Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin

Rashid, Jamshaid; Abbas, Ammara; Chang, Leng Chee; Iqbal, Abdullah; Haq, İhsan Ul; Rehman, Adeela; Awan, Saif Ullah; Arshad, Muhammad; Rafique, Mohsin; Barakat, M.A.

doi:10.1016/j.scitotenv.2019.02.145

Cited by 115 publications

(23 citation statements)

References 51 publications

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“…The preparation methods of titanium-based photocatalytic materials can be mainly divided into physical methods, chemical methods and comprehensive methods. The comprehensive methods include hydrothermal synthesis, water-in-oil microemulsion, TiCl 4 gas phase process and titanium alkoxide hydrolysis [20][21][22][23][24]. However, these methods usually have a complicated process or need an expensive apparatus [25].…”

Section: Introductionmentioning

confidence: 99%

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

et al. 2019

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Further applications of photocatalysis were limited by the high recombination probability of photo-induced electron–hole pairs in traditional titanium dioxide nanoparticles (TiO2 NPs). Herein, we modified them with rare earth metal via a facile sol–gel method, using tetrabutyl titanate as a precursor and terbium (III) nitrate hexahydrate as terbium (Tb) source. The resulting samples with different Tb doping amounts (from 0 to 2%) have been characterized by X-ray diffraction, UV–visible diffuse reflectance spectroscopy, X-ray photo-electron spectroscopy and a scanning electron microscope. The photocatalytic performance of Tb-doped TiO2 was evaluated by the degradation of methylene blue. The effects of Tb doping amount and initial pH value of solution were investigated in detail. The composite with Tb doping amount of 1.0 wt% showed the highest photocatalytic performance. It exhibited approximately three times enhancement in photocatalytic activity with a reaction rate constant of 0.2314 h−1 when compared with that of commercial P25 (0.0827 h−1). In addition, it presented low toxicity on zebrafishes with 96 h-LC50 of 23.2 mg l−1, and has been proved to be reusable for at least four cycles without significant loss of photocatalytic activity. A probable photocatalytic mechanism of Tb-doped TiO2 was proposed according to the active species trapping experiments. The high photocatalytic performance, excellent reusability and low toxicity of Tb-doped TiO2 indicated that it is a promising candidate material in the future treatment of dye wastewater.

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Section: Introductionmentioning

confidence: 99%

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

et al. 2019

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“…However, when BQ and EDTA-2Na were added, there was an obvious reduction in degradation efficiency as a result of the suppression of h + and O 2 •− which were the major species in the reaction system. Rashid et al, 36 made similar conclusions for the photocatalytic mineralization of aqueous ciprofloxacin.…”

Section: Resultsmentioning

confidence: 70%

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene dye

et al. 2021

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Background: The removal of textile wastes is a priority due to their mutagenic and carcinogenic properties. In this study, bismuth oxyhalide was used in the removal of methylene blue (MB) which is a textile waste. The main objective of this study was to develop and investigate the applicability of a bismuth oxyhalide (BiOBrzI(1-z)) solid solutions in the photodegradation of MB under solar and ultraviolet (UV) light irradiation. Methods: Bismuth oxyhalide (BiOBrzI(1-z)) (0 ≤ z ≤ 1) materials were successfully prepared through the hydrothermal method. Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), X-ray diffractometer (XRD), and scanning electron microscope (SEM) were used to determine the surface area, microstructure, crystal structure, and morphology of the resultant products. The photocatalytic performance of BiOBrzI(1-z) materials was examined through methylene blue (MB) degradation under UV light and solar irradiation. Results: The XRD showed that BiOBrzI(1-z) materials crystallized into a tetragonal crystal structure with (102) peak slightly shifting to lower diffraction angle with an increase in the amount of iodide (I-). BiOBr0.6I0.4 materials showed a point of zero charge of 5.29 and presented the highest photocatalytic activity in the removal of MB with 99% and 88% efficiency under solar and UV irradiation, respectively. The kinetics studies of MB removal by BiOBrzI(1-z) materials showed that the degradation process followed nonlinear pseudo-first-order model indicating that the removal of MB depends on the population of the adsorption sites. Trapping experiments confirmed that photogenerated holes (h+) and superoxide radicals (•O2−) are the key species responsible for the degradation of MB. Conclusions: This study shows that bismuth oxyhalide materials are very active in the degradation of methylene blue dye using sunlight and thus they have great potential in safeguarding public health and the environment from the dye’s degradation standpoint. Moreover, the experimental results agree with nonlinear fitting.

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“…PL spectral analysis determined the band gap of 2.81 eV and wavelength was observed from 480 to 570 nm for 15% BiOBr/TiO 2 and it gave the degradation of aqueous ciprofloxacin (target pollutant) under visible light at λ > 420 nm about 92.5% and under direct sunlight it gave 100% degradation utilizing reaction time of 2.5 h. Radical scavenging study indicated that besides superoxide radicals and holes the OH • had dominant effect on net photodegradation process. Results also suggested that the catalyst was 9.4 and 5.2 times active in degradation than pristine BiOBr and TiO 2 , reusability experiments determined the high stability of catalyst as it suffered loss of only 12% even after 5 cycles of fresh CIP degradation [146].…”

Section: Retained Catalytic Stability Even After 3 Cycles Of Use Withmentioning

confidence: 92%

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Imtiaz¹,

Rashid²,

Xu³

2019

Concepts of Semiconductor Photocatalysis

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Semiconductor photocatalysis gained reputation in the early 1970s when Fujishima and Honda revealed the potential of TiO 2 to split water in to hydrogen and oxygen in a photoelectrochemical cell. Their work provided the base for the development of semiconductor photocatalysis for the environmental remediation and energy applications. Photoactivity of some semiconductors was found to be low due to larger band gap energy and higher electron-hole pair recombination rate. To avoid these problems, the development of visible light responsive photocatalytic materials by different approaches, such as metal and/or non-metal doping, codoping, coupling of semiconductors, composites and heterojunctions materials synthesis has been widely investigated and explored in systematic manner. This chapter emphasizes on the different type of tailored photocatalyst materials having the enhanced visible light absorption properties, lower band gap energy and recombination rate of electron-hole pairs and production of reactive radical species. Visible light active semiconductors for the environmental remediation purposes, particularly for water treatment and disinfection are also discussed in detail. Studies on the photocatalytic degradation of emerging organic compounds like cyanotoxins, VOCs, phenols, pharmaceuticals, etc., by employing variety of modified semiconductors, are summarized, and a mechanistic aspects of the photocatalysis has been discussed.

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Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin

Cited by 115 publications

References 51 publications

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene dye

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

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