Abstract
Wastewater containing azo dye has become a main harm in water pollution. Therefore, development of environment friendly materials with efficient purifying capacity seized more and more attention of people devoting to dye wastewater processing. On the other hand, advancement of metallic glasses in degrading organic water contaminant has also received wide concern. Cu-based amorphous alloy has excellent corrosion resistance and good stability in the process of degradation of azo dyes In the present thesis, single roller melt-spinning method Cu-Zr-Al-Y metallic glasses is applied so as to investigate degradation of azo dye Direct Blue in acid and alkaline solution. It is concluded that when the value of it is 2, 25μm ~ 30μm thick stripes of non-crystalline structures will be formed. With variation of the pH, rate of degradation will also change. The degradation rate in acidic solution is higher than that in alkaline and neutral solution. This is due to the fact that Azo bond and Cu-based amorphous alloy in dye molecule requires quite low activation energy to react, which makes degradation easier to proceed and thus macroscopic decoloration is also quickened. After the treatment of wastewater, white corrosion products will be produced on the surface of amorphous strip. It will affect the degradation effect.
Highlights
In the last few years, the discharge of industrial wastewater, especially printing and dyeing wastewater, has caused great harm to the natural environment and people's living water, so treatment of wastewater has become urgent
We studied the reactivity of Cu-Zr-Al-Y metallic glasses in degrading Direct Blue azo dye solutions
All experiments were conducted in 100mL beakers, which were placed in a magnetic stirrer
Summary
In the last few years, the discharge of industrial wastewater, especially printing and dyeing wastewater, has caused great harm to the natural environment and people's living water, so treatment of wastewater has become urgent. It is recently discovered that, Fe—Si—B amorphous alloy could degrade the azo dye of acid orange II dye solution [9, 10], and degrading effect of it is better than homo-componential crystalline alloy and commercial iron powder Wang [11] produced Mg-Zn-Ca powder through ball-milling method, and it turns out that Mg-Zn-Ca powder bears stronger degrading and decay resistance properties than its corresponding crystalline-state powder. We studied the reactivity of Cu-Zr-Al-Y metallic glasses in degrading Direct Blue azo dye solutions. The reaction mechanism has been studied based on the evolution of surface morphologies and the compositions change for the metallic glass ribbons. Xiao Chen Xu and Ke Qiang Qiu: Fast Degradation of Azo Dyes by Using Cu-based Metallic Glasses
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