在超声条件下通过置换反应制备钯海绵铁(Pd0-s-Fe0)双金属颗粒,采用扫描电子显微镜(SEM)和电子能谱仪(EDS)进行表征.Pd0-s-Fe0催化还原降解溶液中的四溴双酚A(TBBPA)的实验结果表明,pd0-s-Fe0较s-Fe0(海绵铁)催化活性高,在pH值为6.7,100 mL初始浓度为15 mg·L-1溶液投加5 g负载0.07％钯的改性海绵铁的条件下,反应120 min后TBBPA的去除率达到91.5％,且pd0-s-Fe0降解TBBPA符合一级动力学规律.经高效液相色谱串联四极杆飞行时间质谱(LC-TOF-MS)分析鉴定降解产物,明确TBBPA的还原降解途径为TBBPA被脱去1-4个溴生成三溴双酚A、二溴双酚A、一溴双酚A、双酚A.
Pd0-s-Fe0 bimetallic particles were synthesized by liquid phase reductive displacement method under ultrasound and characterized by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS).The results of the tetrabromobisphenol A degradation (TBBPA) by Pd0-s-Fe0 indicated that Pd0-s-Fe0 showed better catalytic activity compared with s-Fe0.At pH 6.7,with 5 g Pd0-s-Fe0 particles in 100 mL 15 mg-L-1 TBBPA solution,the degradation efficiency of TBBPA reached 91.5％,and the reaction obeyed the pseudo first-order kinetics.Through identification of the major degradation intermediates by liquid chromatography time-of-flight mass spectrometry (LC/TOF/MS),the degradation pathway of TBBPA was through debromination of 1-4 Br atoms to produce tri-BBPA,di-BBPA,mono-BBPA and BPA.
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