The response surface plot showing the effect of (a) pH and initial concentration of PFF, (b) catalyst dosage and initial concentration of PFF, (c) pH and catalyst dosage on pesticide degradation using Fe/Ni bimetallic nanoparticles. (A: Initial concentration (mg/L), B: Catalyst dosage (g/L), C: pH). 

Contexts in source publication

Context 1

... relative variables on the degradation efficiency was tested as the others were held constant ( The combined effect of catalyst dosage and initial PFF con- centration is shown in Fig. 5(b). PFF degradation increased as initial concentration increased for lower concentrations of PFF. This trend reversed at higher concentrations of PFF. Increasing the catalyst dosage at lower concentrations decreased efficiency; increasing it at higher concentrations increased PFF degradation. This can be attributed to the fact that, at low dosages, increasing the PFF concentration after saturation of the binding sites decreased degradation. At higher doses, degradation was relatively higher because of the increased availability of active binding ...

Context 2

... response surface plot for the combined effect of solu- tion pH and catalyst dosage is shown in Fig 5(c). It shows that, at lower pH, PFF degradation decreased as the catalyst dosage increased; this trend was reversed for higher (alkaline) pH. This can be explained by the reversal in the ionic structure of nanoparticles under acidic and basic media. The Fe/Ni sur- face charge for the pH area at pH zpc (pH area is the pH zpc in spaces where the catalyst surface charge is zero) is positive in response to the increase in H in the solution. Nevertheless, for the pH area above pH zpc (7.3), the Fe/Ni surface charge was negative in the presence of OH in the solution; colonic forces are the main reason for this behavior. The values of P > F less than 0.0500 indicate model terms are significant, whereas the values greater than 0.1 are not significant. The values of P > F less than 0.0500 indicate model terms are significant, whereas the values greater than 0.1 are not significant. Figure 4 Pareto graphic ...