It looks like a piece of ordinary household tin foil, but it can effectively remove organic matter and heavy metals in sewage. Recently, the team of Professor Zhang Laichang from Edison Cove University in Australia discovered an iron-based metal glass, which brings unlimited possibilities for the treatment of wastewater from the dye industry and mining. The research results were published in the latest issue of the international journal "Advanced Materials".
Amorphous materials (metallic glass) are a type of solid materials dominated by metallic elements. Amorphous materials are usually obtained by rapid cooling of molten alloys, which retains the structure of liquid metals to the greatest extent, giving it many superior properties. However, not all materials can obtain completely amorphous structures from rapidly cooled molten alloys. How to effectively use partially crystalline amorphous materials has become a new topic.
Zhang Laichang's team found that under the combined action of hydrogen peroxide and fully crystalline iron-based materials, it can rapidly degrade methylene blue dye. They used high-temperature heat treatment to rearrange the original disordered structure in the metallic glass, thereby obtaining a crystalline material containing multiphase intermetallic compounds. During the heat treatment, as the temperature increases, the formed grains will continue to increase, which provides a convenient channel for the rapid transfer of electrons inside the grains. Moreover, because of the obvious potential difference between the multi-phase intermetallic compounds, it is easy to form countless tiny primary batteries inside the material, thereby causing the spontaneous transfer of electrons during the reaction. In sewage treatment, rapid electron transfer can effectively convert pollutants into harmless substances such as water, carbon dioxide, and inorganic small molecules. In other words, the faster the electron transfer, the higher the decontamination efficiency.
Experimental results show that this iron-based metal material is faster than existing technologies for removing heavy metals and organic substances such as dyes. According to statistics, the cost of using this new material to treat 1 ton of sewage is only about $ 15. More importantly, the form of block strips is more conducive to practical application, and its recyclable number is more than 5 times, which has considerable economic benefits. (Reporter Zhang Ye)
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