MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Zhilin Li,Chongyue Jin,Chunmei Lv,Min Wang,Jin Kang,Shiyu Liu,Yuanhua Xie,Tong zhu
To further promote the visible-light photocatalytic efficiency of Bi 24 O 31 Cl 10 , g-C 3 N 4 /Eu(III) doped Bi 24 O 31 Cl 10 heterojunction composites (CN/Eu-BCO) were successfully synthesized via modified solution combustion and immersion-calcination method. The effects of Eu(III) dopants and g-C 3 N 4 coupling on the micro-structures and the photocatalytic efficiency of Bi 24 O 31 Cl 10 towards Rhodamine B (RhB) degradation were investigated in detail. The results displayed that Eu(III) doping and coupling with g-C 3 N 4 can largely promote the photocatalytic efficiency of Bi 24 O 31 Cl 10 . The photodegradation rate of RhB over 5CN/0.01Eu-BCO can reach to be 91.9% in 40 min, which was 8.46 folds of Bi 24 O 31 Cl 10 , 1.91 folds of 0.01Eu-BCO, and 1.72 folds of 5CN/BCO. The main radical species being responsible for RhB degradation were ● O 2 − and ● OH. Furthermore, 5CN/0.01Eu-BCO composite photocatalyst exhibited good reusability and stability.
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Materials Research Express
·
2018
·Vol. 5
·期 6
·065906
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IF 1.151
Dong Mao,Lishan Zhu,Xiaofeng Fei,Xinyu Zheng,Dong Fang
The fabrication of indium sulfide/graphene oxide composites (In2S3@GO) via a novel hydrothermal method was reported. The morphology of the composites showed that the daisy-like In2S3 structures were dispersed evenly on GO with large specific surface area. The photocatalytic performance of In2S3@GO was evaluated through photodegradation Rhodamine B. In2S3@GO exhibits higher photodegradation performance than that of pure In2S3. In addition, the composites showed great adsorption-desorption ability and stability. The solution pH value also has a significant influence on photocatalytic activity of In2S3@GO. This work may provide new insights to construct carbon-based semiconductor photocatalyst for organic dye pollution degradation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Qun-Zeng Huang,Ze-Juan Tao,Li-Qun Ye,Hong-Chang Yao,Zhong-Jun Li
Development of highly efficient and low-cost noble metal-free co-catalysts for photocatalytic H 2 evolution from water splitting has been aiming at a long-term goal of a renewable hydrogen economy. Herein, a series of novel Mn 0.2 Cd 0.8 S/CoP 3 composites have been successfully prepared through loading CoP 3 nanoparticles on the surface of one dimensional (1D) Mn 0.2 Cd 0.8 S nanowires (NWs) by a facile solvothermal method. Under visible light (λ ≥ 420 nm) irradiation, the as-prepared Mn 0.2 Cd 0.8 S/CoP 3 composite with 2.87 wt% of CoP 3 displayed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 29.53 mmol g −1 h −1 and an apparent quantum yield of 29.2% at 420 nm, which was about 5.02 times higher than that of pure Mn 0.2 Cd 0.8 S and 1.79 times than that of Mn 0.2 Cd 0.8 S/Pt-1.5 wt%. Moreover, the Mn 0.2 Cd 0.8 S/CoP 3 composite exhibited excellent photostability. The superior photocatalytic activity of Mn 0.2 Cd 0.8 S/CoP 3 composite was predominantly attributed to the synergistic effects of highly efficient charge separation efficiency and sufficient active sites for H 2 evolution reaction. This work revealed that low-cost CoP 3 can replace noble metal Pt as a highly efficient co-catalyst for enhancing the photocatalytic activity of semiconductor materials.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Weixuan Zeng,Yuan Bian,Sheng Cao,Yongjin Ma,Yi Liu,Anquan Zhu,Pengfei Tan,Jun Pan
Tantalum oxynitride-based materials, which possess narrow band gaps and sufficient band energy potentials, have been of immense interest for water splitting. However, the efficiency of photocatalytic reactions is still low because of the fast electron–hole recombination. Here, a Sr2Ta2O7–xNx/SrTaO2N heterostructured photocatalyst with a well-matched band structure was in situ constructed by the nitridation of hydrothermal-prepared Sr2Ta2O7 nanosheets. Compared to Sr2Ta2O7–xNx and pure SrTaO2N, the Sr2Ta2O7–xNx/SrTaO2N heterostructured photocatalyst exhibited the highest rate of hydrogen evolution, which is ca. 2.0 and 76.4 times of Sr2Ta2O7–xNx and pure SrTaO2N, respectively, under the similar reaction condition. The enhanced performance arises from the formation of suitable band-matched heterojunction-accelerated charge separation. This work provides a promising strategy for the construction of tantalum oxynitride-based heterojunction photocatalysts.
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CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Weiming Wu,Xiao-Yuan Wu,Can-Zhong Lu
A new nickel substituted silicotungstate ([Ni 4 (H 2 O) 2 (SiW 10 O 38 ) 2 ] 8− , Ni 2 SiW 10 ) was builded by NiCl 2 and Na 10 SiW 9 O 34 under mild conditions. It was used as a carbon-free homogeneous catalyst for the efficient visible-light-induced hydrogen production from water splitting with fluorescein sodium and triethanolamine as a photosensitizer and sacrificial electron donor, respectively. The initial rate of the H 2 evolution was 239 μmol h −1 , corresponding to a turnover frequency of 28 h −1 . Further results suggested that a reductive process was dominant in the present system for fluorescein sodium, and the production of H 2 came from water splitting.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 12
·10453-10460
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IF 2.324
Yuan Rongrong,Liu Jianming,Xiang Weidong,Liang Xiaojuan
Various luminescent carbon materials are artificially synthesized and as admirable fluorescent materials because of the increased research of carbon nanodots (CDs). Herein, a novel solvent-dependent red CDs (rCDs) is introduced through solvothermal method. The as-prepared rCDs remain benzene structure and possess abundant surface function groups that endow them well solubility in various solvents. Furthermore, multicolor luminescence are observed when rCDs are dissolved in different solvents, and the emission wavelength of these materials can be well-tuned from 475 to 624 nm, which presents intensity solvent-dependent properties. Red luminescence carbon phosphors are successfully synthesized by mix rCDs with silica powder. Finally, warm white light emitting diodes (WLEDs) are constructed using rCDs powder with Ce 3+ : YAG single crystal and blue GaN chips. The results demonstrate that the rCDs can act as red component to modify the correlated color temperature (CCT) and the color rendering index (CRI) of WLEDs .
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 18
·12808-12816
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IF 3.906
Zhiyong Li,Xiaoqing Yuan,Ying Feng,Yongkui Chen,Yuling Zhao,Huiyong Wang,Qingli Xu,Jianji Wang
Photo-induced conductivity modulation of stimuli-responsive materials is of great importance from the viewpoint of fundamental research and technology. In this work, 5 new kinds of azobenzene-based photo-responsive ionic liquids were synthesized and characterized, and UV/vis light modulation of their conductivity was investigated in an aqueous solution. The factors affecting the conductivity modulation of the photo-responsive fluids, such as photo-isomerization efficiency, photo-regulation aggregation, concentration and chemical structure of the ionic liquids, were examined systematically. It was found that the conductivity of the ionic liquids in water exhibited a significant increase upon UV light irradiation and the ionic liquids with a shorter alkyl spacer in the cation showed a more remarkable photo-induced conductivity enhancement with a maximum increase of 150%. In addition, the solution conductivity was restored (or very close) to the initial value upon an alternative irradiation with visible light. Thus, the solution conductivity can be modulated using alternative irradiation with UV and visible light. Although the reversible photo-isomerization of the azobenzene group under UV/vis irradiation is the origin of the conductivity modulation, the photo-regulated aggregation of the ionic liquid in water is indispensable for the maximum degree of conductivity modulation because UV irradiation can weaken, even break the aggregated cis-isomers of the ionic liquids in an aqueous solution.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Atian Xie,Jiuyun Cui,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai
To better circumvent the issues of oil spills and industrial organic pollutants, it is urgent and necessary to develop advanced material or technology that can efficiently separate oil/water mixture. Herein, no matter light or heavy oil/water mixtures are separated successfully by a straight tee system combining two opposite superwetting meshes. The combined system shows a high flux (above 0.22 × 10 5 L m −2 h −1 ), high efficiency (above 99.3%) for continuous light or heavy oil/water separation with good durability. Importantly, the superhydrophilic and superhydrophobic meshes can be easily obtained via facile, viable electroless galvanic replacement reaction followed post surface modification strategy. Additionally, the capillary action was used to clarify mechanism of oil/water separation to gain insight into oil/water separation process. The merits of high flux, high efficiency, viable for light/heavy oil and durability make this separation system a powerful tool for practical application in continuous oil/water separation.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 33
·期 3
·e4683
·
IF 3.581
Jiang Li,Xiaolu Zhu,Fengxian Qiu,Tao Zhang,Fengping Hu,Xiaoming Peng
Introducing plasmonic metals into semiconductor materials has been proven to be an attractive strategy for enhancing photocatalytic activity in the visible region. In this work, a novel and efficient Ag/Ag 2 WO 4 /g-C 3 N 4 (AACN) ternary plasmonic photocatalyst was successfully synthesized using a facile one-step in situ hydrothermal method. The composition, structure, morphology and optical absorption properties of AACN were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–visible diffuse reflectance spectroscopy, respectively. Photocatalytic performance of AACN was evaluated via rhodamine B and tetracycline degradation. The results indicated that AACN had excellent photocatalytic performance for rhodamine B degradation with a rate constant of 0.0125 min −1 , which was higher than those of Ag 2 WO 4 and Ag/Ag 2 WO 4 . Characterization and photocatalytic tests showed that the strong coupling effect between the Ag/Ag 2 WO 4 nanoparticles and the exfoliated ultrathin g-C 3 N 4 nanosheets was superior for visible-light responsivity and reduced the recombination rate of photogenerated electrons and holes. A proposed mechanism is also discussed according to the band energy structure and the experimental results.
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DALTON TRANSACTIONS
·
2018
·Vol. 48
·期 3
·1067-1074
·
IF 4.099
Feifei Mei,Jinfeng Zhang,Kai Dai,Guangping Zhu,Changhao Liang
Recently, cadmium selenide (CdSe) has been deeply studied because of its excellent photocatalytic hydrogen (H2) production performance. However, pure CdSe has poor stability and severe photocorrosion, which seriously affect its application prospect. In this work, we successfully deposit Bi2MoO6 on an inorganic–organic CdSe-diethylenetriamine (DETA) hybrid to design Bi2MoO6/CdSe-DETA composites by an in situ solvothermal method. The morphology, crystal structure, electrochemical properties, H2 evolution performance and the photostability of Bi2MoO6/CdSe-DETA composites are explored using various techniques. The results show that the as-prepared Bi2MoO6/CdSe-DETA composites exhibit excellent photocatalytic performance and photostability under visible light irradiation. Among them, the Bi2MoO6/CdSe-DETA hybrid system exhibits excellent photocatalytic H2 production performance (5.92 mmol g−1 h−1), which is approximately 3.6 and 1.8 times higher than that of pure CdSe and CdSe-DETA, respectively. After 4 cycles, the photocatalyst still maintains high H2 production. This study develops a new type of photocatalyst that can respond to visible light. This provides an effective way to solve the energy problem by using solar energy.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Xiaoyang Wang,Xu Yang,Lei Miao,Jie Gao,Liangpeng Wu,Nan Wang,Xinjun Li
Exploring and developing novel semiconductor photo-catalysts for visible-light-driven water splitting are of great scientific significance to solve energy and environmental problems. Herein, Bismuth Selenide (Bi 2 Se 3 ) nanosheets decorated with a thin layer of Bi 2 SeO 2 to form Bi 2 Se 3 /Bi 2 SeO 2 nanocomposites were successfully prepared using a conventional reflux and heating method. Fabricated Bi 2 Se 3 /Bi 2 SeO 2 heterojunctions were characterized via X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. It has revealed that, the thickness of outer Bi 2 SeO 2 layer can be tuned upon the annealing temperatures, which strongly influenced the performance of catalyst towards water splitting performances. Annealed at 200 °C, the Bi 2 Se 3 /Bi 2 SeO 2 heterojunction with ∼5 nm of Bi 2 SeO 2 layer yielded the highest hydrogen production rate of 136 μmol g −1 h −1 . This enhanced photo-catalytic activity was ascribed to the synergy effect between the Bi 2 Se 3 /Bi 2 SeO 2 layer, increased the visible light absorbance capacity, adjustment of the band gap and accelerate the electron-hole separation efficiency. The results represent a simply solution-based method towards a material with high photo-catalytic performance through the appropriate regulation of the oxidation degree of Bi 2 Se 3 nanosheets, promising their industrial applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Wei Chen,Yinzi Cheng,Linli Shen,Chenyang Shen,Xiaojuan Liang,Weidong Xiang
To achieve efficient phosphors that address the shortage of red emission for use in white light emitting diodes (WLED), a series of red-emitting phosphors of Sr 2 MgGe 2 O 7 doped with different concentrations of Mn 4+ have been successfully fabricated by a high-temperature solid-state method. The crystal structure properties including the phase purity were analysed by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Absolute quantum yield, temperature stability, and lifetime were utilized to characterize the samples. Furthermore, the excitation spectra of the samples exhibit two broad absorption bands with peaks located at approximately 308 nm and 419 nm, which could be excited by near-UV/blue LED light. The emission spectra range from 600 nm to 700 nm and exhibited a sharp peak at 659 nm due to the 4 E→ 4 A 2 spin- and parity-forbidden transition of Mn 4+ . The optimal Mn 4+ doping concentration in the Sr 2 MgGe 2 O 7 host is determined to be 0.7%. The critical energy transfer distance of these phosphors is calculated to be about 26.61 Å, and the concentration quenching mechanism is proved to correspond to a dipole-dipole interaction. The luminescence of the Sr 2 MgGe 2 O 7 :Mn 4+ phosphors decrease gradually with increasing temperature, and the Sr 2 MgGe 2 O 7 :Mn 4+ sample exhibits better thermal stability than the commercial Sr 2 Si 5 N 8 :Eu 2+ red phosphors. The warm WLED is fabricated by combining the Sr 2 MgGe 2 O 7 :0.7%Mn 4+ and YAG:Ce 3+ phosphor with a 420-nm blue LED chip to explore its possible applications in warm WLED.
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