MS title: Catalytic oxidation and removal of arsenite in the presence of Fe ions and zero-valent Al metals

作者：Hsu Liang Ching; Chen Kai Yue; Chan Ya Ting; Deng Youjun; Hwang Che En; Liu Yu Ting^*; Wang Shan Li; Kuan Wen Hui; Tzou Yu Min^*

来源：Journal of Hazardous Materials, 2016, 317: 237-245.

DOI：10.1016/j.jhazmat.2016.05.071

• Arsenic
• Hydrogen peroxide
• Acid mine drainage
• Waste Al beverage can

Arsenic immobilization in acid mine drainage (AMD) is required prior to its discharge to safeguard aquatic organisms. Zero-valent aluminum (ZVAI) such as aluminum beverage cans (AIBC) was used to induce the oxidation of As(III) to As(V) and enhance the subsequent As removal from an artificially prepared AMD. While indiscernible As(III) oxidation was found in aerated ZVAI systems, the addition of 0.10-0.55 mM Fe(II) or Fe(III) into the AMD significantly promoted the As(V) production. Reactions between Fe(II) and H2O2, which was produced through an oxidative reaction of ZVAI with dissolved oxygen, generated OH radicals. Such OH radicals subsequently induced the As(Ill) oxidation. Over the course of the Fenton like reaction, ZVAI not only directly generated the H2O2, but indirectly enhanced the OH radical production by replenishing Fe(II). Arsenite oxidation in the aerated ZVAI/Fe and AIBC/Fe systems followed zero- and first-order kinetics. Differences in the kinetic reactions of ZVAI and AIBC with respect to As(III) oxidation were attributed to higher productive efficiency of the oxidant in the AIBC systems. After the, completion of As(III) oxidation, As(V) could be removed simultaneously with Al(III) and Fe(III) by increasing solution's pH to 6 to produce Al/Fe hydroxides as As(V) scavengers or to form Al/Fe/As co-precipitates.

• 出版日期2016-11-5