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探讨SO42-,HCO3-和Cl-对TiO2光催化降解矿井水的化学耗氧量(用Cr法测)(CODCr)性能的影响.用阴离子树脂充分过滤掉矿井水中阴离子,将Na2SO4,NaHCO3和NaCl分别配成在矿井水中单一存在的溶液和复合存在的溶液,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,它们均使光催化CODCr的降解率下降,影响大小依次是HCO3->SO42->Cl-;当3种离子两两复合时,在HCO3-分别与SO42-和Cl-的复合实验中,当HCO3-浓度较低时,HCO3-和SO42-或Cl-共同影响使CODCr降解率下降,HCO3-起主要作用;当HCO3-浓度较高时,HCO3-起主要作用.在SO24-和Cl-的复合实验中,Cl-浓度为4.45 mmol/L,可轻微促进CODCr降解率的提高,当Cl-浓度高于此浓度时,Cl-和SO42-有协同作用并使CODCr降解率下降,且降解率均低于Cl-和SO42-单独存在时的降解率.
The effect of SO42-, HCO3- and Cl- on the chemical oxygen demand (CODCr) of TiO2 photocatalytic degradation of mine water was investigated. Anion resin was used to filter out the anions in mine water and Na2SO4, NaHCO3 and NaCl The photocatalytic degradation of CODCr in mine water was carried out using self-made TiO2 under the irradiation of ultraviolet lamp, respectively, all of which reduced the degradation rate of photocatalytic CODCr , Followed by the order of HCO3-> SO42-> Cl-; when the three kinds of ions were combined in two by two, in the composite experiment of HCO3- and SO42- and Cl- respectively, when the concentration of HCO3- was lower, HCO3- and SO42 HCO3- plays a major role in the degradation of CODCr with the combined effect of Cl- or Cl-, and HCO3- plays a major role when the concentration of HCO3- is higher. In the combined experiment of SO24- and Cl-, the Cl- concentration is 4.45 mmol / L, the degradation rate of CODCr can be slightly improved. When the Cl- concentration is higher than this concentration, Cl- and SO42- have a synergistic effect and the degradation rate of CODCr decreases, and the degradation rate is lower than that of Cl- and SO42- alone The degradation rate.