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UV/H_2O_2对土壤中As(Ⅲ)氧化效果的初步研究
doi: 10.13205/j.hjgc.201505036
EFFECT OF UV/H2O2 ON OXIDATION PERFORMANCE OF AS( Ⅲ) IN SOIL
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摘要: 为了减弱As迁移能力,降低其毒性,将土壤中As(Ⅲ)氧化为As(Ⅴ),使其更容易被固定。通过人工模拟的受砷污染土壤研究了自然光、紫外线、H2O2、自然光+H2O2和紫外线+H2O2对As(Ⅲ)的氧化效果。结果表明:5个组合均能氧化As(Ⅲ),紫外线+H2O2组合氧化效果最好,在此基础上通过正交试验确定该组合对As(Ⅲ)氧化的最优操作条件。UVC波段的紫外线氧化效果最好;光照强度12 W、光照时间为6 h时,氧化效果较好,继续增加光照强度和光照时间氧化效果没有明显提高;H2O2投加量为20 m L/kg时氧化效果最好,且继续增加投加量,氧化效果仍能改善。Abstract: The paper oxidized As( Ⅲ) to As( Ⅴ) in soil to make it easy to be solidified，minimizing its migration and toxicity．Nature light，UV，H2O2 ，nature light + H2O2 and UV + H2O2 were used as the oxidizing agents applying to simulating polluting soil． The results showed that all of them could oxidize As( Ⅲ) and UV + H2O2 had the best performance． Orthogonal test was carried out to get the optimum oxidizing conditions． The results showed that: UVC was best efficient; when the light intensity of 12 W and exposure time of 6 h，the oxidizing result was fine; the degree of oxidation didn' t improve with the increase of the light intensity and exposure time; H2O2 dosage of 20 mL/kg could reach an ideal effect and the degree of oxidation increased with the dosage of H2O2 ．
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