Effectiveness of reactive oxygen species generated from rGO/CdS QD heterostructure for photodegradation and disinfection of pollutants in waste water

Afreen, Gul; Shoeb, Mohd; Upadhyayula, Sreedevi

doi:10.1016/j.msec.2019.110372

Cited by 49 publications

(11 citation statements)

References 45 publications

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“…However, some groups revealed that 1 O 2 may be produced through the oxidation of superoxide radical (•O 2 − ) under appropriate conditions [ [37] , [38] , [39] , [40] , [41] ]. To verify this hypothesis, we added 1,4-benzoquinone (BQ), a well-known quencher of •O 2 − [ 42 , 43 ], into the solution of TPEPy-I nanoaggregates. Interestingly, the introduction of BQ (340 μM) into the solution of TPEPy-I nanoaggregates inhibited bleaching of RNO remarkably ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Aggregation-induced emission luminogens for highly effective microwave dynamic therapy

Pandey

Wang

et al. 2022

Bioactive Materials

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Aggregation-induced emission luminogens (AIEgens) exhibit efficient cytotoxic reactive oxygen species (ROS) generation capability and unique light-up features in the aggregated state, which have been well explored in image-guided photodynamic therapy (PDT). However, the limited penetration depth of light in tissue severely hinders AIEgens as a candidate for primary or adjunctive therapy for clinical applications. Coincidentally, microwaves (MWs) show a distinct advantage for deeper penetration depth in tissues than light. Herein, for the first time, we report AIEgen-mediated microwave dynamic therapy (MWDT) for cancer treatment. We found that two AIEgens ( TPEPy-I and TPEPy-PF6 ) served as a new type of microwave (MW) sensitizers to produce ROS, including singlet oxygen ( 1 O 2 ), resulting in efficient destructions of cancer cells. The results of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and live/dead assays reveal that the two AIEgens when activated by MW irradiation can effectively kill cancer cells with average IC-50 values of 2.73 and 3.22 μM, respectively. Overall, the ability of the two AIEgens to be activated by MW not only overcomes the limitations of conventional PDT, but also helps to improve existing MW ablation therapy by reducing the MW dose required to achieve the same therapeutic outcome, thus reducing the occurrence of side-effects of MW radiation.

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Section: Resultsmentioning

confidence: 99%

Aggregation-induced emission luminogens for highly effective microwave dynamic therapy

Pandey

Wang

et al. 2022

Bioactive Materials

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“…Because of the ordered structure [6], MOFs are good candidates for preparing composite semiconductor materials with large surface area [7]. In the previous report, Bi 2 WO 6 and MOFs (such as UiO-66-NH 2 ) were combined to construct heterojunction, which showed the enhanced dispersion and speci c surface area of Bi 2 WO 6 and effectively improved the separation and transfer of photogenerated carriers [8]. Compared with Bi 2 WO 6 , the degradation e ciency of Rhodamine B and Phenol was increased by 1.5 times.…”

Section: Introductionmentioning

confidence: 97%

“…The degradation rate of tetracycline in nature is very slow, and the intermediate products are more toxic. The existing process could not completely remove tetracycline [2], so it is urgent to establish the effective degradation methods in the eld of environmental protection. Semiconductor photocatalysis technology has unique advantages for pollutant degradation because of its green and high e ciency.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Adsorption Synergistic Degradation of Tetracycline by Z-scheme Bi2WO6/ZIF-8

Dai¹,

Sheng²,

Wu³

et al. 2021

Preprint

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In this paper, in order to improved the photocatalytic activity of Bi2WO6, Bi2WO6 and ZIF-8 were successfully combined by in-situ growth method for the first time. The addition of ZIF-8 effectively inhibited the recombination of photogenerated electron hole pairs and further improved the electron utilization efficiency, and superoxide anion was introduced to greatly improve the photocatalytic activity. The performance of Bi2WO6/ZIF-8 in the photodegradation of tetracycline (TC) was studied under different conditions of proportions of ZIF-8, dosage of catalyst and concentration of TC. The results indicated that B/Z/5/1 (10mg) had the best photocatalytic activity, and 97.8% of TC (20mg/L) could be degraded in 80 minutes under UV light, the rate constant (k) for TC degradation was almost 3 times that of Bi2WO6. The effects of pH, HA and inorganic anions on the degradation of TC were studied in simulated real water. Further, B/Z/5/1 could be reutilized up to five cycles without reduction of efficiency and catalysis performance. Therefore, Bi2WO6/ZIF-8 heterojunction composite material can be utilized as an efficient photocatalyst for remediation of environmental pollution.

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“…The standard methods used for removal of azo dyes includes adsorption, ,, the photo-Fenton process, , and advanced oxidation processes (AOPs) . Among these, AOPs via photocatalytic degradation hold a huge potential toward the treatment of organic contaminants in aqueous media via the generation of reactive oxygen radicals/species, − with the advantage that upon treatment no secondary contaminants are produced.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Azo Dyes in Sunlight Promoted by Nitrogen–Sulfur–Phosphorus Codoped Carbon Dots

Saini

Aggarwal

Sonker

et al. 2021

ACS Appl. Nano Mater.

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Removal of organic contaminants such as azo dyes is highly desirable because of their toxicity, stability, and mutagenic properties. Herein an efficient method for the photodegradation of two well-known model azo dyes, namely metanil yellow (MY) and methyl orange (MO), under sunlight by multiple-heteroatomdoped carbon dots (CD) (nitrogen-, sulfur-, and phosphorusdoped-CD (NSP-CD)) is presented. The photodegradation results favored sunlight as a sustainable light source, as its value of t 1/2 is significantly less than that of artificial light (100 W tungsten bulb). Various parameters, such as the concentrations of individual dyes (20−100 ppm), a mixture of both dyes, changes in pH, and foreign/interfering ions, were investigated to understand the photocatalytic activity of NSP-CD. Under sunlight, photodegradation of ∼20 ppm of dye was observed in ∼60 min (for MY) and ∼90 min (for MO), respectively. A comparative NMR investigation was performed to confirm the photodegradation of the complex structural framework of azo dyes by NSP-CD. Moreover, to explore the real-life utility of the process, sunlight-promoted photodegradation experiments were conducted by externally spiking four different types of industrial samples. Spiking of MY and MO dyes with concentrations in the range of ∼15−23 ppm showed similar results of photodegradation.

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Effectiveness of reactive oxygen species generated from rGO/CdS QD heterostructure for photodegradation and disinfection of pollutants in waste water

Cited by 49 publications

References 45 publications

Aggregation-induced emission luminogens for highly effective microwave dynamic therapy

Aggregation-induced emission luminogens for highly effective microwave dynamic therapy

Photocatalytic Adsorption Synergistic Degradation of Tetracycline by Z-scheme Bi2WO6/ZIF-8

Photodegradation of Azo Dyes in Sunlight Promoted by Nitrogen–Sulfur–Phosphorus Codoped Carbon Dots

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