Cool and photocatalytic reddish-brown nanostructured Fe2O3@SiO2@TiO2 pigments

Sadeghi-Niaraki, Somayeh; Ghasemi, Behrooz; Habibolahzadeh, Ali; Ghasemi, Ebrahim; Ghahari, Mehdi

doi:10.1016/j.mseb.2020.114752

Cited by 18 publications

(5 citation statements)

References 42 publications

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“…The peak observed at 1623 cm −1 is associated with water molecules in the inner layers of the nanoparticle structure, while the broad peak at 3284.6 cm −1 is indicative of stretching vibrations of O–H in silanol groups and water molecules. The absorption peak at 1099.5 cm −1 corresponds to the stretching vibration of Si–O–Si bonds, and peaks around 756.1 cm −1 indicate stretching and bending vibrations of Ti–O–Si, indicating the presence of titanium dioxide and silica coatings on the surface of CIST nanocomposite 33 , 34 .…”

Section: Resultsmentioning

confidence: 99%

Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

Buenaño,

Ali,

Jafer

et al. 2024

Sci Rep

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In this study, a CoO–Fe2O3/SiO2/TiO2 (CIST) nanocomposite was synthesized and utilized as an adsorbent to remove methylene blue (MB), malachite green (MG), and copper (Cu) from aqueous environments. The synthesized nanocomposite was characterized using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Input parameters included pH (3–10), contact time (10–30 min), adsorbent amount (0.01–0.03 g), and pollutant concentration (20–60 mg L−1). The effects of these parameters on the removal process efficiency were modeled and optimized using the response surface methodology (RSM) based on the Box–Behnken design (BBD). The RSM-BBD method demonstrated the capability to develop a second-degree polynomial model with high validity (R2 ˃ 0.99) for the removal process. The optimization results using the RSM-BBD method revealed a removal efficiency of 98.01%, 93.06%, and 88.26% for MB, MG, and Cu, respectively, under optimal conditions. These conditions were a pH of 6, contact time of 10 min, adsorbent amount of 0.025 g, and concentration of 20 mg L−1. The synthesized adsorbent was recovered through five consecutive adsorption–desorption cycles using hydrochloric acid. The results showed an approximately 12% reduction from the first to the seventh cycle. Also, MB, MG, and Cu removal from real water samples in optimal conditions was achieved in the range of 81.69–98.18%. This study demonstrates the potential use of CIST nanocomposite as an accessible and reusable option for removing MB, MG, and Cu pollutants from aquatic environments.

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Section: Resultsmentioning

confidence: 99%

Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

Buenaño,

Ali,

Jafer

et al. 2024

Sci Rep

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“…This clearly shows that there is still the need to enhance the NIR reflectance of colour pigments while at the same time improving their colour intensity [196,197]. [195] NiTiO3@TiO2 Bright Yellow Nanometres ~70% [196] TiO2@CoTiO3 Green Nanometres ~60% [160] TiO2@NiTiO3 Yellow Nanometres ~70% [198] (Fe, Cr)2O3@TiO2 Brown Nanometres 57.8% [199] Fe2O3@SiO2@TiO2 Reddish Brown Nanometres ~ 68% [200] Fe2O3@SiO2 Brown Nanometres ~ 45% [201] (HGMs)@ZnSxSe1−x Light Yellow Micrometres ~85% [202] (HGMs)@ZnSxSe1−x: Cu/In Bright Red Micrometres ~75% [202] (HGMs)@ZnO White Nanometres ~95.7%. [203] (HGM)@BiOCl1-xIx Yellow to Light Orange Micrometres 92.6-94.7% [204] Mica-titania White Nanometres ~97.4% [205] BiFe1−xAlxO3@mica-titania Brown to Orange Nanometres 63.5-73.6% [206] Yao et al [195] prepared composite inorganic pigments with TiO2@CuO core-shell structure (Figure 31 (a)) by a co-precipitation method, which had a dark colour and high NIR reflectivity.…”

Section: Core-shell Structuresmentioning

confidence: 99%

Nanomaterials with high solar reflectance as an emerging path towards energy-efficient envelope systems: a review

et al. 2021

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The application of nanomaterials in the construction field is allowing the development of smart, green, durable and more efficient buildings. Among the most widely researched nanomaterials are nano-sized cool pigments, which are being enforced to achieve thermal and energy efficient façades, with the development of high reflectance and retroreflectance coatings. Their peculiar optical and catalytic activity turns nanomaterials into suitable candidates to be use as dark coloured high solar reflectance without affecting aesthetic characteristics, thus improving the durability of coatings. The objective of this paper is to review the state-of-the-art on the benefits of using high reflectance nano pigments as coatings in building façades and their production and synthesis processes. It is thus divided into three main topics: (i) the benefits of using nanopigments on façades, (ii) the most important nanomaterials used as cool pigments and (iii) the main methods of synthesising nanopigments. One expects that the study of near-infrared nanopigmentation synthesis processes will be able to promote and disseminate the use of nanotechnology in construction, assessing the production problems and limitation and thus helping to disseminate new products by reducing production costs and increase availability.

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“…In a similar follow‐up work by the same group, they changed the shell to a SiO 2 /TiO 2 bilayer to investigate the reflective and photocatalytic properties of reddish‐brown Fe 2 O 3 @SiO 2 @TiO 2 . [ 59 ] The same procedure was used to synthesize the Fe 2 O 3 nanoparticles and the TiO 2 outer shell, except for an added step of calcining the Fe 2 O 3 nanoparticles in air at 600°C after drying. In addition, a layer of SiO 2 was grown on the Fe 2 O 3 nanoparticles by the Stöber sol‐gel process using TEOS and ammonia as the precursors before the outer layer of TiO 2 was grown.…”

Section: Reflective Core‐shell Micro‐/nano‐structuresmentioning

confidence: 99%

Core‐Shell Micro‐ and Nano‐Structures for The Modification of Light‐Surface Interactions

Yeo,

Yu Tan

et al. 2023

Advanced Optical Materials

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Controlling how a material interacts with light is key to optimizing its optical properties to fit a desired function or application. The most straightforward approach is to chemically or physically modify the surface exposed to incident light. An effective method of surface modification is based on the addition of core‐shell structures at the surface. Of particular importance to many technological applications are core‐shell structures with dimensions comparable to the wavelengths of light extending from the UV up to the near‐IR region of the electromagnetic spectrum, which coincides with the major part of the solar spectrum. Surface modification approaches to tailor the optical properties of materials in this range of wavelengths are increasingly relevant in the context of materials and devices used in sustainable energy applications, such as solar cells and heat‐reflective paints. These materials are useful to mitigate the current energy and climate crises by allowing for enhanced energy harvesting and improved thermal management, respectively. Here, recent progress in the fabrication and application of core‐shell micro‐/nano‐structures for the modification of light interaction with surfaces is highlighted. Some limitations and future directions for the design of core‐shell materials are also discussed.

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Cool and photocatalytic reddish-brown nanostructured Fe2O3@SiO2@TiO2 pigments

Cited by 18 publications

References 42 publications

Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

Nanomaterials with high solar reflectance as an emerging path towards energy-efficient envelope systems: a review

Core‐Shell Micro‐ and Nano‐Structures for The Modification of Light‐Surface Interactions

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