Preparation of nano-ZnO and its photocatalytic degradation of dyeing wastewater

Lijuan, Wang; LI, Xiaoning; CHEN, Aiwu; Wang, Ying; JIANG, Butao

doi:10.3724/sp.j.1249.2019.04367

Cited by 1 publication

(1 citation statement)

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“…From the results of photocatalytic activity, it can be seen that the crystallinity and grain size of nano-ZnO directly determine its catalytic activity. Although the specific surface area of nano-ZnO calcined at 300℃ and 350℃ are larger, there are too many defects in nano-ZnO catalyst because of its poor crystallinity, which may become the composite center of photo generated carriers [31][32][33][34][35][36][37][38], and lead to the reduction of quantum efficiency and the reduction of photocatalytic performance. Although the crystallinity of nano-ZnO calcined at 450℃ and 500℃ are better than that of at 400℃, their nano-ZnO grain sizes are larger and those larger particals agglomeration are more serious, which lead to the decrease of the porosity and specific surface area of nano-ZnO catalyst, and the decrease of the contact area between the surface of catalyst and methylene blue liquid, thus affects their photocatalytic performance.…”

Section: Analysis Of Photocatalytic Propertiesmentioning

confidence: 99%

Preparation of Photocatalytic Porous Nano-ZnO from Galvanizing Dross

Xie

Yang

et al. 2019

SSP

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By using an acid free wet chemical method, porous nano-ZnO with high photocatalytic performance was synthesized from galvanizing dross at room temperature. The route is an environmental way to realize high value conversion and reuse of galvanizing dross. X-ray diffraction, microstructure, electron diffraction and specific surface area analyses show, the prepared porous nano-ZnOs are hexagonal wurtzite structure ZnO strips. The strips are consist of ZnO nanoparticles, the strips growth direction is perpendicularly to the C axis when the calcination temperature is up to 350°C. With the increase of calcination temperature, the specific surface area of ZnO decreases and the crystallinity increases. The photocatalytic activity of nano-ZnO is related to its crystallinity and grain size. When the calcination temperature is 400°C and the calcination time is 2h, the nano-ZnO has been completely crystallized, the ZnO particle size is uniform and is about 20 nm, the photocatalytic activity is the best and can reach up to 95%.

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