Application Of Fe-based Metallic Glasses In Wastewater Treatment

Our living environment gets to worse every day, how to reduce the effect by human being to the nature environment, and how to get the safe drinking water for nature water, was the one of the most concern problem in 21st century. Present thesis taking Fe78Si9B13 as main research subject, mainly concerns the application of Fe-based metallic glasses in organic wastewater degradation and ability of anti-microbe in sewage disinfection.The Fe-based metallic glasses have effectively removed the organic pollutants in wastewater. Designed test reaction vessel in this study was a reference to the micro electrolysis technologies with iron scrap. The main parameter of organic content in wastewater is Chemical Oxygen Demand. In the same conditions, the degradation ability of Fe-based metallic glasses and iron scrap in composite wastewater has been compared in this paper. The Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 have successfully removed the Chemical Oxygen Demand about 18.93% and 22.93% in 30 minutes, which equal to the iron scrap, but only 1/25 in dosage.The Fe78Si9B13 metallic glasses exhibited a good result in the re-used prospect. The loss of mass was less than 1.4% in single test, and keep stable in multiple re-use test. No crystallization of Fe78Si9B13 was found in the XRD pattern. However, exposure to air would make the serious rust on the surface of Fe78Si9B13.A mechanism which described the corrosion of Fe-based metallic glasses in unstable fluid has been discussed and considered which correlated to the organic pollutants degradation.The Fe-based metallic glasses have also inhibited the microbe, including bacteria, fungus and actinomycetes. Fe-based, Ni-based and Cu-based metallic glasses all show anti-bacterial capability in shake culture. To determine the number of bacteria used optical density (OD) value by turbidimetry method. The OD value of E. coli suspension with metallic glasses was 65% lower than match group, and 57% lower than group with ferrite. Moreover, the bacteriostatic effect was no significantly different (σ=0.05) among Cu-based, Ni-based and Fe-based metallic glasses. However, the bacteriostatic effects of all metallic glasses have faded away when the number of bacteria increased. The phenomenon has been improved by observation successive in plate culture. An observation boundary of bacteriostatic ring was found in plate culture, and its essence was super high concentration of colony. Fe78Si9B13 has the greatest radius of bacteriostatic ring among the metallic glasses, which was 3.44 mm, and less than 1/8 of ferrite which was 24.4 mm. With time increasing, the radius of bacteriostatic ring did not increased but reduced, even completely vanish, e.g. Cu64Hf36,Fe78Si9B13. And its boundary would disappear after the bacteriostatic ring.This research enlarges the application field of metallic glasses, and exhibits the industrial application prospects of Fe78Si9B13 in waste water treatment. This thesis lay out new theories and stretch the perception of both the degradation organic with zero valent iron and the bacteriostatic effect of metallic antibacterial materials.