MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Yiyin Guan,Wenjie Liu,Shixiang Zuo,Xiangyu Yan,Jingyi Ni,Chao Yao,Fengqin Wu
Firstly, Sb–SnO 2 /potassium titanate (Sb–SnO 2 /K 4 TiO 4 (KTO)) was fabricated by a sol-gel method, and then TiO 2 nanorod arrays were grown on the surface of Sb–SnO 2 /KTO by a hydrothermal method (TiO 2 NRA/Sb–SnO 2 /KTO). The photocatalytic activity was evaluated by degrading tetracycline hydrochloride (TCH). The prepared samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), ultraviolet–visible diffuse reflectance spectrometer (UV–Vis), and X-ray photoelectron spectroscopic characterizations (XPS). The results show that the Z-scheme heterojunction formed between SnO 2 /KTO and TiO 2 can enhance the range of light response. With the doping of Sb, the conductivity of the composite is enhanced, which is advantageous to the transfer of electron and the low recombination rate of electron-hole pairs. Thus, the doping of Sb is effective to improve the photocatalytic performance. Our work demonstrates the optimal doping amount of Sb is 5%. The degradation efficiency of TCH concentration can reach 95.6% after 2 h and TiO 2 NRA/Sb–SnO 2 /KTO shows good reusability .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ping Wei,Shiheng Yin,Tao Zhou,Chao Peng,Xiaolong Xu,Juncai Lu,Minchao Liu,Jianbo Jia,Kun Zhang
The occurrence of pharmaceutical and personal care products (PPCPs) in the ambient environment has raised serious concerns. Herein, a dispersed ZnFe 2 O 4 nanoparticle loaded Ag@Ag 2 CO 3 nanorod hybrid (ZnFe 2 O 4 /Ag@Ag 2 CO 3 ) was facile prepared, and used as a solar light driven photocatalyst for the degradation of tetracycline (TC), a typical PPCPs. The hybrids were characterized by XRD, SEM, EDS, HRTEM, DRS, PL, TRPL, M−H , BET, XPS, ESR and photoelectrochemical testing. The ZnFe 2 O 4 was evenly dispersed on the surface of Ag@Ag 2 CO 3 nanorods of which diameter was about 100 nm. The obtained ZnFe 2 O 4 /Ag@Ag 2 CO 3 composites exhibited high TC degradation efficiency after 150 min Xe light illumination, which was much better than those of pure Ag@Ag 2 CO 3 and ZnFe 2 O 4 . The photodegradation reaction rate constant ( k ) of the optimum ternary photocatalyst (ZnFe 2 O 4 loading 5% wt) increased 4.04 times and 2.48 times than those of pure ZnFe 2 O 4 and Ag 2 CO 3 @Ag, respectively. More importantly, the stability and recovery capacity of the ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalyst improved obviously than those of Ag@Ag 2 CO 3 . The reactive oxygen species (ROS) experiment indicated that • OH、h + and • O 2 − involved in the photocatalytic reaction process, and the ROS contributes order was • O 2 − > h + > • OH. The band positions of individual ZnFe 2 O 4 and Ag 2 CO 3 were elucidated via DRUV–Vis spectra and Mott-Schottky plots. Based on the results of ROS experiment and band structure of ZnFe 2 O 4 and Ag 2 CO 3 , it could be inferred that the photocatalytic reaction of ZnFe 2 O 4 /Ag@Ag 2 CO 3 abided by Z-scheme mechanism, that is, Ag acted as the electronic bridge between Ag 2 CO 3 and ZnFe 2 O 4 , and the • OH and • O 2 − were formed on the valence band (VB) of Ag 2 CO 3 and conduction band (CB) of ZnFe 2 O 4 , respectively, and then TC was further oxidized. The sufficient photocatalytic degradation of TC in ambient water revealed that a sunlight-driven ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalytic process may be efficiently applied for the remediation of PPCPs contaminated natural waters.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Na Chang,Yan-Ru Chen,Feng Xie,Ya-Pan Liu,Hai-Tao Wang
It is of great importance to fabricate photocatalyst with high photocatalytic activity, and the formation of Z-scheme heterojunction photocatalyst has been proved to be an effective way to restrain the recombination of photo-induced carriers. In this work, Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction is synthesized via a two-step process involving appropriate amount of cationic Ag ion doping into the imidazole ring of ZIF-8 framework and the precipitation of AgCl onto this Ag-doped-ZIF-8. The successful doping of ZIF-8 which decreases the band gap energy, enhances the light harvesting. Besides, the separation efficiency of photo-induced carriers is further improved due to the formation of Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction, which is confirmed by photoelectrochemical experiments. As a result, the as-prepared AgCl/Ag-doped-ZIF-8 photocatalyst possesses excellent photocatalytic activity under visible light illumination. This work will provide a novel perspective for the design and construction of Z-scheme heterojunction for highly efficient photocatalysis.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Qiong Sun,Peng Hou,Songhao Wu,Liyan Yu,Lifeng Dong
A Z-scheme mechanism associated with localized surface plasmon resonance (LSPR) effect is proposed and proved in a ternary Ag-Fe 2 O 3 -TiO 2 composite for photocatalytic reactions. The Ag, Fe 2 O 3 and TiO 2 nanoparticles are prepared to exist in a closely connected Ag-Fe 2 O 3 -TiO 2 heterostructure . Compared to TiO 2 , the addition of Ag-Fe 2 O 3 causes a broad absorption in visible region by LSPR effect of Ag to facilitate electron transfer from TiO 2 to Ag. In addition, electron migration from TiO 2 to Fe 2 O 3 can also be detected, indicating the interface between TiO 2 and Fe 2 O 3 can offer a route with low resistance for charge separation and directional transfer. As a result, photocatalytic activities are greatly improved in Ag-Fe 2 O 3 -TiO 2 , with the highest calculated apparent kinetic constant located at 0.027 min −1 , which is 7.3, 1.9, 1.7 and 1.5 times of Ag-Fe 2 O 3 , TiO 2 , Ag-TiO 2 and Fe 2 O 3 -TiO 2 , respectively. Free radical quenching experiments show that O 2 -∙ and positively charged holes are main oxidative species responsible for the degradation of dyes. Specifically, OH∙ radicals can be hardly found in pure TiO 2 under irradiation but can be extensively produced and participate in the degradation after the addition of Ag-Fe 2 O 3 , which further proves that a Z-scheme route dominates the electron transfer between TiO 2 and Fe 2 O 3 .
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Yingying Jiao,Yike Li,Jianshe Wang,Zhanhang He,Zhongjun Li
Photocatalyst with double Z-scheme mechanism can promote the separation and transmission of photo-induced carriers effectively. In this work, a novel C 3 N 4 nanotube (CNT)/N-doped carbon dots (NCDs)/Ni 2 P composite photocatalyst was prepared by decorating NCDs and Ni 2 P nanoparticles on CNT, respectively. A variety of test results, including photoluminescence spectra (PL), electrochemical impedance spectrum (EIS) and transient photocurrent responses (TPR), show that compared with CNT and CNT/Ni 2 P, CNT/NCDs/Ni 2 P composite can dramatically facilitate the separation and transmission of charge. Impressively, the CNT/NCDs/Ni 2 P composite achieves a hydrogen evolution rate of 627.2 µmol g -1 h −1 which is well above that of CNT and CNT/Ni 2 P, respectively (no detection and 48.5 μmol g -1 h −1 ). Combining the above characterization results with energy band calculation, we speculate that the remarkably optimized photocatalytic activity was predominantly ascribed to the double Z-scheme charge transfer mechanism for CNT/NCDs/Ni 2 P nanocomposite. This work provides a new member for family of photocatalysts with double Z-scheme mechanism, which is beneficial to further fundamental and applied research.
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高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Min Zhou,Jiang Wu,Huaning Wang,Dayong Guan,Xinfeng Dong,Jianmin Wang,Tao Jia,Qizhen Liu
Constructing a heterojunction and designing a band gap are effective methods to promote the efficiency of a photocatalyst and solar energy utilization. In this work, g-C3N4/Yb3+-Bi5O7I nanostructured photocatalysts were successfully prepared using a hydrothermal method with glycol as a solvent and a calcination method, and the performance of the photocatalysts containing different amounts of g-C3N4 was studied. A series of characterizations confirmed the successful complexation of g-C3N4 nanosheets with Bi5O7I, and Yb3+ was successfully doped into the lattice of Bi5O7I. g-C3N4 and Yb3+ have a synergistic effect on expanding the photoresponse range of CYB(g-C3N4/Yb3+-Bi5O7I) composite photocatalysts. As expected, CYB samples have wonderful photocatalytic performance and stability in the removal of Hg0, among which CYB-20 has the highest removal efficiency, reaching 79%. Yb3+ with upconversion characteristics can convert infrared light into visible light and form new energy levels in Bi5O7I. g-C3N4 and Bi5O7I form a Z-scheme heterojunction to improve the photocatalytic performance of Bi5O7I. Besides, the electron and hole transmission paths and the catalytic mechanism of the photocatalysts are also proposed. This work offers a new approach to construct a photocatalyst system for pollutant emission control with a wide wavelength range of sunlight, which may be helpful to develop environmentally benign functional materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Dongbo Wang,Xin Yu,Qingge Feng,Xianhao Lin,Ying Huang,Xianqing Huang,Xiang Li,Kao Chen,Bohan Zhao,Zhao Zhang
In order to construct tighter heterostructures , a novel Z-scheme β-Bi 2 O 3 /g-C 3 N 4 composite (xBC) was synthesized by in-situ growth method. The crystal phase, morphology, chemical composition, optical and photoelectrochemical properties of the composites were investigated by XRD , FT-IR, SEM, TEM, XPS, UV–vis DRS , EIS , etc. The characterizations verified that β-Bi 2 O 3 nanosheets grew uniformly on the surface of g-C 3 N 4 . Meanwhile, the photocatalytic performance of xBC composites were also evaluated by degrading Rhodamine B (RhB) and p -Nitrophenol (PNP) under visible-light irradiation. As a result, 0.5BC exhibited the most superior performance, the removal efficiencies reached 71.6% for PNP in 300min and 94.8% for RhB in 120 min, with a rate constant (0.0233min −1 ) of 7.1 and 5.8 times than that of g-C 3 N 4 and β-Bi 2 O 3 , respectively. Evidences that Z-scheme carries transfer path were strongly confirmed by XPS, PL and reactive species analysis.
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高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Bo Lv,Lili Lu,Xuefan Feng,Xiaoping Wu,Xiaoming Wang,Xiong Zou,Fuqin Zhang
Photocatalysis is one of the most promising ways to realize artificial photosynthesis. The biologically inspired photocatalysts with 3D flower-like structures have attracted much attention. In this study, an effective method for the synthesis of composite photocatalytic material, NH 4 TiOF 3 /TiO 2 /g-C 3 N 4 , with a 3D camellia-like structure, was developed. The 3D hierarchical structure of the composite material enabled multiple refractions and reflections of light within the catalyst, which greatly improved the efficiency of the sunlight harvesting. The combination of NH 4 TiOF 3 and TiO 2 also effectively reduced the electron-hole recombination in the g-C 3 N 4 . To evaluate its photocatalytic performance, the prepared nanostructured composite materials were tested for the water-splitting with simulated sunlight. It showed the hydrogen evolution at the rate of 3.6 mmol/g/h, which is 4.0 times faster than that from the pure g-C 3 N 4 . The composite materials exhibited excellent cycling stability. The detailed mechanism of the Z-scheme heterojunction was also discussed. The proposed synthesis route for the creation of 3D flower-like hierarchical composites provides a new effective technique for developing efficient, active, and stable composite photocatalysts for hydrogen production.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
He Wang,Jie Yu,Xiaohui Zhan,Lei Chen,Yanping Sun,Huixiang Shi
The development of high-efficiency heterostructure photocatalysts is an attractive strategy for aquatic pollutants degradation. Herein, a novel 2D/2D Z-scheme heterojunction between SnNb 2 O 6 nanosheets and flower-shaped ZnO nanosheets was designed and fabricated through a simple two-step hydrothermal method. As expected, the obtained composite photocatalyst exhibits outstanding photodegradation efficiencies for RhB and phenol. The optimal reaction rate constant over 20%-SnNb 2 O 6 /ZnO heterostructure in RhB degradation is almost 15.03 and 3.95 times higher than pristine SnNb 2 O 6 and ZnO, respectively. Such an improved photocatalytic activity is mainly ascribed to the broader optical absorption and facilitated charge separation, which can be proved by various analytical methods. This designed composite also displayed excellent stability in four-cycle experiments. Additionally, a possible direct Z-scheme electron migration mechanism under an internal electric field was proposed with the aid of reactive species trapping experiments. This work provides a feasible strategy to obtain high-performance photocatalysts and might inspire a new perspective in the design of other 2D/2D Z-scheme heterojunctions for environmental purification.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
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IF 3.871
Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Shuaishuai Xin,Chengze Yu,Bin Zhang,Yanjun Xin
Netlike 3D Z-scheme graphitic carbon nitride (g-C 3 N 4 ) nanosheets decorated TiO 2 nanobelt-tubes (TNBTs) photoelectrodes (g-C 3 N 4 /TNBTs) were fabricated via anodization and coating technology. The network 3D photoelectrodes were characterized by HR-TEM, XPS and UV–Vis/DRS. The photoelectrochemical properties were examined to reveal the transfer and separation efficiency of photogenerated electrons. The photocatalytic activity was investigated by the photocatalytic decomposition of tetracycline hydrochloride (TC) under light irradiation. Results showed that g-C 3 N 4 with rugged surface were loaded on TNBTs by chemical bond joint to form heterostructure. The g-C 3 N 4 /TNBTs exhibited stronger visible light absorption and reduced recombination of photogenerated electron-hole pairs than TNBTs. The photocurrent response of g-C 3 N 4 /TNBTs was ~1.88-fold that of TNBTs. The photocatalytic rate of g-C 3 N 4 /TNBTs for TC was significantly higher than that of TNBTs (0.017 min −1 vs 0.007 min −1 ). The O 2 − and h + were the dominant oxidation species during the degradation of TC. The possible photocatalytic mechanism of constructing Z-scheme heterojunction was also proposed.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Hongjie Zhu,Lingxuan Gong,Zhihao Chen,Youyou Hu,Zhengkui Li
The Z-scheme photocatalyst is valuable for use in polluted water purification, and there is a need to develop a cheap and efficient photocatalyst. This study presents a new type of Z-scheme photocatalytic material composed of hematite and P3HT, also, the Al cluster oxides were first used as a charge transfer mediator to construct Z-scheme photocatalysis system. In addition, by analyzing the electron rearrangement phenomenon exhibited by the XPS spectrum and the experimental results of the in-situ illumination XPS, it is found that Al cluster is beneficial to the electron multi-step charge transfer process and Al cluster favors the construction of Z-scheme structure between hematite and P3HT. This Poly-3-hexylthiophene (P3HT)/Al cluster oxide/hematite ternary photocatalyst exhibited an excellent degradation effect on bisphenol A and tetracycline. This study demonstrates the feasibility of using the Al cluster as a charge mediator in the Z-scheme, providing new Z-scheme catalyst construction idea which is beneficial to the popularization and use of Z-scheme system in practical applications, and providing a new material for water pollution purification.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
Based on hollow spherical NiCo 2 S 4 , Zn x Cd 1-x S with adjustable band structure was used to construct a composite for photocatalytic hydrogen evolution. The hollow spherical structure of NiCo 2 S 4 gives Zn x Cd 1-x S more contact positions to form a stable heterojunction. Through the band structure adjustment for Zn x Cd 1-x S, the induced electron transfer model was transformed into Z-scheme, which effectively enhances the photo-produced carrier separation efficiency of the composite material. At the same time, the fast electron transfer is realized by the great conductivity of the hollow spherical NiCo 2 S 4. This allows the composite material to obtain a shorter average lifetime of PL (0.15 ns) compared to Zn 0.5 Cd 0.5 S (3.9 ns). The composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S with Z-scheme heterojunction exhibited excellent photocatalytic HER activity and stability due to its unique spatial structure and efficient Z-scheme electron transfer path. The optimized composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S 1:1 photocatalytic HER rate reached 233.68 μmol . h −1 , which is equivalent to 5.81 times that of Zn 0.5 Cd 0.5 S (40.25 μmol . h −1 ).
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