Utilizing UV-LED pulse width modulation on TiO2 advanced oxidation processes to enhance the decomposition efficiency of pharmaceutical micropollutants

Liang, Robert; Leuwen, Jocelyn C. Van; Bragg, Leslie M.; Arlos, Maricor J.; Fong, Lena C.M. Li Chun; Schneider, Olivia M.; Jaciw-Zurakowsky, Ivana; Fattahi, Azar; Rathod, Shasvat; Peng, Peng; Servos, Mark R.; Zhou, Yuanyuan

doi:10.1016/j.cej.2018.12.065

Cited by 51 publications

(25 citation statements)

References 47 publications

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“…The influence of these interactions is reflected in the relative degradation rates under continuous UV illumination, where MC-LR and MC-RR have degradations rates less than half that of MC-LA. These results are consistent with previous studies by Arlos et al and Liang et al, which showed that electrostatic forces between the pollutant and catalyst have a significant influence on the degradation rate [16,25]. The influence of electrostatic forces demonstrates the importance of considering the pH and the charge of target pollutants when treating water [26].…”

Section: Degradation Of Microcystins Under Continuous Lightsupporting

confidence: 93%

Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

et al. 2019

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Toxic microcystins (MCs) produced by freshwater cyanobacteria such as Microcystis aeruginosa are of concern because of their negative health and economic impacts globally. An advanced oxidation process using UV/TiO2 offers a promising treatment option for hazardous organic pollutants such as microcystins. The following work details the successful degradation of MC-LA, MC-LR, and MC-RR using a porous titanium–titanium dioxide (PTT) membrane under UV-LED light. Microcystin quantitation was achieved by sample concentration and subsequent LC–MS/MS analysis. The PTT membrane offers a treatment option that eliminates the need for the additional filtration or separation steps required for traditional catalysts. Controlled periodic illumination was successfully used to decrease the total light exposure time and improve the photonic efficiency for a more cost-effective treatment system. Individual degradation rates were influenced by electrostatic forces between the catalyst and differently charged microcystins, which can potentially be adjusted by modifying the solution pH and the catalyst’s isoelectric point.

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Section: Degradation Of Microcystins Under Continuous Lightsupporting

confidence: 93%

Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

et al. 2019

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“…Physicochemical properties such as charge, molecular weight, hydrophobicity, and molecular structure can affect photocatalytic degradation. Previous studies, including ours, show that the chemical structure of PPCPs can be correlated with their photocatalytic degradation [6,9]. Arlos et al [9] studied the degradation of 16 PPCPs using TiO 2 immobilized on porous support in ultrapure water under UV-LED exposure and indicated that ionic interactions can determine PPCP degradation.…”

Section: Effect Of Physicochemical Characteristicsmentioning

confidence: 80%

“…A total of 80 studies evaluated here, detailed in Table S1 in the Supplementary Materials (SI), including those from our lab [6][7][8][9][10], have intensively investigated the effect of parameters such as photocatalyst type and concentration, light intensity, pH, and organic and inorganic constituents in the background water (i.e., dissolved organic matter, suspended solids, and alkalinity) on PPCP degradation using TiO 2 treatment. Although these Catalysts 2021, 11, 576 2 of 11 studies have explored the photocatalytic removals of PPCPs in mixtures, approximately 70% of them investigated TiO 2 photocatalytic processes in a pure water matrix and only 30% of these studies have used surface water and wastewater effluents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Background Water Matrices on Pharmaceutical and Personal Care Product Removal by UV-LED/TiO2

et al. 2021

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In this study, we evaluated the effectiveness of UV-LED-irradiated TiO2 in removing 24 commonly detected PPCPs in two water matrices (municipal wastewater effluent and Suwannee River NOM–synthetic water) and compared their performance with that of ultrapure water. Relatively fast removal kinetics were observed for 29% and 12% of the PPCPs in ultrapure water and synthetic surface water, respectively (kapp of 1–2 min−1). However, they all remained recalcitrant to photocatalysis when using wastewater effluent as the background matrix (kapp < 0.1 min−1). We also observed that the pH-corrected octanol/water partition coefficient (log Dow) correlated well with PPCP degradation rate constants in ultrapure water, whereas molecular weight was strongly associated with the rate constants in both synthetic surface water and wastewater. The electrical energy per order (EEO) values calculated at the end of the experiments suggest that UV-LED/P25 can be an energy-efficient method for water treatment applications (2.96, 4.77, and 16.36 kW h m−3 in ultrapure water, synthetic surface water, and wastewater effluents, respectively). Although TiO2 photocatalysis is a promising approach in removing PPCPs, our results indicate that additional challenges need to be overcome for PPCPs in more complex water matrices, including an assessment of photocatalytic removal under different background water matrices.

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“…For example, Cai et al adopted UVA/LED/TiO 2 photocatalysis for the treatment of wastewater containing antibiotics and found that continuous UVA/LED/TiO 2 photocatalysis technology could remove >90% of 100 ppb sulfamethoxazole/trimethoprim [18]. Liang et al found that the periodic illumination-controlled UV-LED/TiO 2 process was effective for PPCP degradation and removal, with reduced energy requirements when using porous titanium-titanium dioxide substrates [19]. Dal et al found that UV-LED/TiO 2 processes were feasible for the decomposition of MB under suitable experimental conditions, demonstrating that UV-LEDs are effective as a light source for TiO 2 irradiation and has high potential for photodegradation [20].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Atenolol by TiO2 Irradiated with an Ultraviolet Light Emitting Diode: Performance, Kinetics, and Mechanism Insights

Ran

Wang

Fang³

et al. 2019

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Batch experiments were performed to investigate the effect of several environmental factors on atenolol (ATL) degradation efficiency, including catalyst crystal phase (anatase TiO 2 , rutile TiO 2 , and mixed phase), catalyst dosage, UV-LED wavelength and intensity, co-existing anions, cations, and pH. The mixed phase (2 g/L) exhibited the best photocatalytic activity at 365 nm, with ATL (18.77 µM) completely oxidized within 1 h. These results suggest that: (i) The mixed phase exhibits the highest activity due to its large specific surface area and excellent charge separation efficiency.(ii) ATL can be effectively degraded using mixed phase TiO 2 combined with UV-LED technology and the ATL degradation efficiency could reach 100% for 60 min; (iii) ATL photodegradation was more effective under 365 nm UV-LED than 254 nm, which was caused by the effect of light-induced charge separation; (iv) the ATL Degradation efficiency(De) decreased with an increase in initial ATL concentrations; and (v) co-existing anions and cations had different effects on the ATL De, mainly by changing the concentration of hydroxyl radicals. Considering that UV-LED is more energy-saving and environmentally friendly, and commercial TiO 2 is cheap and easy to obtain, our research provides feasibility for practical application.

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Utilizing UV-LED pulse width modulation on TiO2 advanced oxidation processes to enhance the decomposition efficiency of pharmaceutical micropollutants

Cited by 51 publications

References 47 publications

Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

Effect of Background Water Matrices on Pharmaceutical and Personal Care Product Removal by UV-LED/TiO2

Photocatalytic Degradation of Atenolol by TiO2 Irradiated with an Ultraviolet Light Emitting Diode: Performance, Kinetics, and Mechanism Insights

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