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Chemical Engineering Journal
Effects of Pt and Ag on the photocatalytic degradation of 4-chlorophenol and its by-products
2004 •
Pramoch Rangsunvigit
Ag 3 PO 4 Enhanced TiO 2 for Visible Light Photocatalysis of 2-Chlorophenol in Wastewater
Linh Phuong
— Facile in-situ synthesis and characterization of stable Ag 3 PO 4 /TiO 2 nanoparticles and their effectiveness for visible light photocatalysis has been reported. The surface morphology, crystal structure and chemical properties of the photocatalyst were characterized by using UV-vis-NIR spectroscopy, FSEM, XRD, XPS, TEM and nitrogen physisorption. The synthesized nanoparticles were polycrystalline with calculated energy band gap in the range of 2.3-2.5 eV. Deposition of Ag 3 PO 4 over the surface of TiO 2 resulted in stability increase and a significant shift in the UV absorption spectrum towards visible region. The photocatalytic experiments were performed under 112 W visible light irradiation (λ > 400 nm). The catalyst showed complete degradation of 15 mg/L 2-CP within 120 minutes while 92.5 % degradation of 25 mg/L 2-CP was achieved under optimized conditions. The study confirmed that Ag 3 PO 4 /TiO 2 has high potential for degradation of 2-CP from wastewater under visible-light irradiation.
Applied Catalysis B: Environmental
Photocatalytic degradation of concentrated solutions of 2,4-dichlorophenol using low energy light
2001 •
John Kiwi
Journal of Molecular Catalysis A: Chemical
Enhanced photocatalytic activity of TiO2 by doping with Ag for degradation of 2,4,6-trichlorophenol in aqueous suspension
2006 •
Rengaraj Selvaraj
Nanomaterials and Nanotechnology
Preparation of silver/silver bromide/titanium dioxide/graphene oxide nanocomposite for photocatalytic degradation of 4-chlorophenol
2017 •
Samuel Nascimento
A ultaviolet–visible light responded photocatalytic nanocomposite, silver/silver bromide/titanium dioxide, supported on graphene oxide (GO; silver/silver bromide/titanium dioxide/GO) was fabricated via a layer intercalation method using n-butylamine, cetyltrimethyl ammonium bromide, titanium dioxide and silver/silver bromide-intercalated GO successively. The resultant silver/silver bromide/titanium dioxide/GO exhibited much stronger visible light absorption and enhanced photocatalytic efficiency than titanium dioxide/GO and titanium dioxide. Furthermore, the degradation efficiency of silver/silver bromide/titanium dioxide/GO was improved when irradiated under light without the ultaviolet cut filter. The apparent degradation rate constants, k, for silver/silver bromide/titanium dioxide/GO, titanium dioxide/GO and titanium dioxide are 0.5192, 0.2273 and 0.0627 h−1. A possible photocatalytic degradation mechanism for degradation of 4-chlorophenol by silver/silver bromide/titanium dioxi...
Indonesian Journal of Chemistry
Effect of Solution pH on the Photo-Oxidation of 4-Chlorophenol by Synthesized Silver-Zinc Oxide Photocatalyst
hayati mukhair, Nur Syafiqa Hazirah Razali
Due to its toxicity, 4-chlorophenol (4CP) must be removed from the wastewater before discharging into open water. In this work, ZnO and Ag-ZnO photocatalysts were prepared via a solvothermal method under mild conditions (150 °C), followed by calcination at 300 °C and then characterized. The addition of Ag resulted in a change of the ZnO morphologies, which exhibited wurtzite structure, from irregular to rod-like shape, lower bandgap energy, and a lower electron-hole recombination rate. The 0.6 Ag-ZnO catalyst showed the highest efficiency in the photooxidation of 4CP under UV irradiation. Molecular 4CP exists in acidic and near-neutral conditions (pH 4 and 6) and is stable towards UV irradiation. Photooxidation of 2.3 × 10–4 mol/L 4CP by 0.8 g of 0.6% Ag-ZnO resulted in 67% removal of molecular 4CP at pH 6 with a rate constant of 4.0 × 10–3 min–1. Under similar conditions, a complete photooxidation of the anionic 4CP was observed at pH 11 with a rate constant of 1.4 × 10–2 min–1. Th...
photocatalytic degradation of chlorophenol in water
Radwa Elsalamony
This work aims to study the photocatalytic degradation of chlorophenols. They belong to a notable group of pollutants because of their high toxicity, and hardly biodegradable, and are difficult to remove from the environment. Photocatalytic degradation of chlorophenols using UV light was investigated over mesoporous catalysts. Ti-MCM-41(20), Ti-MCM-41(10), TiO2/MCM-41, Fe-Ti-MCM-41, TiO2/Fe-MCM-41 and TiO2/SBA-15 catalysts were prepared from the corresponding metal salts by the sol-gel technique. The catalyst were investigated using X-ray diffraction (XRD), FT-IR spectroscopes, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and BET surface areas of the samples were determined using the nitrogen adsorption and desorption isotherms. 100 ppm was used as model pollutants. High purity 2,4,6-trichlorophenol and 4-chlorophenol solutions individually and 0.1 g/L of each catalyst was tested at different irradiation times. At each interval time 10 ml of irradiated solution was taken and analyzed by High Performance Liquid Chromatography (HPLC), Ion Chromatography (IC). Aromatic intermediates, organic acid and chloride ions were detected. The reaction mechanism has been proposed.
Current Chemistry Letters
The removal of 2,4-dichlorophenol under visible light irradiation by silver indium sulfide nanoparticles synthesized by microwave
2013 •
Azadeh Tadjarodi
Korean Journal of Chemical Engineering
Photocatalytic degradation of 2,4-dichlorophenol over Fe-ZnO catalyst under visible light
2015 •
Pradabduang Kiattisaksiri
Silver Doped TiO 2 Nanoparticles: Preparation, Characterization and Efficient Degradation of 2,4-dichlorophenol Under Visible Light
J. Water Environ. Nanotechnology - JWENT
Hydrothermally synthesized TiO 2 nanoparticles containing different amounts of silver were characterized by X-Ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM/EDX) techniques. XRD results showed prepared samples include 100% anatase phase. The presence of silver in TiO 2 nanoparticle network was established by XRD, SEM/EDX and FT-IR techniques. The photocatalytic performance of the prepared catalysts was tested for the degradation of 2,4-dichlorophenol (2,4-DCP) under visible light.. The experiments demonstrated that 2,4-DCP was effectively degraded in the presence of Ag/TiO 2 samples. It was confirmed that the presence of Ag on TiO 2 catalysts could enhance the photocatalytic degradation of 2,4-DCP in aqueous suspension. It was found that an optimal dosage of 1.68 wt% Ag in TiO 2 achieved the fastest 2,4-DCP degradation (95% after 180 min irradiation) under the experimental conditions. On the basis of various characterizations of the photocatalysts, the reactions involved to explain the photocatalytic activity enhancement due to Ag doping include a better separation of photogenerated charge carriers. GC-MS analysis showed the major intermediates of 2,4-DCP degradation are simple acids like oxalic acid, acetic acid, etc. as the final products. How to cite this article
