Hydrothermal synthesis of BiOBr/FeWO4 composite photocatalysts and their photocatalytic degradation of doxycycline

Gao, Jiacong; Gao, Yu; Sui, Zhenying; Dong, Zijun; Wang, Siyu; Zou, Donglei

doi:10.1016/j.jallcom.2017.10.092

Cited by 95 publications

(22 citation statements)

References 43 publications

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“…The construction of BiOBr–CoWO 4 heterostructures by merging the narrow bandgap of CoWO 4 nanoparticles with the wide bandgap of BiOBr is a promising approach for utilizing visible light and encouraging photoinduced electron–hole pair separation, which can result in enhanced photoactivity. In order to enhance the activity of BiOBr, a variety of metal tungstate nanoparticles have been used to couple with BiOBr to form heterostructures, namely BiOBr nanodots–Bi 2 WO 6 , BiOBr–FeWO 4 , CdWO 4 –BiOBr, BiOBr–ZnWO 4 , etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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Efficient sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposite photocatalysts were prepared via a chemical precipitation route at 100°C in 4 hours. The prepared BiOBr–CoWO4 heterostructures were characterized for phase identification, chemical composition, surface morphology, optical properties and surface area using various techniques. The X‐ray diffraction pattern of the BiOBr–CoWO4 nanocomposite was composed of diffraction peaks equivalent to both the tetragonal phase of BiOBr and the monoclinic phase of CoWO4 nanoparticles. X‐ray photoelectron spectral study of the BiOBr–CoWO4 nanocomposite revealed orbitals of both BiOBr and CoWO4 compounds. Transmission electron microscopy images revealed that spherical particles of CoWO4 (20–25 nm) were dispersed on the surface of BiOBr. UV–visible–near‐infrared spectral study of the BiOBr–CoWO4 nanocomposite showed good visible‐light absorption. Among the manufactured materials, BiOBr–CoWO4‐2 nanocomposite showed better charge carrier separation efficiency, as demonstrated by photoluminescence and time‐resolved fluorescence. To study the practical utility of the prepared materials, their photocatalytic capability was examined for the degradation of rhodamine B (RhB) aqueous solution under sunlight irradiation. The photodegradation results showed that BiOBr–CoWO4‐2 nanocomposite degraded 98.69% RhB solution and the degradation constant was 0.067 min−1, which was 5.6 and 22.5 times larger than that of pure BiOBr and CoWO4 nanoparticles, respectively, after 60 minutes of sunlight irradiation. The superior photoactivity was facilitated by electron–hole pair separation and transfer driven by the heterostructure interface between BiOBr particles and CoWO4 nanoparticles. The removal of RhB was initiated by photogenerated h+, O2•−and •OH reactive species based on the scavenger effect.

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Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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“…Due to the presence and the risks of DOX in some water bodies, it is important to remove DOX from water. The existing methods mainly include electrocoagulation, adsorption, biodegradation, fenton, and photodegradation technique …”

Section: Introductionmentioning

confidence: 99%

“…8 It can accelerate the spread of resistant bacteria, reduce human immunity, and pose a threat to the environment. [9][10][11][12] Spongberg et al analyzed 34 PPCPs in 86 individual water samples that were collected from surface water and coastal locations in Costa Rica. DOX was most frequently detected.…”

Section: Introductionmentioning

confidence: 99%

“…The existing methods mainly include electrocoagulation, 15 adsorption, [16][17][18] biodegradation, 19 fenton, 20 and photodegradation technique. 10 Photodegradation technique is an effective, economical, and environmentally friendly technique. 21 Since visible light accounts for 52% of sunlight, photodegradation technique by visible light has been studied widely for degradation of various pollutants.…”

Section: Introductionmentioning

confidence: 99%

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Effective degradation of doxycycline by photocatalytic BiVO₄–H₂O₂ under visible light

Tong

Kang

Shen

et al. 2019

Env Prog and Sustain Energy

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Doxycycline (DOX) is a type of antibiotic that exists in the environment and is desired to be effectively removed. Herein, DOX was degraded by photocatalytic BiVO4–H2O2 and photocatalytic BiVO4 systems in this paper. Under the same degradation conditions, the effects of the two systems on DOX degradation were compared. The effect of the solution pH on degradation of DOX was examined in the range of 3.5–11.5. The optimum pH values were 7.5 and 11.5 for light‐BiVO4–H2O2 and light‐BiVO4 systems, respectively, and their removal rates were 96.27 and 98.84%, respectively. The optimum temperature of degradation was both 40°C by two methods, and the removal rates were 97.03 and 53.43%, respectively. The optimum dosage of BiVO4 was both 70 mg by two methods, and the removal rates were 95.92 and 52.52%, respectively. The degradation effect by light‐BiVO4–H2O2 method was better than that by light‐BiVO4 method. The possible photocatalytic reaction mechanism was also discussed briefly based on ESR spectrum. DMPO trapping experiment was applied to reveal the production of hydroxyl radicals. These works provide promising constructs at dealing with the DOX water by photocatalytic degradation.

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“…This in addition to the recombination of photoinduced electron-hole pairs, makes the visible light activity of BiOBr limited. Fortunately, the performance of BiOBr could be improved by forming heterojunctions in the form of BiOBr/FeWO 4 [16], BiOBr/Bi 2 O 2 CO3 [17], BiOBr/NaBiO 3 [18] and BiOBr/BiPO 4 [19]. Such heterojunction might result in enhanced visible light absorption and/or prevent charge carriers' recombination.…”

Section: Introductionmentioning

confidence: 99%

Room-temperature in situ synthesis of BiOBr/Bi2O3 composites for the catalytic degradation of ciprofloxacin using indoor fluorescent light illumination

2019

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In this study, a complete room-temperature process for the synthesis of BiOBr/Bi 2 O 3 composites has been developed. The process is facile, rapid and gives high yield. Initially, BiOBr photocatalyst was synthesized via solid-state synthesis using polyethylene glycol 400 (PEG400) as a morphology control agent. Subsequently, an in situ method in aqueous NaOH solution was adopted for the conversion of pristine BiOBr to BiOBr/Bi 2 O 3 composites with variable proportion of α-Bi 2 O 3 , at room-temperature. Alkali etching duration played a key role towards crystalline, surface, morphological and optical properties of BiOBr/Bi 2 O 3 composites, as confirmed by XRD, SEM, XPS, FTIR, UV-DRS, BET and PL characterizations. Compared to pristine BiOBr, the BiOBr/Bi 2 O 3 composites exhibited high activity for ciprofloxacin (CIP) degradation under indoor fluorescent light illumination. Their photocatalytic activity increases with the increase in etching duration up to a period of 60 min and then decreases. The degradation efficiency of aqueous CIP solution (100 mL, 20 ppm) reached 95.3% within 90 min in the presence of BiOBr/Bi 2 O 3-60 which showed the best performance, and the composite remained stable even after five consecutive cycles. Meanwhile, photogenerated holes (h +) and superoxide radical anions (⋅ O − 2) were found to be the dominant degrading species during active species studies, and a possible mechanism for the photocatalytic degradation of CIP over BiOBr/Bi 2 O 3-60 composite photocatalyst has been proposed.

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Hydrothermal synthesis of BiOBr/FeWO4 composite photocatalysts and their photocatalytic degradation of doxycycline

Cited by 95 publications

References 43 publications

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Effective degradation of doxycycline by photocatalytic BiVO₄–H₂O₂ under visible light

Room-temperature in situ synthesis of BiOBr/Bi2O3 composites for the catalytic degradation of ciprofloxacin using indoor fluorescent light illumination

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Hydrothermal synthesis of BiOBr/FeWO4 composite photocatalysts and their photocatalytic degradation of doxycycline

Cited by 95 publications

References 43 publications

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Effective degradation of doxycycline by photocatalytic BiVO4–H2O2 under visible light

Room-temperature in situ synthesis of BiOBr/Bi2O3 composites for the catalytic degradation of ciprofloxacin using indoor fluorescent light illumination

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Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Effective degradation of doxycycline by photocatalytic BiVO₄–H₂O₂ under visible light