Solar RRL
·
2022
·Vol. 6
·期 10
·2200536
·
IF 9.173
Rui Zhang,Linjia Li,YinYin Li,Dejun Wang,Yanhong Lin,Tengfeng Xie
CsPbBr 3 perovskite exhibits potential application in photocatalytic CO 2 reduction into valuable chemical fuels; however, enhancing carrier separation capability of the CsPbBr 3 and fully understanding the CO 2 reduction reaction process are still imperative. Herein, a new series of x SnS 2 /CsPbBr 3 nanocrystals (NCs)- y heterostructures are developed, which exhibit better catalytic activity in comparison with pure CsPbBr 3 NCs. Interface and surface carrier dynamic investigation reveals that this heterojunction structure can effectively improve carrier separation efficiency. Based on the interfacial electric field direction of CsPbBr 3 to SnS 2 , it is suggested that SnS 2 /CsPbBr 3 NC heterostructure satisfies Z-scheme transfer dynamics. Meanwhile, by the aid of in situ surface photovoltage, it is experimentally confirmed there is dynamic carrier interaction between CO 2 molecules and the SnS 2 /CsPbBr 3 NCs photocatalyst under irradiation, and a photocatalytic CO 2 reduction mechanism is thus proposed. This work expands the awareness of the interaction between CO 2 and the photocatalyst, which can be strongly influenced by carrier separation efficiency at the photocatalyst heterojunction.
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APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Lianyang Zhang,Yue Meng,Tiantian Dai,Yiyang Yao,Hui Shen,Bo Xie,Zheming Ni,Shengjie Xia
The decahedral morphology of BiVO 4 and ZnCr-layered double hydroxides (LDHs) nanosheets enables the construction of a BiVO 4 @LDHs Z -scheme heterojunction (BiVO 4 as core and LDHs as a shell) for photocatalytic degradation of norfloxacin, typical antibiotic. The effects of initial concentration of norfloxacin, catalyst loading, reaction temperature, and pH value on the performance of photodegradation were studied. It was found that the removal of norfloxacin can reach 90.3% under the optimized conditions. The core-shell structure enhances the specific surface area, improves the energetic alignment of the band structures, and produces enough hydroxyl and superoxide radicals to degrade norfloxacin. Density functional theory (DFT) calculations show that a built-in electric field is formed between ZnCr-LDHs and BiVO 4 , which promotes the transfer of photogenerated electrons from the valence band of ZnCr–LDHs to the conduction band of BiVO 4 . This transfer accelerates the flow of photogenerated electrons and reduces the recombination of electron-hole pairs, so that BiVO 4 @LDHs heterojunction shows excellent photocatalytic activity for norfloxacin.
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Science China-Chemistry
·
2023
·Vol. 66
·期 6
·1722-1730
·
IF 9.6
Xiao Ruixue,Zhang Jie,Jiang Tingting,Zhou Yefan,Wang Yun,Xu Wenjia,Feng Yuhua
Precise structural control had attracted tremendous interest in nanosynthesis due to its great importance in tailoring the physical properties of nanomaterials. Here we report the synthesis of highly ordered CdS-Au-TiO 2 ternary Janus structure via template-protected sequential growth and conversion method. Arising from the integration of the rectification effect of Au-CdS and Au-TiO 2 Schottky barriers, the Janus configuration of the CdS-TiO 2 domains, the plasmonic effect of Au nanosphere, and the Z -scheme charge transportation, the CdS-Au-TiO 2 Janus structure showed high efficiency in the model photocatalytic degradation of methyl orange (MO) dye. Importantly, the well-defined structural order allowed the identification of the correlation between the structure and the catalytic performance. We believe that the synthetic control and the mechanism insights would help the design and synthesis of sophisticated nanostructures, and would eventually promote their applications in photocatalysis fields.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xueying Du,Jiaxin Hu,Qihang Sun,Hongquan Fu,Juan Zhang,Jinming Chang,Hejun Gao,Yunwen Liao
Low-cost transition metal sulfides have been shown to be ideal candidates for photocatalytic hydrogen evolution . However, most preparation processes have long reaction times and high energy consumption. In this work, CuS/ZnCdS heterojunction was prepared by a rapid and energy-saving microwave method . It was characterized by SEM, TEM, XRD , XPS , and photoelectrochemical tests. The results showed that CuS was successfully loaded with ZnCdS and did not alter the intrinsic structure of ZnCdS. It not only improved the light absorption efficiency, but lowered the position of the conduction band and reduced the forbidden band width. The optimum photocatalytic hydrogen evolution rate of CuS/ZnCdS could get 7.58 mmol g −1 h −1 and the AQE was 10.07% at 420 nm. The enhanced photocatalytic activity can be attributed to the construction of Z-scheme heterojunction to promote the separation and transfer of photogenerated charges. This work provides a valuable route to explore high quality ZnCdS based photocatalysts using a fast, low-cost microwave technique.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Ning Shao,Juan Li,Shenglei Che,Jingwu Zheng,Liang Qiao,Yao Ying,Jing Yu,Wangchang Li
The phase composition, microscopic morphology, magnetic properties, and dielectric properties of composite ferrites consisting of (1-x) Ba 2.8 Bi 0.2 Co 2.2 Fe 22.6 Al 1.2 O 41 (Z) and x BaFe 12 O 19 (BaM) with x = 5,10,20,40 wt% were investigated before and after magnetization. To magnetize the composite ferrite, a soft magnetic phase was combined with a permanent magnetic phase, and the magnetic moment of the former was oriented by the applied magnetic field provided by the latter. The XRD and SEM analyses revealed that the grain size of the composite ferrite was around 1 μm. The actual percentage of BaM phase was higher, which had a diluting effect on the magnetic permeability of the composite ferrites. However, the saturation magnetization strength and coercivity increased with the increase of BaM content. Before magnetization, the relative permeability of the composite ferrites at 1 GHz ranged from 1.65 to 2.40, while it ranged from 1.61 to 2.30 after magnetization. After fitting the magnetic spectrum, it was observed that the equivalent applied field H increased after magnetization, and this increase was equivalent to the increase in anisotropic field of the samples. Moreover, H increased with the increase of BaM content, and the magnetic quality factor of the samples increased from 25–46 before magnetization to 34–102 after magnetization. The relative dielectric constants of the composite ferrites before and after magnetization ranged from 6.76 to 8.26 and 6.42 to 8.77, respectively, with no significant changes. The dielectric loss angle is slightly reduced to about 0.001. The characteristic impedance of Z/5%–40 % BaM ferrites is about 0.5, and the miniaturization factor ranges from 4.49 to 3.21. Additionally, these composites have low losses, making them suitable for UHF antenna miniaturization.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yibing Xie,Huihui Wu,Jianfei Luo,Shao Zhang,Langlang Wang,Xueqian Wang,Yixing Ma,Ping Ning
The incorporation of vanadium during the synthesis process induced a spontaneous and complete thermal phase transition from α-Bi 2 O 3 to β-Bi 2 O 3 . This phase transition facilitated the development of intrinsic electric field at the interface between V 2 O 5 and β-Bi 2 O 3 , consequently establishing a novel carrier transfer pathway. As a result, the fabricated V 2 O 5 /β-Bi 2 O 3 heterojunction exhibited an outstanding removal efficiency of over 98 % for gaseous mercury (Hg 0 ) under UV light, and this efficiency of 95.0 % even after 35 h of testing. Introducing vanadium enhanced the light absorption capacity in the ultraviolet region and effectively separated photoinduced charge carriers. As revealed by density functional theory calculations, the photoinduced electron–hole transfer in the V 2 O 5 /β-Bi 2 O 3 heterojunction followed the Z-scheme mechanism. This mechanism significantly contributed to the long-term stability of photocatalytic Hg 0 removal, even when H 2 O and NO were present. This study presents a novel material composited by a thermal phase transition technique, aimed at the highly effective and green removal of Hg 0 in the environment.
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ACS Applied Nano Materials
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2023
·
IF 5.9
Fan Wu,Chengwei Zhou,Guoyu Tai,Yang Ma,Xi Yang,Yuwei Pan,Jiangang Han,Weinan Xing,Guangyu Wu
Z-scheme heterojunction photocatalysts with excellent redox capability show great potential in the field of environmental remediation. In this research, ZIF-67 and BiOCl were used to construct metal–organic framework (MOF)-based heterostructures, which effectively achieved 97.4% rhodamine B (RhB) degradation and 78.2% tetracycline (TC) degradation under visible light irradiation. The cyclic experiments displayed that 15% ZIF-67/BiOCl remained structurally stable after 4 cycles. Reactive species trapping demonstrates that 1O2 and ·O2– were mainly responsible for RhB and TC degradation, which were inoculated with EPR results. This work also reveals the degradation path and mechanism of heterojunction, which provides insight into the synthesis of superior photocatalysts for environmental remediation.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
·
IF 4.3
Hongyun Xue,Gansheng Shi,Guanhong Lu,Xinhong Xu,Xiaomeng Ren,Yan Wang,Xiao Wang,Xiaofeng Xie,Jing Sun
Constructing heterojunction structures is considered one of the effective methods to improve the activity of photocatalysts. A novel Z-Scheme heterojunction Fe-BDC/TiO 2 was designed and synthesized by amorphous gel Fe-BDC and TiO 2 nanoparticles with electrostatic self-assembly method. The introduction of Fe-BDC has been proved to expand the light absorption range and promote the separation and transfer of interface photo generated electrons and holes. Thus, the photocatalytic degradation efficiency of acetaldehyde by 5% Fe-BDC/TiO 2 sample is 2.3 times than that of pure TiO 2 sample. And the reaction rate is 2.5 times than that of pure TiO 2 sample. The free radical capture experiment shows that O 2 − played a more important role in the degradation of acetaldehyde. In addition, in situ infrared analysis further reveals the surface species of the photocatalysts during adsorption and degradation processes. The acetaldehyde degradation route of Fe-BDC/TiO 2 has been speculated. ‘1These findings provide valuable references for the design of metal oxide semiconductor/Fe based MOF heterojunctions and the efficient degradation of aldehyde VOCs.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 45
·21010-21023
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IF 3.3
Taoming Yu,Li Liu,Yuehui Wang,Shiwen Zhang,Lili Li,Ce Liang
The construction of photocatalysts with a Z-scheme heterojunction is considered to be a superior strategy for improving photocatalytic activity. In this study, a photocatalyst (PI/TiC/TiO2) with a Z-scheme heterojunction was fabricated, in which polyimide (PI) and TiO2 were used as the organic/inorganic semiconductor photocatalyst and TiC acted as the transmission bridge for electrons between PI and TiO2. In the self-made air flow photocatalytic reactor, the photocatalytic degradation efficiencies of organic dyes by PI/TiC/TiO2 increased with the increase of both the concentration and diffusion rate of O2. The degradation efficiencies of RhB and MB by PI/TiC/TiO2 reached 93.87% and 90.96%, respectively, within 90 min of visible light exposure, showing its outstanding photocatalytic performance. The mechanism analysis indicated that the Z-scheme heterojunction in PI/TiC/TiO2 facilitated the separation and migration of photoexcited charges while retaining stronger redox capabilities for charge carriers. This study provides an insight into the construction of visible light responsive organic/inorganic photocatalysts with Z-scheme heterojunctions for organic pollution treatment applications.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Miao Hu,Aihua Yan,Fan Li,Fei Huang,Ji Huang,Qiaopeng Cui,Xinyang Wang
Heterojunction photocatalysts with intimate contact are very promising for organics photodegradation due to their high efficiency in enhancing the light absorption, inhibiting the carrier recombination and improving the photogenerated electron/hole separation. In this study, we demonstrated a two-step hydrothermal method to construct indium sulfide/bismuth oxybromide (In 2 S 3 /BiOBr) heterojunctions for the first time. Importantly, the optoelectronic dynamics of carrier separation efficiency, charge transport and electron/hole recombination rate were tuned to an optimal domain through a series of experiments. As a result, the photocatalytic activity of In 2 S 3 /BiOBr heterojunctions was greatly enhanced under visible-light irradiation. The as-synthesized IS/BOB-0.2 heterojunctions exhibited the highest photocatalytic ability, which was approximately 4.75 times and 11.26 times higher than that of pure BiOBr and TiO 2 P25 catalysts. This work will provide a better insight into the formation mechanism BiOBr-based Z-scheme heterojunctions with high photocatalytic performance.
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Solar RRL
·
2021
·Vol. 5
·期 5
·2100036
·
IF 8.582
Jun-Yan Li,Hong-Yan Chen,Yong Jiang,Dai-Bin Kuang
To make full use of solar energy and achieve effective separation of photogenerated carriers, semiconductor heterojunction engineering is becoming increasingly significant nowadays. Herein, Cs x WO 3 /CsPbBr 3 heterojunctions via cosharing the Cs atom are synthesized by a facile acid solution method, which involves the in situ growth of CsPbBr 3 nanoparticles on the surface of Cs x WO 3 nanorods. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) tests confirm that a high-quality interface with strong interaction between Cs x WO 3 and CsPbBr 3 is constructed successfully. Thus, a direct Z-scheme charge transfer pathway is built in such close-contact heterojunctions, which can not only effectively prevent the recombination of photogenerated carriers, but also preserve the carriers with higher redox abilities, as confirmed by electron spin resonance (ESR) as well as Kelvin probe force microscopy (KPFM). As a proof of concept, the photocatalytic hydrogen production performance of Cs x WO 3 /CsPbBr 3 is evaluated in ethyl acetate, and a 17-fold enhancement in hydrogen production rate as compared with pristine Cs x WO 3 is obtained, verifying the effective charge separation in such heterojunctions. Herein, a new idea for in situ synthesis of high-quality perovskite-based heterojunctions is provided, which will broaden their optoelectrical applications.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 42
·19903-19916
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IF 3.591
SongSik Pak,KwangChol Ri,Chenmin Xu,Qiuyi Ji,Dunyu Sun,Chengdu Qi,Shaogui Yang,Huan He,MyongNam Pak
The g-C3N4/Y-TiO2 Z-scheme heterojunction photocatalysts were successfully synthesized. Powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used for characterization. The photocatalytic activity of the as-prepared samples was investigated via the degradation efficiency of rhodamine B (RhB) under visible-light irradiation, and 20 mg L−1 RhB was completely degraded in 90 min. The results showed that the photocatalytic degradation of RhB conformed to pseudo-first-order kinetic fitting, and the kinetic constants of g-C3N4/Y-TiO2 were 4.27 times higher than those of g-C3N4/TiO2 and 14.18 times higher than those of Y-TiO2, respectively. The enhanced photocatalytic activity of g-C3N4/Y-TiO2 was due to the formation of a Z-scheme heterojunction by Y at the g-C3N4/TiO2 interface. Formation of the Z-scheme heterojunction resulted in the suppression of photo-generated electron–hole pair recombination and the increase of their lifetimes, which was demonstrated by the transient photocurrent response, electrochemical impedance spectroscopy, and the time-resolved photoluminescence spectra. The superoxide radical and photo-generated holes played a dominant role in the photocatalytic degradation process of RhB by g-C3N4/Y-TiO2.
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