探讨矿井水中SO2-4, HCO-3和Cl-对TiO2光催化降解矿井水化学需氧量-铬法(CODcr)性能的影响. 用阴离子树脂充分过滤掉矿井水中阴离子, 再用Na2SO4, NaHCO3和NaCl分别配制其在矿井水中单一存在的浓度, 使用自制的TiO2在紫外灯照射下光催化降解矿井水中CODcr. 当3种离子单独存在时, 它们均能使光催化CODcr的降解率下降, 影响大小依次是HCO-3＞SO2-4＞Cl-, 在Cl-为低浓度4.45 mmol·L-1对CODcr降解率有轻微促进作用. 采用 Langmuir-Hinshelwood机制分别研究了矿井水CODcr在SO2-4, HCO-3 和Cl-离子单独存时的光催化降解动力学, 降解模式符合准一级反应动力学方程. 在pH 7.9～8.7和辐照强度为紫外光辐照强度70 μW·cm-2条件下, 含HCO-3矿井水的Kr为31.45 mmol·L-1·min-1, Kb为0.56 L·mmol-1;含SO2-4矿井水的Kr为37.31 mmol·L-1·min-1, Kb为0.779 L·mmol-1;含Cl-矿井水的Kr为39.68 mmol·L-1·min-1, Kb为0.739 L·mmol-1.
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