Materials
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2020
·Vol. 13
·期 17
·3811
·
IF 3.057
Zhiquan Huang,Leicheng Li,Zhiping Li,Huan Li,Jiaqi Wu
Herein, novel ternary kaolin/CeO2/g-C3N4composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2and g-C3N4nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4composite is a promising solid catalyst for environmental remediation.Keywords:kaolin;CeO2;g-C3N4;visible-light irradiation;photocatalytic degradation
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Jinhui Huang,Wenjian Cheng,Yahui Shi,Guangming Zeng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
A metal-free modified carbon nitride MCU(DMSO)-C 3 N 4 (3:3:1) with a honeycomb-like morphology was prepared via firstly introducing cyanuric acid and urea into melamine in dimethyl sulfoxide (DMSO) as the precursor for the MCU-C 3 N 4 . A variety of characterization methods, including XRD, XPS, FT-IR, SEM, TEM , UV–vis, photoluminescence (PL), and photocurrent generation, were applied to investigate the structure, morphology, optical, and photoelectrochemical properties of the g-C 3 N 4 and MCU-C 3 N 4 (3:3:1). Rhodamine B (RhB), methylene blue (MB), and bisphenol A (BPA) were selected as target pollutants to evaluate photocatalytic activity of the MCU-C 3 N 4 (3:3:1) under visible light irradiation. MCU-C 3 N 4 (3:3:1) exhibits significantly enhanced photocatalytic activity compared with g-C 3 N 4 , where 99.49% RhB is removed within 40min, 97.7% MB is removed within 80 min, and 84.37% BPA is removed within 90 min. The improved photodegradation efficiency was mainly due to the larger surface area, the stronger REDOX ability, and the increased separation efficiency of photogenerated electron-hole pairs. The active radical trapping experiments and electron spin resonance tests indicated that h + and O 2 − radicals were the dominant active species whereas OH radicals could be a minor factor. A possible photocatalytic mechanism is proposed. This strategy here provides an ideal platform for the design of photocatalysts with large surface area and high porosity for various pollutant controlling applications.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 9
·646
·
IF 3.8
Jingfei Luan,Yang Xiao,Liang Hao,Ye Yao,Bowen Niu,Guangmin Yang,Yichun Wang
For the first time, a novel catalyst named Dy2EuSbO7was successfully synthesized via the high-temperature solid-state sintering method (HTSSM). Dy2EuSbO7/ZnBiDyO4heterojunction photocatalyst (DZHP) was fabricated through the HTSSM for degrading chlorpyrifos (CPS) in the pesticide wastewater under visible light irradiation (VSLID). Under VSLID, DZHP could effectively degrade CPS in pesticide wastewater. The experimental outcomes suggested that the kinetic curve with the Dy2EuSbO7/ZnBiDyO4heterojunction (DZH) as a photocatalyst for the reduction of CPS under VSLID conformed to the first-order kinetics (FOKT). After VSLID of 156 min, the photocatalytic degradation (PTD) removal rate of CPS using DZH as photocatalyst was 1.12 times, 1.21 times, or 2.96 times that using Dy2EuSbO7as a photocatalyst, ZnBiDyO4as a photocatalyst, or nitrogen-doped titanium dioxide as a photocatalyst. After VSLID of 156 min for four cycle degradation tests (FCDTS) with DZH as a photocatalyst, the removal rate of CPS reached 98.78%, 97.66%, 96.59%, and 95.69%, respectively. Above results indicated that the DZHP possessed high stability. Experiments with the addition of trapping agents showed that hydroxyl radicals (•OH) owned the strongest oxidative removal ability for degrading CPS compared with superoxide anions (•O2−) or holes (h+). The oxidation capacity of three oxidation radicals for eliminating CPS was ranked in the ascending order as follows: h+< •OH < •O2−. Lastly, the possible degradation pathway and degradation mechanism of CPS were discussed in detail. A visible light responsive heterojunction catalyst with high catalytic activity and a photocatalytic reaction system which were capable of efficiently removing toxic organic pollutants from pesticide wastewater were obtained.
研究领域:
环境科学
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催化材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Tong Wu,Hui Zheng,Yichuan Kou,Shilei Jin,Yuhong Jiang,Ming Gao,Lei Chen,Naveen Reddy Kadasala,Yang Liu
In this study, 3D Fe 3 O 4 micro-flowers were synthesized by the self-assembly approach, then rhombic dodecahedral Cu 2 O was successfully loaded onto their surface by wet chemical method . Ag nanocrystals were reduced in situ on the surface of Fe 3 O 4 /Cu 2 O composites to prepare novel Fe 3 O 4 /Cu 2 O/Ag composites. The composites were characterized by SEM, TEM, XRD , XPS, VSM and UV–Vis diffuse reflectance spectroscopy. The effect of Ag nanocrystals on the photocatalytic performance of the Fe 3 O 4 /Cu 2 O composites was investigated by the degradation of methyl orange under visible light irradiation, and the Fe 3 O 4 /Cu 2 O/Ag composites showed higher photocatalytic efficiency than the Fe 3 O 4 /Cu 2 O composites. Photoelectrochemical and PL measurements were carried out to investigate the synergistic effect between the semiconductors and Ag nanocrystals and it was confirmed that the Fe 3 O 4 /Cu 2 O/Ag composites effectively inhibited the recombination of electron-hole pairs, thus improving the photocatalytic activity. The fact that the Fe 3 O 4 /Cu 2 O/Ag composites could be magnetically recycled and that they retained more than 90% of their original activity after six repeated experiments indicates, that they show great potential for wastewater treatment applications.
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
ACS Applied Nano Materials
·
2023
·
IF 5.9
Liang-Liang Chen,Wen-Pu Shi,Tuo-Di Zhang,Wen-Juan Lin,Ya-Qing Zhou,Xiao-Qian Jin,Huan Liang,Wei-Hong Guo,Da-Chuan Yin
The use of natural proteins is a green and effective method for synthesizing silver nanoparticles (AgNPs). Aromatic amino acids of proteins play a reducing role in synthesis, and proteins are coated on the surface of AgNPs to play the role of stabilizers. In this study, we developed an efficient one-step method for synthesizing AgNPs using lysozyme (LYZ) under visible-light irradiation from a xenon lamp in situ. The light conditions and LYZ structure could substantially affect the synthesis. Antibacterial and scald-wound healing results showed that LYZ/AgNPs had broad-spectrum and efficient antibacterial activity and promoted scald-wound healing. Therefore, the proposed synthesis method and LYZ/AgNPs have good practical application prospects.
研究领域:
材料科学
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生物技术
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纳米技术
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伤口愈合
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
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IF 3.313
Yuanchen Hong,Penghui Shi,Peifu Wang,Weifeng Yao
CdS were synthesised in situ on graphene oxide (GO) using a simple solvothermal method . GO in the prepared powders was then photoreduced into RGO to form the CdS/GO composites. The samples were characterised by using the X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), fluorescence spectrum and Raman spectrum . The prepared CdS/RGO exhibited much higher activity for H 2 evolution than CdS or CdS mechanically loaded with GO under visible light irradiation (>420 nm). The improved photocatalyst performance of CdS/RGO was attributed to enhancement of the connection between CdS and RGO sheets, which accelerates the effect of the separation of photoinduced electrons and holes by transferring the photoinduced electron to RGO sheets.
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 COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Chang Ping Yang,Cong Yi Hu,Zhong Wei Jiang,Si Yu Xiao,Xiao Yan Wang,Cheng Zhi Huang,Yuan Fang Li,Shu Jun Zhen
The slow conversion of Fe(Ⅱ)/Fe(III) cycle was largely limited the degradation efficiency of many photo-Fenton systems. Herein, four Fe-MOFs nanorods (namely Fe-TCPP-1, Fe-TCPP-2, Fe-TCPP-3, Fe-TCPP-4) with decreasing length-diameter ratios were synthesized in a household microwave oven, using photosensitizer porphyrin and iron ions with Fenton activity as building blocks. Among them, the Fe-TCPP-3 exhibited high photogenerated electron-hole ( e − - h + ) separation efficiency and largest pore structure , endowing Fe-TCPP-3 with superior photo-Fenton property. In addition, Fe-TCPP-3 based photo-Fenton system was applied to efficiently degrade antibiotic ciprofloxacin (CIP) under neutral condition, due to the continuously generated reactive species ( h + , e − , OH · , O 2 ·– , 1 O 2 ) in Fe-TCPP-3 under visible-light irradiation. With irradiation for 30 min, the degradation efficiency of the system could reach about 73 %, which was about 26-fold towards the system without light irradiation . This study paved a way to modulating the photo-Fenton activity of MOF-based catalysts.
研究领域:
材料科学
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环境化学
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光化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lizhen Lu,Haoyu Zhang,Zhe Sun,Jinghui Wang,Haolin Wang,Jinbo Xue,Qianqian Shen,Qi Li
An interesting photocatalytic memory effect was found in 2D ultrathin BiOBr nanosheets, which endowed them the capability to trap photogenerated electrons on Bi 3+ and Br - in this material system for an extended period of time and resulted in the creation of stable oxygen vacancies (Ov) by just visible light irradiation due to the charge balance requirement. Thus, a broader visible light absorption, more negative conduction band minimum, stronger piezoelectric response, better charge carrier separation and transfer, and enhanced CO 2 adsorption and activation were occurred in these BiOBr nanosheets with prior visible light irradiation, all of which were beneficial for their enhanced CO 2 reduction performances in photocatalysis, piezocatalysis, and photopiezocatalysis, respectively, than their counterparts without it. This work demonstrated a novel approach to create oxygen vacancies by light irradiation through the photocatalytic memory effect, which could be readily applied to similar photocatalyst systems to boost their performances and generate novel functionalities.
研究领域:
材料科学
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环境科学
·
光催化技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xilin Liao,Ting-Ting Li,Hai-Tao Ren,Zhiyong Mao,Xuefei Zhang,Jia-Horng Lin,Ching-Wen Lou
A BiFeO 3 /TiO 2 p-n heterojunction photocatalyst with ferroelectric synergistic effect under visible-light irradiation was developed through facile hydrolysis and precipitation by forming nanospheres of TiO 2 on BiFeO 3 nanocube to improve the photocatalytic efficiency. Analyses of the microstructure, optical properties , and photoelectrochemical performance indicate the formation of a core–shell heterostructure of BiFeO 3 /TiO 2 with excellent energy band matching. The BiFeO 3 /TiO 2 p-n heterojunction has enlarged specific surface area, higher sensitivity to visible-light, and improved separation and transfer efficiency of photoelectron-hole pairs than single TiO 2 and BiFeO 3 . Moreover, the composite exhibits superior photocatalytic degradation performance for methylene blue (MB) and common antibiotic tetracycline (TC) under UV and visible-light irradiation. The MB degradation rate within 180 min reaches 78.4% and 90.4% under UV and visible-light irradiation, respectively. Furthermore, the enhanced photocatalytic mechanism of BiFeO 3 /TiO 2 is explored by photoluminescence (PL), electrochemical impedance spectroscopy (EIS), transient photocurrent analysis, radical quenching, and band structure characterization.
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
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Fang Li,Wei Zhao,Dennis Y.C. Leung
Photoelectrocatalytic hydrogen production is a clean and sustainable way to combat energy crises and environmental issues. The performance of BiVO 4 which acts as a promising photoanode could be effectively enhanced by loading with Bi nanoparticles. In this study, a viable method to fabricate Bi/BiVO 4 electrode was proposed to enhance hydrogen production through a photoelectrocatalytic reaction. The results indicated that Bi nanoparticles loaded under optimal condition could obviously increase the photocurrent density of the BiVO 4 electrode from 0.9 mA cm −2 to 2.0 mA cm −2 under visible light illumination. Furthermore, the photoelectrochemical hydrogen production efficiency could have a 2.5-fold improvement with the addition of 20 ppm phenol. The possible mechanism of the enhanced performance and the function of phenol in the overall reaction was discussed.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 30
·15710-15714
·
IF 7.443
Ming Wu,Jun-Min Yan,Xue-Wei Zhang,Ming Zhao,Qing Jiang
Ag2O modified g-C3N4 (Ag2O/g-C3N4) was synthesized by a facial hydrothermal reaction. The as-prepared Ag2O/g-C3N4 shows efficient photocatalytic properties for hydrogen evolution from water splitting under visible light irradiation. The rate is about 274 times higher than that of pure g-C3N4, and is even better than that of Pt/g-C3N4. More importantly, Ag2O/g-C3N4 also demonstrates a relatively good recycling stability for photocatalytic hydrogen evolution.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Jiajia Wang,Lin Tang,Guangming Zeng,Yaocheng Deng,Yani Liu,Longlu Wang,Yaoyu Zhou,Zhi Guo,Jingjing Wang,Chen Zhang
Although photocatalytic degradation is an ideal strategy for cleaning environmental pollution, it remains challenging to construct a highly efficient photocatalytic system by steering the charge flow in a precise manner. In this study, a novel atomic scale g-C 3 N 4 /Bi 2 WO 6 heterojunction (UTCB) constructed by ultrathin g-C 3 N 4 nanosheets (ug-CN) and monolayer Bi 2 WO 6 nanosheets (m-BWO) was successfully prepared by hydrothermal reaction. The UTCB heterojunctions were characterized by various techniques including XRD, TEM, AFM, BET measurements, UV–vis spectrometry, and XPS. The results indicated that UTCB heterojunctions were assembly of m-BWO on ug-CN and presented high separation efficiency of photogenerated carriers. Under visible light irradiation, the optimum molar ratio of ug-CN/m-BWO (1:4, UTCB-25) reached almost 96.1% removal efficiency of IBF within 1 h, which was about 2.7 times as that of pure m-BWO. The photocatalytic mechanisms of UTCB-25 were revealed, suggesting that the synergistic effect of UTCB-25 heterojunction with strong interfacial interaction promoted the photoinduced charge separation. According to the LC–MS/MS, five photodegradation pathways of IBF under visible light irradiation were proposed. This study could open new opportunities for the rational design and a better understanding of atomic scale two dimensions/two dimensions (2D/2D) heterojunctions in environmental or other applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）