Boron removal is essential for water treatment to ensure the human health and safety. MgO was found to take up B from H3BO3 solutions, due to the electrostatic attractive force of the positively charged MgO with B(OH)4 −. B adsorption could be expressed by pseudo-first-order reaction kinetics. The Arrhenius plot of the rate constants yielded an apparent activation energy of 72.0 kJ mol−1 for B adsorption onto MgO, confirming that the uptake of B went through under chemical reaction control. This process was a Langmuir-type adsorption. The value of the maximum adsorption was 21.5 mmol g–1. B desorption from MgO particles containing adsorbed B(OH)4 − species was possible using a NaOH solution. The B adsorption ability of the regenerated MgO was lower than that of the original MgO. However, regenerated MgO could still take up B from H3BO3 solution, indicating that MgO can be recycled for B adsorption.
ASJC Scopus subject areas
- Safety, Risk, Reliability and Quality
- Waste Management and Disposal
- Process Chemistry and Technology