摘要
制备了铁酸钴-氧化铝(CoFe_(2)O_(4)-Al_(2)O_(3))复合材料,并采用扫描电子显微镜(SEM)、X射线衍射(XRD)、比表面积和孔径分析仪对多孔CoFe_(2)O_(4)-Al_(2)O_(3)复合材料的物相和形貌进行了分析.利用制备的CoFe_(2)O_(4)-Al_(2)O_(3)复合材料活化过硫酸氢钾(PMS)来降解废水溶液中的日落黄(SY),通过研究CoFe_(2)O_(4)-Al_(2)O_(3)材料制备过程中Co^(2+),Fe^(3+)和Al^(3+)的物质的量之比、煅烧温度和时长对材料催化性能的影响,发现Co^(2+),Fe^(3+)和Al^(3+)的最佳物质的量之比为1∶2∶12,最佳煅烧温度为400℃和最佳煅烧时长为3 h.对采用在最优条件下制得的CoFe_(2)O_(4)-Al_(2)O_(3)复合材料作为催化剂,PMS氧化降解含日落黄废水进行研究,考察了pH值、温度、不同体系、PMS用量、CoFe_(2)O_(4)-Al_(2)O_(3)材料用量和一些阴离子对日落黄降解的影响.结果表明:在pH=7,温度为55℃条件下,用0.1 g催化剂和0.125 g PMS能使100 mL质量浓度为0.6 g·L^(-1)的日落黄溶液在30 min内降解率达到99.5%.同时,碳酸氢根负离子(HCO3-)和硝酸根负离子(NO_(3)^(-))的加入抑制了日落黄的降解,而Cl^(-)则能促进日落黄的降解.此外,在进行4次循环使用后,CoFe_(2)O_(4)-Al_(2)O_(3)仍表现出很好的催化性能,日落黄去除效果仍能达到90%以上.
In this study,cobalt ferrite-alumina(CoFe_(2)O_(4)-Al_(2)O_(3))composite was successfully prepared.The phase and morphology of the porous CoFe_(2)O_(4)-Al_(2)O_(3)composite were characterized by using scanning electron microspcope(SEM),X-ray diffraction(XRD),specific surface area and pore size analyzer.Then,the as-prepared CoFe_(2)O_(4)-Al_(2)O_(3)composite was used to activate potassium monopersulfate(PMS)to degrade the sunset yellow(SY)in wastewater solution.The effects of the molar ratios of Co^(2+),Fe^(3+),and Al^(3+),calcination temperature,and time on the catalytic performance of the material during the preparation process of CoFe_(2)O_(4)-Al_(2)O_(3)were studied.It was found that the optimal molar ratio of Co^(2+),Fe^(3+),and Al^(3+)was 1∶2∶12,the optimal calcination temperature was 400℃,and the optimal calcination time was 3 h.The CoFe_(2)O_(4)-Al_(2)O_(3)composite obtained under the optimal conditions was used as a catalyst to study the oxidative degradation of sunset yellow wastewater by PMS.The effects of pH value,temperature,different systems,PMS dosage,CoFe_(2)O_(4)-Al_(2)O_(3)dosage,and some anions on the degradation of sunset yellow were investigated.The results showed that under the conditions of pH=7 and 55℃,the degradation ratio of 100 mL of sunset yellow solution with a mass concentration of 0.6 g·L^(-1)could reach 99.5%within 30 min using 0.1 g catalyst and 0.125 g PMS.Meanwhile,the addition of bicarbonate anion(HCO_(3)^(-))and nitrate anion(NO_(3)^(-))inhibited the degradation of sunset yellow,while Cl^(-)promoted its degradation.In addition,after four cycles of use,CoFe_(2)O_(4)-Al_(2)O_(3)still exhibits good catalytic performance,and the removal effect of sunset yellow can still reach over 90%.
作者
尹大川
刘嘉润
何怡静
乔宇
梁杰
YIN Dachuan;LIU Jiarun;HE Yijing;QIAO Yu;LIANG Jie(College of Chemistry and Materials Science,Shanghai Normal University,Shanghai 200234,China)
