ABSTRACT
Ion silver from the internal surfaces tubes and generators inter to industrial wastewater by corrosion process. These ions have harmful effects on plants, animals and humans. Iron oxide is commonly used to removal chemical contaminates. However, the used of nanoparticles in removing pollutants is more effective than the mass. In this study, using of iron oxide nanoparticles for removal silver ions from synthetic industrial wastewater was investigated and the effective parameters were optimized for the better removal. This study is a experimental-laboratory that iron oxide nanoparticles was synthesized by exposing nZVI into air and then Ag+removal efficiency was studied in batch system. Also, the impact of the important field parameters including pH, iron oxide nanoparticles concentration, retention time, and temperature were investigated. After centrifugation and filtration, the amount of ion silver was determinate by flame atomic absorption. The results of this research showed that iron oxide particles were reacted with Ag+in nano scale. The maximum removal at pH=3, nano iron oxide concentration 35 g L-1 and 25°C was 99.2%.In optimum condition [pH=3, nano iron oxide concentration 10 g L-1, 5 hours reaction time and 25°C temperature] 87% of Ag+was removed. The concentration of nano iron oxide and pH had significant effect on the Ag+removal. The results showed that Ag+removal in acidic pH controlled by absorption on surface then reduction by atomic core. While, removal in basic pH controlled by absorption. The studies showed that iron oxide nanoparticles have high ability to remove Ag+and decrease of chemical pollution of Ag+from industrial wastewater
ABSTRACT
Diabetes mellitus is one of the most common metabolic disorders due to partial or complete deficiency of insulin or insulin resistance. The most common problems is uncontrolled diabetes are chronic complication including renal and cardiovascular failure. Zinc as an essential trace element, can affect some aspects of insulin synthesis, secretion and function. The aim of this study was to evaluate the effect of zinc supplementation in diabetes control status in a group of type-II diabetic patients. In this clinical trial, 60 fdiabetic patients [type-II] were divided in 2 groups, randomly. One of them consumed 25 mg/day zinc and the other had 50 mg daily for 2 months. Fasting blood glucose [FBS], 2 hour post prandial blood glucose [2hpp], glycosylated hemoglobin [HbA1c], and serum levels of zinc were evaluated in patients before and after zinc supplementation. Wilcoxon and Man-Whitney tests were used for statistical analysis. 22 patients in each group with the mean age of 48 years completed the study. Serum levels of zinc in the group with 25 mg/day supplementation didn't show significant change, but in the second group increased significantly after supplementation [160 +/- 30 micro g/dl vs 140 +/- 30, p=0.002]. HbA1c significantly reduced after supplementation [9.7 +/- 1.86 vs 8.9 +/- 1.5, p=0.02]. There were not significant changes in FBS and 2hpp before and after zinc supplementation. Our results indicate that elevation of zinc level in diabetic patients has favorable effect on HbA1c and diabetes control status. It is assumed that some of the diabetic patients suffer from a latent zinc deficiency and this may by unfavorably diabetes control status