A new reusable adsorbent of polyvinyl alcohol/magnesium peroxide (PVA/MgO2) for highly selective adsorption and dye removal

Abstract

New adsorbent polyvinyl alcohol/magnesium peroxide (PVA/MgO 2 ) nano-composite films have been designed for high selective adsorption and dye removal applications. Creation of MgO 2 within 40 ± 3 nm has been confirmed by TEM. PVA/MgO 2 films have a large surface area of 59.130 m 2 g −1 , high pore volume 0.191 cm 3 g −1 and a high negative surface charge _ 36.4 mV at pH environment ~12, which plays an important role in increasing the uptake capacity, removal efficiency and the selective adsorption performance. PVA/MgO 2 nano-composite shows a high selective adsorption for MB dyes from a mixture solution containing both MB and MO dyes. Experiments showed that 30 mg of PVA/MgO 2 has the ability to remove 50 mL of 25 mg/L of MB dye with an efficiency (99.9 ± 0.1%) in a fast time ~15 min under the experimental conditions. The Langmuir model is the isotherm model, the pseudo second order is the adsorption kinetics as well as the exothermic is thermodynamic process of the adsorption process. In addition, PVA/MgO 2 nano-composite shows a high catalytic activity, in the recycling test, for ten cycles of MB adsorption. • New PVA/MgO 2 nanocomposites were prepared by casing method for selecting and removing MB dyes for the first time. • PVA/MgO 2 has a high surface area of 59.130 m 2 g −1 and a high negative surface charge _ 36.4 mV. • PVA/MgO 2 shows a high catalytic selectivity for MB dyes from mixture solution containing both MB and MO dyes. • 30 mg of PVA/MgO 2 has the ability to remove 50 mL of 25 mg/L of MB dye with efficiency (99.9 ± 0.1%) in a fast time 15 min. • PVA/MgO 2 shows a high catalytic activity, in the recycling test, for ten cycles of MB degradation.