Synthesis of alginate/carbon nanotube/carbon dot/fluoroapatite/TiO2 beads for dye photocatalytic degradation under ultraviolet light

Mallakpour, Shadpour; Behranvand, Vajiheh; Mallakpour, Fereshteh

doi:10.1016/j.carbpol.2019.115138

Cited by 49 publications

(6 citation statements)

References 33 publications

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“…The efficiency of the prepared composite (AC-TiO 2 ) was compared with other reported carbon-modified TiO 2 based photocatalysts [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ] ( Table 2 ). The data were compared under different optimization conditions, and the comparison study gave the efficiency of the materials at specific reaction conditions.…”

Section: Resultsmentioning

confidence: 99%

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

et al. 2022

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The design and development of novel photocatalysts for treating toxic substances such as industrial waste, dyes, pesticides, and pharmaceutical wastes remain a challenging task even today. To this end, a biowaste pistachio-shell-derived activated carbon (AC) loaded TiO2 (AC-TiO2) nanocomposite was fabricated and effectively utilized towards the photocatalytic degradation of toxic azo dye Reactive Red 120 (RR 120) and ofloxacin (OFL) under UV-A light. The synthesized materials were characterized for their structural and surface morphology features through various spectroscopic and microscopic techniques, including high-resolution transmission electron microscope (HR-TEM), field emission scanning electron microscope (FE-SEM) along with energy dispersive spectra (EDS), diffuse reflectance spectra (DRS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, photoluminescence spectra (PL) and BET surface area measurements. AC-TiO2 shows enhanced photocatalytic activity compared to bare TiO2 due to the change in the bandgap energy and effective charge separation. The degradation rate of dyes was affected by the bandgap of the semiconductor, which was the result of the deposition weight percentage of AC onto the TiO2. The presence of AC influences the photocatalytic activity of AC-TiO2 composite towards RR 120 and OFL degradation. The presence of heteroatoms-enriched AC enhances the charge mobility and suppresses the electron-hole recombination in AC-TiO2 composite, which enhances the photocatalytic activity of the composite. The hybrid material AC-TiO2 composite displayed a higher photocatalytic activity against Reactive Red 120 and ofloxacin. The stability of the AC-TiO2 was tested against RR 120 dye degradation with multiple runs. GC-MS analyzed the degradation intermediates, and a suitable degradation pathway was also proposed. These results demonstrate that AC-TiO2 composite could be effectively used as an ecofriendly, cost-effective, stable, and highly efficient photocatalyst.

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Section: Resultsmentioning

confidence: 99%

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

et al. 2022

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“…C-CD and C-CD/TiO 2 were equally oriented and possessed similar particle sizes (approximately 240 and 255 nm, respectively). The change in surface roughness between C-CD and C-CD/TiO 2 can be attributed to the existence of TiO 2 on the surface of C-CD. ,, The elemental composition was further investigated using EDX spectroscopy, showing the percentages of carbon, oxygen, and titanium in C-CD and C-CD/TiO 2 . The EDX results were consistent with the SEM images and the elemental mapping which showed the C, O, and Ti contents in C-CD and C-CD/TiO 2 (Figure c1,c2, respectively).…”

Section: Resultsmentioning

confidence: 99%

“…The potential application of CD for cell bioimaging is as an intracellular and membrane marker. However, without any further functionalization CDs could not selectively target the cellular membrane or subcellular components, although CDs can still mark the membranes or cytoplasm. , The cell membrane consists of phospholipid layers which allow hydrophobic compounds to penetrate into the hydrophobic sites of cell membranes. , Previous studies showed that the addition of CDs to the surface of TiO 2 nanoparticles can enhance photocatalytic activity via a reduced energy bandgap under UV–visible-light irradiation. − Furthermore, the use of zwitterionic-formed nanoparticles, which possess hydrophobic–hydrophilic transitions when triggered by pH, can cause specific uptake in cells and subsequent translocation to the nucleus for improved target imaging at the site. , The combination of TiO 2 and CDs (photocatalytic and tunable optical property) inspired the design of a pH-responsive CD that targets the membrane and nucleus of cancer cells based on the fluorescence on–off phenomenon. This platform also can produce controlled photothermal heat under near-infrared-visible-light (NIR-Vis) exposure.…”

Section: Introductionmentioning

confidence: 99%

NIR-vis-Induced pH-Sensitive TiO₂ Immobilized Carbon Dot for Controllable Membrane-Nuclei Targeting and Photothermal Therapy of Cancer Cells

Phuong

Won

Robby

et al. 2020

ACS Appl. Mater. Interfaces

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This study investigated a selective and sensitive theragnosis system for the specific targeting of the membrane and nuclei based on visible-light and pH-responsive TiO2-integrated cross-linked carbon dot (C-CD/TiO2) for tumor detection and controllable photothermal therapy. The cross-linking system was formed by boronate ester linkages between the TiO2-immobilized Dopa-decyl (D-CD) and zwitterionic-formed CD (Z-CD) for nuclear targeting, which showed fluorescence “off” at physiological pH. The fluorescence recovered to the “on” state in acidic cancer cells owing to cleavages of the boronate ester bonds, resulting in the disruption of the Förster resonance energy transfer that generated different CDs useful for tumor-selective biosensors and therapy. D-CD, which is hydrophobic, can penetrate the hydrophobic sites of the cell membrane; it caused a loss in the hydrophobicity of these sites after visible-light irradiation. This was achieved by the photocatalytic activity of the TiO2 modulating energy bandgap, whereas the Z-CD targeted the nucleus, as confirmed by merged confocal microscopy images. D-CD augmented by photothermal heat also exhibited selective anticancer activity in the acidic tumor condition but showed only minimal effects at a normal site at pH 7.4. After C-CD/TiO2 injection to an in vivo tumor model, C-CD/TiO2 efficiently ablated tumors under NIR light irradiation. The C-CD/TiO2 group showed up-regulation of the pro-apoptotic markers such as P53 and BAX in tumor. This material exhibited its potential as a theragnostic sensor with excellent biocompatibility, high sensitivity, selective imaging, and direct anticancer activity via photothermal therapy.

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“…8). 188 The MB degradation by CNT/C-dots/FA/TiO 2 , Alg/ CNT/C-dots/FA/TiO 2 , pure TiO 2 and pure FA after 27 min was around 100%, 21%, 59%, and 10%, respectively. Indeed, adding Alg to the CNT/C-dots/FA/TiO 2 has increased the bandgap, reduced the photocatalytic activity, and lowered the MB degradation percentage.…”

Section: Application Of C-dots/ Polysaccharidesmentioning

confidence: 91%

Polysaccharide-based C-dots and polysaccharide/C-dot nanocomposites: fabrication strategies and applications

et al. 2023

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Synthesis of alginate/carbon nanotube/carbon dot/fluoroapatite/TiO2 beads for dye photocatalytic degradation under ultraviolet light

Cited by 49 publications

References 33 publications

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

NIR-vis-Induced pH-Sensitive TiO₂ Immobilized Carbon Dot for Controllable Membrane-Nuclei Targeting and Photothermal Therapy of Cancer Cells

Polysaccharide-based C-dots and polysaccharide/C-dot nanocomposites: fabrication strategies and applications

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Synthesis of alginate/carbon nanotube/carbon dot/fluoroapatite/TiO2 beads for dye photocatalytic degradation under ultraviolet light

Cited by 49 publications

References 33 publications

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

Design and Preparation of Biomass-Derived Activated Carbon Loaded TiO2 Photocatalyst for Photocatalytic Degradation of Reactive Red 120 and Ofloxacin

NIR-vis-Induced pH-Sensitive TiO2 Immobilized Carbon Dot for Controllable Membrane-Nuclei Targeting and Photothermal Therapy of Cancer Cells

Polysaccharide-based C-dots and polysaccharide/C-dot nanocomposites: fabrication strategies and applications

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NIR-vis-Induced pH-Sensitive TiO₂ Immobilized Carbon Dot for Controllable Membrane-Nuclei Targeting and Photothermal Therapy of Cancer Cells