RSC Advances
·
2015
·Vol. 5
·期 84
·68953-68963
·
IF 3.84
Xi Chen,Banghong Zhou,Shuanglei Yang,Hanshuo Wu,Yuxin Wu,Laidi Wu,Jun Pan,Xiang Xiong
Herein, a strong heterojunction, consisting of SnO2 nanoparticles grown on layered g-C3N4 nanosheets, was rationally designed and successfully synthesized via a facile hydrothermal method. The morphology, chemical structure, optical and electronic properties of the obtained SnO2/g-C3N4 hybrid nanocomposites were characterized. Furthermore, the photocatalytic activity of the novel photocatalysts was assessed. The results clearly indicate that the SnO2/g-CN-72.12% nanocomposite photocatalysts shows a stable cycle performance and exhibits significantly enhanced photocatalytic activity, which is 89 and 17 times higher than those of pure SnO2 and g-C3N4, respectively. The synergistic effect of the SnO2/g-C3N4 heterojunction can effectively accelerate the separation of photo-generated carriers and enhance the efficiency of interfacial charge transfer, which are proposed to be responsible for the enhancement of the photocatalytic activities. This study provides a low-cost and large-scale synthesis route for the production of visible light responsive photocatalysts that have potential in environmental purification applications.
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RSC Advances
·
2019
·Vol. 10
·期 1
·228-235
·
IF 3.049
Bojie Yuan,Minghao Sui,Hongtao Lu,Jingyu Wang,Jie Qin
Understanding the effect of various environmental factors on the transformation of silver nanoparticles (Ag NPs) is crucial to determine their toxicity and fate in the environment. Ag NPs are inevitably exposed to sunlight and will be in contact with chloride (Cl−), a ubiquitous ligand in natural water, once released into the environment. In this study, the combined effect of Cl− and light on various physicochemical properties (optical property, dissolution, morphology, surface charge) of different sizes Ag NPs was studied. The results showed that light irradiation, in the presence of Cl−, led to a great decrease in the concentration of dissolved Ag and a remarkable increase in the zeta potential of Ag NPs, as well as the generation of some tiny Ag NPs and fusion aggregates. AgCl was suggested to rapidly coat onto Ag NPs after exposure to Cl−. And the AgCl layer was obviously destroyed by photoreduction under light irradiation. Meanwhile, the Ag NP size exhibited a great impact on the destruction of the AgCl layer. It was further observed that the AgCl layer gradually re-formed when the light was removed, which suggested that Ag NPs might present different states during the daytime and at night in aquatic environments.
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Surfaces and Interfaces
·
2021
·
IF 4.837
Hu Zhou,Wenjia Qu,Ming Wu,Zhengqiu Yuan,Jian Jian,Lei Zhang,Tiefan Huang
A novel BiOBr/Bio-vein photocatalyst was synthesized with a wet drop addition method, where the substrate biological veins (Bio-veins) were obtained with a green and environmentally-friendly multiple route. BiOBr/Bio-veins composite show larger visible light adsorption compared with pure BiOBr, and the size of BiOBr nanosheet from BiOBr/Bio-veins composite is smaller than that of pure BiOBr. BiOBr/Bio-veins composite shows highly photocatalytic degradation of Rhodamine B (RhB) under visible light irradiation. Reactive species trapping experiments and electron paramagnetic resonance (EPR) tests were used to explore photodegradation mechanism of BiOBr/Bio-veins, which demonstrated that superoxide radicals (•O 2 − ) and holes (h + ) were the main active groups for photocatalytic degradation. Moreover, BiOBr/Bio-veins composite can be easily recovered without centrifugation and filtration. This study provides novel natural biological materials to immobilize photocatalyst particles with highly photocatalytic degradation of pollutants.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 8
·4785-4793
·
IF 3.9
Dafeng Zhang,Ruiqi Zhang,Junchang Liu,Xipeng Pu,Peiqing Cai
Photocatalytic H 2 evolution technique has been proved to be one of the promising approaches to overcome the present energy and environmental issues caused by the combustion of fossil fuel. Constructing heterojunction can realize the efficient separation and migration of charges and thus achieve enhanced H 2 evolution performance. Herein, we designed and prepared a ZnIn 2 S 4 /BiFeO 3 heterojunction photocatalyst with a 3D/2D structure via an ultrasonic self-assembly process. The typical 3D/2D structure with intimate interface was obtained, which not only provided more active sites but also boosted the migration of photogenerated charges. The optimal mass ratio of BiFeO 3 in ZnIn 2 S 4 /BiFeO 3 was determined to be 10%, and a 10.5-fold increase in H 2 evolution rate in comparison with of pure ZnIn 2 S 4 was achieved. Furthermore, the ZnIn 2 S 4 /BiFeO 3 composite exhibited excellent recyclability and structural stability based on cycling experiment. A S-scheme heterojunction mechanism was revealed according to the experimental results of photocatalytic H 2 evolution and electrochemical tests.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 9
·e4448
·
IF 3.581
Shiyu Zuo,Haiming Xu,Wei Liao,Lei Sun,Donghui Han,Jie Zan,Binyang Zhang,Dongya Li,Dongsheng Xia
Acid-treated g-C 3 N 4 -Cu 2 O was prepared by hydrothermal reduction followed by high temperature calcination and acid exfoliation. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, Photoluminescence Spectroscopy and the Brunauer–Emmett–Teller (BET) theory. The photocatalytic activity was evaluated by measuring the photodegradation of methyl orange under visible-light irradiation. Based on the results of TEM, XPS, EPR and other techniques, it was verified that a heterojunction was formed. The acid treatment process can increase the specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, thereby enhancing its light utilization and quantum efficiency. Results indicate that acid-treated g-C 3 N 4 -Cu 2 O possesses a large specific surface area, which provides plentiful activated sites for heterojunctions to form; in addition, it showed a high visible light effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O material exhibits high levels of effectiveness and stability. Electron paramagnetic resonance and a series of radical trapping experiments demonstrate that the holes and •O 2 − could be the main active species in methyl orange photodegradation. This work could provide new insights into the fabrication of composite materials as high-performance photocatalysts, and facilitate their application in addressing environmental protection issues.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Binyang Zhang,Mengdie Chen,Dongya Li,Haiming Xu,Dongsheng Xia
FeOCl was prepared by a partial thermal decomposition method to effectively catalyze hydrogen peroxide under the visible light for the degradation of toxic organic wastewater. The combination of DRS and VB-XPS indicated that FeOCl is a narrow band gap catalyst with visible light absorption capacity (Eg =1.63 eV). The degradation rate constant of RhB in FeOCl/H 2 O 2 /Vis system is about 13.4 times that of FeOCl/H 2 O 2 system. Compared to other heterogeneous Photo-Fenton systems, the oxidant utilization efficiency in FeOCl/H 2 O 2 /Vis system is higher. In addition, FeOCl has stable Photo-Fenton activity in a wide pH range (3.0–9.0). The content of Fe(II) increased after 5 cycles reaction through the ESR and XPS characterization, which proves that the electron transfer of Fe(III)/Fe(II) was improved during the reaction. After quantitative analysis of the ·OH generated in the reaction, the formation rate of ·OH in FeOCl/H 2 O 2 /Vis system is increased about 30% compared with FeOCl/H 2 O 2 /dark system. These results indicate that visible light excites FeOCl to generate produces photogenerated electron-hole pairs, accelerating the cycle of Fe(III)/Fe(II), promoting the production rate of ·OH, and enhancing the catalytic efficiency of FeOCl.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ping Xue,Xin Pan,Jiming Huang,Yijun Gao,Wei Guo,Junsheng Li,Mi Tang,Zhengbang Wang
Construction of porous metal–organic framework (MOF)/covalent organic framework (COF) hybrid photocatalysts for enriched structures and unprecedented properties is still a great challenge but highly desirable. Herein, a new series of Cu3(HHTP)2-MOF/Tp-Pa-1-COF hybrids with different MOF content are successfully fabricated. The as-prepared MOF/COF hybrids exhibit intimate interaction based on the coordination of Cu ions with the carbonyl oxygen and enamine nitrogen groups in Tp-Pa-1. The integrated conductive Cu3(HHTP)2 is able to act as an excellent electron extractor instead of noble metal cocatalysts to significantly promote the charge transfer and inhibit the recombination of photogenerated electron–hole pairs. As a results, the optimized photocatalyst with Cu3(HHTP)2:Tp-Pa-1 ratio of 1:15 achieves the highest hydrogen evolution rate of 1.76 mmol·h–1·g–1 under visible-light irradiation, which is about 93 times higher than that of the pure Tp-Pa-1 and even slightly higher than that of the Tp-Pa-1 with Pt (3 wt %) as a cocatalyst.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yu Sun,Jinyong Hu,Yong Zhang
Transition metal dichalcogenides (TMDs) have been received widespread attention for NO 2 detection at room temperature . However, the TMDs-based gas sensors usually possess inferior response capability and suffer from humidity interference due to lack of sufficient reaction activation energy , which seems tough to achieve the detection of ppb-level gases and hinder the practical applications. Herein, we propose a visible light-assisted-type gas sensor based on Au-decorated WS 2 , endowing high-performance detection of NO 2 at room temperature. Benefited from the localized surface plasmon resonance (LSPR) enhancement effect induced by the modified Au nanoparticles (NPs), the visible light-assisted Au/WS 2 gas sensor can implement the detection of NO 2 gas as low as 20 ppb. Moreover, the maximum drift of the sensor response value is only 3% in the range of 10%−90% RH, indicating the stabilized anti-humidity ability. The effective regulation of transmission channel by the modified noble metal and the enhancement of visible light absorption of WS 2 through taking full advantage of the LSPR effect are the main reasons for realizing low concentration detection and improving the anti-humidity ability. Therefore, the visible light-assisted gas detection mode can serve as a proof-of-concept to provide an effective approach for the detection of trace gases at room temperature.
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DYES AND PIGMENTS
·
2015
·
IF 3.966
Yi Chen,Wenqing Liang,Wing Hong Choi,Jinhai Huang,Qingchen Dong,Furong Zhu,Jianhua Su
Two novel host materials based on 5- and 9-substituted benzocarbazole have been developed for application in phosphorescent organic light-emitting diodes. Both host materials exhibit excellent thermal stability with high decomposition temperatures of ca.515 °C, while the 9-substituted benzocarbazole derivative exhibits a high glass transition temperature of 181 °C. Additionally, the electroluminescence characteristics of green phosphorescent organic light-emitting diodes made with two new host materials were also evaluated. The devices exhibited an electroluminescent emission peak at 528 nm with CIE coordinates of (0.31, 0.64) and possessed low turn-on voltages of <2.84 V.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Taotao Zhan,Junshuai Chen,Xin Li,Qi Zhou,Maogang He,Ying Zhang
The experimental speeds of sound combined with Brillouin frequency shifts of ethyl laurate at temperatures from 294.97 to 572.89 K along six isobaric lines from 0.1 to 10.0 MPa were measured by Rayleigh–Brillouin light-scattering spectroscopy. The expanded relative uncertainty in the reported speeds of sound in ethyl laurate is estimated to be 1.3% (coverage factor k = 2 with a confidence level of 0.95). Within the temperature limits of 303.15–383.15 K and at pressures up to 10.0 MPa, the derived thermoacoustic properties of ethyl laurate including density, specific isobaric heat capacity, isentropic compressibility, isobaric thermal expansivity, isothermal compressibility, the difference in isobaric and isochoric heat capacity, internal pressure, and intermolecular free length were studied. Because of the heavily updated data of density and the speed of sound in the literature, a modified Jacobson’s model for biodiesels was proposed over the temperature range from 293.15 to 343.15 K, which is able to calculate the intermolecular free length of ethyl laurate with higher accuracy compared with Jacobson’s model.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinyu Du,Xue Bai,Lu Xu,Lei Yang,Pengkang Jin
A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation . The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 − , OH and h + all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol , bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhu Qing Li,Du Cong,Dai Yahao,Daab Matthias,Matejdes Marian,Breu Josef,Hong Wei,Zheng Qiang,Wu Zi Liang
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as the motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators to achieve similar purposes. Here we report a hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered by light irradiation. A muscle-like poly( N -isopropylacrylamide) nanocomposite hydrogel is prepared by electrical orientation of nanosheets and subsequent gelation. Patterned anisotropic hydrogels are fabricated by multi-step electrical orientation and photolithographic polymerization, affording programmed deformations. Under light irradiation, the gold-nanoparticle-incorporated hydrogels undergo concurrent fast isochoric deformation and rapid increase in friction against a hydrophobic substrate. Versatile motion gaits including crawling, walking, and turning with controllable directions are realized in the soft robots by dynamic synergy of localized shape-changing and friction manipulation under spatiotemporal light stimuli. The principle and strategy should merit designing of continuum soft robots with biomimetic mechanisms.
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