JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jing Niu,Zhelin Song,Xin Gao,Yun Ji,Yanlin Zhang
It is of great significance to achieve superior degradation of contaminants by developing efficient and stable photocatalysts . To boost the photocatalytic performance of Bi 2 WO 6 for tetracycline degradation, the Bi 2 WO 6 composites ( Bi 2 WO 6 /C@Cu 2 O) were constructed by introducing Cu 2 O coated by carbon layer (C@Cu 2 O with 5 wt% of Bi 2 WO 6 ) in this study. Bi 2 WO 6 /C@Cu 2 O presents an excellent performance on tetracycline degradation because of the generation of more active species as ∙ O 2 - and ∙ OH. Its kinetic rate constant k was 2.8 times of pure Bi 2 WO 6 and tetracycline degradation efficiency maintained outstanding stability even after 4 cycles. This benefits from the higher photogenerated charge separation and electron transfer possessed by Bi 2 WO 6 /C@Cu 2 O compared to Bi 2 WO 6 . Various intermediates of tetracycline degradation were identified and the possible degradation pathways were proposed. The tetracycline degradation by Bi 2 WO 6 /C@Cu 2 O followed a Z-scheme photocatalysis mechanism. In addition to acting as the protective layer of Cu 2 O to attenuate the photo-corrosion of Cu 2 O, the oxygen containing functional groups C O on the surface of carbon layer could provide an electron transfer channel between the interface of Bi 2 WO 6 and Cu 2 O to reduce the interfacial charge-transfer resistance and accelerate the electron transfer.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Zibo Dong,Zhaoyang Wang,Tiantian Yang,Hange Feng,Lingwei Li,INAAM ULLAH,Shaolin Xue
s Among many photocatalysts , the low charge separation efficiency has been an essential reason limiting photocatalytic performance. The heterojunction is a well-established strategy, but the strength of the interfacial electric field constructed by different Fermi energy levels is very limited. In this paper, the simple hydrothermal method is used to selectively deposit growth of MoS 2 on the PbTiO 3 (00 1 ̅ ) surface thereby constructing S-scheme heterojunctions with interfacial electric fields enhanced by polarization properties and bound charges. The enhanced interfacial electric fields offer a strong motivation for the separation and migration of photogenerated carriers. In addition, the oxygen vacancies and photo deposited Pt on the PbTiO 3 (001) surface provide sufficient active sites for hydrogen production , while the petal-like MoS 2 on the PbTiO 3 (00 1 ̅ ) surface can effectively adsorb pollutants for degradation. In the presence of pollutants (TC) as sacrificial agents, the MoS 2 /PbTiO 3 composites with enhanced interfacial electric fields showed excellent photocatalytic hydrogen production performance with hydrogen productivity of 217.09 µmol g −1 h −1 , which is 4.56 times higher than that of pristine PbTiO 3 (47.61 µmol g −1 h −1 ). This study suggests that S-scheme heterojunctions enhanced by polarization properties and bound charges will show significant potential in improving charge separation efficiency.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Jin Chen,Suqing Qin,Xiaofeng Yang,Yueying Wang,Tai Yang,Meidan Que,Yuzhao Ma,Yanjun Li
BiOBr can effectively mitigate the ecological and environmental problems caused by pollution with antibiotics, and its photocatalytic properties can be improved by utilizing heterojunction structures and cocatalysts. In this study, the Z-scheme heterojunction ternary photocatalyst BiOBr/g-C 3 N 4 /CQDs (BCC x ) was obtained by using an uncomplicated electrostatic self-assembly process. The incorporation of carbon quantum dots (CQDs) with high conductivity provided a conduit for charge transfer between g-C 3 N 4 and BiOBr. The loading density of CQDs on BiOBr/g-C 3 N 4 could be rapidly adjusted by changing the concentration of the CQDs precursor in solution. The presence of CQDs enhanced the absorption of visible light and inhibited the synthesis of photogenerated charge carriers, thereby resulting in a synergistic effect on the Z-scheme heterojunction and improving the photocatalytic properties under visible light. In particular, BCC50 had the highest catalytic performance, with a tetracycline pollutant degradation efficiency of 100% within 60 min. The degradation efficiency remained above 95% even after repeated use in five cycles. The principles of semiconductor energy bands and internal electrostatic field generation are applied to explain the photocatalytic mechanism responsible for tetracycline degradation using BiOBr/g-C 3 N 4 /CQDs.
研究领域:
环境科学
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材料科学
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光催化技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zheshan Duan,Xike Tian,Zihan Zhuang,Yulun Nie,Yong Li,Jianbo Shi
Persulfate (PS) has been proven to be a promising oxidant in the in-situ chemical oxidation (ISCO) process, but its practical application is severely limited due to low utilization rates. This study proposed to prepare a slow-release PS material (Gel-PS) via a green encapsulating method by regulating the mass fractions of gelatin aimed to the continuous and sustainable degradation of tetracycline (TC) in water. The results showed that the 20 % Gel-PS exhibited the best slow-release performance, and the release period reached 11 days and even above 15 days under static and dynamic conditions, respectively. Besides, Gel-PS had a long-term oxidation ability without the aid of catalyst and TC degradation efficiency consistently exceeded 40 % within 6 days. The cumulative TC degradation amount by Gel-PS was 2.18 times higher than single PS system. When Gel-PS was in-situ injected, the degradation efficiency of TC increased to over 70 % and the cumulative amount improved by 1.4 times and 2.96 times compared to Gel-PS hydrogel and single PS. The TC degradation mechanism was further explored based on a series of quenching experiments and EPR analysis. In addition to PS direct oxidation, the contribution of SO 4 •− to TC degradation generated from PS activation by alkaline groups in gelatin even reached to 42.11 %. This work provides an efficient and expandable functionalized PS-based oxidant for in-situ continuous and sustainable water remediation.
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
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Mingtao Wang,Shijie Wang,Zhenzi Li,Xuepeng Wang,Liping Guo,Haixia Liu,Lijun Liao,Wei Zhou
Photocatalysis is an alternative for antibiotics removal from wastewater for the sustainable development of human society. However, applying photocatalysts for antibiotics (e.g., tetracycline) degradation under practical conditions is highly restricted by the low reaction efficiency due to the prompt charge recombination. Constructing porous heterojunctions is an efficient way to regulate the electron transfer path and accelerate charge migration efficiency. Herein, TiO 2 /defective UiO-66 porous octahedral S-scheme heterojunctions are successfully fabricated through an in-situ growth strategy. The strong interaction and charge migration behavior between TiO 2 and defective UiO-66 have been studied using X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements. The photocatalytic removal efficiency of tetracycline is notably improved by forming TiO 2 /defective UiO-66 porous heterojunctions. The promoted photocatalytic performance can be ascribed to the strong interaction between TiO 2 and defective UiO-66, and the accelerated charge separation and transfer efficiency due to the formation of S-scheme heterojunctions, thus generating abundant reactive oxygen species, including O 2 − and OH. The optimized 38-TiO 2 /UiO-66-300 can eliminate 97.9 % of tetracycline in 60 min with a reaction constant rate of 0.0425 min −1 , which is approximately 4 and 10 times that of pristine TiO 2 and UiO-66-300, respectively. This work provides an alternate strategy for preparing highly active heterojunction photocatalysts for environmental applications.
研究领域:
环境科学
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材料科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Chunhua Li,Luqian Bao,Yubo Shi,Zhehang Tian,Yixin Ji,Mengyao Cui,Zhilei Zhao,Xianyou Wang
A hollow heterojunction of W-Zr-MOF-NH 2 @TpTt-COF (WZT) was fabricated by combining etched W-Zr-MOF-NH 2 with TpTt-COF. WZT, synthesized through acid etching and hydrothermal methods, showed better tetracycline degradation than pure W-Zr-MOF-NH 2 and pure TpTt-COF due to its larger specific surface area and more active sites. The surface of WZT contains abundant oxygen vacancies (OVs) that capture electrons, promoting the separation of photogenerated e - -h + pairs and increasing WZT’s photocatalytic activity. WZT (1:1, mass) showed 87% degradation of tetracycline under 300 W Xenon lamp irradiation. The results of cycling experiments demonstrated the high stability and reusability of WZT (1:1), making it feasible for production. The excellent photocatalytic degradation of tetracycline by WZT (1:1) originates from the formation of heterojunctions and the presence of surface OVs, which reduces the strong photogenerated e - -h + complexation efficiency. Possible photocatalytic degradation mechanisms are proposed while demonstrating the formation of Z-scheme heterojunction in WZT, which aligned with the experimental results of electron spin resonance (ESR). The tetracycline oxidative decomposition process involves the participation of •OH, 1 O 2 , • O 2 - , e - , and h + as proven by ESR and radical trapping experiments. This work proposes a research idea to prepare high-performance photocatalysts with MOF@COF type, featuring OVs-rich and Z-scheme heterojunctions.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 49
·36181-36192
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IF 3.9
Bo Zhang,Chaoqi Li,Shasha Liu,Lixuan Zhuang,Weiqi Zhang,Limei Huang,Zhenzhen Jia,Dongdong Chen,Xiang Li
A CaMnO3/g-C3N4 heterostructure, demonstrating promising photocatalytic performance for tetracycline (TC), was successfully synthesized using a straightforward calcination approach in this study. A series of characterization methods were employed to assess the physicochemical properties and visible-light responsiveness of the synthesized photocatalysts. The photocatalytic degradation rates of TC for the three prepared samples were evaluated. The results indicate that the CaMnO3/g-C3N4 composite exhibits the highest photocatalytic activity under visible-light irradiation, surpassing that of the individual components. Specifically, the degradation rate of CaMnO3/g-C3N4 is 0.031 min−1, which is 2.07 and 2.82 times greater than that of the pristine g-C3N4 and CaMnO3, respectively. Our findings highlight the significant potential of eco-friendly perovskites in developing visible-light-activated g-C3N4-based heterostructures for practical photocatalytic applications.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Bolong Zhao,Yulong Ma,Yonggang Sun,Guangsuo Yu,Juan Zhang,Li Zhu,Min Xu,Lei Wang,Duoning Zhao,Wenxin Ji,Yuanyuan Li,Yongsheng Ren
The traditional H 2 O 2 oxidation treating high-salt industrial wastewater is confronted with challenges, because of the inhibition of Cl - on oxidant radical. Thus, a non-radical pathway for H 2 O 2 removal of organic pollutants is optional. Herein, an innovative cobalt nitrogen-doped carbon (Co-N 5 -C) catalyst was constructed with an atomically dispersed asymmetrical high-density of Co-N 5 sites and highly active intermediate Co-OH groups, achieving highly selective converting H 2 O 2 to 1 O 2 through three steps electron transfer pathways. The oxidation of tetracycline by ¹O₂ accounted for 95.6 % of the total removal. H 2 O 2 is initially activated at the Co-N 5 site, which generates the active intermediate Co-OH groups. This Co-OH group then further activates H 2 O 2 , leading to the production of •O 2 - /•OOH. The newly produced •O 2 - /•OOH are instantaneously captured by neighboring Co-OH groups and subsequently converted into 1 O 2 . These adjacent catalytic sites could effectively capture and stabilize the short-lived radicals through the distance effect. and the intermediate Co-OH group in the reaction significantly reduces the energy barrier for H 2 O 2 conversion to •O 2 - /•OOH and 1 O 2 conversion by 0.26 eV and 11.12 eV, respectively. The efficiency of tetracycline degradation at 96 % even with the Cl - concentration as high as 7000 mg/L.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Yao Wang,Pengzhan Zhang,Fan Li,Liang Zhang,Bing Xu,Kangkang Wang,Zhixian He,Yuyan Sun,Shengnan Zhang
Bi 3 NbO 7 loaded on porous carbon (BNO/PC) composite materials has been prepared by the in-suit sol-gel method. The photocatalytic efficacy of the BNO/PC composite has been evaluated by degrading tetracycline (TC) in an environment of visible light and hydrogen peroxide. Moreover, the relevant influencing factors of TC degradation efficiency have been explored through a series of condition optimization experiments. UV–vis DRS and PL tests showed that the loading on porous carbon significantly broadens the visible light response range of the catalyst and improves the separation efficiency of photogenerated carriers. Compared with the bare BNO, the specific surface area and average pore diameter of the BNO/PC composite material increased greatly. The optimal sample of 35 % BNO/PC exhibited outstanding visible light response ability and excellent charge separation efficiency. The “cata + H 2 O 2 +vis” system had the highest photocatalytic activity, with TC degradation reaching 86.9 % after 60 min of visible light illumination. The addition of hydrogen peroxide (H 2 O 2 ) promoted the formation of more powerful active substances. Following this, a mechanism for photocatalytic degradation has been proposed.
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
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yingnan Zhao,Xinyu Zhao,Zhongling Lang,Huiying Sun,Zhilu Du,Huaqiao Tan,Tianyu Qiu,Wingkei Ho,Zhao Zhao,Yonghui Wang
Phase junction can effectively improve spatial charge separation due to its good lattice matching at the interface. Developing phase junction materials with good visible light absorption and suitable electronic band structure is greatly important for photocatalytic environmental purification. In this work, we combined the P and I phases of Cu 2 MoS 4 (CMS) by one-step solvothermal in situ phase transition route. The as-prepared samples are labeled as CMS-X, where X represents the reaction time (X = 2, 4, 6, 8, 10, 12, 24 h). XRD , SEM, HRTEM , and XPS confirmed the existence of the phase junction structure. Photocatalytic experiments revealed that the phase junction samples exhibit excellent photocatalytic performance and durability for methyl orange (MO) and tetracycline (TC) degradation. Among the samples, CMS-8h showed optimal phase composition and the best photocatalytic degradation performance. Approximately 50 ml of 20 ppm MO can be completely degraded within 8 min under visible light irradiation, which is approximately 12.5 and 10 times faster than that of pure phase P-CMS and I-CMS respectively, presenting the best photocatalytic efficiency of CMS. Photocatalytic mechanism studies combined with theoretical calculations demonstrated that CMS-8h (PI-CMS) possesses a typical type-II heterojunction structure, which significantly accelerates the separation of photogenerated carriers and reduces their radiation recombination. The synergistic effect of the advantages of each phase and optimized interfacial band alignment endow PI-CMS with highly efficient and long-lasting photocatalytic activity for organic pollutant degradation.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Mengjie Lu,Min Liu,Yaxin Wei,Huihui Xie,Wenbo Fan,Junzi Huang,Jindou Hu,Peng Wei,Weidong Zhang,Yahong Xie,Ying Qi
Cerium dioxide (CeO 2 ) semiconductor has received wide attention in the field of energy and environment due to its excellent oxygen storage capacity and abundant oxygen vacancies (OVs). Previous research demonstrated that the morphology and structure of the crystal had great influence on the physicochemical properties of the material. Herein, CeO 2 nanomaterials with different morphologies were prepared via a facile hydrothermal and template method. Systematic material characterizations suggested that the synthetic CeO 2 has different morphologies with CeO 2 nanorods (NRs), nanocubes (NCs), nanosheets (NSs), hollow spheres (HSs), and mesoporous CeO 2 (m-CeO 2 ), respectively. The visible-light-induced degradation performance of CeO 2 with different morphologies was investigated in aqueous solution using the antibiotic tetracycline (TC) as a model pollutant. The experimental results exhibited that the CeO 2 NRs possessed the best adsorption capacity and photocatalytic activity and more than 89.35% TC could be removed within 90 min. Combined with the XPS characterization results implied that the concentrations of Ce 3+ and OVs on the surface of CeO 2 with different morphologies were discrepancy, and the improved photocatalytic performance of CeO 2 NRs was mainly due to the higher concentration of Ce 3+ and OVs on the catalyst surface. These results confirmed that the regulation of the morphology of CeO 2 could effectively enhance its photocatalytic activity. Furthermore, the results of active species trapping experiments proved that the super oxide anion (•O 2 - ) radical and hole (h + ) played dominant roles in the degradation of TC.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Longbo Jiang,Xingzhong Yuan,Guangming Zeng,Jie Liang,Xiaohong Chen,Hanbo Yu,Hou Wang,Zhibin Wu,Jin Zhang,Ting Xiong
Artificial Z-scheme photocatalyst can not only reduce the recombination of photogeneraged electron–holepairs, but also retain prominent redox ability. In this study, direct solid-state dual Z-scheme WO 3 /g-C 3 N 4 /Bi 2 O 3 photocatalyst was successfully synthesized by one step co-calcination stratage using tungstic acid, melamine and bismuth (III) nitrate pentahydrate as the precursors. Surface, morphological, and structural properties of the resulting materials were comprehensive characterized by XRD, XPS, SEM, TEM, UV–vis diffuse reflection spectroscopy, BET surface areas, photoluminescence and ESR analysis. The WO 3 /g-C 3 N 4 /Bi 2 O 3 composite exhibited superior photocatalytic activities for tetracycline degradation than that of pure g-C 3 N 4 , WO 3 , Bi 2 O 3 and their binary composites under visible light irradiation. The enhanced photocatalytic performance of WO 3 /g-C 3 N 4 /Bi 2 O 3 composite can be ascribed to improved visible light absorption, increased surface area and enhanced separation efficiency of photo-generated electron-hole pairs. In addition, the photocatalyst exhibits high stability and reusability. On the basis of the results, a novel direct solid-state dual Z-scheme photocatalytic mechanism was also proposed.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）