以片状g-C3N4、六水三氯化铁、柠檬酸三钠和尿素为原料,聚丙烯酰胺为稳定剂,采用水热法制备Fe3O4/g-C3N4复合材料并作为过硫酸钠(PS)降解罗丹明B(RhB)的活化剂。通过XRD、SEM、EDS、FT-IR对样品结构、形貌与组成进行表征。考察Fe3O4与g-...以片状g-C3N4、六水三氯化铁、柠檬酸三钠和尿素为原料,聚丙烯酰胺为稳定剂,采用水热法制备Fe3O4/g-C3N4复合材料并作为过硫酸钠(PS)降解罗丹明B(RhB)的活化剂。通过XRD、SEM、EDS、FT-IR对样品结构、形貌与组成进行表征。考察Fe3O4与g-C3N4的质量比、活化剂质量、PS质量、溶液pH等对Fe3O4/g-C3N4活化PS降解RhB效果的影响。结果表明,与g-C3N4复合有效提高了Fe3O4的分散性和活化性能;在Fe3O4与g-C3N4质量比为3∶4、Fe3O4/g-C3N4质量为50 mg、PS质量为20 mg、RhB溶液pH为2.1时,反应120 min RhB的降解率达到100%。Fe3O4/g-C3N4可用磁铁进行分离回收,循环使用5次,活化PS去除RhB降解率仍达95.5%。展开更多
We prepared the Fe3O4/g‐C3N4nanoparticles(NPs)through a simple electrostatic self‐assembly method with a3:97weight ratio to investigate their Fenton,photo‐Fenton and oxidative functionalities besides photocatalytic...We prepared the Fe3O4/g‐C3N4nanoparticles(NPs)through a simple electrostatic self‐assembly method with a3:97weight ratio to investigate their Fenton,photo‐Fenton and oxidative functionalities besides photocatalytic functionality.We observed an improvement of the Fenton and photo‐Fenton activities of the Fe3O4/g‐C3N4nanocomposites.This improvement was attributed to efficient charge transfer between Fe3O4and g‐C3N4at the heterojunctions,inhibition of electron‐hole recombination,a high surface area,and stabilization of Fe3O4against leaching by the hydrophobic g‐C3N4.The obtained NPs showed a higher degradation potential for rhodamine B(RhB)dye than those of Fe3O4and g‐C3N4.As compared to photocatalysis,the efficiency of RhB degradation in the Fenton and photo‐Fenton reactions was increased by20%and90%,respectively.Additionally,the horseradish peroxidase(HRP)activity of the prepared nanomaterials was studied with3,3,5,5‐tetramethylbenzidinedihydrochloride(TMB)as a substrate.Dopamine oxidation was also examined.Results indicate that Fe3O4/g‐C3N4nanocomposites offers more efficient degradation of RhB dye in a photo‐Fenton system compared with regular photocatalytic degradation,which requires a long time.Our study also confirmed that Fe3O4/g‐C3N4nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB.These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.展开更多
The g-C3 N4/Fe3 O4/MnWO4 nanocomposites were prepared by a refluxing-calcination procedure. Visiblelight-induced photocatalytic experiments showed that the g-C3 N4/Fe3 O4/MnWO4（10%） nanocomposite has excellent abili...The g-C3 N4/Fe3 O4/MnWO4 nanocomposites were prepared by a refluxing-calcination procedure. Visiblelight-induced photocatalytic experiments showed that the g-C3 N4/Fe3 O4/MnWO4（10%） nanocomposite has excellent ability to degrade a range of contaminants including rhodamine B, methylene blue, methyl orange, and fuchsine, which is about 7, 10, 25, and 31 times of the g-C3 N4 photocatalyst, respectively.Reactive species trapping experiments revealed that superoxide anion radicals play major role in the photodegradation reaction of rhodamine B（RhB）. After the treatment process, the utilized photocatalyst was magnetically recovered and reused with negligible loss in the photocatalytic activity, which is vital in the photocatalytic processes. Finally, a mechanism was proposed for the enhanced interfacial carrier separation and transfer and the improved photocatalytic performance.展开更多
文摘以片状g-C3N4、六水三氯化铁、柠檬酸三钠和尿素为原料,聚丙烯酰胺为稳定剂,采用水热法制备Fe3O4/g-C3N4复合材料并作为过硫酸钠(PS)降解罗丹明B(RhB)的活化剂。通过XRD、SEM、EDS、FT-IR对样品结构、形貌与组成进行表征。考察Fe3O4与g-C3N4的质量比、活化剂质量、PS质量、溶液pH等对Fe3O4/g-C3N4活化PS降解RhB效果的影响。结果表明,与g-C3N4复合有效提高了Fe3O4的分散性和活化性能;在Fe3O4与g-C3N4质量比为3∶4、Fe3O4/g-C3N4质量为50 mg、PS质量为20 mg、RhB溶液pH为2.1时,反应120 min RhB的降解率达到100%。Fe3O4/g-C3N4可用磁铁进行分离回收,循环使用5次,活化PS去除RhB降解率仍达95.5%。
基金supported by the National Natural Science Foundation of China(51572253,21771171)Scientific Research Grant of Hefei Science Center of CAS(2015SRG-HSC048)+1 种基金cooperation between NSFC and Netherlands Organization for Scientific Research(51561135011)CAS-TWAS Scholarship Program~~
文摘We prepared the Fe3O4/g‐C3N4nanoparticles(NPs)through a simple electrostatic self‐assembly method with a3:97weight ratio to investigate their Fenton,photo‐Fenton and oxidative functionalities besides photocatalytic functionality.We observed an improvement of the Fenton and photo‐Fenton activities of the Fe3O4/g‐C3N4nanocomposites.This improvement was attributed to efficient charge transfer between Fe3O4and g‐C3N4at the heterojunctions,inhibition of electron‐hole recombination,a high surface area,and stabilization of Fe3O4against leaching by the hydrophobic g‐C3N4.The obtained NPs showed a higher degradation potential for rhodamine B(RhB)dye than those of Fe3O4and g‐C3N4.As compared to photocatalysis,the efficiency of RhB degradation in the Fenton and photo‐Fenton reactions was increased by20%and90%,respectively.Additionally,the horseradish peroxidase(HRP)activity of the prepared nanomaterials was studied with3,3,5,5‐tetramethylbenzidinedihydrochloride(TMB)as a substrate.Dopamine oxidation was also examined.Results indicate that Fe3O4/g‐C3N4nanocomposites offers more efficient degradation of RhB dye in a photo‐Fenton system compared with regular photocatalytic degradation,which requires a long time.Our study also confirmed that Fe3O4/g‐C3N4nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB.These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.
基金the financial support from University of Mohaghegh Ardabili
文摘The g-C3 N4/Fe3 O4/MnWO4 nanocomposites were prepared by a refluxing-calcination procedure. Visiblelight-induced photocatalytic experiments showed that the g-C3 N4/Fe3 O4/MnWO4（10%） nanocomposite has excellent ability to degrade a range of contaminants including rhodamine B, methylene blue, methyl orange, and fuchsine, which is about 7, 10, 25, and 31 times of the g-C3 N4 photocatalyst, respectively.Reactive species trapping experiments revealed that superoxide anion radicals play major role in the photodegradation reaction of rhodamine B（RhB）. After the treatment process, the utilized photocatalyst was magnetically recovered and reused with negligible loss in the photocatalytic activity, which is vital in the photocatalytic processes. Finally, a mechanism was proposed for the enhanced interfacial carrier separation and transfer and the improved photocatalytic performance.
