JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Kainan Song,Feng Xiao,Lijuan Zhang,Fan Yue,Xiaoyu Liang,Jide Wang,Xintai Su
A hybrid nanomaterial comprising of one-dimensional W 18 O 49 nanowires grown on two-dimensional g-C 3 N 4 sheets was prepared by a facile solvothermal process. Photocatalytic activity of these materials for H 2 generation under visible light was evaluated. The optimum efficiency of W 18 O 49 /g-C 3 N 4 composite photocatalyst at a mass content of 30% was up to 4.5 times as high as that of the pure g-C 3 N 4 . The significantly enhanced performance of W 18 O 49 /g-C 3 N 4 composites was mainly attributed to the synergistic effect between the interface of W 18 O 49 nanowires and g-C 3 N 4 sheets, involving stronger light absorption in the visible range, faster transfer and more efficient separation of the photo-generated electron-hole pairs. In short, the W 18 O 49 /g-C 3 N 4 hybrid nanomaterial was demonstrated to be an effective photocatalyst for H 2 production.
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RSC Advances
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2016
·Vol. 6
·期 42
·35216-35227
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IF 3.289
Minmin Liu,Li-an Hou,Qi Li,Xiaojun Hu,Shuili Yu
Magnetic catalysts (Ag/AgCl/(x)FeX) were fabricated via a facile hydrothermal method followed by a precipitation–photo-reduction method. The Ag/AgCl/(x)FeX catalysts were applied to activate persulfate (PS) for tetracycline (TC) degradation. The degradation efficiencies of the Ag/AgCl/(x)FeX–PS system for TC removal were high due to the enhanced adsorptive capacity of (x)FeX, extended absorbance in the visible-light region and improved space separation of photo-induced charge carriers. The Ag/AgCl/(0.05)FeX catalyst exhibited better performance for TC removal compared with the other samples and complete degradation of TC could be achieved in 120 min by using 1 g L−1 Ag/AgCl/(0.05)FeX and 5.0 mM PS at pH 3.5. The characterization of the catalysts and Electron Paramagnetic Resonance (EPR) studies indicated that TC was mainly degraded by surface-adsorbed radicals resulting from the reaction between PS and Fe(II) on the catalysts under visible light. The Ag/AgCl/(x)FeX–PS system provides new insights for contaminant removal from water.
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MATERIALS & DESIGN
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2017
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IF 4.364
Xiao Du,Jun Wan,Jia Jia,Chao Pan,Xiaoyun Hu,Jun Fan,Enzhou Liu
Ag 3 PO 4 -Bi 2 MoO 6 heterojunctions with visible-light photocatalytic activity were successfully fabricated via a deposition-precipitation method. The investigation shows that Ag 3 PO 4 -Bi 2 MoO 6 composites exhibit enhanced visible light harvesting ability and better degradation efficiency for RhB compared with Bi 2 MoO 6 and Ag 3 PO 4 under visible light irradiation (λ > 420 nm). What's more, we found that the activity and the stability of Ag 3 PO 4 -Bi 2 MoO 6 heterojunction could be further improved by adding of H 2 O 2 in the RhB reaction solution. The enhanced photocatalytic performance and structure stability are primarily attributed to the efficient charge carrier separation of the heterojunction formed by Ag 3 PO 4 and Bi 2 MoO 6 , and the electron capturing property of H 2 O 2 on the surface of Ag 3 PO 4 -Bi 2 MoO 6 composites, leading to a highly efficient removal of RhB using the Ag 3 PO 4 -Bi 2 MoO 6 -H 2 O 2 system. In addition, the active species trapping experiments indicate that h + and •O 2 – play important roles during the photocatalytic degradation process . This work suggests that the H 2 O 2 assisted Ag 3 PO 4 -Bi 2 MoO 6 heterojunction system could be a potential promising photocatalyst for environmental remediation.
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RSC Advances
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2017
·Vol. 7
·期 4
·2333-2341
·
IF 3.108
Yanfang Yang,Jingjing Chen,Zhiyong Mao,Na An,Dajian Wang,Bradley D. Fahlman
Ultrathin graphitic carbon nitride (g-C3N4) nanosheets were synthesized via thermal exfoliation of bulk urea-derived g-C3N4 under an argon atmosphere. As a visible-light responsive photocatalyst, this material exhibits a much superior photocatalytic activity in pollution degradation and H2 evolution than bulk g-C3N4, as a result of the extended region of visible light response and the enhanced surface area of ultrathin g-C3N4 nanosheets. These findings may provide a promising and facile approach to the design of high-performance photocatalysts.
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CARBOHYDRATE POLYMERS
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2017
·
IF 4.811
Qiyang Wang,Jinhua Guo,Yixiang Wang,Lingyun Chen,Jie Cai,Lina Zhang
In this study cellulose hydrogels with lanthanide ions nanoparticles embedded in were prepared via in situ doping using a low-temperature alkali hydroxide/urea aqueous solution as a cellulose solvent. Depending on the type and relative concentrations of the constituent lanthanide ions, the color of light emission were modulated to generate the three primary colors and other adjusted colors by blending red, green and blue at certain ratios. This work has opened new and convenient pathway to create regulated fluorescent cellulose hydrogels for potential applications in the fields of bioimaging and fluoroimmunoassay.
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ACS Nano
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2016
·
IF 13.334
Min Chen,Jiajun Gu,Cheng Sun,Yixin Zhao,Ruoxi Zhang,Xinyuan You,Qinglei Liu,Wang Zhang,Yishi Su,Huilan Su,Di Zhang
Photoelectric conversion driven by sunlight has a broad range of energy/environmental applications (e.g., in solar cells and water splitting). However, difficulties are encountered in the separation of photoexcited charges. Here, we realize a long-range (∼1.5 μm period) electric polarization via asymmetric localization of surface plasmons on a three-dimensional silver structure (3D-Ag). This visible-light-responsive effect—the photo-Dember effect, can be analogous to the thermoelectric effect, in which hot carriers are thermally generated instead of being photogenerated. The induced electric field can efficiently separate photogenerated charges, enabling sunlight-driven overall water splitting on a series of dopant-free commercial semiconductor particles (i.e., ZnO, CeO2, TiO2, and WO3) once they are combined with the 3D-Ag substrate. These photocatalytic processes can last over 30 h on 3D-Ag+ZnO, 3D-Ag+CeO2, and 3D-Ag+TiO2, thus demonstrating good catalytic stability for these systems. Using commercial WO3 powder as a reference, the amount of O2 generated with 3D-Ag+CeO2 surpasses even its recently reported counterpart in which sacrificial reagents had to be involved to run half-reactions. This plasmon-mediated charge separation strategy provides an effective way to improve the efficiency of photoelectric energy conversion, which can be useful in photovoltaics and photocatalysis.
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RENEWABLE ENERGY
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2017
·
IF 4.357
Rongshu Zhu,Fei Tian,Sainan Che,Gang Cao,Feng Ouyang
A series of RGO/La-ZnIn 2 S 4 photocatalysts were successfully synthesized using the hydrothermal method with different amount of RGO (0 wt%, 0.1 wt%, 0.5 wt%, 1.0 wt%, 2.0 wt%, 5.0 wt%) and La (0 wt%, 0.1 wt%, 0.5 wt%, 1.0 wt%, 2.0 wt%, 5.0 wt%) and characterized by various analysis techniques, such as XRD , Raman, SEM, UV–Vis, TEM, BET and PL. The photocatalytic H 2 evolution activities have also been evaluated under visible-light irradiation. The H 2 production activity of RGO/La-ZnIn 2 S 4 was influenced by both La and RGO significantly. The activity reached the best when the amounts of La and RGO were both 1.0 wt%. The hydrogen production rate of 1.0Pt/1.0RGO/1.0La-ZnIn 2 S 4 was 2255 μmol g −1 h −1 and the apparent quantum yield and the energy conversion efficiency were 29.45% and 18.79% at 420 nm respectively. The activity was related to the BET surface area, the pore microstructure and the synergistic effect of RGO and La. On the basis of the characterization of the catalysts, the synergistic effect of RGO and La on the photocatalytic activity of RGO/La-ZnIn 2 S 4 was discussed in detail.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Qingzhi Luo,Xiaolian Yang,Xiaoxiao Zhao,Desong Wang,Rong Yin,Xueyan Li,Jing An
Well-dispersed zinc oxide/cyclized polyacrylonitrile (ZnO/CPAN) nanocomposites were prepared by a facile in-situ precipitation method. The mixture solution of dimethyl sulfoxide containing zinc nitrate and polyacrylonitrile (PAN) was added dropwise into ammonia water under vigorous magnetic stirring. Accompanied by the precipitation of PAN in water, zinc hydroxide were simultaneously formed via in-situ reaction of zinc nitrate with hydroxyl ions, leading to the uniform dispersion of zinc hydroxide nanoparticles in the precursor of ZnO/PAN nanocomposites. Then ZnO/CPAN nanocomposites were prepared by calcining the obtained precursor at 250 °C in nitrogen atmosphere via cyclization/dehydrogenation reaction of PAN and decomposition reaction of Zn(OH) 2 . The as-prepared ZnO/CPAN nanocomposites were characterized by XRD, SEM, XPS, UV–vis DRS, PL, etc. Results show that CPAN molecules in ZnO/CPAN nanocomposites significantly decrease the mean size of ZnO nanocrystals, increase the quantity of oxygen defects in ZnO particles, improve the absorbance of ZnO in the whole wavelength range especially in the visible-light range, and obviously reduce the recombination probability of photo-generated electron/hole pairs. The photocatalytic activity of ZnO/CPAN nanocomposites was evaluated by photodegradation of methyl orange (MO) solution under visible light irradiation. Experiment results reveal that the apparent rate constant k of MO photodegradation under visible light irradiation photocatalyzed by ZnO/CPAN (0.361 h −1 ) is 1.28, 5.84 and 25.8 times of that by AgBr (0.282 h −1 ), Ag 3 PO 4 (0.0618 h −1 ) or g–C 3 N 4 (0.0140 h −1 ), respectively, meaning that ZnO/CPAN exhibits much higher visible-light photocatalytic activity than these typical visible-light photocatalysts. The visible-light photocatalytic mechanism has been discussed.
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CHEMISTRY-A EUROPEAN JOURNAL
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2016
·Vol. 22
·期 34
·12160-12165
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IF 5.771
Fang Chen,Zhaohui Ren,Siyu Gong,Xiang Li,Ge Shen,Gaorong Han
Graphical Pick a side : Ag 2 O was selectively deposited on the positive polar surface of ferroelectric PbTiO 3 (PTO) nanoplates by a photochemical reaction. Formation of Ag 2 O is attributed to the oxidation of freshly formed silver nanoparticles by oxygen during visible-light irradiation. The composite shows efficient photocatalytic performance, which may be caused by the ferroelectric polarization effect of the PTO nanoplate. In this work, single-crystal and single-domain PbTiO 3 nanoplates are employed as substrates to prepare Ag 2 O/PbTiO 3 composite materials through a photodeposition method. It is revealed that silver oxide nanocrystals with an average size of 63 nm are selectively deposited on the positive polar surface of the ferroelectric substrate. The possible mechanism leading to the formation of silver oxide is that silver ions are first reduced to silver and then oxidized by oxygen generation. The composite shows an efficient photodegradation performance towards rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. Such highly efficient photoactivity can be attributed to the ferroelectric polarization effect of the substrate, which promotes the separation of photogenerated electrons and holes at the interface.
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APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Fengyu Tian,Dongfang Hou,Fuchao Hu,Kui Xie,Xiuqing Qiao,Dongsheng Li
1D porous CdS nanoparticles/TiO 2 nanofibers heterostructure has been fabricated via simple electrospinning and a successive ionic layer adsorption and reaction (SILAR) process. The morphology, composition, and optical properties of the resulting CdS/TiO 2 heterostructures can be rationally tailored through changing the SILAR cycles. The photocatalytic hydrogen evolution and decomposition of rhodamine B (RhB) of the as-synthesized heterostructured photocatalysts were investigated under visible light irradiation. Compared to TiO 2 nanofibers，the as-obtained CdS/TiO 2 heterostructures exhibit enhanced photocatalytic activity for hydrogen production and decomposition of RhB under visible-light irradiation. The heterojunction system performs best with H 2 generation rates of 678.61 μmol h −1 g −1 under visible light irradiation which benefits from the two effects: (a) the 1D porous nanofibrous morphology contributes to not only more active sites but also more efficient transfer of the photogenerated charges (b) the synergetic effect of heterojunction and photosensitization reducing the recombination of photogenerated electrons and holes.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Zhuo Chen,Zhuoyu Liu,Gebin Shen,Ruiheng Wen,Jie Lv,Jizhen Huo,Yingfeng Yu
Cycloaliphatic epoxy resin (3–4-epoxycyclohexane) methyl 3–4-epoxycyclohexyl-carboxylate (ECC) was formulated with flexible hydrogenated bisphenol A diglycidyl ether (HBADGE) to inspect the influence of chain flexibility on the performance and reliability of epoxy packaged Light-emitting Diode (LED). The properties of epoxy encapsulants were characterized by using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetric analyses (TGA), ultraviolet visible (UV–vis) spectrophotometer, thermomechanical analyzer (TMA), scanning acoustic microscopy (SAM), and scanning electron microscopy (SEM). With the incorporation of flexible HBADGE, favorable properties were obtained, such as decreased thermal expansion coefficient (CTE), lowered storage modulus at reflow temperature, and depressed equilibrium water uptake for the epoxy packaging materials. The light transmittance of encapsulants differed after thermal and UV aging. Compared with Neat ECC and Neat HBADGE, the HBADGE-modified encapsulants endowed LED devices with good performance and high reliability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Kun-Le Jia,Jin Qu,Shu-Meng Hao,Fei An,Ya-Qiong Jing,Zhong-Zhen Yu
Construction of a heterostructure to prolong the life of electron-hole pairs is a very important approach to endow it with excellent photodegradation performances. Particularly, one-pot synthesis of heterostructures with the same component but different crystal structures to form a proper band gap is still challenging. Herein, bismuth silicate (BSO) heterostructures are synthesized using a one-pot hydrothermal approach without adding any other inorganic components. The crystal phase, morphology, surface state, and photochemical properties of the BSO materials are precisely tuned to fabricate two kinds of bismuth silicate heterostructures: rod-like Bi 2 SiO 5 /Bi 12 SiO 20 and flower-like Bi 2 SiO 5 /Bi 4 Si 3 O 12 heterostructures. Thanks to the two heterostructures and clean surface, the optimized BSO material exhibits a highly active photocatalytic performance with a remarkable cycling stability. It photodegrades Rhodamine B under visible light irradiation as fast as 15 min with the reaction rate constants k and k s to be 0.399 min −1 and 0.698 min −1 L m −2 , respectively, which is up to 189 times faster than reported.
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