Elements Of X Ray Diffraction

Recent developments of zinc oxide based photocatalyst in water treatment technology: A review

Review on the criteria anticipated for the fabrication of highly efficient ZnO-based visible-light-driven photocatalysts

Comparison of modification strategies towards enhanced charge carrier separation and photocatalytic degradation activity of metal oxide semiconductors (TiO2, WO3 and ZnO)

Graphitic carbon nitride (g-C3N4) has gained remarkable acceptance as a visible-light-driven photocatalyst with a distinctive 2D structure and great stability. Owing to its superior features, g-C3N4 has been engaged in various scientific activities for environmental pollution abatement, production and storage of energy, and gas sensors. However, the visible-light efficiency of pure g-C3N4 is very poor and its separation from the phototreated systems is difficult. The most promising method to improve the photocatalytic activity and facilitate separation process is to introduce a magnetic compound over the g-C3N4 sheets. This review has mainly focused on the recent advancement in fabrication, characterization and application of magnetic g-C3N4-based nanocomposites. Accordingly, four primary g-C3N4-based nanocomposites are discussed based on the type of integrated magnetic material. The effects on the structure, physico-chemical properties, photocatalytic activity towards degradation of pollutants, hydrogen generation, solid phase extraction, lithium-ion batteries, gas sensors, and supercapacitors are also discussed in detail.

Review on magnetically separable graphitic carbon nitride-based nanocomposites as promising visible-light-driven photocatalysts

In this work, plasmonic ternary ZnO/Ag/Ag2WO4 nanocomposites as efficient visible-light-driven photocatalysts prepared by a facile ultrasonic-irradiation method. The as-prepared samples were characterized by XRD, SEM, TEM, EDX, XPS, UV–vis DRS, FT-IR, and PL techniques. The photocatalytic performance of the prepared ZnO/Ag/Ag2WO4 nanocomposites were evaluated by photodegradations of rhodamine B, methylene blue, methyl orange, and fuchsine under visible-light irradiation. The optimal nanocomposite with 15 wt% of Ag/Ag2WO4 to ZnO showed the highest photocatalytic activity for RhB degradation, which is about 95 and 19 times higher than those of the Ag/Ag2WO4 and ZnO samples, respectively. The highly enhanced activity of the ZnO/Ag/Ag2WO4 (15%) nanocomposite was attributed to the surface plasmon resonance effect of metallic silver and the formation of heterojunctions between the counterparts, which effectively suppresses recombination of the photogenerated charge carriers. Lastly, the plasmon-enhanced photocatalytic mechanism associated with the ZnO/Ag/Ag2WO4 nanocomposites was discussed.

Ultrasonic-assisted preparation of plasmonic ZnO/Ag/Ag2WO4 nanocomposites with high visible-light photocatalytic performance for degradation of organic pollutants.

A facile route was adopted to fabricate p-n heterojunction ZnO/CoMoO4 photocatalysts through a refluxing method followed by calcination process. The resulting ZnO/CoMoO4 nanocomposites were characterized by means of XRD, EDX, FESEM, HRTEM, XPS, UV–vis DRS, FT-IR, BET, and PL techniques. The photocatalytic degradation of rhodamine B was chosen to investigate photocatalytic performances. Compared to the reference materials of ZnO and CoMoO4, the ZnO/CoMoO4 nanocomposites showed much higher photocatalytic activity and the ZnO/CoMoO4 (30%) sample possessed the highest efficiency, which is 19.6 and 6.26 folds greater relative to the ZnO and CoMoO4, respectively. The results demonstrated that the p-n heterojunction between ZnO and CoMoO4 could significantly boost the photocatalytic efficiency through highly promoted separation of electron/hole pairs as well as extended absorption to visible light. Finally, the highly enhanced performances of the ZnO/CoMoO4 (30%) nanocomposite in removal of three more organic pollutants including methylene blue, methyl orange, and fuchsine were confirmed, which indicates the potential of this nanocomposite for practical applications.

Facile fabrication of novel ZnO/CoMoO4 nanocomposites: Highly efficient visible-light-responsive photocatalysts in degradations of different contaminants

Mahsa Pirhashemi

Papers

Review on the criteria anticipated for the fabrication of highly efficient ZnO-based visible-light-driven photocatalysts

Ultrasonic-assisted preparation of plasmonic ZnO/Ag/Ag2WO4 nanocomposites with high visible-light photocatalytic performance for degradation of organic pollutants.

Facile fabrication of novel ZnO/CoMoO4 nanocomposites: Highly efficient visible-light-responsive photocatalysts in degradations of different contaminants

ZnO/NiWO 4 /Ag 2 CrO 4 nanocomposites with p-n-n heterojunctions: Highly improved activity for degradations of water contaminants under visible light

Photosensitization of ZnO by AgBr and Ag2CO3: Nanocomposites with tandem n-n heterojunctions and highly enhanced visible-light photocatalytic activity