Synthesis of ZnWO4−x nanorods with oxygen vacancy for efficient photocatalytic degradation of tetracycline

Synthesis of MoS2/CdS Heterostructures on Carbon‐Fiber Cloth as Filter‐Membrane‐Shaped Photocatalyst for Purifying the Flowing Wastewater under Visible‐Light Illumination

“…These produced e À and ·OH exhibit strong reduction and oxidation capability respectively, promoting degradation of many kinds of pollutants [Eq. (7)].…”

“…The sticking point is to prepare effective, visible‐light‐drivable and recyclable semiconductor nanomaterials. To date, various semiconductors have been reported, such as sulfides (CdS, Bi 2 S 3 , simple oxide (TiO 2 , Ag 2 O, complex oxides (Bi 2 WO 6 , ZnWO 4–X , Ag 3 PO 4 ) and nitrides (C 3 N 4 , GaN), etc. Among them, sulfide semiconductors (such as CdS, MoS 2 , Ag 2 S, etc) have drawn much attention due to their narrow bandgaps which are responsive to visible light .…”

Recent advances in photodegradation of antibiotic residues in water

“… Strategies Catalysts and concentration Light source Antibiotic and concentration Degradation efficiency Ref. Vacancies BiOCl with abundant oxygen vacancies 0.5 g/L 300-W Xe lamp (λ > 420 nm) Tetracycline hydrochloride 10 mg/L Approximately 87% optimum within 2 h [51] Vacancies Oxygen vacancy-rich mesoporous ZrO 2 1 g/L 300-W Xe lamp (λ > 420 nm) Tetracycline hydrochloride 40 mg/L Approximately 80% optimum within 150 h [52] Vacancies BiOBr microspheres with oxygen vacancies 1 g/L 10-W LED lamp (0.4 mW‧cm −2 ) Tetracycline (TC) 20 mg/L Approximately 94% optimum within 90 min [53] Vacancies ZnWO 4-x nanorods with oxygen vacancy 0.2 g/L Hg lamp 300-W UV or 300-W Xe lamp (UV–Vis-NIR) Tetracycline 20 mg/L Approximately 91% optimum within 90 min [54] Vacancies Bi 2 MoO 6 with oxygen vacancy 0.4 g/L 300-W Xe lamp (λ > 400 nm) Ciprofloxacin 20 mg/L Approximately 55% optimum within 120 min [55] Doping Carbon-doped g-C 3 N 4 0.5 g/L Sunlight Tetracycline 20 mg/L Approximately 90% optimum within 90 min [56] Doping P-O co-doped g-C 3 N 4 1 g/L 350-W Xe lamp (λ>420 nm) Enrofloxacin10 mg/L Approximately 90% within 80 min [57] Doping I and K co-doped g-C 3 N 4 2 g/L 300-W Xe lamp (λ>420 nm) Sulfamethoxazole 10 mg/L Approximately 99% optimum within 45 min [58] …”

“…The absorption edge of the obtained sample was extended into the visible range, and the modified surface characteristics promoted adsorption ability towards organic compounds, leading to an enhancement of the visible-light-driven photodegradation of organic contaminants. Similarly, brown ZnWO 4-x nanorods containing oxygen vacancies exhibited a broadened photo-absorption capacity from the ultraviolet (UV) to the near-infrared (NIR) region, whereas conventional white ZnWO 4 nanorods without OV exhibited a UV absorption onset at 365 nm [54] .…”

Construction of n-TiO2/p-Ag2O Junction on Carbon Fiber Cloth with Vis–NIR Photoresponse as a Filter-Membrane-Shaped Photocatalyst

“…TiO 2 is a representative and widely used semiconductor nanomaterial for water purification [6,7]. However, TiO 2 , with a wide band-gap of 3.2 eV, is only excited under ultraviolet (UV) light which occupies only 5% of the total solar spectrum [8][9][10]. Naturally, modifying TiO 2 , which can absorb lower-energy spectra, is the research hotspot to develop the novel photocatalysts, particularly on the extension of the spectral response to the visible-light region [11][12][13].…”