Design of mesoporous ZnO @ silica fume-derived SiO2 nanocomposite as photocatalyst for efficient crystal violet removal: Effective route to recycle industrial waste

Kassem, Kh.O.; Hussein, M.A.; Motawea, Mohamed M.; Gomaa, Hassanien; Alrowaili, Z.A.; Ezzeldien, Mohammed

doi:10.1016/j.jclepro.2021.129416

Cited by 43 publications

(17 citation statements)

References 55 publications

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“…Furthermore, silica-supported zinc oxide (SiO 2 /ZnO) has also been found to exhibit good recyclability up to five cycles of use in the degradation of RhB, which has been assigned to the improved dispersion of ZnO on the silica surface, better adsorption of RhB on SiO 2 /ZnO and the reduction in the defect states of ZnO structure, thus preserving the photoactivity after/for repeated use [74]. Similarly, the mesoporous ZnO@SiO 2 nanocomposite exhibited excellent photoactivity for CV removal up to five cycles, with only a slight decrease of < 10% in the activity noted [110].…”

Section: Handling Separation and Recyclabilitymentioning

confidence: 93%

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Ullah

Ferreira-Neto

Khan

et al. 2022

Photochem Photobiol Sci

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Heterogeneous photocatalysis employing semiconductor oxide photocatalysts is a sustainable and promising method for environmental remediation and clean energy generation. In this context, nanostructured photocatalysts, with at least one dimension in the 1-100 nm size regime, have attracted ever-growing attention due to their unique and often enhanced sizedependent physicochemical properties. While their reduced size ensures enhanced photocatalytic performance, the same makes it difficult and time/energy-demanding to remove/recover such nanostructured photocatalysts from aqueous media. This fundamental limitation has paved the way towards developing supported nanophotocatalysts where the active photocatalytic nanostructures are coated on the surface of polymeric or inorganic support materials, often in a core@shell conformation. This arrangement solves the problem of photocatalysts' recovery for effective reuse or recycling and leads to improved and desired target properties due to specific photocatalyst-support interactions. While the enhanced physicochemical properties of supported photocatalysts have been widely studied in many target applications, the role of support-photocatalysts interactions in improving these properties remains unexplored. This review article provides an updated viewpoint on the photocatalyst-support interactions and the resulting unique physiochemical properties important for diverse photochemical applications and the design of practical devices. While exploring the properties of supported nanostructured metal oxide/ sulfides photocatalysts such as TiO 2 and MoS 2 , we also briefly discuss the common strategies employed to coat the active nanomaterials on the surface of different supports (organic/polymeric, inorganic, active, inert, and magnetic).

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Section: Handling Separation and Recyclabilitymentioning

confidence: 93%

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Ullah

Ferreira-Neto

Khan

et al. 2022

Photochem Photobiol Sci

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“…Zinc oxide (ZnO) is a versatile semiconductor photocatalysts with high ultraviolet (UV) shielding and refractive index, high electron mobility, and strong luminescence at room temperature [ 11 ], and ZnO-based photocatalysis has been widely explored for removing wastewater pollutants, including organic dyes [ 12 , 13 , 14 ]. However, as a typical broad-bandgap semiconductor, ZnO can be mainly excited by UV light, resulting in a low utilization rate of the visible light fraction of solar radiation, which, together with its vulnerability to corrosion under both irradiated and dark conditions [ 15 , 16 ], hinders the large-scale application of pure ZnO-based materials in the field of environmental photocatalysis [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Guan

Wang

et al. 2023

Toxics

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The extensive use of organic dyes in industry has caused serious environmental problems, and photocatalysis is a potential solution to water pollution by organic dyes. The practical application of powdery photocatalysts is usually limited by the rapid recombination of charge carriers and difficulty in recycling. In this study, recyclable carbon cloth-supported ZnO@Ag3PO4 composite with a core–shell structure was successfully prepared by solvothermal treatment and subsequent impregnation–deposition. The as-prepared carbon cloth-supported ZnO@Ag3PO4 composite showed an improved photocatalytic activity and stability for the degradation of rhodamine B (RhB), a model organic dye, under visible light irradiation. The decomposition ratio of RhB reached 87.1% after exposure to visible light for 100 min, corresponding to a reaction rate constant that was 4.8 and 15.9 times that of carbon cloth-supported Ag3PO4 or ZnO alone. The enhanced performance of the composite can be attributed to the effectively inhibited recombination of photoinduced electron–hole pairs by the S-scheme heterojunction. The carbon fibers further promoted the transfer of charges. Moreover, the carbon cloth-supported ZnO@Ag3PO4 can be easily separated from the solution and repeatedly used, demonstrating a fair recyclability and potential in practical applications.

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“…These methods include evaporation, chemical precipitation, nanofiltration, solvent extraction, flotation, ion exchange, and adsorption. Many of these methods, however, are inefficient, costly, unhealthy, and generate hazardous waste. − Adsorption is considered one of the most commonly used procedures for removing radioactive elements from water samples due to its superior selectivity, simplicity, affordability, and widespread applicability. − Therefore, developing adsorbents that can efficiently remove Th(IV) ions is a crucial and imperious issue . It has recently been reported that metal oxides such as γ-Al 2 O 3 are widely used in adsorption processes due to their abundant raw materials, large surface area, high porosity, great stability, low price, and excellent price adsorption performance .…”

Section: Introductionmentioning

confidence: 99%

“…11−14 Therefore, developing adsorbents that can efficiently remove Th(IV) ions is a crucial and imperious issue. 15 It has recently been reported that metal oxides such as γ-Al 2 O 3 are widely used in adsorption processes due to their abundant raw materials, large surface area, high porosity, great stability, low price, and excellent price adsorption performance. 16 Although γ-Al 2 O 3 has a high adsorption capacity at high concentrations of Th(IV) ions, complete removal of Th(IV) ions at low concentrations remains a formidable challenge.…”

Section: ■ Introductionmentioning

confidence: 99%

Detection and Selective Removal Strategy of Thorium Ions Using a Novel Fluorescent Ligand and Hybrid Mesoporous γ-Al₂O₃-like Nanoneedles

Gomaa

Emran

Elsenety

et al. 2023

ACS Sustainable Chem. Eng.

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Long-term exposure to radioactive elements through water, such as thorium ions, has undesirable impacts and may cause serious health problems like cancer. Therefore, this manuscript originally targets detection and elimination of thorium ions from water samples, even at trace concentrations. Herein, a novel ligand, (Z)-N-carbamimidoyl-4-((3-phenylnaphtho[1,2-b]furan-5-yl)diazenyl)benzenesulfonamide (CFBS), was synthesized for fluorometric detection of thorium ions. Then, the prepared CFBS-ligand was well-immobilized and grafted with mesoporous γ-Al2O3-like nanoneedles to prepare a hybrid mesoporous γ-Al2O3-like nanoneedles (CFBS@AlNNs) adsorbent. The CFBS@AlNNs adsorbent was employed to adsorb and remove thorium ions from an aqueous solution. The results indicated that trace concentrations of thorium ions could be detected and removed with good sensitivity and selectivity. The findings confirmed superior adsorption efficiency (98%) and capacity (142 mg/g) of used CFBS@AINNs toward Th(IV) ions at pH 4. The mechanism of Th(IV)-adsorption was explained mathematically through kinetic studies, isotherm models, and computational studies. One of the key advantages of CFBS@AlNNs is its thorium selectivity even in the presence of other coexisting ions. The CFBS@AlNN design showed significant thorium-removal/adsorption capacity, although multiple reuse/recycling followed a simple desorption process. Given its high selectivity, fast diffusion, and highly efficient adsorption, the CFBS@AlNNs sorbent can be considered a potential adsorbent to remove and recover thorium ions from various water samples and can be used to prevent the health risks related to the long-term and direct exposition of thorium ions.

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Design of mesoporous ZnO @ silica fume-derived SiO2 nanocomposite as photocatalyst for efficient crystal violet removal: Effective route to recycle industrial waste

Cited by 43 publications

References 55 publications

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Detection and Selective Removal Strategy of Thorium Ions Using a Novel Fluorescent Ligand and Hybrid Mesoporous γ-Al₂O₃-like Nanoneedles

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Design of mesoporous ZnO @ silica fume-derived SiO2 nanocomposite as photocatalyst for efficient crystal violet removal: Effective route to recycle industrial waste

Cited by 43 publications

References 55 publications

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Detection and Selective Removal Strategy of Thorium Ions Using a Novel Fluorescent Ligand and Hybrid Mesoporous γ-Al2O3-like Nanoneedles

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Detection and Selective Removal Strategy of Thorium Ions Using a Novel Fluorescent Ligand and Hybrid Mesoporous γ-Al₂O₃-like Nanoneedles