APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Jian Chen,Siyuan Wang,Shuyun Wang,Rong Tang,Huan Chen
As a persistent contaminant with significant risks to environment, health and ecology, perfluorooctanoic acid (PFOA) is urgent to be treated from water. To improve the performance of commercial Ga 2 O 3 in the photocatalytic degradation of PFOA, a Bi 4 O 7 -Ga 2 O 3 composite was facilely obtained through a hydrothermal route, and characterized with diverse techniques. Batch tests were conducted to evaluate the impacts from the experimental conditions on PFOA degradation, where the Bi 4 O 7 -Ga 2 O 3 composite (GaBi10) exhibited optimized photocatalytic performance stems from the enhanced light response, improved separation of photo-generated carriers, and increased adsorption capacity, attributed by Bi 4 O 7 incorporation. Furthermore, a universal parameter, catalytic efficiency ( η ) is proposed for the quantitative comparison of photocatalytic performance across different studies, which demonstrate the outstanding performance of GaBi10 in PFOA degradation, defluorination and mineralization. The quenching tests and intermediates analysis were executed to explore the mechanism underlying the photocatalytic degradation, which indicated the degradation is initiated by h + , and other active species, ·O 2 – and ·OH, propel the mineralization of the intermediates derived from PFOA. The findings provide valuable insights for developing commercial photocatalyst and understanding photocatalytic degradation of PFOA.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 52
·79184-79198
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IF 5.19
Zhao Yajuan,Dang Pu,Gao Yaqian,Li Yan,Xie Huidong,Yang Chang
Co 3 O 4 /Bi 4 O 7 /Bi 2 O 3 (CBB) composites were prepared, in which Co 3 O 4 was synthesized from Co-MOF as precursor. The peroxymonosulfate (PMS) activated by CBB catalyst under visible light was used to degrade tetracycline (TC). Owing to the synergistic effect of photocatalysis and PMS activation, 98.4% of TC was removed within 60 min. The optimal loading of Co 3 O 4 was determined, and the influence of PMS dosage, initial pH, and disturbing anions on the degradation effect were investigated. The “CBB + Vis + PMS” system showed good reusability, and the degradation was only reduced by 1.7% after 5 cycles. This system also had a good degradation of other five pollutants. The quenching experiment showed that holes (h + ), superoxide radicals (·O 2 − ), and singlet oxygen ( 1 O 2 ) were the main active species. The degradation products of TC were determined by liquid chromatography-mass spectrometry, and the degradation pathway was proposed. Finally, a double Z-scheme degradation mechanism was proposed in the “CBB + Vis + PMS” system. The peroxymonosulfate activated by CBB under visible light to degrade organic pollutants has widespread application prospects in environmental remediation. Graphical abstract
研究领域:
环境科学
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催化化学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Shuyun Wang,Siyuan Wang,Rong Tang,Yin Liu,Huan Chen
Perfluorooctanoic acid (PFOA) and 2,4,6-trichlorophenol (2,4,6-TCP) are significant pollutants found in textile wastewater, posing severe threats to ecological environments. The construction of an adsorption-photocatalytic system enables the efficient removal of mixed pollutants by harnessing their synergistic effect, thereby overcoming the limitations of removing mixed pollutants with single water treatment technologies. Herein, fluorine-doped covalent triazine framework (F-CTF) was combined with Ga 2 O 3 -Bi 4 O 7 heterojunction to obtain Ga 2 O 3 -Bi 4 O 7 /F-CTF (GaBi/CTF). F-CTF greatly facilitates the adsorption process and provides convenience for photocatalysis. Simultaneously, the excellent conductivity of F-CTF promoted the separation of photoinduced charge carriers in Ga 2 O 3 -Bi 4 O 7 . GaBi/CTF5 (5 is the mass percentage of F-CTF) showed excellent degradation performance, and the removal rates of PFOA and 2,4,6-TCP reached 93.0 % and 100.0 % within 90 min, respectively. Mechanistic analysis revealed that 2,4,6-TCP and PFOA were attacked by distinct active species because of the disparate characteristics. The presence of phenolic hydroxyl groups makes 2,4,6-TCP more vulnerable to superoxide radicals (·O 2 – ) and hydroxyl radicals (·OH), whereas PFOA is oxidized by holes (h + ). The coexistence of mixed pollutants with diverse characteristics enables optimal utilization of active species generated within photocatalytic system. Moreover, the good stability of GaBi/CTF5 provides a feasible solution for efficient treatment of mixed pollutants in textile wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wei Zhao,Mengru Yan,Yantong Chen,Junyu Shen,Xuekun Hong,Feihu Mu,Shijie Li,Sujuan Zhang,Quan Wang,Benlin Dai,Yazi Liu,Cheng Sun
Public health and ecosystems are at risk due to the overuse and large discharge of pharmaceutical and personal care products (PPCPs) (e.g. carbamazepine). Herein, a MIL-68(In)-NH 2 /Bi 4 O 7 S-scheme heterojunction was first prepared through a two-step route for efficient and environmentally friendly photocatalytic carbamazepine degradation. 1.0-MIL-68(In)-NH 2 /Bi 4 O 7 displayed efficient photocatalytic performance, and the removal rate of 50 mg/L carbamazepine could reach 92.7% at 120 min, which was 3.6 and 2.9 times that of Bi 4 O 7 and MIL-68(In)-NH 2 , respectively, under visible light. Using LC-MS analysis and Gaussian software calculations, the degradation path of carbamazepine was explored in detail. A series of photoelectrochemical experiments revealed the efficient transfer of photogenerated charges in 1.0-MIL-68(In)-NH 2 /Bi 4 O 7 photocatalyst. The radical trapping experiments and ESR characterization suggested a reasonable S-scheme photocatalytic mechanism. In this heterojunction material, the excellent photocatalytic performance was attributed to the large surface area and S-scheme mechanism, which provides more active sites and separates the photogenerated charges rapidly.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Wei Zhao,Mengru Yan,Xinran Yang,Xiaojun Zeng,Yantong Chen,Benlin Dai,Xiaozhong Chu,Xuekun Hong,Feihu Mu,Shijie Li,Dennis Y.C. Leung
Environmental pollution caused by the overusage and uncontrolled discharge of antibiotics such as amoxicillin will endanger public health and ecosystems. Herein, a novel Ag/MIL-68(In)-NH 2 /Bi 4 O 7 plasmonic heterojunction has been successfully prepared through a two-step route followed by photoreduction for environmentally friendly photocatalytic amoxicillin degradation. Ag/MIL-68(In)-NH 2 /Bi 4 O 7 displayed the most efficient photocatalytic performance, which was 3.7 and 3.2 times that of Bi 4 O 7 and MIL-68(In)-NH 2 , respectively. The superior photocatalytic activity was directly linked to its large surface area and localized surface plasmon resonance (LSPR) effect, which provides more active sites and effectively promotes visible light absorption. Moreover, the degradation path of amoxicillin was explored in detail by combining Gaussian software calculation with liquid chromatography-mass spectrometry (LC-MS) analysis. Finally, a series of characterizations and simulations were carried out to demonstrate the S-scheme photocatalytic mechanism.
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yuefa Jia,Shiping Li,Haoxuan Ma,Jianzhi Gao,Gangqiang Zhu,Fuchun Zhang,Jun Young Park,Sangwon Cha,Jong-Seong Bae,Chunli Liu
To fully utilize the solar light, photocatalyst with broad spectrum response from UV to near-infrared (NIR) is desirable. In this work, ternary mixed valent Bi 2 O 4 -Bi 4 O 7 -BiO 2-x with rich oxygen vacancy has been synthesized through one-pot hydrothermal treatment of NaBiO 3 . The results showed that through adjusting the hydrothermal conditions, oxygen vacancy-rich Bi 2 O 4 -Bi 4 O 7 -BiO 2-x nanocomposites with much higher efficiency than single or mixed bismuth oxides (Bi 2 O 4 , Bi 4 O 7 , BiO 2-x and Bi 4 O 7 -BiO 2-x ,) can be synthesized for photocatalytic degradation of bisphenol A (BPA) under UV, visible, and NIR light irradiation. In addition, the liquid chromatography-mass spectrometer (LC–MS) characterization demonstrated that BPA was oxidized to 4-isopropenyphenol first and the rings were opened sequentially under NIR light irradiation. Further detection of reactive species indicated that holes, O 2 − , and OH were the main oxidizing species in the degradation system. The experimental observations and density functional theory (DFT) calculations suggested that both type-II and the Z-scheme charge transfer with oxygen vacancies as electrons and holes mediators were formed at the interfaces of Bi 2 O 4 , Bi 4 O 7 , and BiO 2-x , resulting in a very efficient separation of photogenerated charge carriers in the composite. This work adds to the growing potential of mixed valent bismuth oxides based photocatalysts and is expected to accelerate the pace of the development of new-generation photocatalysts with high efficiency utilizing full-spectrum solar light.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
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