From micro to macro-contaminants: The impact of low-energy titanium dioxide photocatalysis followed by filtration on the mitigation of drinking water organics

Mayer, Brooke K.; Johnson, Carlan C.; Yu, Yang; Wellenstein, Nicole; Maher, Emily K.

doi:10.1016/j.chemosphere.2018.10.213

Cited by 12 publications

(11 citation statements)

References 57 publications

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“…Their degradation plays a significant role in the transformation of insecticide, herbicide, and fungicide molecules into residues that are susceptible to the same forces of movement or to further degradation in the environment. Techniques for the elimination of those organic compounds from water sources include filtration [15], ozone treatment [15], electrical oxidation [16], and degradation by heat [17] and UV radiation [18,19,20]. These treatment routes in aqueous systems may offer solutions for the industrial management of contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characterization of Mancozeb Degradation for Wastewater Treatment Using a Sensor Based on Poly (3,4-ethylenedioxythiophene) (PEDOT) Modified with Carbon Nanotubes and Gold Nanoparticles

et al. 2019

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Mancozeb is a worldwide fungicide used on a large scale in agriculture. The active component and its main metabolite, ethylene thiourea, has been related to health issues. Robust, fast, and reliable methodologies to quantify its presence in water are of great importance for environmental and health reasons. The electrochemical evaluation of mancozeb using a low-cost electrochemical electrode modified with poly (3,4-ethylene dioxythiophene), multi-walled carbon nanotubes, and gold nanoparticles is a novel strategy to provide an in-situ response for water pollution from agriculture. Additionally, the thermal-, electrochemical-, and photo-degradation of mancozeb and the production of ethylene thiourea under controlled conditions were evaluated in this research. The mancozeb solutions were characterized by electrochemical oxidation and ultraviolet-visible spectrophotometry, and the ethylene thiourea concentration was measured using ultra-high-performance liquid chromatography high-resolution mass spectrometry. The degradation study of mancozeb may provide routes for treatment in wastewater treatment plants. Therefore, a low-cost electrochemical electrode was fabricated to detect mancozeb in water with a robust electrochemical response in the linear range as well as a quick response at a reduced volume. Hence, our novel modified electrode provides a potential technique to be used in environmental monitoring for pesticide detection.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Characterization of Mancozeb Degradation for Wastewater Treatment Using a Sensor Based on Poly (3,4-ethylenedioxythiophene) (PEDOT) Modified with Carbon Nanotubes and Gold Nanoparticles

et al. 2019

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“…In addition to DOC measurements, UV-VIS 254 measurements were collected for EC experiments to characterize the removal of organic matter. All glassware for DOC testing were acid washed in 5% HCl solution and baked at 550°C (Mayer et al, 2019). The iron electrodes were acid washed (2 M sulfuric acid), rinsed with water, washed with Alconox Ò , and wet sanded with 320 grit fine sandpaper (Maher et al, 2019a(Maher et al, , 2019b (Panizza, 2010;Macpherson, 2015), and extremely high oxygen evolution overpotential (Panizza, 2010).…”

Section: Reactor Operationmentioning

confidence: 99%

“…Analytical measurements and quality assurance/ quality control The methods for estrogen analysis, sample preparation, spike and recovery experiments, standard curve preparation, limit of detection and limit of quantification determination, and quality assurance/quality control were previously reported (Maher et al, 2019a(Maher et al, , 2019bMayer et al, 2019). Briefly, E1, E2, E3, and EE2 were analyzed via liquid chromatography-mass spectrometry (LC-MS) using a Shimadzu LC-MS 2020 (Kyoto, Japan); additional details are provided in Sections S3 and S4 of the Supplementary Data (Supplementary Tables S2 and S3).…”

Section: Reactor Operationmentioning

confidence: 99%

“…UV-VIS 254 was measured with a spectrophotometer (Genesys 20; Thermo Scientific, Waltham, MA) in accordance with USEPA Method 415.3. The DOC measurements were used to quantify total dissolved organic matter in solution, whereas UV absorbance at a wavelength of 254 nm (UV-VIS 254 ) was indicative of the organic matter character (i.e., aromaticity) (Mayer et al, 2019). Residual iron concentrations following EC were measured as total soluble iron after filtration with a 25 mm, 0.45 lm syringe filter (Agela Technologies) via inductively coupled plasma mass spectrometry analysis (7700 Series; Agilent Technologies, Santa Clara, CA) (Maher et al, 2019a).…”

Section: Reactor Operationmentioning

confidence: 99%

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Removal of Estrogenic Compounds from Water Via Energy Efficient Sequential Electrocoagulation-Electrooxidation

Maher

O’Malley

Dollhopf

et al. 2020

Environmental Engineering Science

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The purpose of this study was to investigate energy reduction using electrocoagulation (EC) followed by electrooxidation (EO) targeting initial removal of dissolved organic carbon (DOC) during EC and subsequent removal of estrogenic compounds in EO. EC offers benefits over conventional coagulation such as in situ generation of coagulant but is not practical for removing estrogenic compounds. Advanced oxidation processes, including EO, can effectively remove micropollutants such as estrogenic compounds but are hindered by the presence of bulk organic matter. This study investigated four estrogenic compounds from the U.S. EPA's Contaminant Candidate List: estrone (E1), 17b-estradiol (E2), estriol (E3), and 17a-ethynylestradiol (EE2). First, EC (iron electrodes) was employed to remove humic acid and improve downstream removal of estrogenic compounds while reducing overall energy consumption in EO (boron-doped diamond electrodes). The sequential EC and EO system effectively reduced overall electrical energy per order (EEO) by more than half compared with EO alone for each estrogenic compound. The system also effectively removed humic acid and estrogenic compounds. An EC current density of 8.88 mA/cm 2 and electrolysis time of 8 min with a flocculation stir rate of 40 rpm (G = 23 s-1) achieved the greatest DOC and UV-VIS 254 removal. EO treatment achieved the highest estrogenic compound removal at a current density of 22.2 mA/cm 2. Initial humic acid sodium salt concentration (0-60 mg/L C) had an effect on EC iron dose and estrogenic compound removal. The EEO for EC-EO treatments was lower than EC alone, EO alone, UV photolysis, UV photocatalysis, and ozone but was higher than a photocatalytic reactor membrane and UV/H 2 O 2. Overall, the EC-EO system was effective at removing bulk organic matter during EC and estrogenic compounds during EO. EC-EO reduced overall energy demand, indicating that this system should be developed further as an advanced technology that could efficiently remove micropollutants.

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“…The objective of this study was to investigate the fundamental interactions of BPA with TiO 2 nanoparticles in the process of developing an accurate method for the determination of BPA in complex heterogeneous sample matrices. TiO 2 (as opposed to other nanoparticles) was chosen in the present work, because it is commonly used in water purification to mitigate organic contaminants, to remove humic acid, and to photodegrade pesticides [40][41][42][43]. TiO 2 is also commonly applied as a nondairy whitener to enhance the brightness of food products (including cake icing/frosting, cheese, ice cream, skim/soy milk, and yogurt) and as a white pigment in personal care products (such as toothpaste) [44,45].…”

Section: Introductionmentioning

confidence: 99%

Ion-Trap Mass Spectrometric Analysis of Bisphenol A Interactions With Titanium Dioxide Nanoparticles and Milk Proteins

2020

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Quantitative analysis of endocrine-disrupting molecules such as bisphenol A (BPA) in freshwater to determine their widespread occurrence in environmental resources has been challenged by various adsorption and desorption processes. In this work, ion trap mass spectrometry (ITMS) analysis of BPA was aimed at studying its molecular interactions with titanium dioxide (TiO2) nanoparticles and milk whey proteins. Addition of sodium formate prevented TiO2 nanoparticles from sedimentation while enhancing the electrospray ionization (ESI) efficiency to produce an abundance of [BPA + Na]+ ions at m/z 251.0. More importantly, the ESI-ITMS instrument could operate properly during a direct infusion of nanoparticles up to 500 μg/mL without clogging the intake capillary. Milk protein adsorption of BPA could decrease the [BPA + Na]+ peak intensity significantly unless the proteins were partially removed by curdling to produce whey, which allowed BPA desorption during ESI for quantitative analysis by ITMS.

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From micro to macro-contaminants: The impact of low-energy titanium dioxide photocatalysis followed by filtration on the mitigation of drinking water organics

Cited by 12 publications

References 57 publications

Electrochemical Characterization of Mancozeb Degradation for Wastewater Treatment Using a Sensor Based on Poly (3,4-ethylenedioxythiophene) (PEDOT) Modified with Carbon Nanotubes and Gold Nanoparticles

Electrochemical Characterization of Mancozeb Degradation for Wastewater Treatment Using a Sensor Based on Poly (3,4-ethylenedioxythiophene) (PEDOT) Modified with Carbon Nanotubes and Gold Nanoparticles

Removal of Estrogenic Compounds from Water Via Energy Efficient Sequential Electrocoagulation-Electrooxidation

Ion-Trap Mass Spectrometric Analysis of Bisphenol A Interactions With Titanium Dioxide Nanoparticles and Milk Proteins

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