Batch reactor vs. flow column – Mechanistic investigation and modeling of Au(III) ions adsorption from aqueous solutions containing Ni2+, Na+, Cl− and ClO4− as impurities

Recovery of rare earth elements by nanometric CeO2 embedded into electrospun PVA nanofibres

“…The plot of the initial adsorption rate against the Eu 3+ concentration in the feed (small box in Fig. 9) gives a straight line, indicating a rst-order process, 86 with the observed adsorption coefficient k equal to the slope of the regression line (k ¼ 0.55 L g À1 h À1 ). It is worth noting that the observed rstorder process can be ascribed not only to adsorption kinetics, but also to mass-transport effects.…”