Adsorption of natural organic matter and disinfection byproduct precursors from surface water onto TiO 2 nanoparticles: pH effects, isotherm modelling and implications for using TiO 2 for drinking water treatment

Gora, Stephanie L.; Andrews, Susan A.

doi:10.1016/j.chemosphere.2017.01.125

Cited by 61 publications

(24 citation statements)

References 27 publications

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“…6). More interestingly, although many previous studies have documented that the acidic pH would benefit the adsorption of NOMs[211,221], only minor inhibitory effects were observed in the presence of NOMs at high concentration level (15 mg/L) under acidic conditions. This can be attributed to strengthened adsorption of MCPA[115] on TNA surface and therefore strengthened oxidation by valence band holes and surface adsorbed hydroxyl radicals, as well as largely strengthened photosensitization effect of NOMs(Figure 3.…”

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confidence: 87%

“…Secondly, NOM can also act as scavenger of •OH and h +[177], which are known as the primary oxidants in TiO2 photocatalytic systems[109,210]. Thirdly, NOMs can inhibit the target pollutant degradation via competitive adsorption on the TiO2 surface[211]. The inhibitory effect of NOM on TiO2 based photocatalytic micropollutant removal processes has been documented in previous studies on TiO2 slurry systems.…”

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confidence: 88%

“…Previous studies have pointed out that the pH conditions impose impact on the adsorption of NOMs on TiO2 surfaces [211,221]. Considering the adsorption of NOMs on the catalysts surface is a crucial factor contributing to its inhibitory effect, it is of importance to elucidate the effect of pH on the detrimental effect of NOM on the micropollutant removal performance of TNA.…”

Section: The Ph Influences the Effect Of Nomsmentioning

confidence: 99%

“…It has been documented that the pH of the reaction solution can affect the performance of various photochemical systems on degradation of organic pollutants [106,235]. Therefore, degradation of MCPA was studied at different initial pH (pH0) levels (ranging from 3 to 11) to examine the effect of pH on the performance of the TNA-Cu PFC system.…”

Section: Crucial Role Of Acidic Ph To Promote Mcpa Degradation Efficimentioning

confidence: 99%

“…On the contrary, a slight increase in the MCPA removal with increasing NOM concentration was observed. This finding can be attributed to two facts: (1) the alkaline conditions mitigate the competitive adsorption by NOMs[211,221]; and (2) the NOMs still impose photosensitization effect which can contribute to MCPA removal in the liquid phase(Figure 3. 6).…”

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confidence: 99%

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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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confidence: 87%

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confidence: 88%

Section: The Ph Influences the Effect Of Nomsmentioning

confidence: 99%

Section: Crucial Role Of Acidic Ph To Promote Mcpa Degradation Efficimentioning

confidence: 99%

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Micropollutant degradation in water by photochemical processes

Yin¹

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Synthesis, characterization, and application of α‐Fe₂O₃@TiO₂@SO₃H photo‐Fenton catalyst for photocatalytic degradation of biologically pre‐treated wood industry wastewater

Azimi

Shirini

Pendashteh

2022

Water Environment Research

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The efficiency of removing chemical oxygen demand (COD) and turbidity from wood wastewater was investigated using a sequencing batch reactor (SBR) and the photo‐Fenton process. A total of 94.78% of COD reduction and 99.9% of turbidity removal were observed under optimum conditions of SBR, which consisted of an organic loading rate (OLR) of 0.453 kg COD m−3 day−1, mixed liquor suspended solids (MLSS) of 4564 mg L−1, and cycle time of 48 h. A magnetic α‐Fe2O3@TiO2@SO3H nanocatalyst was prepared as a heterogeneous Fenton reagent. The Fourier transform infrared (FT‐IR), X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy‐dispersive X‐ray (EDX), and elemental mapping (MAP) analyses were performed to determine the structure and morphology of synthesized photocatalyst. The response surface methodology (RSM) was used to optimize the process based on a central composite design (CCD). The maximum photocatalytic degradation of 87.54% and COD reduction of 83.35% were achieved at a dosage of 0.6 g L−1 of catalyst, 30 mg L−1 of H2O2, and pH of 3.5 for 45 min. The results indicated that a combination of the SBR process and α‐Fe2O3@TiO2@SO3H could be used as an effective method for the treatment of wood wastewater. Practitioner Points A combination of the SBR and photo‐Fenton process was introduced as an impressive method for wood industry wastewater treatment. The efficiencies of COD, BOD5, NO3‐N, PO4‐P, and color removal were obtained according to the standard limits in Iran. To our knowledge, this study is the first report of the use of synthesized α‐Fe2O3@TiO2@SO3H photocatalyst for the wood industry wastewater treatment.

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Water Depollution by Advanced Oxidation Technologies

Loddo

Bellardita

Roda

et al. 2020

Nanotechnology in the Life Sciences

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Adsorption of natural organic matter and disinfection byproduct precursors from surface water onto TiO 2 nanoparticles: pH effects, isotherm modelling and implications for using TiO 2 for drinking water treatment

Cited by 61 publications

References 27 publications

Micropollutant degradation in water by photochemical processes

Micropollutant degradation in water by photochemical processes

Synthesis, characterization, and application of α‐Fe₂O₃@TiO₂@SO₃H photo‐Fenton catalyst for photocatalytic degradation of biologically pre‐treated wood industry wastewater

Water Depollution by Advanced Oxidation Technologies

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Adsorption of natural organic matter and disinfection byproduct precursors from surface water onto TiO 2 nanoparticles: pH effects, isotherm modelling and implications for using TiO 2 for drinking water treatment

Cited by 61 publications

References 27 publications

Micropollutant degradation in water by photochemical processes

Micropollutant degradation in water by photochemical processes

Synthesis, characterization, and application of α‐Fe2O3@TiO2@SO3H photo‐Fenton catalyst for photocatalytic degradation of biologically pre‐treated wood industry wastewater

Water Depollution by Advanced Oxidation Technologies

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Synthesis, characterization, and application of α‐Fe₂O₃@TiO₂@SO₃H photo‐Fenton catalyst for photocatalytic degradation of biologically pre‐treated wood industry wastewater