ZnO based nanomaterials for photocatalytic degradation of aqueous pharmaceutical waste solutions – A contemporary review

Majumder, Soma; Chatterjee, Somenath; Basnet, Parita; Mukherjee, Jaya

doi:10.1016/j.enmm.2020.100386

Cited by 50 publications

(22 citation statements)

References 118 publications

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“…The high efficiency of Czm removal under UV irradiation makes this method one of the most promising, but increasing the diversity and efficacy of photoactive catalysts applicable to this reaction is a current relevant challenge. ZnO-based nanomaterials are among the most widely used in photocatalysis due to their high thermal conductivity, high exciton binding energy (60 MeV), high electron mobility and wide bandgap (3.2–3.4 eV) of zinc oxide [ 25 , 26 ]. A number of previous studies have shown that doping ZnO nanostructures with nanoscale forms of copper and CuO can significantly increase the catalytic activity in a variety of organic dye removal reactions [ 27 , 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Cu2O/ZnO@PET Composite Membrane for the Photocatalytic Degradation of Carbendazim

et al. 2022

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The extremely high levels of water pollution caused by various industrial activities represent one of the most important environmental problems. Efficient techniques and advanced materials have been extensively developed for the removal of highly toxic organic pollutants, including pesticides. This study investigated the photocatalytic degradation of the fungicide carbendazim (Czm) using composite track-etched membranes (TeMs) in an aqueous solution. Copper(I) oxide (Cu2O) and zinc oxide (ZnO) microtubes (MTs) were prepared using an electroless template deposition technique in porous poly(ethylene terephthalate) (PET) TeMs with nanochannels with a density of 4 × 107 pores/cm−2 and diameter of 385 ± 9 nm to yield Cu2O@PET and ZnO@PET composite membranes, respectively. A mixed Cu2O/ZnO@PET composite was prepared via a two-step deposition process, containing ZnO (87%) and CuZ (13%) as crystalline phases. The structure and composition of all composite membranes were elucidated using scanning electron microscopy (SEM), atomic force microscopy (AFM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques. Under UV–visible light irradiation, the Cu2O/ZnO@PET composite displayed enhanced photocatalytic activity, reaching 98% Czm degradation, higher than Cu2O@PET and ZnO@PET composites. The maximum Czm degradation efficiency from aqueous solution was obtained at an optimal pH of 6 and contact time of 140 min. The effects of various parameters such as temperature, catalyst dosage and sample exposure time on the photocatalytic degradation process were studied. The degradation reaction of Czm was found to follow the Langmuir–Hinshelwood mechanism and a pseudo-first order kinetic model. The degradation kinetics of Czm accelerated with increasing temperature, and the activation energy (Ea) levels were calculated as 11.9 kJ/mol, 14.22 kJ/mol and 15.82 kJ/mol for Cu2O/ZnO@PET, ZnO@PET and Cu2O@PET composite membranes, respectively. The reusability of the Cu2O/ZnO@PET catalyst was also investigated at different temperatures for 10 consecutive runs, without any activation or regeneration processes. The Cu2O/ZnO@PET composite exhibited degradation efficiency levels of over 50% at 14 °C and over 30% at 52 °C after 5 consecutive uses.

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Section: Introductionmentioning

confidence: 99%

A Novel Cu2O/ZnO@PET Composite Membrane for the Photocatalytic Degradation of Carbendazim

et al. 2022

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“…The photocatalytic degradation for ZnO photocatalyst was investigated [ 42 , 43 , 44 ]. The CA-ZnO membrane evaluated the photocatalytic degradation of MB, a well-known organic dye performed with a stable solution at room temperature [ 45 , 46 ].…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Textile Dye on Blended Cellulose Acetate Membranes

et al. 2022

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This work aimed to investigate the degradation performance of natural cellulose acetate (CA) membranes filled with ZnO nanostructures. Photocatalytic degradation of reactive toxic dye methylene blue (MB) was studied as a model reaction using UV light. A CA membrane was previously casted and fabricated through the phase inversion processes and laboratory-synthesized ZnO microparticles as filler. The prepared membrane was characterized for pore size, ultrafiltration (UF) performance, porosity, morphology using scanning electron micrographs (SEM), water contact angle and catalytic degradation of MB. The prepared membrane shows a significant amount of photocatalytic oxidation under UV. The photocatalytic results under UV-light radiation in CA filled with ZnO nanoparticles (CA/ZnO) demonstrated faster and more efficient MB degradation, resulting in more than 30% of initial concentration. The results also revealed how the CA/ZnO combination effectively improves the membrane’s photocatalytic activity toward methylene blue (MB), showing that the degradation process of dye solutions to UV light is chemically and physically stable and cost-effective. This photocatalytic activity toward MB of the cellulose acetate membranes has the potential to make these membranes serious competitors for removing textile dye and other pollutants from aqueous solutions. Hence, polymer–ZnO composite membranes were considered a valuable and attractive topic in membrane technology.

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Section: Giới Thiệu Chungunclassified

“…Với cấu trúc nano, pha tạp và composite, hiệu quả quang xúc tác của ZnO đã được tăng lên đáng kể [5,6]. Nguyên nhân là làm giảm được khả năng tái tổ hợp của các cặp electron-lỗ trống trong quá trình quang hoá, đồng thời đã mở rộng được bờ hấp thụ của vật liệu về vùng khả kiến [5][6][7]. Tuy nhiên, hầu hết các nghiên cứu hiện nay đang tập trung vào loại vật liệu nano dạng bột mà chưa có nhiều nghiên cứu về màng nano ZnO cho ứng dụng quang xúc tác [8][9][10][11].…”

Section: Giới Thiệu Chungunclassified

Study on fabrication of Sn-doped ZnO thin films oriented to the application for organic dye degradation catalysts in water environment

Viet¹,

Thu²,

Minh³

et al. 2021

Vietnam j. catal. adsorp.

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In this study, zinc oxide (ZnO) doped with Sn thin films were deposited on the glass substrate at 550 °C by dip-coating technique using the solution synthesized by sol-gel method. The structural, surface morphology, optical and photocatalytic property of thin films were studied. X-ray diffraction (XRD) analysis showed that the Sn-doping greatly changed the microstructure, morphology and optical properties of ZnO films, which may contribute to the enhancement of photocatalytic activity. Additionally, the photocatalytic activity was investigated using methylene blue dye under solar irradiation, with has high UV index from 7 to 8. The results indicated that Sn-doped ZnO had a higher photocatalytic activity and Sn dopant greatly increased the photocatalytic activity of ZnO thin film.

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ZnO based nanomaterials for photocatalytic degradation of aqueous pharmaceutical waste solutions – A contemporary review

Cited by 50 publications

References 118 publications

A Novel Cu2O/ZnO@PET Composite Membrane for the Photocatalytic Degradation of Carbendazim

A Novel Cu2O/ZnO@PET Composite Membrane for the Photocatalytic Degradation of Carbendazim

Photocatalytic Degradation of Textile Dye on Blended Cellulose Acetate Membranes

Study on fabrication of Sn-doped ZnO thin films oriented to the application for organic dye degradation catalysts in water environment

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