Science China-Materials
·
2018
·Vol. 61
·期 7
·1001-1006
·
IF 4.318
Zhang Guo-Qiang,Ou Wei,Xu Yang-Sen
氢能源是未来最理想的清洁能源, 可以利用太阳能和光催化材料分解水获得. 开发廉价、 资源丰富、 环境友好的光催化材料, 成为近年来能源和环境领域的研究热点. 基于此, 我们报道了一种新型有机光催化材料-不含金属的荧光素超分子纳米片, 其在可见光下显示出高效的光催化分解水产氢活性, 产氢速率接近341 μmol g −1 h −1 , 在420±10 nm的波段下表观量子效率达到1.2%. 这是荧光素超分子晶体首次被报道并应用于可见光下分解水产氢, 这一发现丰富了有机和超分子光催化剂的种类.
研究领域:
光催化
·
能源材料
·
超分子化学
·
清洁能源
·
光化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Yanfeng Wang,Wei Chen,Xiao Chen,Huajun Feng,Dongsheng Shen,Bin Huang,Yufeng Jia,Yuyang Zhou,Yuxiang Liang
CdS/MoS 2 , an extremely efficient photocatalyst , has been extensively used in hydrogen photoproduction and pollutant degradation . CdS/MoS 2 can be synthesized by a facile one-step hydrothermal process. However, the effect of the sulfur source on the synthesis of CdS/MoS 2 via one-step hydrothermal methods has seldom been investigated. We report herein a series of one-step hydrothermal preparations of CdS/MoS 2 using three different sulfur sources: thioacetamide, l -cysteine, and thiourea . The results revealed that the sulfur source strongly affected the crystallization, morphology, elemental composition and ultraviolet (UV)–visible-light-absorption ability of the CdS/MoS 2 . Among the investigated sulfur sources, thioacetamide provided the highest visible-light absorption ability for CdS/MoS 2 , with the smallest average particle size and largest surface area, resulting in the highest efficiency in Methylene Blue (MB) degradation. The photocatalytic activity of CdS/MoS 2 synthesized from the three sulfur sources can be arranged in the following order: thioacetamide > l -cysteine > thiourea . The reaction rate constants ( k ) for thioacetamide, l -cysteine, and thiourea were estimated to be 0.0197, 0.0140, and 0.0084 min −1 , respectively. However, thioacetamide may be limited in practical application in terms of its price and toxicity, while l -cysteine is relatively economical, less toxic and exhibited good photocatalytic degradation performance toward MB.
研究领域:
材料科学
·
环境化学
·
纳米催化
·
光催化
·
无机功能材料
·
能源材料
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 27
·期 12
·3053-3059
·
IF 1.911
Nianjun Kang,Dongbo Xu,Weidong Shi
In recent years, the excessive use of antibiotics has become a serious problem for human health. BiVO 4 regarded as one of the most promising visible-light-driven photocatalysts was used to degrade the antibiotics. In this paper, we fabricated Bi/BiVO 4 plasmonic photocatalysts which enhanced the photocatalytic activity of BiVO 4 for degradation of tetracycline (TC) antibiotic. The Bi/BiVO 4 photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy . In addition, the photocatalytic experiment results show that the 0.04-Bi/BiVO 4 sample has the best photocatalytic activity for 2 times than the pure BiVO 4 photocatalyst. The cycle experiments, after four repetitions of the experiments, showed the sample still maintained a high photocatalytic activity. Finally, the photocatalytic reaction mechanism was also studied by free radical capture experiments and electron paramagnetic resonance spectroscopy .
研究领域:
环境化学
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材料科学
·
光催化
·
纳米材料
·
环境污染治理
·
药物降解
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Bin Xu,Tao Ding,Yongcai Zhang,Yaoting Wen,Zhanjun Yang,Ming Zhang
This communication reports the development of a new efficient visible-light-driven composite photocatalyst comprising ZnFe 2 O 4 nanoparticles and conjugated polymer (CPVC) from the dehydrochlorination of polyvinyl chloride (PVC). ZnFe 2 O 4 /CPVC nanocomposites were synthesized via three main steps: (i) the synthesis of ZnFe 2 O 4 nanoparticles by a sol-gel method; (ii) the adsorption of PVC in tetrahydrofuran solution by ZnFe 2 O 4 nanoparticles to form ZnFe 2 O 4 /PVC nanocomposites; and (iii) the dehydrochlorination of PVC in the ZnFe 2 O 4 /PVC nanocomposites by heating at 150 °C for 2 h. X-ray diffraction, Fourier transform infrared spectroscopy and high-resolution transmission electron microscopy characterization revealed that the as-synthesized product was core/shell structured ZnFe 2 O 4 /CPVC nanocomposites. The photocatalytic results demonstrated that the ZnFe 2 O 4 /CPVC nanocomposites had much higher photocatalytic activity than ZnFe 2 O 4 nanoparticles in the reduction of aqueous Cr(VI) under visible-light (λ>420 nm) irradiation. Thus, ZnFe 2 O 4 /CPVC nanocomposites are promising for use as a new efficient visible-light-driven photocatalyst .
研究领域:
材料科学
·
环境化学
·
纳米技术
·
光催化
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105292
·
IF 5.909
Jie Zhou,Wenyi Cai,Jing Ding,Hui Wan,Guofeng Guan
The appropriate construct of Z-scheme heterostructure composite with high photocatalytic activity has created new opportunities for environmental protection. Herein, graphitic carbon nitride quantum dots/tungsten trioxide (CNQDs/WO 3 ) was firstly fabricated using CNQDs decorated onto the surface of WO 3 nanorod grown along the [110] orientation in hydrothermal environment to construct a Z-scheme heterostructure composite. By various characterization methods, the crystal structure, micro morphology, atomic valence state and surface functional groups of the catalyst were systematically revealed. The results indicated that Z-scheme heterojunctions between CNQDs and WO 3 were successfully constructed. Compared with pure WO 3 , CNQDs/WO 3 exhibited prominent photoreduction performance under visible light irradiation. The optimal 5% CNQDs/WO 3 could reduce almost 100% Cr (VI) under acidic condition with the best photocatalytic activity within 90 min. More than this, 5% CNQDs/WO 3 also displayed excellent stability and recyclability even after five cycles of photoreduction experiments. Based on the free radical quenching experiments, the possible photoreduction reaction mechanism had been proposed in detail. The Z-scheme heterostructure provided the possibility of the generation, rapidly transfer and efficient separation of photogenerated electrons, which were major active species in the Cr (VI) photoreduction process.
研究领域:
环境催化
·
材料化学
·
纳米科技
·
光催化
·
环境污染治理
·
半导体异质结
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Lina Wang,Peiyi Yan,Huairui Chen,Zhuo Li,Shu Jin,Xiaoxiang Xu,Jun Qian
Narrow bandgap semiconductor MgIn 2 S 4 has been readily grown onto In 2 O 3 nanofibers by an in situ growing method. The so-formed MgIn 2 S 4 -In 2 O 3 hybrid nanofibers are characterized by strong visible light absorption and intimate MgIn 2 S 4 /In 2 O 3 heterointerfaces. Under visible light illumination ( λ ≥ 400 nm), the hybrid nanofibers demonstrate an exceptionally high photocatalytic activity for Escherichia coli ( E. coli ) disinfection, outcompeting pristine MgIn 2 S 4 , naked In 2 O 3 nanofibers, and many other photocatalytic systems reported. Specifically, the hybrid nanofibers achieve a 7 log reduction in viable cells for merely 20 min illumination while pristine MgIn 2 S 4 and naked In 2 O 3 nanofibers alone are almost inactive. Further analysis indicates that the hybrid nanofibers essentially form a type-II semiconductor heterojunctions which enable spatial separation of photocarriers. Owing to the intimate heterointerfaces, photocarriers can be promptly separated and accumulated respectively in In 2 O 3 and MgIn 2 S 4 thereby allowing continuous generation of copious reactive species for disinfection. This work signifies the usefulness of heterointerfaces in promoting photocarrier separation and provides a useful strategy to upgrade photocatalytic performance from otherwise almost inactive semiconductors.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 5
·1285-1293
·
IF 8.273
Zheng Mang,Li Qi,Liu Mingyang,Liu Jianan,Zhao Chen,Xiao Xudong,Wang Hongli,Zhou Jing,Zhang Liping,Jiang Baojiang
As an n-type semiconductor, In 2 O 3 is considered a promising photocatalyst for producing amino acids using biomass derivatives as precursors. However, similar to other intrinsic semiconductors, In 2 O 3 suffers from poor charge dynamics. Herein, we show the synthesis of Mo-doped In 2 O 3 (Mo-In 2 O 3 ) with a porous rod-shaped structure through a one-step solvothermal reaction followed by calcination. Under visible-light irradiation, Mo-In 2 O 3 achieves a high conversion rate of 81% for the reaction that transforms lactic acid into alanine with a selectivity of 91%. Spectroscopic techniques and density functional theory calculations reveal that Mo doping introduces defect states slightly below the conduction band of In 2 O 3 , which improves the separation of photogenerated electron-hole pairs. In addition, Mo atoms on the surface form extra adsorption and reaction centers that greatly enhance the reaction rate. This work provides insights into the development of transition metal-doped semiconductor photocatalysts to produce amino acids.
研究领域:
材料科学
·
光催化
·
半导体材料
·
生物基化学品
·
分子催化
·
纳米材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shufang Chang,Yiwen Hu,Jun Qian,Yinlin Shao,Shuang Ni,Lulu Kong,Wenyan Dan,Chun Luo,Shu Jin,Xiaoxiang Xu
Nitrogen doped Mg 2 TiO 4 spinel, i.e. Mg 2 TiO 4−x N y , has been synthesized and investigated as a photocatalyst for antibacterial activity. Mg 2 TiO 4−x N y demonstrates superior photocatalytic activity for E. coli disinfection under visible light illumination (λ ≥ 400 nm). Complete disinfection of E. coli at a bacterial cell density of 1.0 × 10 7 CFU mL −1 can be achieved within merely 60 min. Mg 2 TiO 4−x N y is capable of generating superoxide radicals ( O 2 − ) under visible light illumination which are the reactive oxygen species (ROSs) for bacteria disinfection. DFT calculations have verified the importance of nitrogen dopants in improving the visible light sensitivity of Mg 2 TiO 4−x N y . The facile synthesis, low cost, good biocompatibility and high disinfection activity of Mg 2 TiO 4−x N y warrant promising applications in the field of water purification and antibacterial products.
研究领域:
材料科学
·
环境科学
·
微生物学
·
光催化
·
纳米医学
·
生物材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Zhaocheng Zhang,Dongyang He,Haiyang Liu,Miao Ren,Yanan Zhang,Jiao Qu,Nan Lu,Jiunian Guan,Xing Yuan
Black phosphorus (BP), a superior two-dimensional (2D) semiconductor, has attracted much attention due to its unique properties. The graphene (GR)-BP hybrid was synthesized through one pot chemical vapor transport (CVT) approach. The characterization results indicated that P atom was successfully incorporated into GR by the formation of P-C bond. Remarkably, the newly-synthesized GR-BP represented high photocatalytic activity towards 2-chlorophenol (2-CP) degradation, due to the high efficiency of charge separation and transformation caused by the direct band gap of BP and carrier mobility of GR. The removal efficiency for 2-CP reached up to 87.08% within visible light irradiation for 180 min ( λ > 420 nm). The degradation rate of GR-BP hybrid for 2-CP was approximately 7.29-fold than that of BP within 30 min. In addition, the little increasing of the peak for P-O bond in GR-BP hybrid was observed after being exposed in air for 15 days, meant that the stability of BP was significantly enhanced. It was caused by the decreasing of the oxidation sites in BP due to the formation of P-C bond in hybrid. In brief, our synthetic method for GR-BP not only provides a novel route for the improvement of the stability of BP, but also constitutes an insight into the promising practical application of BP in the photocatalysis field.
研究领域:
材料科学
·
纳米科技
·
光催化
·
半导体材料
·
环境化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2010
·Vol. 257
·期 9
·3920-3923
·
IF 1.616
Hongxu Guo,Jianhua Chen,Wen Weng,Shunxing Li
A visible light-driven photocatalyst, C-doped Zn 3 (OH) 2 V 2 O 7 , prepared by a hydrothermal method was studied. The as-prepared catalyst was characterized by SEM, XRD , DRS, and XPS , and exhibited efficient photocatalytic activity in the degradation of methylene blue (MB) under visible-light irradiation. Besides decoloring, the decomposition of MB was also observed, further demonstrating the performance of the photocatalyst. The carbon existing on the surface of Zn 3 (OH) 2 V 2 O 7 nanorods was free and in carbide form. Dye degradation followed first-order kinetics, and was explained on the basis of the Langmuir–Hinshelwood mechanism.
研究领域:
材料化学
·
光催化
·
纳米材料
·
环境化学
·
无机合成
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2011
·Vol. 23
·期 1
·29-32
·
IF 0.775
Wen Hui Zhong,Ying Na Cui,Shen Min Li,Ying Ping Jia,Jing Mei Yin
The carbonylation of phenyl bromide catalyzed by Co(OAc) 2 has been investigated with PhCOPh as a sensitizer under visible light in the presence of basic additive. With strong base CH 3 ONa, PhCOOCH 3 is produced in 70% yield with 100% selectivity , the similar results are also obtained with a stronger base (CH 3 ) 3 CONa. However, with another strong base NaOH, the yield of the ester is only 40%. On the other hand, with weak base NaOAc or ( n -C 4 H 9 ) 3 N, phenyl bromide cannot be carbonylated. The results of carbonylation of the six substituted phenyl bromides suggest that the activities of o , m , p -BrC 6 H 4 CH 3 are similar to phenyl bromide, while the activities of o , m , p -BrC 6 H 4 Cl are higher with the high yields (≥93%) of the corresponding chloro-esters. In addition, the relative position of bromine and chlorine or methyl on phenyl ring has little effect on the activity of the carbonylation .
研究领域:
有机化学
·
光催化
·
均相催化
·
反应机理
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2016
·
IF 3.958
Lei Zhao,Baoyue Zhang,Xin Xiao,Feng Long Gu,Rui-Qin Zhang
Active species such as holes, electrons, hydroxyl radicals ( OH), and superoxide radical anions ( O 2 − ) involved in the photocatalytic oxidation of benzyl alcohol (BA) into benzaldehyde (BAD) on TiO 2 under ultraviolet (UV) light were investigated by adding corresponding scavengers. The experimental results show that the oxidation of BA into BAD is driven mainly by the holes and OH radical. The role of dissolved O 2 was studied by bubbling N 2 through the reaction. The results show that the dissolved O 2 is, to some extent, the source of OH. Additional density functional theory (DFT) calculations identified two H-abstraction pathways ( R abs OH and R abs α). The structure of the R abs OH product is less stable and tends to transfer resulting in the R abs α product. The holes are the main driving force for the abstracting of H from BA. The OH radical combines with the H-abstract product to form a precursor of product BAD, detected by LC–MS technique ( m / z 123), which then undergoes an intramolecular dehydration reaction to form BAD. The results will help to select the optimal active species for the photocatalytic oxidation of BA into BAD on TiO 2 under UV light.
研究领域:
物理化学
·
光催化
·
环境化学
·
材料化学
·
理论计算化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）