S. Shojaei, S. Shojaei
Jun 21, 2018
Citations
1
Influential Citations
46
Citations
Journal
International Journal of Environmental Science and Technology
Abstract
The study investigated the degradation and removal of Acid Red 114 (AR-114) and Basic Blue 41 (BB-41) as a model of azo dyes of aqueous solutions by using nanoscale zero-valent iron (NZVI). Both the size and the surface morphology of NZVI particles were specified by XRD and SEM techniques. The removals of AR-114 and BB-41 were studied at different experimental conditions, including catalyst amount, dye concentration, solution pH and the contact time. The removal parameters were modeled by response surface methodology. Given the low P value (< 0.0001), high F value (more than 85 for both dyes), R2 = 98.76% and Adj-R2 = 97.61% for AR-114 and R2 = 99.50% and Adj-R2 = 99.04% for BB-41 and nonsignificant lack of fit for both dyes. Given the ANOVA results, there is a positive relationship between the experimental and predicted values of the response. The results indicated that NZVI particles had removed more than 94% of both dyes under the optimum operational conditions. The optimum catalyst amount, dye concentration, pH of the solution and contact time were found to be 0.40 g, 4.00 mgL−1, 5.00 and 106.00 s, respectively, for AR-114 and those for BB-41 were 0.80 g, 9.00 mgL−1, 9.00 and 205.00 s, respectively.