Kinetics and Isotherms Studies of the Adsorption of Hg(II) onto Iron Modified Montmorillonite/Polycaprolactone Nanofiber Membrane

2019 2nd International Conference on Materials Engineering and Applications

Raj Somera, Lester^1 ; Cuazon, Ralph^1 ; Kenneth Cruz, John^1 ; Joy Diaz, Leslie^1

Department of Mining, Metallurgical and Materials Engineering, University of the Philippines Diliman, Quezon City, Philippines^1

关键词: Adsorption behavior;    Adsorption capacities;    Contaminated water;    Freundlich isotherm;    Isotherm models;    Modified montmorillonite;    Nanofiber membrane;    Pseudo-second order model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/540/1/012005/pdf
DOI  :  10.1088/1757-899X/540/1/012005

来源: IOP

【 摘 要 】

Hg(II) ions from mining and urban runoffs can easily contaminate various water sources due to their high solubility in water. Due to its simplicity and viability, adsorption was utilized to treat Hg(II)-contaminated water. An adsorbent was fabricated by immobilizing Fe-modified montmorillonite particles in polycaprolactone through electrospinning. The SEM images of the fabricated membrane showed a nanofiber network with fiber diameter ranging from 96 nm to 569 nm and an average of 198 nm. The adsorption behavior of the fabricated membrane was investigated using kinetics and isotherm models. It was found that the adsorption of Hg(II) ions onto the membrane follows a pseudo-second order model and was best described by the Freundlich isotherm. The adsorption capacity was found to increase with increasing contact time and with increasing initial Hg(II) concentration, with the highest adsorption capacity of 14.25 mg/g. The sorption energy was calculated using the DubininKaganer-Radushkevich isotherm, which obtained a value of -2.68 kJmol-1 suggesting that the type of adsorption was physisorption.