Hydrazine-induced synthesis of CdS nanorings for the application in photodegradation

Abstract

In this paper, CdS nanorings synthesized by facile hydrazine-induced microwave method for the photodegradation of pollutants has been reported for the rst time. Different reaction method, microwave power, the category and dosage of pH regulating reagent, reaction temperature and reaction time were investigated. The formation of CdS nanorings from the self-assembly of nanoparticles was attributed to the coordination of hydrazine producing the dipole-dipole interaction among the uniform nanoparticles obtained by microwave method. The crystal phase, composition, morphology and surface property of CdS nanorings were characterized. The results showed that 100 nm-sized wurtzite CdS nanorings with positive surface charges formed by the self-assembly of 5-8 nm nanoparticles, which presented mesoporous structures with maximum pore size of 52 nm. To study the in uence of ring-like structures on the photocatalysis, the photodegradation of rhodamine B (RhB) by CdS nanorings and nanoparticles were compared. The results showed that, CdS nanorings displayed higher photodegradation e ciency, which were originated from favorable band edge potential and obviously more effective electron-hole separation producing more superoxide radical and holes as active speci es. The photodegradation path of RhB contains the process as the demethylation, the decarboxylation process, the chromophore cleavage and ring-open reactions. Finally, the available photodegradation of multiple pollutants and reusability of CdS nanorings were carried out.

Coupling Cu Coordination Polymers with CdS Forming an S-Scheme Heterojunction for Rapid Charge Separation and High Photocatalytic Activity

“…The result indicated that there was no clear adsorption saturation plateau, indicating an irregular pore structure for the three materials. Among these, CdS was assembled into nanochains with internal cavities, and the chains formed stacks with each other, 40 which facilitated the formation of additional pores. When the dosage of CdS was increased by 10 times, the BET surface area of Cu-CPs@ CdS-3 synthesized by the same method was significantly reduced to 20 m 2 •g −1 with a pore size of 18.98 nm (Figure S6).…”

Synthesis and Evaluation of Properties of an Additive Based on Bismuth Titanates for Cement Systems

“…In recent years, the variety of heterogeneous photocatalysts has been significantly expanded: there are a number of works aimed at studying the photocatalytic activity of titanium oxide doped with metal and nonmetal atoms [ 15 , 16 ]: for instance, the photocatalytic properties of pure and doped zinc oxide [ 17 , 18 ], nanoscale cadmium sulfide CdS [ 19 ], graphite-like carbon nitride [ 20 ], cerium oxide CeO 2 [ 21 ], CuO [ 22 ], BiOCl, SnO 2 , WO 3 [ 23 ] as well as composite photocatalysts Fe 3 O 4 /TiO 2 [ 24 ], CuBi 2 O 4 /polyaniline [ 25 ], BiFeO 3 -black TiO 2 [ 26 ], layered CuO/ZnO [ 27 ], Dy 2 WO 6 -ZnO [ 28 ] and In 2 O 3 /SnO 2 [ 29 ].…”