水中As(Ⅲ)高级氧化技术的研究进展

Research Progress of Advanced Oxidation Technology of As(Ⅲ)in Water

砷的毒性不仅与其含量有关,更取决于砷元素的形态。砷有多种价态,在自然条件下砷主要为正三价和正五价。无机砷中三价砷的毒性明显高于五价砷,其毒性约为五价砷的30~60倍,且五价砷的吸附性和稳定性更强。故工艺过程中多将As(Ⅲ)氧化为As(Ⅴ)进而脱除或进一步回收利用。重点介绍了水中As(Ⅲ)的高级氧化法(过硫酸盐氧化、光催化氧化、O_(3)氧化法、超声波氧化和Fenton氧化)的研究现状和进展,并展望了高级氧化技术在处理含砷废水领域的发展方向。

The toxicity of arsenic is not only related to its content,but also depends on the form of arsenic.Arsenic has many valence states.Under natural conditions,arsenic is mainly positive trivalent and positive pentavalent.The toxicity of trivalent arsenic in inorganic arsenic is significantly higher than that of pentavalent arsenic.Its toxicity is about 30~60 times that of pentavalent arsenic,and pentavalent arsenic has stronger adsorption and stability.Therefore,As(Ⅲ)is mostly oxidized to As(Ⅴ)in the process,and then removed or further recycled.In this paper,The research status and progress of advanced oxidation methods of As(Ⅲ)in water(photocatalytic oxidation,electrocatalytic oxidation,O_(3) oxidation,ultrasonic oxidation and persulfate oxidation)were introduced.The development direction of advanced oxidation technology in the treatment of arsenic containing wastewater was prospected.