ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Aimin Chen,Rui Liu,Xiao Peng,Qiaofen Chen,Jianmin Wu
In order to distinguish NO2 and SO2 gas with one sensor, we designed a paper chip assembled with a 2D g-C3N4/rGO stacking hybrid fabricated via a layer-by-layer self-assembly approach. The g-C3N4/rGO hybrid exhibited a remarkable photoelectric property due to the construction of a van der Waals heterostructure. For the first time, we have been able to selectively detect NO2 and SO2 gas using a “light on and off” strategy. Under the “light off” condition, the g-C3N4/rGO sensor exhibited a p-type semiconducting behavior with a low detection limit of 100 ppb of NO2, but with no response toward SO2. In contrast, the sensor showed n-type semiconducting behavior which could detect SO2 at concentration as low as 2 ppm under UV light irradiation. The effective electron transfer among the 2D structure of g-C3N4 and rGO nanosheets as well as highly porous structures could play an important role in gas sensing. The different sensing mechanisms at “light on and off” circumstances were also investigated in detail.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
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IF 2.625
Qin Chen,Huijie Hou,Danwei Zhang,Shaogang Hu,Tao Min,Bingchuan Liu,Changzhu Yang,Wenhong Pu,Jingping Hu,Jiakuan Yang
The ZnO/g-C 3 N 4 photocatalyst was prepared by ball milling and demonstrated enhanced photocatalytic degradation of RhB under visible light irradiation. The photocatalyst is consisted of ZnO and g-C 3 N 4 heterojunctions formed by the shear stress during the mechanical treatment. The addition of g-C 3 N 4 can improve the photocatalytic performance of ZnO under visible light. The heterojunction formed between ZnO and g-C 3 N 4 decreased the recombination rate of photogenerated carriers and improved the photocatalytic activity of the ZnO/g-C 3 N 4 hybrids. The optimal ZnO/g-C 3 N 4 photocatalyst with 10 wt% g-C 3 N 4 showed a degradation efficiency of 51.3% for RhB under visible light, which is 2.1 times higher than that of pristine ZnO. The electron paramagnetic resonance (EPR) measurement showed that the OH radicals are the dominant active species in photocatalytic process under both full solar spectrum and visible light irradiation. And the OH radical generation is much more efficient under full solar spectrum than that under visible light due to the UV response of ZnO. This work provides a simple method for the design and preparation of novel heterojunction photocatalysts.
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RENEWABLE ENERGY
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2017
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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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Polymer Chemistry
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2016
·Vol. 7
·期 25
·4226-4236
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IF 5.687
Wenchao Ma,Dong Chen,Yuhong Ma,Li Wang,Changwen Zhao,Wantai Yang
With ethyl-α-bromophenylacetate (EBPA) as an initiator and Cu(dap)2Cl (dap = 2,9-bis(p-anisyl)-1,10-phenanthroline) as a photoredox catalyst, controlled radical polymerizations of poly(ethylene glycol)methyl ether methacrylate (PEGMA) and methyl methacrylate (MMA) are demonstrated under LED light lamp irradiation (4500 μW cm−2@420 nm). The catalysis cycles proceed in the presence of N,N-dimethylaniline (DMA) or tris[2-(dimethylamino)ethyl]amine (Me6TREN), which could serve as reductants to regenerate a Cu(I) complex from the oxidized Cu(II) complex. In addition, Me6TREN plays another important role as an efficient ligand for the copper-based photopolymerization of methacrylate monomers. Good linear evolution of molecular weight (Mn) with monomer conversion is observed under the optimized conditions. Specifically, with [PEGMA] : [EBPA] : [Cu(dap)2Cl] : [Me6TREN] = 31 : 1 : 0.015 : (0.15–0.45), poly(PEGMA) (PPEGMA) with polydispersity indexes (PDI) as low as 1.15 are obtained. To further verify the living nature of this system, block copolymers of PPEGMA-b-PMMA with high molecular weights and narrow molecular weight distributions (Mn,GPC = 59 200 g mol−1, PDI = 1.28 and Mn,GPC = 93 700 g mol−1, PDI = 1.44, respectively) are prepared using PPEGMA-Br (Mn,GPC = 11 600 g mol−1; PDI = 1.13) as a macroinitiator. The polymers produced with Cu(dap)2Cl/Me6TREN as a catalyst and the PMMA obtained with Cu(dap)2Cl/DMA as a catalyst are colorless which is different from the heterogeneously catalyzed ATRP for its notorious Cu metal residue.
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RSC Advances
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2017
·Vol. 7
·期 81
·51046-51054
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IF 3.108
Jing Wu,Jian Li,Jin Liu,Jin Bai,Lina Yang
A novel Nb2O5/Bi2WO6 heterojunction catalyst was successfully synthesized via a one-pot solvothermal process. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with the corresponding XEDS energy mapping, UV-vis diffuse reflection spectra (UV-vis DRS), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic oxidative desulfurization performances of the prepared samples were studied with DBT as the model sulfur compound under visible light irradiation. Results indicated that the Nb2O5/Bi2WO6 exhibited considerably higher activity than pure Nb2O5 and Bi2WO6 and the desulfurization rate achieved 99% after visible light irradiation for 120 min. The catalyst also possessed good stability so that the desulfurization rate remained about 90% after seven cycle times and then the crystal structure of the catalyst has barely changed. Such enhanced photocatalytic activity is mainly attributed to the effective separation of photogenerated electron–hole pairs on Nb2O5/Bi2WO6 heterojunction. Moreover, the synergistic effects of this photocatalytic oxidation and the extraction with the methanol as the solvent played an indispensable role in the desulfurization.
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ACS Catalysis
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2016
·
IF 9.307
Nengchao Luo,Min Wang,Hongji Li,Jian Zhang,Huifang Liu,Feng Wang
One of the challenges of depolymerizing lignin to valuable aromatics lies in the selective cleavage of the abundant C–O bonds of β-O-4 linkages. Herein we report a photocatalytic oxidation–hydrogenolysis tandem method for cleaving C–O bonds of β-O-4 alcohols. The Pd/ZnIn2S4 catalyst is used in the aerobic oxidation of α-C–OH of β-O-4 alcohols to α-C═O with 455 nm light, and then a TiO2–NaOAc system is employed for cleaving C–O bonds neighboring the α-C═O bonds through a hydrogenolysis reaction by switching to 365 nm light. Interestingly, the oxidation–hydrogenolysis tandem reaction can be conducted in one pot to offer ketones and phenols (up to 90% selectivity) via a dual light wavelength switching (DLWS) strategy. EPR and metal loading experiments elucidate that Ti3+ in TiO2 is formed in situ and is responsible for the photocatalytic hydrogenolysis through electron transfer from Ti3+ to the β-O-4 ketones.
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
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2017
·Vol. 93
·期 5
·1154-1164
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IF 2.121
Fengjun Zhang,Shuang Zou,Tianye Wang,Yuxi Shi,Peng Liu
CeO 2 /Bi 2 WO 6 heterostructured microsphere with excellent and stable photocatalytic activity for degradation tetracyclines was successfully synthesized via a facile solvothermal route. The photocatalytic experiments indicated that CeO 2 /Bi 2 WO 6 heterostructured microspheres exhibited enhanced photocatalytic activity compared to pure Bi 2 WO 6 in both the degradation of tetracycline hydrochloride (TCH) and rhodamine B (RhB) under visible-light irradiation. The 1CeO 2 /2Bi 2 WO 6 exhibited the best photocatalytic activity for degradation of TCH, reaching 91% after 60 min reaction. The results suggested that the particular morphological conformation of the microspheres resulted in smaller size and more uniform morphology so as to increase the specific surface area. Meanwhile, the heterojunction was formed by coupling CeO 2 and Bi 2 WO 6 in the as-prepared microspheres, so that the separation efficiency of photogenerated electrons and holes was dramatically improved and the lifetimes of charge carriers were prolonged. Hence, introduction of CeO 2 could significantly enhance the photocatalytic activity of CeO 2 /Bi 2 WO 6 heterostructured microspheres and facilitate the degradation of TCH. This work provided not only a principle method to synthesize CeO 2 /Bi 2 WO 6 with the excellent photocatalytic performance for actual produce, but also a excellent property of the photocatalyst for potential application in photocatalytic treatment of tetracyclines wastewater from pharmaceutical factory.
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Materials Research Express
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2017
·Vol. 4
·期 2
·025605
·
IF 1.068
Xiaoqing Dai
Nano ZnO enhanced 3D porous reduced graphene oxide (RGO) with superior electromagnetic interferece (EMI) shielding efficiency (SE) was fabricated through a UV enhanced hydrothermal process. In this study, a composite with 10 wt% of 3D-RGO/ZnO was tested in a broadband frequency range from 2 to 18 GHz. Under the whole test conditions, the ratio of SEA/SET is higher than 50% and the maximum value can reach to 94%, indicating the shielding mechanism mainly attributes to absorption. The EMI SE showed that the thinnest thicknesses to shield different frequency range are 0.7 mm for 10 dB, 1.6 mm for 20 dB and 3.7 mm for 30 dB, which suggests 3D-RGO/ZnO could meet the requirement of new generate EMI shielding material.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Shihai Cao,Chenmin Xu,Zichang Guo,Yafang Hu,Yujing Tang,Huan Chen,Fang Jiang
A macroscopic urea-functionalized CdS (CdS-U) is synthesized for the first time. The CdS-U material is formed through the interaction between NH 2 / NH groups on urea and COO − groups on sodium oleate-capped CdS nanoparticles (CdS-So NPs). The CdS-U material exhibites excellent visible light photocatalytic activity and plasticity and has the potential to be produced as rewritable papers. It is convenience to produce a large-scale film by CdS-U. Letters can be written on the CdS-U film and disappear through a dissolution-irradiation process, and then the CdS-U film can be recycled by drying. This novel CdS-U material might be of interest and provide a new chance to advance the application of visible light photocatalyst on rewritable papers.
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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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MATERIALS & DESIGN
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2017
·
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
·
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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