CoFe_(2)O_(4)的制备及其对有机膦酸的去除性能研究  

Preparation of CoFe_(2)O_(4) as catalyst for the removal of phosphonates

作　　者：胡昊 潘顺龙 聂溪 郭鑫瑞 张永军 HU Hao;PAN Shunlong;NIE Xi;GUO Xinrui;ZHANG Yongjun(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816;College of Environment,Hohai University,Nanjing 210098)

机构地区：[1]南京工业大学环境科学与工程学院,南京211816 [2]河海大学环境学院,南京210098

出　　处：《环境科学学报》2022年第8期156-165,共10页Acta Scientiae Circumstantiae

基　　金：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)。

摘　　要：采用水热法制备CoFe_(2)O_(4)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CoFe_(2)O_(4)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.CoFe_(2)O_(4)/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NO_(3)、SO_(4)^(2-)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HCO_(3)-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,CoFe_(2)O_(4)/PMS催化体系中活性物种分别为SO_(4)^(·-)、·OH和^(1)O_(2).CoFe_(2)O_(4) 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 CoFe_(2)O_(4) 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 CoFe_(2)O_(4)/PMS system could arrive up to 90.3%.Different anions have different influences on the catalytic reaction.NO_(3)^(-) and SO_(4)^(2-) in the solution have no obvious inhibitory effect on the reaction,Cl-has slight inhibitory effect,while HCO_(3)^(-)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 CoFe_(2)O_(4)/PMS catalytic system were SO_(4)^(·-),·OH and ^(1)O_(2).

关 键 词：水热法 CoFe_(2)O_(4) 有机膦酸 氨基三亚甲基膦(NTMP) 过硫酸氢钾(PMS) 氧化降解 

分 类 号：X703[环境科学与工程—环境工程]