ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 15
·43702-43713
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IF 5.8
Guo Jin,Sun Yihua,Luo Qiuzi,Zhang Jiangyu,Fang Liang
Innovative solar-driven heterostructure photocatalysts are promising for removing the organic contaminants in the water environment. In this work, a sequence of well-defined Z-scheme Ti-Ga co-doped ZnO/g-C 3 N 4 (TGZ/CN) heterostructure photocatalysts were developed via a simple sol–gel method and the single-phase dispersion method in order to realize the cooperative improvement from the Ti/Ga co-doping and construction of heterostructure. The synthesized samples were analyzed by a variety of characterization techniques, and the photocatalytic activity was assessed by photodegradation of methylene blue (MB) under visible light irradiation. Compared to the ZnO and g-C 3 N 4 , the TGZ/CN composite demonstrated higher photocatalytic performance for the degradation of MB indicating an efficient photocatalytic degradation rate of 95.4% in 105 min under visible light. Moreover, the TGZ/CN photocatalyst exhibited excellent stability after five cycles of MB photodegradation. Furthermore, the as-prepared composites’ possible photocatalytic mechanism was discussed in detail. The improved photocatalytic performance primarily resulted from the effectively reduced band gap of ZnO after Ti/Ga co-doping and the facilitated separation of photoexcited e − /h + pairs caused by the construction of Z-scheme heterojunction. This work offers novel insights in developing hybrids with highly efficient photocatalytic activity towards future environmental applications. Graphical abstract
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
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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Advanced Materials Interfaces
·
2022
·Vol. 10
·期 5
·2201627
·
IF 6.389
Xin Wang,Kaili Wu,Wei Cao,Kun Rui,Wenchao Wang,Ruixue Zhu,Jixin Zhu,Zhiping Yan
The intrinsic charge carriers’ recombination and excited states decay greatly suppress the active species survival and photo(electro)catalytic performance. Inspired by Z-scheme strategy, the polymeric nitrogen-rich carbon nitride/cadmium sulfide (g-C 3 N 5 /CdS) core–shell heterojunction is constructed to optimize photocatalytic performance. The optimal hydrogen production rate of g-C 3 N 5 /CdS heterojunction catalyst under visible light without adding extra cocatalyst is up to 7860 µmol h −1 g −1 , which is 3 and 71 times higher than that of pure CdS and g-C 3 N 5 photocatalysts, respectively. The femtosecond transient absorption spectroscopy is employed to observe the kinetic decay of carriers in the heterojunction, revealing the ultrafast charge trapping process (τ 1 = 52.3 ps) and long-lived excited states (τ 3 = 1109.2 ps) in g-C 3 N 5 /CdS photocatalyst. Meanwhile, density functional theory calculation results comprehensively suggest the promoted charge separation in heterojunction. Cost-effective Z-scheme g-C 3 N 5 /CdS photocatalyst in this work shows a great potential for sustainable and high-efficiency solar-to-H 2 conversion.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiaofei Fu,Junwu Tao,Zuming He,Yong Gao,Yongmei Xia,Zizhou Zhao
High-efficiency interfacial charge transfer is the key to achieve better spatial carrier separation, and thus to develop advanced heterogeneous photocatalysts for environmental remediation. However, It still remains a great challenge to design and exploit the effective charge transfer scheme. Herein, a novel Z-scheme In 2 S 3 /BiOBr with S−O covalent bonding was prepared by hydrothermal and subsequent thermal annealing methods. The obtained photocatalysts were systematically characterized and used for tetracycline hydrochloride degradation and Cr(VI) reduction in aqueous solution. As a result, the optimized In 2 S 3 /BiOBr heterostructure (IS/BOB-39) exhibited superior photocatalytic activities for tetracycline hydrochloride degradation and Cr(VI) reduction under simulated solar light irradiation compared with individual materials. The Z-scheme transfer mechanism was corroborated by trapping experiments, ESR and XPS analysis , which provided an effective transfer pathway for spatial separation of carriers. Moreover, the formation of chemical S−O bond between In 2 S 3 and BiOBr, which acted as a specific bridge to expediently transmit interfacial electrons, showed a synergistic effect with Z-scheme transfer model on the significantly enhanced photocatalytic performance. In addition, the In 2 S 3 /BiOBr heterojunction presented excellent cycle stability, resulting from the tight heterointerface. This work provides a promising approach to design and fabricate high effect Z-scheme heterojunction in wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Juanqin Xue,Long Shi,Peng Wang,Wen Cheng,Mingyang Long,Mengjiao Sheng,Qiang Bi
The coal chemical industry generates large quantities of volatile organic compounds (VOCs) and solid wastes. Within this work, porous semi-coke activated carbon (SAC) was produced from solid waste semi-coke (SC) powder. Through loading high performance photocatalysts onto SAC to efficiently degrade VOCs using synergistic effects of adsorption and photocatalysis, acheiving the resourcefulness of solid waste. The specific surface area of the prepared SAC can reach 619.27 m 2 .g −1 , which was effective against the adsorption of VOCs. An one-step hydrothermal method was used to load a 2D Z-scheme g-C 3 N 4 -Bi 2 WO 6 (NB) photocatalyst on a semi-coke activated carbon. The 50 wt% NB/SAC material degraded formaldehyde, benzene and toluene up to 93.6%, 84.4% and 78.8% in 130 min under visible light irradiation, being 6.09, 4.55 and 4.75 times higher than that of a single photocatalyst, respectively. The capture experiments showed that hydroxyl radicals (⋅OH) and superoxide radicals (⋅O 2 – ) were the active species in the degradation pathway. The material maintained a high degradation performance of 84.8%, 79.6% and 74.0% even after five cycles. In this study, the mechanism of using SAC as a substrate to enhance performance in photocatalytic degradation was described. The results of this study offered new insights into the resourcefulness of solid waste and the effective degradation of VOCs. It also offered a promising theoretical foundation for the exploitation and utilization of high-performance photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
·
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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CHEMICAL ENGINEERING JOURNAL
·
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
·
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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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
·
IF 5.141
Haixian Shi,Dengchong Feng,Hanmei Li,Dingshan Yu,Xudong Chen
Herein, a novel all-organic Z-scheme hydrogen-bonded organic frameworks (HOFs)/g-C 3 N 4 nanosheets (CNNS) heterojunction photocatalyst is synthesized through an in-situ electrostatic method. Characterization and density functional theory studies together verify that the band structures with staggered alignment between HOFs and CNNS can induce a rapid Z-scheme interfacial charge-transfer pathway. Combing the complementary advantages of HOFs and CNNS, the fabricated Z-scheme HOFs/CNNS heterojunction inhibits photoinduced electron-hole recombination and more charge carriers are accumulated to produce highly reactive substances (•O 2 – , •OH and h + ). In addition, the superior hydrophilicity of HOFs can enhance the interaction of HOFs/CNNS heterojunction with water molecules and methyl orange pollutant, which is beneficial to boosting photocatalytic activity . Therefore, in contrast to inactive pure HOFs, the novel Z-scheme HOFs/CNNS heterojunction exhibits a high photocatalytic hydrogen evolution rate of 4450 μmol h -1 g −1 with an apparent quantum efficiency (AQY) of 22 % at 450 nm, which is approximately 11 times higher than that of pure CNNS. Additionally, such heterojunction enables 100 % degradation of methyl orange within 60 min.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 34
·16584-16592
·
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
·
2022
·
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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Tongtong Zhang,Yuqi Wang,Xin Xie,Yanning Shao,Yuhao Zeng,Siyu Zhang,Qishe Yan,Zhongjun Li
A dual Z-scheme carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C 3 N 4 deposition on the surface of Bi 2 O 3 and BiOI and a higher charge transfer rate of carbon-bridged g-C 3 N 4 , which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C 3 N 4 and bismuth-based catalysts.
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