【摘要】 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.更多还原

【Abstract】 Effects of SO2-4,HCO-3 and Cl-in mine water on performance of photocatalytic degradation of mine water CODCr with TiO2.After the anions in mine water were fully filtered with anion resin,simulant mine water samples with eath of Na2SO4,NaHCO3 and NaCl and composites between the 3 salts were respectively prepared,and photocatalytically degradated CODCr in mine water with homemade TiO2 under ultraviolet light irradiation.When they existed singly,all the three kinds of anions can decline the CODCr photocatalytic degradation rate in the order of HCO-3>SO2-4>Cl-,4.45 mmol/L Cl-accelerating CODCr degradation rate a little.When composites every two of the three kinds of anions,HCO-3 and SO2-4,HCO-3 and Cl-,as HCO-3 concentration is low,common effects of HCO-3,SO2-4 or Cl-lower CODCr degradation rate,while HCO-3 plays a major role;as HCO-3 is in high concentration,HCO-3 achieves absolute role.In composite experiment of SO24 and Cl-,Cl-concentration is 4.45 mmol/L,promoting CODCr degradation rate slightly in the range of concentrations of SO2-4;Cl-is higher than this concentration,Cl-and SO2-4 compositions have the synergy effect on lowering CODCr degradation rate,and are lower than that they exist individually.更多还原