JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 11
·8403-8412
·
IF 2.22
Wang Ting,Ma Qing,Gao Shang,Huang Mengshi
Highly regular TiO 2 nanotube arrays (TNTs) with interstitial nitrogen as the dominant point defect have been successfully prepared by annealing the as-anodized TNTs in N 2 in a temperature range of 400–650 °C. Using analysis methods that include field emission scanning electron microscopy, X-ray diffraction patterns, and Raman spectroscopy, the thermal stability of TNTs annealed in N 2 was found to be higher than that of TNTs annealed in O 2 . The interstitial nitrogen is considered as the dominant point defect in TNTs annealed in N 2 , which results in the notably improved thermal stability of the highly ordered TNTs. However, the content of hydroxyl oxygen on the surface of TNTs is significantly influenced by annealing temperature, which is closely related to photocatalytic activity. Optimized photocatalytic property of photodegradation of MO with a pseudo-first-order reaction constant k value of (5.065 ± 0.139) × 10 –2 h −1 is achieved for TNTs annealed in N 2 at 600 °C. These findings serve to provide simple and versatile guidelines to fabricate highly ordered TNTs with controllable point defects, enhanced thermal stability, and a high level of photocatalytic activity.
研究领域:
材料科学
·
纳米科技
·
光催化
·
表面化学
·
功能材料
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Jiaoming Wang,Xiang Yu,Xionghui Fu,Yi Zhu,Yuanming Zhang
To solve severe photocorrosion of Ag 3 PO 4 , polyaniline for transporting holes and reduced graphene oxide (rGO) for transferring electrons were co-incorporated with Ag 3 PO 4 by an in-situ precipitation procedure and a following hydrothermal method , reaching the superior carrier separation efficiency via synergetic effect of PANI and rGO. Consequently, 5% rGO/Ag 3 PO 4 /PANI exhibited the excellent photocatalytic performance of 86.2% removal rate towards ciprofloxacin (CIP) within 15 min, which was much better than Ag 3 PO 4 , Ag 3 PO 4 /PANI and many reported photocatalysts . After four consecutive cycles, the composites performed better stability with 81.0% removal rate. Generally, photocatalytic activity depended on efficiencies of light absorption ( η abs ), charge separation ( η sep ) and charge injection ( η inj ). η sep of rGO/Ag 3 PO 4 /PANI was 11.5 and 8.70 folds higher than that of Ag 3 PO 4 and Ag 3 PO 4 /PANI, while η abs and η inj of rGO/Ag 3 PO 4 /PANI were not improved compared with Ag 3 PO 4 and Ag 3 PO 4 /PANI, strongly manifesting synergetic effect of PANI and rGO on Ag 3 PO 4 accelerated the charge separation and finally enhanced the photocatalytic activity . Besides, rGO greatly improved the adsorption efficiency for CIP and the maximum adsorption capacity was enhanced to be 19.4 mg/g which was 6.88 folds than that of Ag 3 PO 4 , being advantageous to enhancing the photocatalytic activity. The work offered an excellent reference for designing and constructing photocatalysts with superior charge separation showing excellent photocatalytic performance, which were potential candidates for degrading antibiotics in environmental treatment.
研究领域:
材料科学
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环境化学
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光催化
·
纳米材料
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环境污染治理
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半导体催化
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抗生素降解
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Kexin Chen,Xi Wang,Pengfei Xia,Jinxin Xie,Jing Wang,Xukai Li,Yiming Tang,Laisheng Li
Z-scheme Cu 2 O-(rGO-TiO 2 ) photocatalyst was successfully synthesized via a simple three-step approach for 2,2′,4,4′-tretrabromodiphenyl ether (BDE47) reductive removal under simulated solar irradiation. Unlike the traditional heterojunction , the addition of reduced graphene oxide (rGO) enhanced the redox ability of Cu 2 O-TiO 2 by increasing charge transfer. When modifying Cu 2 O films by adding 1% rGO and coating with 70% TiO 2 , the resulting Cu 2 O-(rGO-TiO 2 ) exhibited the best photocatalytic activity for BDE47 removal. The charge transfers of Cu 2 O-(rGO-TiO 2 ) were proven to follow a Z-scheme pathway through the electron paramagnetic resonance analysis. The degradation pathways of BDE47 were elucidated by identifying intermediate products via gas chromatography-mass spectrometry (GC-MS) and gas chromatography (GC). Photo-electrons (e − ) generated from the conduction band of Cu 2 O and hydrogen protons (H 0 ) reduced from H + in water were the main contributing elements for the removal of BDE47, which response to the ortho and para debromination . Ortho-Br of BDE47 was attacked by e − and BDE28 was the dominant debromination product on the first stage. Then e − and H 0 attacked ortho-Br and para-Br of BDE28 to form BDE15 and BDE8, respectively. The concentration of BDE8 was higher than that of BDE15, suggesting that H 0 played the most important role on the second debromination stage. An effective Cu 2 O-(rGO-TiO 2 )-based Z-scheme system for BDE47 debromination was proposed in this study, which may contribute to the development of novel green technologies.
研究领域:
环境科学
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光催化化学
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环境污染与控制
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材料科学
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绿色技术
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有机污染物降解
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Lingwei Lu,Meilin Lv,Gang Liu,Xiaoxiang Xu
Constituting solid solutions has been an appealing means to gain control over various physicochemical properties. In this work, we synthesized a series of SrTiO 3 -BiFeO 3 solid solutions and systematically explored their structural, optical and photocatalytic properties. Our results show that all solid solutions crystallize in a primitive cubic structure and their band gap values can be easily tuned by adjusting molar ratios between SrTiO 3 and BiFeO 3 . Photocatalytic hydrogen production under both full range and visible light irradiation is greatly improved after forming solid solutions. The highest hydrogen production rate obtained is ∼180 μmol/h under full range irradiation (λ ≥ 250 nm) and ∼4.2 μmol/h under visible light irradiation (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼2.28% and ∼0.10%, respectively. The activity is found to be strongly influenced by surface area and light absorption. Theoretical calculation suggests that Fe contributes to the formation of spin-polarized bands in the middle of original band gap and is responsible for the band gap reduction and visible light photocatalytic activity .
研究领域:
材料化学
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光催化
·
能源材料
·
无机固体化学
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半导体物理
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太阳能转化
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表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Qing Cen,Qiaoyuan Gao,Chenlu Zhang,Yingqi Liu,Qi Wang,Qi Wang
In this study, visible-light-active iron tungstosilicate (FeSiW) was fabricated via solvothermal method . Fe 3+ was applied as counter ion to precipitate with silicotungstic acid (H 4 SiW 12 O 40 ) in methanol solution. It can be observed from FT-IR spectra that the Keggin structure of SiW 12 O 40 4− was well maintained in FeSiW. Besides, the effect of different initial molar ratios of Fe 3+ to H 4 SiW 12 O 40 was investigated (from 4:1 to 4:4). By photoelectrochemical characterizations, such as photocurrent response and Mott-Schottky (M-S) plots, easiest generation of electron-hole pairs and lowest charge transfer resistance can be observed on FeSiW with initial molar ratio of 4:3. Moreover, FeSiW with 4:3 ratio also displayed highest activity for photocatalytic reduction of Cr(VI), despite of the largest band gap (ca. 2.71 eV). The lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) of the optimized FeSiW were estimated to be +0.03 V and 2.74 V vs NHE, respectively, which were thermodynamically feasible for Cr(VI) reduction and H 2 O oxidation . Even under acidic condition (pH 3), the optimized photocatalyst displayed good stability in cyclic runs. Therefore, the present study opens a new way for heterogeneous polyoxometalates as efficient photocatalyst for environmental application.
研究领域:
环境化学
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材料科学
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光催化
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无机化学
·
污染治理
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Xiaoyun Chen,Dong-Hau Kuo,Dongfang Lu,Yongxuan Hou,Yen-Rong Kuo
Mesoporous TiO 2 was synthesized by a hydrolysis precipitation method with the utilization of the biological renewable resource of lignin as template and TiCl 4 as reactant. The photocatalytic activity of TiO 2 was investigated by the degradation of phenol under UV light irradiation. The microstructure, crystallinity , powder characteristic, and chemical bonding of the catalyst were analyzed. The 500 °C-calcined TiO 2 had average crystallite size of about 11.1 nm and a mesoporous structure with specific area of 165.8 m 2 /g and pore volume of 0.312 cm 3 /g. The results showed that TiO 2 synthesized with lignin template exhibited high photocatalytic activity, which can be attributed to the electronegativity and the network skeleton of lignin to uniformly distribute the TiO 2 precursor for forming TiO 2 mesoporous particles. The mechanism for the improved photodegradation of the lignin-assisted TiO 2 was proposed.
研究领域:
材料科学
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环境化学
·
纳米技术
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光催化
·
绿色化学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2013
·
IF 2.915
Bin Zeng,Xiaohua Chen,Xutao Ning,Chuansheng Chen,Aiping Hu,Weina Deng
Carbon nanotubes and reduced graphene oxides (CNTs/rGO) sphere decorated with Cu 2 O, CuO nanoparticles (Cu x O–CNTs/rGO) was successfully synthesized by spray drying and post-calcinating method for the first time. Scanning electron microscopy and transmission electron microscopy observations confirmed that CNTs/rGO formed a spherical micrometer structure and Cu x O nanoparticles were decorated on their surface. The experimental results indicated that this novel architecture enhanced photocatalytic performance with 97.5% decomposition of methyl orange (MO) after 20 min in the presence of H 2 O 2 under visible light irradiation, which was much higher than that of pure Cu x O powders (31.2%).
研究领域:
材料科学
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纳米科技
·
光催化
·
环境功能材料
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复合材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 7
·3985-3994
·
IF 11.301
Ruidi Wang,Bei-Bei Xu,Jiachen Wang,Xue Lu Wang,Ye-Feng Yao
The relationship between the structural characteristics and photocatalytic reaction mechanisms of graphitic carbon nitride (g-C3N4) still remains unclarified at the molecular level, which severely hinders the further development of this field. The present study addresses this issue by employing an innovative strategy to investigate the relationship between the H-containing structures of g-C3N4 and its water splitting properties. The exchangeable and unexchangeable protons of the H-containing groups of g-C3N4 were differentiated by selective deuteration, providing a way to distinguish the hydrophilic and relatively non-hydrophilic H-containing groups of g-C3N4. A combination of advanced solid-state NMR approaches reveals that amino group defects (CN2(NHx)) on the C–N skeleton of the photocatalyst likely serve as hydrophilic active sites for facilitating the photocatalytic hydrogen evolution reaction. Accordingly, the newly synthesized g-C3N4 sample having a high concentration of CN2(NHx) by design demonstrates an enhanced H2 yield by a factor of 17 compared to that of pure g-C3N4.
研究领域:
材料化学
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光催化
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固体核磁共振
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表面科学
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Xiu-Li Wang,Xiao-Mei Wu,Guo-Cheng Liu,Qiao-Min Li,Hong-Yan Lin,Xiang Wang
By tuning metal ions and combining with different dicarboxylates , four new semi-rigid thiophene-bis-pyridyl-bis-amide-based coordination polymers , namely, [Zn(3-bptpa)(1,3-BDC)]·DMA·2H 2 O ( 1 ), [Zn(3-bptpa)(5-MIP)] ( 2 ), [Cd(3-bptpa)(1,3-BDC)]·2H 2 O ( 3 ) and [Cd(3-bptpa)(5-MIP)]·4H 2 O ( 4 ) (3-bptpa= N,N′ -bis(pyridine-3-yl)thiophene-2,5-dicarboxamide, 1,3-H 2 BDC=1,3-benzenedicarboxylic acid, 5-H 2 MIP=5-methylisophthalic acid, DMA= N,N -dimethylacetamide), were solvothermally/hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction analyses, IR spectra , UV–vis diffuse-reflectance spectra (DRS), powder X-ray diffraction (PXRD) and thermal gravimetric analyses (TG). The structural analysis reveals that Zn-complexes 1 and 2 are similar 2D networks. While Cd-complexes 3 and 4 exhibit similar 2-fold interpenetrating 3D α -Po frameworks with the (4 12 ·6 3 ) topology. The photocatalytic properties for the degradation of methylene blue (MB) under ultraviolet light irradiation of the title complexes have been investigated in detail. Furthermore, the luminescent sensing behaviors for metal cations of 1–4 have been studied, the results indicate that 3 is an excellent fluorescent probe , with high sensitivity, selectivity , and simple regeneration, for environmentally relevant Fe 3+ ions.
研究领域:
无机化学
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材料化学
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配位化学
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环境分析
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光催化
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荧光传感
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Shunhang Wei,Rong Wu,Xiaoxiang Xu,Jikang Jian,Haixia Wang,Yanfei Sun
Black core-shelled anatase titania were successfully prepared using a simple one-step synthetic method by calcining colloid titania precursor in N 2 flow under atmospheric pressure. The physicochemical properties of the as-prepared samples were characterized by various techniques such as X-ray diffraction, high resolution transmission electron microcopy, etc. The samples demonstrate a unique core-shelled structure and electron paramagnetic resonance spectra reveal the presence of high concentration of Ti 3+ and oxygen vacancies at the surface, which accounts for their black appearance. A possible mechanism for the formation of such core–shell structure is proposed based on the results (X-ray photoelectron spectra, etc) of products prepared under different ration between urea and hydrochloric acid. Ethanol absolute is found to have critical effect in preventing phase transition of titania (from anatase to rutile) upon elevated temperatures. The black appearance of the sample powder (high visible light absorption) as well as slow electron/hole recombination rate after introducing oxygen vacancies/N species signify the core-shelled anatase titania as an efficient visible light active photocatalyst.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
·
无机合成
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xingyan Liu,Tianrong Xiong,Yonggang Xu,Kunhe Yang,Youzhou He,Haifeng Yang,Hong Wu,Jiajia Jing,Siqi Li,Siping Wei
Defect engineering for MOFs is a promising approach to accelerate the charge transfer to further enhance the photocatalytic performance. Up to now, the current defect engineering strategy for MOFs mainly focuses on a single adjustment mode with the apparent ceiling effect, whether the further break out of the ceiling effect could be achieved through the combination of two or more adjustment modes is still in its infancy. In this work, the original NH 2 -MIL-125 was firstly adjusted by a single adjustment mode in ethanol solvothermal method to obtain partially linker defective NM-125-X (where X signifies the distinct temperatures used in the solvothermal treatment, with optimal results observed at X = 120). Subsequently, the NM-125-120 was further re-regulated by adjusting the ligand defects through another adjustment mode in water heating agitation, resulting in the ultimate defective NM-125-120-65. The NM-125-120-65 obtained through double defect engineering avenue showed superior photocatalytic performance with the hydrogen production rate of 11585.23 μmol·g −1 , which was 1.23 and 14.05 times as those of partially defective NM-125-120 (9427.65 μmol·g −1 ) and original NH 2 -MIL-125 (824.85 μmol·g −1 ), respectively. In addition, the NO removal rate of NM-125-120-65 was 64.8 % also higher than that of NM-125-120 (37.8 %) and NH 2 -MIL-125 (23.6 %). Through a series of comparative experiments, especially TGA and XPS, it was noted that the ligand defective NH 2 -MIL-125 can be formed by ethanol solvothermal method, and it was also confirmed that through further re-regulating the ligand defects in water heating agitation, the linker defects could also be further expanded. The PL emission spectra, IT diagrams, and EIS measurements displayed that the NM-125-120-65 had outstanding conductivity and excellent electron mobility compared to NM-125-120 and NH 2 -MIL-125. This work provided a novel approach for the subsequent defect engineering by another adjustment mode based on the existing defective MOFs via double linker defect engineering adjustment modes, so as to further obtain better photocatalytic performance for solving the environmental and energy crisis.
研究领域:
材料科学
·
环境化学
·
能源化学
·
光催化
·
纳米材料
·
物理化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 44
·期 3
·1586-1596
·
IF 4.229
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Shilin Yang,Qi Zhu,Wei Zhou
TiO 2-x /g-C 3 N 4 /CdS ternary heterojunctions are fabricated through thermal polymerization-chemical bath deposition combined with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, Fourier transform infrared spectra , scanning electron microscopy, transmission electron microscopy , nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions are formed successfully and CdS quantum dots (QDs) and TiO 2 are anchored on surface of g-C 3 N 4 nanosheets simultaneously. The visible-light-driven photocatalytic degradation ratio of Bisphenol A and hydrogen production rate are up to 95% and ∼254.8 μmol h −1 , respectively, which are several times higher than that of pristine TiO 2 . The excellent visible-light-driven photocatalytic activity can be ascribed to the synergistic effect of TiO 2−x , g-C 3 N 4 and CdS QDs which extend the photoresponse to visible light region and favor the spatial separation of photogenerated charge carriers.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境催化
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）