磁性生物炭催化过一硫酸盐降解橙黄Ⅱ

Degradation of OrangeⅡby PMS activated with magnetic biochar

利用沉淀法制备了磁性生物炭(MBC),采用扫描电镜(SEM)、X射线衍射仪(XRD)、傅立叶红外光谱仪(FTIR)和比表面积分析仪(BET)对制备的MBC进行了表征,并用其催化过一硫酸盐(PMS)降解水中橙黄Ⅱ,考察了初始橙黄Ⅱ浓度、PMS浓度、MBC投加量、溶液初始pH和温度对降解效果的影响。结果表明,当初始橙黄Ⅱ质量浓度为20 mg/L,溶液初始pH为7,温度为25℃,MBC投加量为0.3 g/L,PMS质量浓度为0.4 g/L时,反应90 min后橙黄Ⅱ降解率可达98.4%。橙黄Ⅱ的降解率随MBC投加量、溶液初始pH和温度的升高而提高。Cl^(-)、HA、HCO_(3)^(-)和NO_(3)^(-)对降解效果有一定的抑制。自由基猝灭实验结果表明,MBC/PMS体系中的主要氧化物种为^(1)O_(2)和‧OH。MBC经过4次循环使用后,橙黄Ⅱ降解率仍可达到39.1%。

Magnetic biochar was prepared by precipitation method and characterized by SEM,XRD,FTIR and BET.The degradation of OrangeⅡby PMS activated by MBC was studied.The effects of OrangeⅡconcentration,PMS concentration,MBC dosage,initial solution pH and temperature on degradation effect were investigated.Results showed that under conditions such as initial solution pH 7,0.3 g/L MBC,0.4 g/L PMS,the degradation efficiency of 20 g/L OrangeⅡcould reach 98.4%within 90 min at 25℃.The degradation efficiency increased with MBC dosage,initial solution pH and temperature.Cl^(-),HCO_(3)^(-),NO_(3)^(-) and HA had negative effect on the degradation.Quenching ex⁃periments revealed that the main oxidant species in the MBC/PMS system were ^(1)O_(2) and ‧OH.After 4 runs,the degra⁃dation efficiency of OrangeⅡcould reach 39.1%.