制备了铁酸钴-氧化铝(CoFe2O4-Al2O3)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CoFe2O4-Al2O3复合材料的物相和形貌进行了分析.利用制备的CoFe2O4-Al2O3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CoFe2O4-Al2O3材料制备过程中Co2+,Fe3+和Al3+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Co2+,Fe3+和Al3+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CoFe2O4-Al2O3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、CoFe2O4-Al2O3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(NO3-)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,CoFe2O4-Al2 O3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.
Preparation of CoFe2O4-Al2O3 composite material and its application in the treatment of wastewater containing sunset yellow
In this study,cobalt ferrite-alumina(CoFe2O4-Al2O3)composite was successfully prepared.The phase and morphology of the porous CoFe2O4-Al2O3 composite were characterized by using scanning electron microspcope(SEM),X-ray diffraction(XRD),specific surface area and pore size analyzer.Then,the as-prepared CoFe2O4-Al2O3 composite was used to activate potassium monopersulfate(PMS)to degrade the sunset yellow(SY)in wastewater solution.The effects of the molar ratios of Co2+,Fe3+,and Al3+,calcination temperature,and time on the catalytic performance of the material during the preparation process of CoFe2O4-Al2O3 were studied.It was found that the optimal molar ratio of Co2+,Fe3+,and Al3+ was 1∶2∶12,the optimal calcination temperature was 400℃,and the optimal calcination time was 3 h.The CoFe2O4-Al2O3 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,CoFe2O4-Al2O3 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(HCO3-)and nitrate anion(NO3-)inhibited the degradation of sunset yellow,while Cl-promoted its degradation.In addition,after four cycles of use,CoFe2O4-Al2O3 still exhibits good catalytic performance,and the removal effect of sunset yellow can still reach over 90%.
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