Treatment of Diphenhydramine with different AOPs including photo-Fenton at circumneutral pH

López, Núria; Racionero-Plaza, Sandra; Afkhami, Arsalan; Marco, P.; Giménez, José Carlos Moreno; Esplugas, Santiago

doi:10.1016/j.cej.2016.05.127

Cited by 36 publications

(15 citation statements)

References 29 publications

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“…8). 32,33 In summary, from the intermediates determined it appears that the oxidation process occurs mainly through the hydroxyl radicals. However, the results from the scavenger experiments indicated that the superoxide anions also play an important role.…”

Section: Identication Of Degradation Products and Pathwaysmentioning

confidence: 95%

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Photocatalytic degradation of diphenhydramine in aqueous solution by natural dolomite

Song

et al. 2020

RSC Adv.

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Section: Identication Of Degradation Products and Pathwaysmentioning

confidence: 95%

“…As shown in Table 3, the photocatalytic process leads to the formation of m/z 183, m/z 272, and m/z 167, which were also detected in the previous studies. 15,31,33 Among the observed products, m/z of 272 could be attributed to the hydroxylation of DP (m/z 256) (Fig. 8).…”

Section: Identication Of Degradation Products and Pathwaysmentioning

confidence: 98%

Photocatalytic degradation of diphenhydramine in aqueous solution by natural dolomite

Song

et al. 2020

RSC Adv.

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“…Despite these common techniques, research interest also has been devoted towards exploring promising technologies able to destroy the hazardous organic compounds, rather than transferring the pollutants from one phase to another [6]. Such methods are known as advanced oxidation processes (AOPs) that imply the destructive oxidation of organic pollutants [6][7][8]. Hence, AOPs deal with homogenous catalysis and photocatalysis (Fenton, H 2 O 2 /UV, Fenton-like [7,8]), heterogeneous catalysis (CWPO-Catalytic Wet Peroxide Oxidation) [9], heterogeneous photocatalysis (TiO 2 /UV) [6,8] and others (e.g., catalytic ozonation [10]).…”

Section: Introductionmentioning

confidence: 99%

“…Such methods are known as advanced oxidation processes (AOPs) that imply the destructive oxidation of organic pollutants [6][7][8]. Hence, AOPs deal with homogenous catalysis and photocatalysis (Fenton, H 2 O 2 /UV, Fenton-like [7,8]), heterogeneous catalysis (CWPO-Catalytic Wet Peroxide Oxidation) [9], heterogeneous photocatalysis (TiO 2 /UV) [6,8] and others (e.g., catalytic ozonation [10]). According to the AOPs mechanism, the toxic pollutants are transformed into less hazardous compounds with a diminished impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Development of Porous Titania Structure with Improved Photocatalytic Activity: Response Surface Modeling and Multi-Objective Optimization

et al. 2020

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Porous titania was successfully synthesized by an ultrasound-assisted sol-gel route. The synthesis process was empirically modeled and optimized using the response surface methodology (RSM). Input variables adopted for optimization dealt with the weight ratio of precursors (r) and the sonication time (t), representing the used factors in the synthesis procedure. With regard to application, the synthesized TiO2 samples were tested for the photodegradation of two water-soluble organic pollutants under UV–Vis irradiation. Optimal conditions for the efficient pollutants’ photodegradation were found to involve a precursors ratio of 3 and a sonication time of 60 min. Thus, the M5 sample prepared under the founded optimal conditions yielded the maximal removal efficiencies of 98.4% and 46.3% for the photodegradation of CR dye and 2,4-D herbicide, respectively. In addition, the photodegradation kinetics revealed the pseudo first-order rate constants, showing the photodegradation of CR (k1 = 8.86 × 10−2 min−1) by M5 sample is about 1.3-fold faster than the photodegradation of 2,4-D pesticide (k2 = 6.84 × 10−2 min−1).

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“…Therefore photo-Fenton process is much more efficient in the •OH generation compared with the conventional Fenton process [76,77]. Viewing this fact, many studies have been performed to employ photo-Fenton technique for micropollutant removal, and removal efficiency depends greatly on the pH of reaction solution, Fe 2+ and H2O2 dosages [63,76,[78][79][80][81][82]. Usually, acidic pH (lower than 3) is required in Fenton processes to obtain good solubility of the iron ions [83], which is one of the main drawbacks of Fenton based techniques.…”

Section: Photo-fenton Processesmentioning

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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Treatment of Diphenhydramine with different AOPs including photo-Fenton at circumneutral pH

Cited by 36 publications

References 29 publications

Photocatalytic degradation of diphenhydramine in aqueous solution by natural dolomite

Photocatalytic degradation of diphenhydramine in aqueous solution by natural dolomite

Development of Porous Titania Structure with Improved Photocatalytic Activity: Response Surface Modeling and Multi-Objective Optimization

Micropollutant degradation in water by photochemical processes

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