Preparation of Flower-Like ZnO Nanoparticles by High-Gravity Assisted Ammonia Decomposition Method and Their Photoluminescence Properties

Zinc oxide (ZnO) nanoparticles with tunable particle size and photoluminescence (PL) properties were successfully prepared by a facile ammonia decomposition method in a rotating packed bed (RPB) reactor. The zinc-ammonia complex, generated from chemical process of zinc mineral, reacted with steam to precipitate the precursor of ZnO. It was found that both the particle size of ZnO and the precipitation rates of Zn strongly depended on the steam flow rate, high-gravity level, calcination temperature. The flower-like ZnO with primary particle size of ~45 nm had improved PL performance, which further confirmed the intensification of RPB reactor. Moreover, the results showed that the precipitation rate of Zn could reach up to 98% under the optimized conditions. It was believed that RPB reactors with well mass transfer and mixing performances, short preparation time and low energy consumption would be a promising device for the continuous preparation of nano-ZnO materials.

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High-gravity deoxygenation of jet fuels using rotating packed bed

Fuel ◽

10.1016/j.fuel.2021.123080 ◽

2022 ◽

Vol 314 ◽

pp. 123080

Author(s):

Shiyu Yuan ◽

Zhiqiang Liu ◽

Guozhu Liu

Keyword(s):

Packed Bed ◽

Jet Fuels ◽

High Gravity ◽

Rotating Packed Bed

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Pt-catalyzed ozonation of aqueous phenol solution using high-gravity rotating packed bed

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2009.02.171 ◽

2009 ◽

Vol 168 (2-3) ◽

pp. 649-655 ◽

Cited By ~ 31

Author(s):

Chia-Chi Chang ◽

Chun-Yu Chiu ◽

Ching-Yuan Chang ◽

Chiung-Fen Chang ◽

Yi-Hung Chen ◽

...

Keyword(s):

Packed Bed ◽

High Gravity ◽

Phenol Solution ◽

Rotating Packed Bed ◽

Pt Catalyzed

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Preparation of TiO2 and Fe-TiO2 with an Impinging Stream-Rotating Packed Bed by the Precipitation Method for the Photodegradation of Gaseous Toluene

Nanomaterials ◽

10.3390/nano9081173 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1173 ◽

Cited By ~ 2

Author(s):

Guangping Zeng ◽

Qiaoling Zhang ◽

Youzhi Liu ◽

Shaochuang Zhang ◽

Jing Guo

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

Packed Bed ◽

Pure Tio2 ◽

Precipitation Method ◽

Nano Tio2 ◽

X Ray ◽

Rotating Packed Bed ◽

Bet Analysis ◽

Gaseous Toluene

Nano-TiO2 has always been one of the most important topics in the research of photocatalysts due to its special activity and stability. However, it has always been difficult to obtain nano-TiO2 with high dispersion, a small particle size and high photocatalytic activity. In this paper, nano-TiO2 powder was prepared by combining the high-gravity technique and direct precipitation method in an impinging stream-rotating packed bed (IS-RPB) reactor followed by Fe3+ in-situ doping. TiOSO4 and NH3·H2O solutions were cut into very small liquid microelements by high-speed rotating packing, and the mass transfer and microscopic mixing of the nucleation and growth processes of nano-TiO2 were strengthened in IS-RPB, which was beneficial to the continuous production of high quality nano-TiO2. Pure TiO2 and iron-doped nano-TiO2 (Fe-TiO2) were obtained in IS-RPB and were investigated by means of X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer–Emmett–Teller (BET) analysis, which found that pure TiO2 had a particle size of about 12.5 nm, good dispersibility and a complete anatase crystal at the rotating speed of packing of 800 rpm and calcination temperature of 500 °C. The addition of Fe3+ did not change the crystalline structure of TiO2. Iron was highly dispersed in TiO2 without the detection of aggregates and was found to exist in a positive trivalent form by XPS. With the increase of iron doping, the photoresponse range of TiO2 to visible light was broadened from 3.06 eV to 2.26 eV. The degradation efficiency of gaseous toluene by Fe-TiO2 under ultraviolet light was higher than that of pure TiO2 and commercial P25 due to Fe3+ effectively suppressing the recombination of TiO2 electrons and holes; the highest efficiency produced by 1.0% Fe-TiO2 was 95.7%.

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Synthesis of flower-shaped V2O5:Fe3+ microarchitectures in a high-gravity rotating packed bed with enhanced electrochemical performance for lithium ion batteries

Chemical Engineering and Processing - Process Intensification ◽

10.1016/j.cep.2017.07.019 ◽

2017 ◽

Vol 120 ◽

pp. 201-206 ◽

Cited By ~ 11

Author(s):

Xiaochen Yang ◽

Jingning Leng ◽

Dan Wang ◽

Zhiyong Wang ◽

Jie-Xin Wang ◽

...

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Lithium Ion ◽

Packed Bed ◽

High Gravity ◽

Rotating Packed Bed ◽

Enhanced Electrochemical Performance

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High-Gravity-Assisted Green Synthesis of NiO-NPs Anchored on the Surface of Biodegradable Nanobeads with Potential Biomedical Applications

Journal of Biomedical Nanotechnology ◽

10.1166/jbn.2020.2904 ◽

2020 ◽

Vol 16 (4) ◽

pp. 520-530 ◽

Cited By ~ 2

Author(s):

Navid Rabiee ◽

Mojtaba Bagherzadeh ◽

Amir Mohammad Ghadiri ◽

Mahsa Kiani ◽

Sepideh Ahmadi ◽

...

Keyword(s):

Antioxidant Activities ◽

Biological Activities ◽

Synthesis Method ◽

Packed Bed ◽

High Gravity ◽

Leaf Extracts ◽

Nickel Oxide Nanoparticles ◽

Synthesis Of Nanoparticles ◽

Rotating Packed Bed ◽

Nio Nps

Here, an unprecedented synthesis method for nickel oxide nanoparticles (NiO-NPs) was facilitated using Salvia hispanica leaf extracts with the assistance of a high gravity rotating packed bed (RPB) system that enabled fast mass transfer and molecular mixing. The synthesized nanoparticles were anchored on the surface of biodegradable chitosan nanobeads and their photocatalytic activity was evaluated by the degradation of methylene blue. Additionally, the potential biological activities of NiO-NPs in terms of antibacterial (Staphylococcus aureus and Escherichia coli for 24 hours), cytotoxicity (using the PC12 cell line for 24 and 72 hours), and antioxidant activities (based on the discoloration of the methanolic solution of DPPH) were assessed. This novel approach for NiO-NPs@Chitosan synthesis as mediated by a renewable plant extract and facilitated by a high-gravity method, led to the greener synthesis of nanoparticles with significant antibacterial and photocatalytic properties.

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