فهرست نشریات علمی دسترسی آزاد ایران

In this work, a green-synthesised ZnO–MgO nanocomposite made from orange peel extract is used to study the synergistic adsorption and UV-assisted photocatalytic degradation of malachite green (MG) dye from aqueous solutions. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) were used to exchange data regarding the structure, chemistry, and form of the nanocomposite. Several operational parameters, such as adsorbent dosage, contact time, initial dye concentration, temperature, and UV irradiation conditions, were used to assess a removal performance in a batch system. Experimental results indicated that the ZnO–MgO nanocomposite had improved adsorption effectiveness under optimum circumstances, however the combined UV-photocatalytic process markedly increased the degradation of MG compared to adsorption alone. The Langmuir isotherm model suited the data for equilibrium better. This suggests that there was one layer of adsorption on a flat surface. Negative ΔG° results showed that the elimination process is spontaneous and possible, which was supported by thermodynamic characteristics.  Studies on regeneration and reusability showed that the ZnO–MgO nanocomposite maintained its high removal effectiveness across several cycles. After being washed, dried, and reactivated with UV light several times, the material still had most of its ability to adsorb and photocatalyze. The fact that it is stable means that the composite is good for the economy and can be used for a long time. The material is very recyclable because it is strong, keeps active surface sites, and does not rust when exposed to UV light.  The green-synthesized ZnO–MgO nanocomposite was very good at getting rid of malachite green dye by using both adsorption and UV photocatalysis. It could be a long-lasting and cost-effective material for advanced wastewater treatment because it has a lot of activity, is stable, and can be used again.