Synergistic interaction of Z-scheme 2D/3D g-C3N4/BiOI heterojunction and porous PVDF membrane for greatly improving the photodegradation efficiency of tetracycline
“…As a result, it has great prospective in membrane filtration applications, particularly for visible-light-driven photocatalytic activity [ 25 ]. Instigated by the aforementioned benefits, g-C 3 N 4 based advanced membranes can demonstrate greater efficiency than usual membranes in terms of separation and self-cleaning [ 26 ]. Thus, the newly produced g-C 3 N 4 based hybrid membranes can accomplish the desired removal efficiency for a wide range of pollutants as well as outstanding membrane fouling resistance.…”
Section: Introductionmentioning
confidence: 99%
“…During the formation of the layers, nitrogen and carbon atoms alternated in a hexagonal pattern. The potential total surface area of g-C 3 N 4 may go as high as 2500 m 2 g −1 [ 26 , 29 ]. Fig.…”
“…As a result, it has great prospective in membrane filtration applications, particularly for visible-light-driven photocatalytic activity [ 25 ]. Instigated by the aforementioned benefits, g-C 3 N 4 based advanced membranes can demonstrate greater efficiency than usual membranes in terms of separation and self-cleaning [ 26 ]. Thus, the newly produced g-C 3 N 4 based hybrid membranes can accomplish the desired removal efficiency for a wide range of pollutants as well as outstanding membrane fouling resistance.…”
Section: Introductionmentioning
confidence: 99%
“…During the formation of the layers, nitrogen and carbon atoms alternated in a hexagonal pattern. The potential total surface area of g-C 3 N 4 may go as high as 2500 m 2 g −1 [ 26 , 29 ]. Fig.…”
“…[28] To further investigate the chemical states and electronic structures of the composite films, X-ray photoelectron spectroscopy (XPS) measurements were conducted. For PCN/PVDF-HFP film, [29] the C 1s spectra shows four peaks at 284.5, 285.8, 287.3 and 290.6 eV, which correspond to sp2 CÀ C, HÀ CÀ H, NÀ C=N and FÀ CÀ F, respectively (Figure 2a). It again demonstrates the coexistence of CN ring and PVDF.…”
Piezocatalysis is considered as an emerging alternative to the traditional anthraquinone oxidation process to produce hydrogen peroxide by directly converting mechanical energy into chemical energy. However, the development of low‐cost, recyclable piezocatalysts with excellent piezoelectric performance is highly desired but also challenging. Herein, phosphorous‐doped graphite phase carbon nitride (PCN) as a filler was added to polytetrafluoroethylene‐hexafluoropropylene (PVDF‐HFP), and this nonmetal composite film with porous structure and rich β phase shows enhanced piezoelectricity. The synergy effects of the matrix and filler in mutual promoting their catalytic‐relevant properties (piezoelectrical capacities and carrier densities) ensure high H2O2 production up to 668.56 μmol ⋅ gcat−1 ⋅ h−1. The randomly fluctuating electrical fields disturb the strong adsorption of the *OOH intermediate and promote its desorption and subsequently the production of H2O2. The composite film can be used multiple times and easily recycled. This work provides novel insights in the piezocatalytic processes and inspire the development of excellent piezocatalysts for practical peroxide production at the consuming locations.
“…The rational design of g-C 3 N 4 -based heterojunction has been currently considered as one of the most effective strategies to solve the above shortcomings. − This method has gained extensive attraction in the photodegradation antibiotic field because of the enlargement of sunlight absorption range and the promotion of photoinduced charge carrier migration . Among them, the Z-scheme heterojunction photocatalysts stand out for their excellent sensitivity to visible-light induction and are highly reactive to photogenerated charge carriers. − Hence, the reliable Z-scheme heterojunction photocatalyst is exactly what we seek, which has good development potential. Successful cases have been demonstrated in previous research, such as BiOI/ECN, Bi 2 O 3 /g-C 3 N 4 , Bi 2 WO 6 /g-C 3 N 4 , MoO 3 /Ag/C 3 N 4 , MnO 2 /GO/g-C 3 N 4 , Sn 3 O 4 /g-C 3 N 4 , and so on.…”
Antibiotic residues entering the
ecological environment not only
cause serious environmental pollution but also may cause the development
of resistance genes and other ecological risks. Therefore, the degradation
of antibiotic contaminants has become a research hot spot. Herein,
a new Z-scheme BiVO4/exfoliated g-C3N4 heterojunction photocatalyst was synthesized for efficient tetracycline
photodegradation with the assistance of peroxymonosulfate under visible
light irradiation. The influence of different key environmental factors,
including peroxymonosulfate concentrations, coexisting ions, and solution
pH, on the photodegradation efficiency of tetracycline was comprehensively
studied. The optimized BiVO4/exfoliated g-C3N4–0.6 was demonstrated to exhibit excellent photodegradation
performance of tetracycline with an apparent kinetic constant of ca.
0.128 min–1 with 0.3 mM peroxymonosulfate, which
was ca. 3 times of exfoliated g-C3N4 (0.0415
min–1) under the same conditions and about 16 times
and 5 times of bulk g-C3N4 (0.0080 min–1) and exfoliated g-C3N4 (0.0285 min–1) without peroxymonosulfate, respectively. The BiVO4/exfoliated
g-C3N4–0.6 showed only about 5% reduction
in the degradation efficiency of tetracycline after six consecutive
cycle experiments. The free radical scavenging test and electron spin
resonance characterization results suggested that •O2
–, h+, •SO4
–, •OH, and 1O2 were all involved in
the catalytic oxidative process of tetracycline in the BiVO4/exfoliated g-C3N4–0.6, peroxymonosulfate
and light reaction system. This study not only offers an attractive
Z-scheme heterojunction photocatalyst for tetracycline degradation
but also demonstrates a promising way to use peroxymonosulfate for
advanced wastewater treatment.
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