Chemical carbonization of papaya seed originated charcoals for sorption of Pb(II) from aqueous solution

Copper adsorption onto synthesized nitrilotriacetic acid functionalized Fe3O4 nanoparticles: kinetic, equilibrium and thermodynamic studies

“…59 NTA is a biodegradable and tripodal tetradentate trianionic ligand 60 used protein isolation and purification. Due to some deflocculating 61 properties and is stable in both strongly acidic and basic solutions 62 over a wide temperature range NTA also used in acid base titration. the FeÀ ÀO vibration with strong characteristic peak at 590 cm À1 202 ( Fig.…”

Application of Kenaf Bast Fiber to Adsorb Cu(II), Pb(II) and Zn(II) in Aqueous Solution: Single- and Multi-metal Systems

“…At very acidic medium (pH 2.0), the concentration of H 3 O + ions were high and therefore causes strong competition between H 3 O + and metal ions for an active site at the surface of the KBF. The low amount of metal ion uptake at low pH also could be due to protonation of functional groups of the adsorbent surface [6], [35]. This scenario induced the repulsive forces between protonated functional groups and metal ions, reducing the adsorption capacity of KBF for metal ions.…”

Cadmium(II) Removal from Aqueous Solution Using Microporous Eggshell: Kinetic and Equilibrium Studies

“…The isotherm models are usually investigated for the description of adsorption process and related mechanisms [23]. Langmuir and Freundlich are two isotherm models that are widely used.…”