Abstract
For study in this paper, nano zinc oxide/graphene composites were prepared at 120 °C with graphene oxide and nano zinc oxide as precursors for the photocatalytic activity of the composites to be tested under 300W xenon lamp in the simulated ceftazidime antibiotic wastewater. Then this paper studies the effects of the pH value on degradation of the ceftazidime solution in treatment by the graphene/ZnO composites as well as the effects of its initial concentration on the degradation time and conducts the kinetic analysis. The results show that the degradation rate of ceftazidime is subject to the pH value, increasing with the pH value. When the pH value is 5, the degradation rate is the highest at 78.8%, so 5 was selected as the pH value of the ceftazidime solution to be degraded. Moreover, it can be seen from the comparison between the pseudo-second-order and pseudo-second-order kinetics models that the former can better simulate the ceftazidime degradation process by the composite materials by further explaining that the degradation process is not a simple diffusion one but a chemistry one.
