Environmental Science-Nano
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2021
·Vol. 8
·期 3
·773-783
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IF 8.131
Haixia Wang,Dong Liang,Yan Xu,Xiang Liang,Xiaoqing Qiu,Zhang Lin
The development of an effective and stable photochemical sensor is urgently needed to solve the growing environmental pollution problem caused by immoderate usage of the organic phosphorus pesticide, chlorpyrifos. Under the circumstances, 2D/2D Z-scheme β-Bi2O3/g-C3N4 heterojunctions have been attempted to fabricate a photoelectrochemical sensor, which can detect chlorpyrifos selectively and sensitively. The 2D/2D intimate contact interfaces could facilitate the separation and migration of electron–hole pairs. Consequently, β-Bi2O3/g-C3N4 composites possess higher photocurrent response than single β-Bi2O3 and g-C3N4. After incubation with chlorpyrifos, in situ formed Bi–chlorpyrifos complex blocks the transformation of photogenerated charges, and thus contributes to a dramatic decline in photocurrent signal intensity and selective determination of chlorpyrifos. The novel photoelectrochemical sensor with strong stability presents a perfect linear relationship between photocurrent intensity and logarithm of chlorpyrifos concentration ranging from 0.01 to 80 ng mL−1, and displays excellent properties over a wide linear range with an ideal detection limit of 0.03 ng mL−1 (S/N = 3). To some extent, the Z-scheme β-Bi2O3/g-C3N4 sensor is promising for the detection of chlorpyrifos pesticides in practical environmental pollution treatment applications.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2014
·
IF 4.331
Jinfeng Zhang,Yingfei Hu,Xiaoliang Jiang,Shifu Chen,Sugang Meng,Xianliang Fu
A direct Z-scheme photocatalyst Bi 2 O 3 /g-C 3 N 4 was prepared by ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface areas, photoluminescence technique (PL), and electron spin resonance (ESR) technology. The photocatalytic activity was evaluated by degradation of methylene blue (MB) and rhodamine B (RhB). The results showed that Bi 2 O 3 /g-C 3 N 4 exhibited a much higher photocatalytic activity than pure g-C 3 N 4 under visible light illumination. The rate constants of MB and RhB degradation for Bi 2 O 3 (1.0 wt.%)/g-C 3 N 4 are about 3.4 and 5 times that of pure g-C 3 N 4 , respectively. The migration of photogenerated carriers adopts a Z-scheme mechanism. The photoexcited electrons in the CB of Bi 2 O 3 and photogenerated holes in the VB of g-C 3 N 4 are quickly combined, so the photoexcited electrons in the CB of g-C 3 N 4 and holes in the VB of Bi 2 O 3 participate in reduction and oxidation reactions, respectively. O 2 − , OH and h + are the major reactive species for the Bi 2 O 3 /g-C 3 N 4 photocatalytic system.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 32
·14522-14531
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IF 3.591
Liruhua Zhang,Qianhong Shen,SuHua Zheng,LiXin Yu,Feilong Huang,Changteng Zhang,Jiansong Sheng,Hui Yang
A novel Z-scheme mixed-crystal Bi2O3/g-C3N4 composite photocatalyst was successfully prepared by a simple electrospinning–calcination approach. The micromorphology, configuration, chemical interaction and optical properties of the synthesized composite photocatalyst were analyzed and the photocatalytic degradation efficiency was estimated by the photodegradation of antibiotics. The results show that Bi2O3 nanofibers existing as α and β mixed-crystal phases are prepared and mixed with g-C3N4 nanosheets, thus forming a highly efficient α-Bi2O3/β-Bi2O3/g-C3N4 homoheterojunction. Transfer of the photogenerated electrons and holes in the fabricated α-Bi2O3/β-Bi2O3/g-C3N4 homoheterojunction follows a Z-scheme enhanced photocatalytic mechanism, resulting in the effective separation and transfer of photogenerated e− and h+. Moreover, the mixed-crystal Bi2O3/g-C3N4 photocatalyst has an enhanced visible-light absorbance. Therefore, the Bi2O3/g-C3N4 composite displays high photocatalytic properties for degrading tetracycline hydrochloride under 5 W LED visible-light irradiation, and the high photocatalytic activity is maintained even after 5 cycles, indicating the outstanding stability and reusability of the composite photocatalyst.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Zuo Guangling,Ye Hongyong,Du Jia,Ding Xin
A ternary Ag/Bi 2 O 3 /g-C 3 N 4 (Ag/BO/CN) photocatalyst was fabricated through a combined solvothermal and photochemical reduction approach for the degradation of ciprofloxacin hydrochloride (CIP). Upon illumination with simulated sunlight, the optimized Ag/BO/CN composite efficiently degraded CIP, resulting in near-complete (98.14%) removal within 100 min. This remarkable property is attributed to a synergetic interaction between the Ag surface plasmon resonance (SPR) effect and the S-scheme heterojunction (between BO and CN). In-situ XPS analysis and work function ( Φ ) calculations confirmed the S-scheme charge migration pathway. In this scheme, an internal electric field (IEF) prompts the reunification of less-reactive charge carriers, thereby selectively retaining the highly reductive electrons (e − ) in the conduction band (CB) of CN and the strongly oxidative holes (h + ) in the valence band (VB) of BO. Quenching experiments and electron spin resonance (ESR) spectroscopy identified superoxide radicals (·O 2 − ) and hydroxyl radicals (·OH) as the primary reactive intermediates. Moreover, the catalyst shows considerable promise for practical deployment, as evidenced by its excellent stability over four consecutive cycles and sustained degradation performance across various real water systems. Graphical abstract The alternative text for this image may have been generated using AI.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuqi Cui,Li-chao Nengzi,Jianfeng Gou,Yan Huang,Bo Li,Xiuwen Cheng
Z-scheme heterojunction photocatalyst can simultaneously reduce the recombination of photo-generated electron-hole pairs and preserve its outstanding redox ability during the process of photocatalytic reaction. In this study, Z-scheme MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 photocatalyst was successfully fabricated via an accessible method and comprehensive characterized by XRD, FT-IR, SEM, TEM, XPS, N 2 adsorption-desorption isotherms, UV–vis diffuse reflection spectroscopy and photoelectrochemical analysis. The as-obtained MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 composite exhibited superior photocatalytic activity for amino black 10B degradation than that of pure g-C 3 N 4 , α-Bi 2 O 3 , MIL-53(Fe) and α-Bi 2 O 3 /g-C 3 N 4 binary composite under visible light irradiation and the photodegradation rate would achieve the maximum when the mass fraction of MIL-53(Fe) was 32% in ternary composite. The enhanced photocatalytic performance of MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 ternary composite could be mainly ascribed to improved visible light absorption range and the construction of an effective interfacial heterojunction driven by direct solid-state dual Z-scheme mechanism, which significantly facilitates the separation and transfer of photo-generated charge carriers. Eventually, the as-prepared ternary composite was confirmed to have prominent stability and reusability after consecutive 4 recycling run.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liping Zhang,Guohong Wang,Zhenzhong Xiong,Hua Tang,Chuanjia Jiang
A combined hydrothermal-calcination approach is developed to synthesize hierarchical β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalyst with enhanced visible light photoactivity for Rhodamine B (RhB) degradation. First, Bi 2 O 2 CO 3 microflowers were hydrothermally prepared using Bi(NO 3 ) 3 ·5H 2 O as feedstocks, and then a series of β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalysts were synthesized via a facile calcination method using Bi 2 O 2 CO 3 and g-C 3 N 4 as precursors. The samples were systematically characterized by various characterization technologies including X-ray diffraction, scanning and transmission electron microscopes, Fourier transform infrared spectroscopy and N 2 absorption-desorption equipment. It was found that the g-C 3 N 4 content in the precursors played a key role in affecting the photocatalytic activity of the final products. The β -Bi 2 O 3 /g-C 3 N 4 heterojunction exhibited higher photocatalytic activity than single active components ( β -Bi 2 O 3 and g-C 3 N 4 ), indicating the presence of a synergistic effect between two active components in β -Bi 2 O 3 /g-C 3 N 4 heterojunction. Among all as-prepared catalysts, the 70 wt.% g-C 3 N 4 /Bi 2 O 2 CO 3 exhibits the highest activity for RhB degradation, and the apparent reaction rate constant k (42.2 × 10 −3 min −1 ) is 3.1 and 1.7 times as high as that of pure β -Bi 2 O 3 (13.5 × 10 −3 min −1 ) and g-C 3 N 4 (25.2 × 10 −3 min −1 ), respectively. The enhanced photocatalytic performance of β -Bi 2 O 3 /g-C 3 N 4 heterostructure photocatalysts is mainly due to the high surface area, closely contacted interfaces between the β -Bi 2 O 3 and g-C 3 N 4 component, and the formation of direct Z-scheme structure in the β -Bi 2 O 3 /g-C 3 N 4 composites.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
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