CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Rui Ji,Zhuzhu Zhang,Lechen Tian,Liujun Jin,Qingfeng Xu,Jianmei Lu
A novel BiOI-incorporated NH 2 -UiO-66 composite photocatalyst, NH 2 -UiO-66@BiOI, was prepared using an in-situ successive ion-insertion method. The in situ grown BiOI nanosheets exhibited an ultrathin structure and were uniformly dispersed on NH 2 -UiO-66. The formation of tight heterojunctions, characteristics of enhanced visible light absorption and availability of abundant exposed active sites facilitated the efficient activation of peroxymonosulfate and the rapid degradation of Bisphenol A in water (12 min). Surprisingly, the photocatalyst maintained a fast degradation rate of Bisphenol A under the interference of different conditions. The research explored the charge transfer pathways and radical species between the heterojunction components, indicating that the heterojunction type of the NH 2 -UiO-66@BiOI was Z-scheme. In addition, the degraded intermediate components and high mineralization rate indicated that Bisphenol A was deeply degraded. In conclusion, this study synthesized metal–organic framework-based photocatalysts through a simple preparation method, which has potential application value in the rapid degradation of bisphenol A.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 34
·16584-16592
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IF 3.925
Yingdi Wang,Liangliang Lin,Yuming Dong,Xiang Liu
The MOF-808/AgI (MA) photocatalyst was synthesized through a plain ion-exchange precipitation means. The crystalline phase structure, microcosmic appearance, elemental composition and optical performance of the catalyst were tested by XRD, SEM, TEM, XPS, UV-vis DRS, EIS, PL and ESR techniques. Tetracycline hydrochloride (TC) was selected as the simulated contaminant for photodegradation experiments to estimate the photocatalytic properties of the as-prepared materials. The results suggested that the degradation performance of the MA compounds was significantly enhanced, and the composite with a AgI loading of 40% (MA-40) showed the best degradation performance with a 93.65% degradation rate in 80 min. Furthermore, the radical capture experiments proved that ˙O2−, 1O2 and h+ were the principal active intermediates in the photochemical catalysis process. Therefore, it can be speculated that the loading of AgI enhanced the visible light absorption and a Z-scheme heterojunction between the two components was formed, which promoted the separation of photogenerated carriers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Chentao Hou,Yijie Li,Miaomiao Niu,Yi Liu,Xianghui Kong,Mingyuan Zhang,Liping Wang
Photocatalysis is still a promising technology to alleviate the antibiotic residual problem of wastewater in the ecological environment. Herein, an all-solid-state Z-scheme Ag@Ag 3 PO 4 /TiO 2 -(F 2 ) (TFAP) heterojunction photocatalyst was constructed using the hydrothermal method for the first time. The photocatalytic performance of TFAP nanocomposites for tetracycline hydrochloride (TCH) degradation was evaluated under simulated sunlight. The prepared materials were characterized by XRD , FE-SEM, TEM , BET, FT-IR, UV vis DRS , XPS , PL, and ESR measurements. The TFAP nanocomposites showed high degradation efficiency and excellent repeatability to TCH destruction. Among them, the (TFAP 1–1) nanocomposite has a lower bandgap energy (1.80 eV), a larger specific surface area (53.48 m 2 /g), and a lower electron-hole recombination rate. After 2.5 h of simulated sunlight irradiation, the degradation rate of the 200 mg/L (TFAP 1–1) nanocomposite (k = 0.0154 min −1 ) to 10 mg/L TCH reached 94.14%, which was much higher than that of the pure TiO 2 , TiOF 2 , and Ag 3 PO 4 samples. The experimental results demonstrated that TiO 2 was generated as an intermediate product during the chemical reaction process between Ag 3 PO 4 and TiOF 2 . Additionally, Ag nanoparticles were formed in the Ag 3 PO 4 /TiO 2 /TiOF 2 heterojunction system. An electric field was formed between Ag 3 PO 4 and Ag, enhancing the visible light absorption ability. Because of the Schottky potential difference, the electrons accumulate in Ag nanoparticles, thus enhancing the photocorrosion resistance of Ag 3 PO 4 . Additionally, the localized surface plasmon resonance (LSPR) effect of Ag nanoparticles greatly promoted the separation of carriers at the interface of the heterojunction. The LSPR effect leads to the co-oscillation of free electrons, which leads to the strong absorption of electromagnetic energy and enhances the photocatalytic performance of the heterojunction. The Ag@Ag 3 PO 4 nanocomposites acted as electron transport media for an all-solid-state Z-scheme TFAP heterojunction system. This study provides some in-depth insights into the structural design of Z-scheme heterojunctions, which have certain implications for other catalytic systems.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Long Cheng,Yang Zhang,Weikang Fan,Yuanhui Ji
As far as we know, biochar-based photocatalysts were rarely used in wastewater treatment, and their application was limited due to the catalyst agglomeration and low electron mobility efficiency. A novel biochar/2Zn 3 In 2 S 6 /WO 3 (BC/2ZIS/WO 3 ) photocatalyst was synthesized by the hydrothermal method, which has synergistic performance of adsorption and photocatalysis. BC, the carrier of the ZIS/WO 3 heterojunction , with a large specific surface area (1161.25 m 2 /g), good electrical conductivity, improved the efficiency of catalyst charge separation, and significantly enhanced the photocatalytic performance. The adsorption isotherm experiment showed that the maximum adsorption capacity of the BC/2ZIS/WO 3 for MB and RhB was 120.04 and 466.55 mg/g, respectively. Under the synergistic effect of adsorption and photocatalysis, the removal rates of MB and RhB reached 80.5% and 99%, respectively, which were significantly higher than that of the single heterojunction. Furthermore, through DFT calculations, trapping experiments, and HPLC-MS, the adsorption, degradation mechanism and pathways were elaborated. In general, this work provided important insights into the role of biochar in improving the photocatalytic degradation of pollutants, and guided the design of environment-friendly photocatalysts in the future.
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MATERIALS & DESIGN
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2022
·
IF 9.417
Huadong Fu,Yan Qin,Zhenyue Zou,Jiamin Fan,Chenyi Xue
The interlaminar strength of polymer matrix laminates significantly affects their performance. Z-pinning is an effective method for improving the interlaminar performance of laminates. However, it remains a challenge to improve the interlaminar performance of polymer matrix laminates at high temperatures. In this study, the interlaminar performance of silica/phenolic laminate after high-temperature pyrolysis was enhanced by using a boron carbide/silicon carbide fibre (B 4 C/SiC f ) composite pin. Experimental results revealed that the in-plane interlaminar shear strength (ILSS) of the pyrolyzed B 4 C/SiC f z-pinned laminates was above 3.0 MPa, which was 110% higher than that of the unpinned laminate. In addition, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis revealed that the combined effect of B 4 C and SiC fibres in the pin on the interlaminar performance of the laminate at high temperatures due to the enhancement in the interlaminar strength of the composite. Furthermore, the ILSS of the laminate increased when the z-pin content of the B 4 C/SiC f pins increased; however, when the content of the z-pin further increased, the vertical interlayer direction would happen the brittle fracture.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Boqiang Gao,Yu Pan,Qianqian Chang,Zhonghua Xi,Hu Yang
In this work, the sheet-like BiVO 4 with a higher exposure ratio of {0 1 0} facets was synthesized by the addition of TiCl 3 , and the ratio of (0 4 0)/(0 1 1) on {0 1 0}BiVO 4 was 2.85 times higher than that of normal decahedral BiVO 4 . Accordingly, the {0 1 0}BiVO 4 /Ag/CdS all-solid-state Z-scheme heterojunction was further constructed by photoreduction of Ag and chemical deposition of CdS on the well prepared {0 1 0}BiVO 4 successively. The performance and mechanism of {0 1 0}BiVO 4 /Ag/CdS in synergistic adsorption-photodegradation of fluoroquinolones (FQs) from water were investigated in detail. The adsorption-photodegradation could be divided into three processes: adsorption, surface degradation, and solution degradation, with the rate constants of 0.118, 0.029, and 0.012 min −1 , respectively. Accordingly, the adsorption was a rapid process due to the combined CdS in this composited photocatalyst had a high affinity to FQs to achieve an adsorption equilibrium on the surfaces<30.0 min. Besides, {0 1 0}BiVO 4 /Ag/CdS had a better separation efficiency of photogenerated electron-hole pairs than BiVO 4 /Ag/CdS, because the enriched {0 1 0} facets of {0 1 0}BiVO 4 caused more BiVO 4 /Ag/CdS ternary structure formed, and>90% photodegradation efficiency for five FQs ( C 0 = 0.062 mmol/L) was thus obtained within 60.0 min. The radical trapping and EPR results showed that holes and superoxide radicals were the main active species for FQs photodegradation. In summary, {0 1 0}BiVO4/Ag/CdS achieved an enhanced performance in synergistic adsorption and photodegradation of organic contaminants from water, and a talented photocatalyst was thus provided in water and wastewater treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Houfeng Zhang,Bojing Sun,Junjie Wang,Qian Zhu,Dongfang Hou,Chen Li,Xiu-qing Qiao,Dong-sheng Li
Optimize the separation and transport mechanism of photogenerated carriers in heterojunction composites, and make full use of the active sites of each material are key factors to enhance photocatalytic activity. Herein, we successfully synthesize defective CdLa 2 S 4 @La(OH) 3 @Co 3 S 4 (CLS@LOH@CS) Z-scheme heterojunction photocatalysts through a facile solvothermal method, which show broad-spectrum absorption and excellent photocatalytic activity. La(OH) 3 nanosheets not only greatly increase the specific surface area of photocatalyst, but also can be coupled with CdLa 2 S 4 (CLS) and form Z-scheme heterojunction by converting irradiation light. In addition, Co 3 S 4 with photothermal properties is obtained by in-situ sulfurization method, which can release heat to improve the mobility of photogenerated carriers, and also be used as a cocatalyst for hydrogen production. Most importantly, the formation of Co 3 S 4 leads to a large number of sulfur vacancy defects in CLS, and thus improving the separation efficiency of photogenerated electrons and holes, and increasing the catalytic active sites. Consequently, the maximum hydrogen production rate of CLS@LOH@CS heterojunctions can reach 26.4 mmol g -1 h −1 , which is 293 times than pristine CLS (0.09 mmol g -1 h −1 ). This work will provide a new horizon for synthesizing high efficiency heterojunction photocatalysts through switching the separation and transport modes of photogenerated carrier.
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Tianxiang Zhang,Tao Zhang,Hanping Fu,Li Feng,Qing Zhang,Shufen Ren,Jiayun Cheng,Qingshuang Liang,Xiufeng Xiao
Rational heterojunction interface construction and defect engineering have been regarded as significant strategies to enhance the photocatalytic performance of hydrogen peroxide (H 2 O 2 ) production. Herein, a novel 2D/1D BiOBr/WO 3 Z-scheme heterostructure with compact interface and rich oxygen vacancies (OVs) was successfully fabricated by an in situ -growth procedure. The rational design architecture and electronic structure allow the photocatalytic system to fully optimize light absorption, charge separation, and surface redox reaction . Benefited from synergistic effect of the formation of compact Z-scheme heterostructur and oxygen vacancies , the as-prepared BiOBr/WO 3 photocatalysts exhibit a greatly improved photocatalytic performance in the production of H 2 O 2 with a yield of 82.4 mM/h/g. We believe that this work provides a novel sight to develop high-efficiency photocatalyst via microstructure nanointerface control and defect engineering.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2023
·
IF 4.1
Tingting Du,Congzhi Hu,Yuye Li,Youyong Pang,Ming Li,Botian Liu,Ling Li,Yongping Liu,Huidan Lu,Bin Huang
This paper discusses the photocatalytic properties of Ag/Ag 3 PO 4 /Ti 3+ -TiO 2 composites. The nanostructured composites were synthesized by gas-phase hydrolysis, precipitation, and photoreduction methods. The photocatalytic performance of the photocatalysts was evaluated by degrading RhB and TC under visible light. The degradation efficiency of AT4 for RhB and TC reached 99.9 % and 78.2 % under visible light irradiation for 20 min and 2.5 min, respectively. The superior performance of AT4 is facilitated by the combined influence of the heterojunction and the SPR . The free radical capture test proved that h + and •O 2 − were the major reactive groups, and in conjunction with UV–vis DRS curves and Mott-Schottky curves, a probable reaction mechanism was proposed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xue Ma,Guowei Wang,Lifan Qin,Jue Liu,Bing Li,Yuanan Hu,Hefa Cheng
The transfer rate of photo-generated electrons is a critical factor that determines the photocatalytic efficiency of Z-scheme photocatalytic systems. Here, a novel Z-scheme g-C 3 N 4 -AQ-MoO 3 photocatalyst with anthraquinone (AQ) serving as an e – transfer channel for hydrogen production was proposed. Its enhanced photocatalytic activity is due to the accelerated transfer of e – in the form of charge inside AQ, which also suppresses the recombination of photo-generated e – and h + . In addition, the reduction area is significantly increased by the exfoliation of g-C 3 N 4 into thin layers. Due to the synergistic effect of rapid e – transfer and large reduction area, Z-scheme g-C 3 N 4 -AQ-MoO 3 has a high hydrogen production efficiency that can reach 2018 μmol/g with the presence of triethanolamine as a hole sacrificial agent after 180 min of simulated sunlight illumination. This work provides a new strategy to design and develop Z-scheme photocatalytic systems with excellent electron migration rates and high charge separation efficiency.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
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IF 4.019
Zhongwei Fan,Jingfei Luan,Changqing Zhu,Fuqiang Liu
The novel Z-scheme heterojunction photocatalyst g-C 3 N 4 /Ag 2 S/SnS 2 with Ag 2 S quantum dots as electron mediators was successfully synthesized by in-situ ion exchange reaction and self-peeling of g-C 3 N 4 . Compared with g-C 3 N 4 , SnS 2 or g-C 3 N 4 /SnS 2 , the photocatalyst g-C 3 N 4 /Ag 2 S/SnS 2 exhibited more excellent photocatalytic performance under visible light irradiation. The removal rate of methyl orange was 96.8% after 30 minutes visible light irradiation and the reaction rate constant reached 0.10225 min -1 . The enhanced photocatalytic activity could be attributed to the formation of Z-scheme heterojunction structure and the 2D layered structure. The electrochemical and photoelectric performance tests showed that the separation and transfer efficiency of the photogenic electron-hole pairs as well as the redox potential were significantly improved. Additionally, the quenching experiments showed that the superoxide radicals and holes were the primarily active species. Combined with other characterizations, the reaction mechanism of the g-C 3 N 4 /Ag 2 S/SnS 2 for degrading the target pollutant methyl orange under visible light irradiation was proposed.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 6
·3298-3310
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IF 3.591
Zhi-Yu Liang,Ren-Kun Huang,Ruo-Wen Liang,Dan-Hua Xie,Gui-Yang Yan
Nowadays, visible-light-driven photocatalysts are considered to be prospective candidates for solving the crisis of energy shortage and environment pollution. Herein, with the support of WO3 nanorods (NRs), which possess a fast electron transmission and low carrier diffusion, a series of direct Z-scheme ZnIn2S4/WO3 photocatalysts are exquisitely fabricated by an in situ self-assembly route with ZnIn2S4 (ZIS) and WO3 NRs. Photocatalytic activities towards both selective hydrogenation of aromatic nitro compounds and non-selective oxidation of organic compounds demonstrate that these as-fabricated heterostructured nanocomposites exhibit remarkably enhanced photocatalytic activities owing to the highly efficient separation of photogenerated electrons and holes. Furthermore, the characteristics of electron spin resonance (ESR) spectra clearly suggest that the as-fabricated nanocomposites follow the direct Z-scheme-dominated photoredox catalytic mechanism. Additionally, combining the results of ESR and X-ray photoelectron spectroscopy (XPS), it can be concluded that the photo corrosion of ZnIn2S4 is significantly postponed after integration with WO3 NRs. Finally, we will be greatly pleased if this work could afford a theoretical exemplification and synthetic strategy for rationally designing and utilizing direct Z-scheme photocatalysts.
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