摘要
过一硫酸盐(PMS)的非均相活化技术,在废水处理领域表现出高效性。通过水热法成功制备了一种新型的复合催化剂Fe_(3)O_(4)/CoS/g-C_(3)N_(4),证实该催化剂具备光催化和PMS活化的双重功能,并应用于罗丹明B(RhB)的降解实验中。催化剂中的Co离子通过氧化还原循环作用,与PMS自分解产生的自由基协同作用,有效保持了Fe_(3)O_(4)/CoS/g-C_(3)N_(4)的催化降解性能,并在光照条件下进一步提升了降解效率。实验结果表明,在PMS/可见光的催化体系中,Fe_(3)O_(4)/CoS/g-C_(3)N_(4)在5 min内对10 mg/L RhB溶液的降解效率达97.5%,并且该催化剂具有较宽的pH适应性,在pH值为3至11的范围内均表现出良好的降解性能。另外,由于引入Fe_(3)O_(4),让该催化剂还具备优异的磁性回收特性,这使得它在实际应用具有很大的应用潜力。
Introduction Rhodamine B(RhB)as a widely used organic dye often appears in industrial wastewater,posing a serious threat to human health.In response to this problem,an advanced persulfate oxidation technology can effectively remove organic pollutants by virtue of its highly activated free radicals,having a great potential for application in the field of wastewater treatment due to its significant advantages of easy operation and wide pH range.In the Fenton system,transition group metals show superior performance,especially the cobalt(II)/potassium peroxymonosulfate(PMS)system,whose activation performance is particularly outstanding,and can efficiently degrade harmful substances in wastewater.However,the direct utilization of substances derived from Prussian blue analogs results in severe leaching of metal ions.Therefore,in this study,we prepared Fe_(3)O_(4)/CoS/g-C_(3)N_(4)composite catalysts by a hydrothermal method for the degradation of rhodamine B by photo-Fenton reaction.The effects of their structure,morphology and catalytic conditions on the performance were investigated.In addition,the preparation conditions and reaction parameters were also optimized.Methods An appropriate amount of Fe_(3)O_(4)/CoS/g-C_(3)N_(4)catalyst(with a mass concentration of 35–65 mg/L)was added into 100 m L RhB solutions at different mass concentrations(i.e.,10–30 mg/L).Under dark conditions,the mixed suspension was stirred in a magnetic stirrer for 30 min to achieve the equilibrium of adsorption and desorption.After equilibrium,an xenon lamp was turned on and a specified amount of PMS(with a mass concentration of 60–90 mg/L)was added.During the reaction,the sample was taken once per minute.The supernatant was obtained by centrifugation.The absorbance of RhB was determined by an ultraviolet-visible spectrophotometer.After the reaction was completed,the catalyst collected using a magnet was rinsed with deionized water for several times,and dried for cycle experiments.Results and Discussion In the PMS+Vis system,the degradatio
作者
郑佳红
黄植
ZHENG Jiahong;HUANG Zhi(School of Materials Science and Engineering,Chang'an University,Xi'an 710061,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2024年第12期3748-3760,共13页
Journal of The Chinese Ceramic Society
基金
陕西省重点研发项目(S2024-YF-YBGY-0137)
长安大学中央高校基本科研业务费专项资金资助(300102312405,300102312406)
大学生创新创业计划训练项目(S202410710350,X202410710588)。
关键词
普鲁士蓝类似物
罗丹明B
四氧化三铁
硫化钴
石墨相氮化碳
prussian blue analogs
Rhodamine B
ferrosoferric oxide
cobaltous sulfide
graphite carbon nitride
