Isotherm and Kinetics Parametric Studies for Aqueous Hg(Ⅱ) Uptake onto N‑[2‑(Methylamino)Ethyl]Ethane‑1,2‑Diaminated Acrylic Fibre

摘要

N-[2-(methylamino)ethyl] ethane-1,2-diaminated acrylic fibre (DAAF) derived adsorbent was prepared by the reaction ofacrylic fibre with bis(2-aminoethyl)amine. Fourier transform infrared spectroscopy and scanning electron microscopy wereemployed for elucidating the surface functional groups and morphology of DAAF, respectively. The influence of severalprocess variables on Hg(Ⅱ) adsorption was also evaluated. Equilibrium and kinetic studies were conducted using a range oftwo-parameter models via nonlinear regression methods. Langmuir and pseudo-second-order models emerged the best fitfor isotherm and kinetic modelling, respectively. The intraparticle diffusion studies indicate that occurrence of an adsorptionprocess, with multi-mechanistic effect. Similarly, the maximum adsorption capacity (q_(max)) of 627.5 mg g~(−1) was recorded inthe study at pH 5.0, 30 °C and 15–30 min. The short equilibration time recorded in the study speaks volume of the potentialapplication of DAAF in large-scale Hg(Ⅱ) adsorption systems.