Phenol photocatalytic degradation over mesoporous TUD-1-supported chromium oxide-doped titania photocatalyst

Ooi, Yee Khai; Yuliati, Leny; Lee, Siew Ling

doi:10.1016/s1872-2067(16)62492-0

Cited by 19 publications

(9 citation statements)

References 35 publications

(54 reference statements)

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“…Apart from that, the high electron-hole pairs recombination rate of TiO 2 has reduced its quantum e ciency (Leong et al, 2021) . As a result, modication of TiO 2 has been conducted using di erent metals or metal oxides to broaden its absorption spectra to visible light region (Koh et al, 2017;Koh et al, 2020;Ooi et al, 2020;Ooi et al, 2016). Properties of TiO 2 could be improved by doping of Cu compounds due to their high conductivity and low toxicity (Isa et al, 2020;Sabran et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of Synthesis Methods on Properties of Copper Oxide Doped Titanium Dioxide Photocatalyst in Dye Photodegradation of Rhodamine B

Leong

Teh

Chen

et al. 2022

Sci.Technol.Indonesia

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Copper modified titanium dioxide photocatalysts have been widely reported for their excellent performance in the wastewater treatment. However, there is lack of information on the effect of different synthesis methods towards the properties and catalytic activity of the photocatalyst. In this research, a series of copper-doped titanium dioxide (Cu-TiO2) photocatalysts were synthesized via three different methods of sonochemical, impregnation and physical mixing. Cu-TiO2 with varied molar ratios of Cu dopant to TiO2 TR595 (100:0, 99:1, 98:2, 97:3 and 96:4) were prepared. Comparison of physical-chemical properties and photocatalytic activity among the synthesized samples were made. X-ray diffraction analysis depicted the formation of TiO2 rutile phase in all samples. Besides, diffuse reflectance UV-visible analysis proved that the synthesized samples were active under visible light region. According to the Tauc plot and photoluminescence spectra, the band gap energies and recombination rate of electron-hole pairs of Cu-TiO2 samples decreased upon loading of Cu. Moreover, EDX analysis confirmed the existence of Ti and Cu in all the samples. The photocatalytic efficiencies of the synthesized samples were discovered through photodegradation of Rhodamine B organic dye under 6 hours of visible light irradiation. Amongst, Cu-TiO2 photocatalysts synthesized via sonochemical method with molar ratio of 98:2 produced the highest photocatalytic activity of 64.8% which attributed to the lowest recombination rate of photogenerated charge carriers and availability of large number of reactive oxidative species.

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Section: Introductionmentioning

confidence: 99%

Effect of Synthesis Methods on Properties of Copper Oxide Doped Titanium Dioxide Photocatalyst in Dye Photodegradation of Rhodamine B

Leong

Teh

Chen

et al. 2022

Sci.Technol.Indonesia

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“…Therefore, it is desirable to reduce the band gap of anatase TiO 2 to be active under visible region. Several approaches had been used including doping of metal and non-metal as well as modi cation of the surfaces (Koh et al, 2017;Ooi et al, 2020;Ooi et al, 2016;Lee et al, 2016). Doping of TiO 2 with metals has a major drawback that the photocatalytic activity of metal doped TiO 2 could be in uenced by dopant concentration.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Titanium Dioxide Nanotubes with Different N-Containing Ligands via Hydrothermal Method

Leong

Koh

et al. 2021

sci. technol. indones.

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Titanium dioxide (TiO2) nanotubes (TNT) were successfully synthesized using different N-containing ligands via hydrothermal method. Methylamine, ethylenediamine and diethylenetriamine with different Ti/ligand molar ratios (1:1, 1:3, 1:5 and 1:8) were prepared. As-synthesized TiO2 without N-containing ligands were also prepared for comparison purpose. The X-Ray Diffraction patterns confirmed the presence of anatase phase of TiO2 in all the synthesized samples whereas the presence of sodium titanate was only detected in the samples containing N-containing ligands. The Transmission Electron Microscopy images also showed that the N-containing ligands promoted the formation of nanotubes in the anatase TiO2. Based on the Tauc Plot, the band gap energy of anatase TiO2 was shifted with the addition of methylamine, ethylenediamine and diethylenetriamine. The photoluminescence spectra also showed that with the addition of sufficient amount of N-containing ligands, the intensity of photoluminescence spectrum decreased, suggesting formation of more nanotube and reduction of electron hole recombination rate. The photocatalytic performance of all synthesized samples was determined through photodegradation of Congo red under UV light for 6 hours. The results suggested that among the synthesized materials, the sample which contained diethylenetriamine with molar ratio of 5 gave the highest photocatalytic activity of 76.71% which could be attributed to successful formation of nanotube, its higher surface rate reaction and low electron hole recombination. Diethylenetriamine showed higher efficiency in assisting the formation of TiO2 nanotubes compared to methylamine and ethylenediamine.

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“…Phenolic compounds, as a kind of ubiquitous, toxic, and harmful pollutants, have attracted extensive attention [1][2][3] . Advanced oxidation technology shows certain advantages over traditional microbial methods and physical adsorption methods in the treatment of phenolic pollutants, such as higher efficiency, more thorough reaction, and no secondary pollution [4,5] . Electrochemical advanced oxidation technology has been widely used because of its advantages of space-saving, easy operation, and high efficiency [6,7] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pd/CeOx/Nano-graphite composite cathode for electro-catalytic degradation of phenol

Zhang

et al. 2021

ACE

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To improve the cathode electro-catalytic degradation performance of electrochemical advanced oxidation processes (EAOP), Pd metal and CeOx co-modified Nano-graphite (Pd/CeOx/Nano-G) composite was synthesized by chemical precipitation and reduction methods, and Pd/CeOx/Nano-G cathode was prepared by a hot-pressing method. The as-prepared composite and electrode were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electrons microscopy. Results revealed that the mix-crystal structural CeOx (Ce2O3 and CeO2) and Pd0 metal were formed. The cathode was applied for the electro-catalytic degradation of phenol wastewater. The degradation efficiency of phenol by Pd1.0/CeOx5.0/Nano-G cathode reached 99.6% within 120 min degradation, which were higher than that of CeOx5.0/Nano-G and Nano-G cathodes. Both of the Pd metal and CeOx could improve the O2 reduction to H2O2 and promote the H2O2 dissociation to •OH for phenol oxidation. Additionally, the effects of electro-catalytic reaction parameters on the phenol degradation were investigated. The results indicated that Pd/CeOx/Nano-G cathode would have promise for further practical application in organic wastewater treatment.

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Phenol photocatalytic degradation over mesoporous TUD-1-supported chromium oxide-doped titania photocatalyst

Cited by 19 publications

References 35 publications

Effect of Synthesis Methods on Properties of Copper Oxide Doped Titanium Dioxide Photocatalyst in Dye Photodegradation of Rhodamine B

Effect of Synthesis Methods on Properties of Copper Oxide Doped Titanium Dioxide Photocatalyst in Dye Photodegradation of Rhodamine B

Synthesis of Titanium Dioxide Nanotubes with Different N-Containing Ligands via Hydrothermal Method

Synthesis of Pd/CeOx/Nano-graphite composite cathode for electro-catalytic degradation of phenol

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