Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

Birben, Nazmiye Cemre; Uyguner-Demirel, Ceyda Senem; Kavurmaci, Sibel Şen; Gürkan, Yelda Yalçın; Türkten, Nazlı; Çınar, Zekiye; Bekbölet, Miray

doi:10.1016/j.cattod.2016.06.020

Cited by 84 publications

(37 citation statements)

References 32 publications

(44 reference statements)

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“…However, with the higher concentration (7.5 to 10 mg/L) of humic acid, the obvious change had not taken place (4 log after 160 s). According to previous studies [16,27], the photocatalytic disinfection of phage f2 involved several active radicals, while hydroxyl radicals proved to be the most important role. With the participation of humic acid in photocatalytic process, the competitive relationship between the phage f2 and humic acid was established, which led to a significant decrease in the photocatalytic disinfection of phage f2 [27].…”

Section: Effect On Photocatalysismentioning

confidence: 89%

“…According to previous studies [16,27], the photocatalytic disinfection of phage f2 involved several active radicals, while hydroxyl radicals proved to be the most important role. With the participation of humic acid in photocatalytic process, the competitive relationship between the phage f2 and humic acid was established, which led to a significant decrease in the photocatalytic disinfection of phage f2 [27]. On the other hand, the photocatalytic disinfection reaction is based on the surface complexation reactions rather than the reactions taking place in aqueous medium [27].…”

Section: Effect On Photocatalysismentioning

confidence: 89%

“…With the participation of humic acid in photocatalytic process, the competitive relationship between the phage f2 and humic acid was established, which led to a significant decrease in the photocatalytic disinfection of phage f2 [27]. On the other hand, the photocatalytic disinfection reaction is based on the surface complexation reactions rather than the reactions taking place in aqueous medium [27]. As previously described and mentioned (Figure 1), the addition of humic acid greatly reduced the adsorption ability of the TiO 2 -P25 photocatalysts to the phage f2, and further wakened the corresponding efficiency of photocatalytic disinfection.…”

Section: Effect On Photocatalysismentioning

confidence: 99%

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Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

et al. 2018

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In the actual water environment, the health risk of waterborne viruses is evaluated to be 10 1 -10 4 times higher at a similar level of exposure compared with bacteria and has aroused strong concern in many countries in the world. Photocatalytic membrane reactor (PMR), a new process for virus inactivation in water, has gradually become one of the main tools to inactivate pathogenic organisms in water. However, there is relatively little attention to the effect of natural organic matters (NOMs) on the PMR system, which actually exists in the water environment. In this paper, the TiO 2 -P25, a common type in sales and marketing, was selected as the photocatalyst, and humic acid was regarded as the representative substance of NOMs for investigating thoroughly the influence of humic acid on virus removal by the PMR system. It was found that competitive adsorption between the virus and humic acid occurred, which markedly reduced the amount of virus adsorbed on the surface of the photocatalyst. Moreover, with humic acid, the direct contact behavior between the virus and the photocatalyst was blocked to some extent, and the disinfection of phage f2 by the active free radicals produced by photocatalysis was furthermore badly affected. Meanwhile, the special structure of humic acid, which made humic acid be able to absorb light of 270-500 nm, led to the reduction of photocatalytic efficiency. Further experiments showed that when there was a certain concentration of humic acid in water, intermittent operation mode or higher membrane flux (>40 L/(m 2 ·h)) was selected to partly alleviate the adverse effects of humic acid.

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Section: Effect On Photocatalysismentioning

confidence: 89%

Section: Effect On Photocatalysismentioning

confidence: 89%

Section: Effect On Photocatalysismentioning

confidence: 99%

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Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

et al. 2018

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“…A great increase in the efficiency of solar light photocatalysis was explained by the extension of TiO 2 absorption band from the UV into the visible region [66]. In a study by Birben et al [58], a reduction in band gap energy of both bare P-25 and UV-100 TiO 2 specimens to 2.55 eV and 2.43 eV, respectively, was caused by Fe doping. In terms of solar photocatalytic activity in a period of 1 h, approximately 50% of HA in UV absorbance at 254 nm was degraded by Fe-doped TiO 2 specimens.…”

Section: Enhance Light Absorptionmentioning

confidence: 99%

“…To overcome those limitations, in terms of removing HA, many studies involving modified TiO 2 photocatalytic have been carried out with certain success. The comparison of using a modified TiO 2 photocatalyst for the removal of HA under various experimental conditions is compared in Table 1 [20,[51][52][53][54][55][56][57][58][59][60][61][62].…”

Section: Enhancement Of Ha Removal By the Modification Of Tio 2 Photomentioning

confidence: 99%

Removing Humic Acid from Aqueous Solution Using Titanium Dioxide: A Review

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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Natural organic matter (NOM) is defined as a complex matrix of organic materials present in all surface, ground, and soil waters [1]. The presence of NOM, mainly humic substances (HS) in surface waters, constitutes the main route for the absorbance of solar energy in aquatic systems through which a series of photophysical and photochemical processes occur. Humic acid (HA) accounts for a significant fraction of the HS.The presence of HA in aqueous solutions is not directly toxic but could lead to organic disinfectant by-products (DBPs), which are undesired and hazardous products in water treatment after disinfection [2][3]. Furthermore, the high HA concentration in drinking water has the potential for some serious diseases, such as stomach cancer [4][5]. Thus, the presence of HA can be the cause of many problems, and their removal from water is a priority task [6] and has been attempted in different ways. Several processes have been attempted to remove HA from water such as coagulation [7-9], electrocoagulation (EC) [4,[10][11][12][13][14][15], electro-oxidation (EO) [16], ion exchange [17], membrane filtration [18-20], activated carbon adsorption and advanced oxidation processes [21-29]. AbstractRecently, the photocatalytic degradation technique with titanium dioxide (TiO 2 ) has been widely applied for the degradation of humic acid (HA) from aqueous solution due to its ability to achieve complete mineralization of organic contaminants. Because TiO 2 is the most commonly used semiconductor photocatalyst, efforts on the modification of TiO 2 in order to improve catalyst efficiency were presented in this review manuscript. The key photoreactor operation parameters such as TiO 2 loading, pH, temperature, oxygen concentration, concentration and nature of HA, light wavelength, light intensity, the presence of inorganic ions and mechanistic pathway for pollutant removal, and the formation of the intermediates and their effects on the mineralization and disinfection of the photo-process were also assessed. Although we can see an increase in the number of papers that have been published in this area, further progress is needed to improve the understanding of the dynamic interactions between TiO 2 photocatalytic oxidation process and HA, as well as to suggest possible future developments in this promising field.

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A facile synthesis of bio‐inspired hierarchical microstructure TiO₂: Characterization and photocatalytic activity

Türkten

Karataş

Karatas

et al. 2022

Env Prog and Sustain Energy

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Hierarchical photocatalysts have attracted notable concern due to their excellent features such as lower density, higher specific surface area, higher light-harvesting efficiency, and good surface permeability. Generally, such particular properties are achieved via the use of templates, preferentially focusing on natural biological materials.In this respect, rice husk (RH), an environmental waste containing elements C, N, S, and Si was used as a biotemplate to prepare TiO 2 hierarchical microstructure photocatalyst (TiO 2 -HMP) along with TiO 2 nanoparticle photocatalyst (TiO 2 -NP) by a facile sol-gel method. RH and the prepared TiO 2 photocatalysts were characterized by using Fourier transform infrared (FTIR), X-ray powder diffraction (XRD), environmental scanning electron microscope-energy dispersive X-ray analysis (ESEM-EDAX), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (UV-DRS), photoluminescence (PL), and Brunauer-Emmett-Teller (BET) methods. The combination of RH and TiO 2 via biotemplate strategy not only altered the band gap (E bg = 2.74 eV) also slightly increased the surface area ($10%). The photocatalytic activities of TiO 2 -NP and TiO 2 -HMP specimens were determined by degradation of 4-nitrophenol (4-NPh) under UV-A light irradiation. TiO 2 -HMP exhibited enhanced photocatalytic activity (≥10%) compared to TiO 2 -NP most probably due to RH originated in-situ self-codoping by the presence of multidopant ions (C, N, S, and Si ions) as verified by EDAX elemental weight distribution profiles. These results demonstrated a beneficial use of an environmental waste in photocatalytic applications.

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Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

Cited by 84 publications

References 32 publications

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Removing Humic Acid from Aqueous Solution Using Titanium Dioxide: A Review

A facile synthesis of bio‐inspired hierarchical microstructure TiO₂: Characterization and photocatalytic activity

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Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

Cited by 84 publications

References 32 publications

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Removing Humic Acid from Aqueous Solution Using Titanium Dioxide: A Review

A facile synthesis of bio‐inspired hierarchical microstructure TiO2: Characterization and photocatalytic activity

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Product

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A facile synthesis of bio‐inspired hierarchical microstructure TiO₂: Characterization and photocatalytic activity