Smart ZnO decorated optimized engineering materials for water purification under natural sunlight

Pivert, Marie Le; Zerelli, Brahim; Martin, Nathan; Capochichi-Gnambodoe, Martine; Leprince‐Wang, Yamin

doi:10.1016/j.conbuildmat.2020.119592

Cited by 19 publications

(20 citation statements)

References 35 publications

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“…Tiling samples showed NSs similar to ZnO NWs grown onto silicon in terms of morphology (~55 ± 17 nm), gap value (~3.20 ± 0.03 eV), and XRD pattern [28,29]. Conversely, a huge discrepancy was recorded on the morphologies of the ZnO NSs synthesized on concrete substrates.…”

Section: Engineering Materials Functionalizationmentioning

confidence: 91%

“…In short, a ZnO seed layer was deposited on engineering materials, such as tiling, concrete, and rocks aggregate, by a "horizontal impregnation" method with the zinc acetate ethanolic solution, followed by an annealing at 350 • C for 30 min. Then, a classical hydrothermal growth using equimolar aqueous solutions of HMTA and Zn(NO 3 ) 2 or Zn(Ac) 2 at 0.025 M was carried out in an autoclave at 90 • C. According to our previous work about the optimal growth conditions depending on the used substrate [29], 2 h was selected as an optimal growth duration for tiling or rock aggregate substrates, and 1 h 30 min for concrete substrates. Finally, the as-synthesized samples were annealed for 30 min at 350 • C to remove all the potential residues from the synthesis process and to improve the ZnO NSs crystallinity.…”

Section: Engineering Materials Functionalizationmentioning

confidence: 99%

“…Conversely, a huge discrepancy was recorded on the morphologies of the ZnO NSs synthesized on concrete substrates. Depending on the growth time (1 h 30 min to 4 h), NSs vary from complex ZnO nanosheet structures with a lower gap value (~3.11 ± 0.04 eV) to NWs and NRs with a gap value of (~3.17 ± 0.04 eV) [29]. This might be due to a possible influence of the basic surface pH value and the complex chemical composition of concrete.…”

Section: Engineering Materials Functionalizationmentioning

confidence: 99%

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Hydrothermally Grown ZnO Nanostructures for Water Purification via Photocatalysis

2022

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Semiconductor-based photocatalysis is a well-known and efficient process for achieving water depollution with very limited rejects in the environment. Zinc oxide (ZnO), as a wide-bandgap metallic oxide, is an excellent photocatalyst, able to mineralize a large scale of organic pollutants in water, under UV irradiation, that can be enlarged to visible range by doping nontoxic elements such as Ag and Fe. With high surface/volume ratio, the ZnO nanostructures have been shown to be prominent photocatalyst candidates with enhanced photocatalytic efficiency, owing to their being low-cost, non-toxic, and able to be produced with easy and controllable synthesis. Thus, ZnO nanostructures-based photocatalysis can be considered as an eco-friendly and sustainable process. This paper presents the photocatalytic activity of ZnO nanostructures (NSs) grown on different substrates. The photocatalysis has been carried out both under classic mode and microfluidic mode. All tests show the notable photocatalytic efficiency of ZnO NSs with remarkable results obtained from a ZnO-NSs-integrated microfluidic reactor, which exhibited an important enhancement of photocatalytic activity by drastically reducing the photodegradation time. UV-visible spectrometry and high-performance liquid chromatography, coupled with mass spectrometry (HPLC-MS), are simultaneously used to follow real-time information, revealing both the photodegradation efficiency and the degradation mechanism of the organic dye methylene blue.

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Section: Engineering Materials Functionalizationmentioning

confidence: 91%

Section: Engineering Materials Functionalizationmentioning

confidence: 99%

Section: Engineering Materials Functionalizationmentioning

confidence: 99%

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Hydrothermally Grown ZnO Nanostructures for Water Purification via Photocatalysis

2022

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“…However, ZnO is potentially applicable in various fields, and several studies are currently being conducted on the multifunctionality of ZnO in cement/concrete. The zinc oxide applied to cement is a material reported to be effective in antibacterial concrete [ 30 , 31 ], radiation shielding [ 32 ], water purification [ 33 ], anticorrosion of steel [ 34 ], and photocatalysis [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Development and Characteristics of Aerated Alkali-Activated Slag Cement Mixed with Zinc Powder

2021

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Experiments on the development and properties of aerated concrete based on alkali-activated slag cement (AASC) and using Zn powder (ZP) as a gas agent were carried out. The experiments were designed for water-binding material (w/b) ratios of 0.35 and 0.45, curing temperatures of 23 ± 2 °C and 40 ± 2 °C, and ZP of 0.25%, 0.50%, 0.75%, and 1.0%. ZP generates hydrogen (H2) gas in AASC to form pores. At a w/b of 0.35, the curing temperature had little effect on the pore size by ZP. However, a w/b of 0.45 showed a clear correlation that the pore diameter increased as the curing temperature increased. The low w/b of 0.35 showed a small change in the pore size according to the curing temperature due to the faster setting time than 0.45 and the increased viscosity of the paste. Therefore, at a termination time exceeding at least 60 min and a w/b of 0.45 or more, it was possible to increase the size and expansion force of the pores formed by the ZP through the change of the curing temperature. ZP showed applicability to the manufacture of AASC-based aerated concrete, and the characteristics of foaming according to the curing temperature, w/b ratio, and ZP concentration were confirmed.

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“…To avoid those additional steps, an alternative solution is to rely on a surface substrate supporting nanowire arrays with a high surface-to-volume ratio. This strategy has been frequently used and proven as an efficiency-enhanced photocatalyst [13]. Compared to TiO 2 , whose NWs are usually synthesized in free form and dispersed in a growth solution, substrate-supported ZnO NW arrays can be easily synthesized onto a surface by chemical bath deposition such as a hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

TiO2-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance

et al. 2021

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Photocatalysis is proven to be the most efficient and environmentally friendly method for the degradation of organic pollutants in water purification. To meet the requirement of large-scale water treatment, there are two important points: One is the lifetime and chemical stability of the photocatalyst material, especially in the complex and harsh aqueous conditions. The other is the ease of synthesis of such photocatalysts with specific nano-morphology. In this work, two common photocatalyst materials, zinc oxide (ZnO) and titanium dioxide (TiO2), are selected to form more sustainable photocatalysts with high chemical stability. This involves the combination of both TiO2 and ZnO in a two-step simple synthesis method. It appears advantageous to exploit the conformal deposition of atomic layer deposition (ALD) to achieve nanometer-thick TiO2 coating on ZnO nanowires (NWs) with a high aspect ratio, which are firmly anchored to a substrate and exhibit a large specific surface area. The high chemical stability of the ALD TiO2 coating has been investigated in detail and proven to be effective under both strong acid and strong alkaline aqueous solutions. In addition, photocatalysis experiments with organic dyes show that via this simple two-step synthesis method, the produced ZnO/TiO2 tandem photocatalysts does indeed exhibit improved chemical stability in a harsh environment, while allowing efficient photodegradation.

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Smart ZnO decorated optimized engineering materials for water purification under natural sunlight

Cited by 19 publications

References 35 publications

Hydrothermally Grown ZnO Nanostructures for Water Purification via Photocatalysis

Hydrothermally Grown ZnO Nanostructures for Water Purification via Photocatalysis

Development and Characteristics of Aerated Alkali-Activated Slag Cement Mixed with Zinc Powder

TiO2-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance

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