Adsorption of copper by magnetic graphene oxide-supported β-cyclodextrin: Effects of pH, ionic strength, background electrolytes, and citric acid

- Cu(II) adsorption increased with the increase of ionic strength at pH < 8.
- LiCl, NaCl, and KCl had similar effects on the Cu(II) removal.
- The presence of NaCl, NaClO4, and NaNO3 improved the Cu(II) uptake.
- Citric acid had significant promoting effect on the Cu(II) adsorption.
- The Cu(II) adsorption process followed the pseudo-second-order rate equation.