber and nano cerium dioxide incorporated composite adsorbent
ZHUANG Yan1, HUANG Jiu1, ZHU Xiao-fang2, LI Peng1
1. School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China; 2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Abstract：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.
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