研究报告
胡昊,潘顺龙,聂溪,郭鑫瑞,张永军.CoFe2O4的制备及其对有机膦酸的去除性能研究[J].环境科学学报,2022,42(8):156-165
CoFe2O4的制备及其对有机膦酸的去除性能研究
- Preparation of CoFe2O4 as catalyst for the removal of phosphonates
- 基金项目:国家自然科学基金青年基金项目(No.52000102);江苏省自然科学基金(No.BK20190689)
- 胡昊
- 南京工业大学环境科学与工程学院,南京 211816
- 潘顺龙
- 南京工业大学环境科学与工程学院,南京 211816;河海大学环境学院,南京 210098
- 聂溪
- 南京工业大学环境科学与工程学院,南京 211816
- 郭鑫瑞
- 南京工业大学环境科学与工程学院,南京 211816
- 张永军
- 南京工业大学环境科学与工程学院,南京 211816
- 摘要:采用水热法制备CoFe2O4作为催化剂,降解氨基三亚甲基膦(NTMP),并通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)等表征方法对催化剂的结构、形貌进行表征.同时,系统研究了不同pH、过硫酸盐浓度、NTMP浓度、共存离子等因素对其催化过硫酸盐氧化降解有机磷的 影响.结果表明,本研究成功合成了CoFe2O4催化剂.NTMP降解率随着催化剂投加量、过硫酸氢钾(PMS)浓度的增加而增大,随着初始NTMP浓度的增加而减小.弱酸性条件有利于反应活化PMS降解NTMP,而中性或碱性条件都会减缓催化反应的进行.CoFe2O4/PMS体系对NTMP的降解率最多达90.3%.不同阴离子对催化反应的影响不同,溶液中NO3 、SO42-对反应的抑制作用不明显,Cl-会对反应产生轻微的抑制作用,而HCO3-的出现大大抑制了催化剂的催化性能.催化剂具有良好的稳定性,5次循环后仍能在30 min之内降解86.0%的NTMP.此外,捕获实验和EPR测试结果表明,CoFe2O4/PMS 催化体系中活性物种分别为SO4·-、·OH和1O2 .
- Abstract:CoFe2O4 was prepared as catalyst by hydrothermal method to degrade nitrilotrimethylene triphosphonic acid (NTMP). At first, the structure and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and other characterization methods, which showed that CoFe2O4 was synthesized successfully. Then, the influence of pH, persulfate concentration, NTMP concentration, and coexisting ions on the degradation of phosphonates by persulfate oxidation was studied systematically. The degradation rate of NTMP ascended with the increase of catalyst dosage and potassium peroxymonosulfate(PMS) concentration, and declined with the increase of initial NTMP concentration. Weak acidic environment is favored by the degradation of NTMP through activation of PMS, while neutral or alkaline environment will slow down the catalytic reaction. The degradation rate of NTMP in CoFe2O4/PMS system could arrive up to 90.3%. Different anions have different influences on the catalytic reaction. NO3- and SO42- in the solution have no obvious inhibitory effect on the reaction, Cl- has slight inhibitory effect, while HCO3- greatly inhibits its catalytic performance. The catalyst showed good stability, which could degrade 86.0% NTMP within 30 min after 5 cycles. Finally, the capture experiment and EPR test results showed that the active species in the CoFe2O4/PMS catalytic system were SO4·-, ·OH and 1O2.