P-n heterostructured TiO2/NiO double-shelled hollow spheres for the photocatalytic degradation of papermaking wastewater

Journal Article · Wed Nov 14 23:00:00 EST 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.08.016· OSTI ID:22805323

Wang, Haiqing; Gong, Qinghua; Huang, Hui; Gao, Tingting; Yuan, Zaiwu; Zhou, Guowei ^[1]

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1. Key Laboratory of Fine Chemicals in Universities of Shandong, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353 (China)

Highlights: • P-n heterostructured TiO{sub 2}/NiO double-shelled hollow spheres were prepared. • A cubic-structured NiO layer is grown on surface of anatase TiO{sub 2} hollow sphere. • TiO{sub 2}/NiO show high photocatalytic activity for papermaking wastewater degradation. • The COD{sub Cr} removal rate of wastewater reaches 98.1% after 6 h of photodegradation. - Abstract: P-n heterostructured TiO{sub 2}/NiO double-shelled hollow spheres were prepared through sol–gel and hydrothermal processes. TiO{sub 2}/NiO nanomaterials were comprehensively characterized, and the results reveal that a cubic-structured NiO layer is successfully grown on the surface of the anatase TiO{sub 2} hollow sphere to achieve a p-n heterostructure. The thickness of TiO{sub 2} shell is ∼20 nm, and that of NiO shell is 10–25 nm. Compared with the pure TiO{sub 2} hollow spheres, the prepared p-n heterostructures display a considerably higher photocatalytic activity for papermaking wastewater degradation under UV light irradiation. The chemical oxygen demand removal rate of papermaking wastewater reaches 98.1% after 6 h of photodegradation with DSTN2 as the photocatalyst. The enhanced photocatalytic activity is due to the synergetic effects of p-n heterostructures and the large specific surface area of the catalyst; these effects may promote the separation of photogenerated electron–hole pairs.

• OSTI ID: 22805323
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 107; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CATALYSTS
CHEMICAL OXYGEN DEMAND
ELECTRON-HOLE COUPLING
NICKEL OXIDES
P-N JUNCTIONS
PHOTOCATALYSIS
RADIATION EFFECTS
SOL-GEL PROCESS
SPECIFIC SURFACE AREA
SPHERES
TITANIUM OXIDES
ULTRAVIOLET RADIATION
WASTE WATER