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环境化学

The effect of background constituents on the degradation of 2,4-D in aqueous solution by O₃/H₂O₂ process

摘要：重点考察了水中本底成分对O₃/H₂O₂高级氧化工艺去除水中微量农药2,4-D的影响规律.实验结果表明,自来水本底比蒸馏水本底更有利于水中2,4-D的去除;自由基捕获剂叔丁醇对于2,4-D的催化臭氧化反应具有比较明显的抑制作用,但是HCO₃^-却对水中2,4-D的氧化降解有一定的促进作用;一定浓度的腐殖酸对于2,4-D的催化臭氧化反应具有比较明显的促进作用,较高浓度的腐殖酸对于2,4-D的催化臭氧化反应具有明显的抑制作用;水中的Na⁺、K⁺、Mg²⁺、Ca²⁺、Cu²⁺、Zn²⁺在较低浓度时对2,4-D的降解没有明显影响,在高浓度时有一定的抑制作用;Co²⁺、Ni²⁺、Ca²⁺、Cr³⁺在较低浓度时对2,4-D的氧化降解有促进作用,高浓度时候有一定的抑制作用.

Abstract：The effect of background constituents on the degradation of the pesticide 2,4-D (2,4-Dichlorophenoxyacetic acid) by O₃/H₂O₂ process was investigated. The experimental results showed a better removal efficiency for 2,4-Din tap water than in distilled water. Tert-butanol, a typical free radical inhibitor, significantly decreased the removal rate of 2,4-D. However, HCO₃^-, usually an inhibitor present in natural water, enhanced the removal of 2,4-Dover a certain range. In addition, a certain concentration of humic acid enhanced the removal of 2,4-Dfrom the water, although high doses of humic acid decreased the 2,4-Dremoval efficiency by O₃/H₂O₂ oxidation. Certain metal ions in the water such as Na⁺、K⁺、Mg²⁺、Ca²⁺、Cu²⁺、Zn²⁺ had no significant influence toward the removal of 2,4-Dfrom water at low concentrations. However, the efficiency of the O₃/H₂O₂ oxidation process was decreased when high concentrations of these ions were present. Other metal ions such as cobalt/nickel/cadmium/chromium could enhance the removal of 2,4-Dfrom the water at low concentrations. However, the efficiency of O₃/H₂O₂ oxidation process was decreased by high Co²⁺、Ni²⁺、Ca²⁺、Cr³⁺.