Photocatalytic degradation of 4-chloro-2-methylphenoxyacetic acid using W-doped TiO2

Oseghe, Ekemena O.; Ndungu, Patrick; Jonnalagadda, Sreekantha B.

doi:10.1016/j.jphotochem.2015.07.014

Cited by 54 publications

(21 citation statements)

References 51 publications

(57 reference statements)

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“…These results show clearly that the photocatalytic activity does not depend only on the band gap but the annealing temperature and doping content can play an important role in enhancing the photocatalytic activity. [42,43] Similar results were reported by De los Santos et al [51] This synergistic effect of photocatalytic characteristics was also highlighted by Oseghe et al, [24] for MCPA photocatalytic degradation under W-doped Titania. The new phase W y Ti 1-y O 2 appeared during the preparation of the sample 5W-900 enhancing the photocatalyst activity under visible light.…”

Section: Photocatalytic Activitysupporting

confidence: 77%

“…Indeed, it is commonly in the 6+ oxidation state with a smaller ionic radius than Ti 4+ . Oseghe et al [24] attributed the high photocatalytic performance of synthesized W-TiO 2 in 2-methyl-4-chlorophenoxyacetic acid (MCPA) degradation to the synergistic effect of its photocatalytic characteristics. [21] Furthermore, the doping of TiO 2 with tungsten has many advantages.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Moslah

Aguilar

Alcántara

et al. 2018

J Chinese Chemical Soc

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A series of tungsten‐doped Titania photocatalysts were synthesized using a low‐temperature method. The effects of dopant concentration and annealing temperature on the phase transitions, crystallinity, electronic, optical, and photocatalytic properties of the resulting material were studied. The X‐ray patterns revealed that the doping delays the transition of anatase to rutile to a high temperature. A new phase WyTi1‐yO2 appeared for 5.00 wt% W‐TiO2 annealed at 900 °C. Raman and diffuse reflectance UV–Vis spectroscopy showed that band gap values decreased slightly up to 700 °C. X‐ray photoelectron spectroscopy showed that surface species viz. Ti3+, Ti4+, O2−, oxygen‐vacancies, and adsorbed OH groups vary depending on the preparation conditions. The photocatalytic activity was evaluated via the degradation of methylene blue using LED white light. The degradation rate was affected by the percentage of dopants. The best photocatalytic activity was achieved with the sample labeled 5.00 wt% W‐TiO2 annealed at 700 °C.

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Section: Photocatalytic Activitysupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Moslah

Aguilar

Alcántara

et al. 2018

J Chinese Chemical Soc

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“…12 Previously, we reported the degradation of different pesticides and dyes, using ozone facilitated AOPs and heterogeneous catalysts, including dechlorination of tetrachloro-obenzoquinone using cesium doped mixed oxides, chloronitrophenol using Ce-V doped mixed metal oxides and photo degradation of 4-chloro-2-methylphenoxyacetic acid using W-doped TiO 2 . [13][14][15] In this communication, we report the synthesis of four different lanthanide doped TiO 2 materials, their characterization and potential as photo catalysts in degradation of model compound, caffeine under visible light irradiation in aqueous medium.…”

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confidence: 99%

Synthesis of lanthanide-doped TiO₂nanoparticles and their photocatalytic activity under visible light

2019

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Four different lanthanide (Ce, Dy, Lu, and Sm) doped TiO2 mesoporous materials were synthesised using the sol–gel method with titanium (IV) isopropoxide as the precursor. All of the synthesized materials were characterised using different analytical techniques, BET, PXRD, TEM, SEM-EDX, Raman, FTIR, photoluminescence, and UV-DRS spectroscopy. Photocatalytic activity and efficacy of the materials in the degradation of caffeine in aqueous solutions was investigated under visible light illumination. Although all materials showed good photocatalytic activity, Ce-doped TiO2 exhibited relatively better activity than the other three catalysts. High photoactivity of the catalysts was attributed to the presence of lanthanides and their ability to generate ions that scavenge electrons under visible light, thereby enhancing photodegradation of caffeine. All materials proved to be good and were recyclable without loss of catalytic activity up to three runs. An intermediate [N-1,3,6-trimethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)formamide] (TDTF) and two products (6-amino-1,3-dimethyl-2,4-dioxo-1,2,3,4-tetrahydropymidin-5-ly)-(methyl)-carbamic acid (ATCA) and N-methyl-N-(methylcarbomoyl)-2-oxoacetamide (MMO) were identified by the LC–MS spectra.

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“…TiO2 for photocatalytic removal of various micropollutants [110][111][112][113][114], e.g. 2-methyl-4chlorophenoxyacetic acid (MCPA) [115][116][117], mecoprop [118], clopyralid [118], metoprolol [104,119], 2,4-Dichlorophenoxyacetic Acid (2,4-D) [120], etc. For instance, Calza et al [61] reported efficient diclofenac removal over aqueous TiO2 suspensions.…”

Section: Figure 1 2 Schematic Representation Of Principles Of Photocmentioning

confidence: 99%

“…Given this context, many water treatment techniques have been tested for cleaning MCPA contaminated water, and among them photocatalysis has received increasing research interests [115,116], with a focus on TiO2. TiO2 is commonly used because it has relatively high quantum efficiency, easy accessibility, low toxicity, and high chemical/physical stability.…”

Section: Introductionmentioning

confidence: 99%

Micropollutant degradation in water by photochemical processes

Yin¹

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Fast growing global population and economy result in an increasing water consumption worldwide. However, the amounts of usable water resources are limited: more than one-third of the accessible renewable fresh water on Earth is being exploited for industrial, agricultural, as well as domestic usage [1]. Locally, especially in water scarce areas, this is often reaching much higher levels, leading to overdraft of water resources [2]. Such facts call for the need to not only exploit new and alternative water resources but also to recycle water streams, to cope with the unfortunate increasing limitations in availability of fresh water sources. Meanwhile, the fast growing population and economy are leading to serious water pollution due to discharge of numerous contaminants into the environment, which in turn possess sever threats to the quality of water resources. Thus, the increasing worldwide demand for water consumption, the limited amount of water resources, and the water pollution make water treatment a vital measure to safeguard the water supply with sufficient quantity and quality that meets the demand of the society. Conventionally, concerns were given to pathogens, nutrients, heavy metals, suspended solids, and bulk organic pollutants (the amount of bulk organic pollutants generally present in concentrations at 0.1-10 g/l in waste water and often denoted with COD or BOD, meaning chemical or biological oxygen demand). Thus in most parts of the world water purification measures have been taken to tackle these problems [3, 4]. In recent decades, many emerging organic pollutants (generally present at rather low concentrations, i.e. ng/L to µg/L level, and therefore also termed as micropollutants). These include pharmaceuticals, antibiotics, herbicides, pesticides, chemicals from personal care products, etc., and have been detected the last two decades extensively in different water bodies worldwide. For instance, many pharmaceuticals were found in various portions of the aquatic system, i.e. in ground water, surface water, as well as in many drinking water sources according to a broad range of studies [5-11]. In a study conducted by Félix-Cañedo et al. in Mexico City, the presence of a group of organic micropollutants (including pharmaceuticals, hormones, herbicides) in several drinking water sources was reported, at concentrations ranging from ng/L to µg/L level [12]. In recent years, a broad range of micropollutants, including Other investigated homogeneous photochemical processes include UV/Cl2, UV/O3, UV/HOCl, UV/ClO2. Application of these techniques for removal of various micropollutants has been studied over last decades. It is reported that UV/Cl2 could achieve relatively good removal of carbamazepine from wastewater, but formation of toxic chlorinated byproducts was an issue [132, 133]. Kong et al. reported efficient degradation of atrazine by UV/Cl2 [134]. Examples of micropollutant removal by UV/O3, UV/HOCl, UV/ClO2, etc., are also abundant in literature [135-138]. 1.3 Research opportunities 1.3.1 Rese...

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Photocatalytic degradation of 4-chloro-2-methylphenoxyacetic acid using W-doped TiO2

Cited by 54 publications

References 51 publications

Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of lanthanide-doped TiO₂nanoparticles and their photocatalytic activity under visible light

Micropollutant degradation in water by photochemical processes

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Photocatalytic degradation of 4-chloro-2-methylphenoxyacetic acid using W-doped TiO2

Cited by 54 publications

References 51 publications

Synthesis of W‐doped TiO2 by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of W‐doped TiO2 by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of lanthanide-doped TiO2nanoparticles and their photocatalytic activity under visible light

Micropollutant degradation in water by photochemical processes

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Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of W‐doped TiO₂ by low‐temperature hydrolysis: Effects of annealing temperature and doping content on the surface microstructure and photocatalytic activity

Synthesis of lanthanide-doped TiO₂nanoparticles and their photocatalytic activity under visible light