SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Chenlu Liu,Jingjing Xu,Junfeng Niu,Mindong Chen,Yonghui Zhou
This paper introduces a Z-scheme Ag 3 PO 4 /Bi 4 Ti 3 O 12 heterojunction composite photocatalyst prepared by an in-situ growth method. The photocatalytic properties of the prepared samples under visible light irradiation were studied by degrading sulfamethoxazole (SMX). The results of photocatalytic experiments and cycle experiments showed that Ag 3 PO 4 /Bi 4 Ti 3 O 12 -20% composite exhibited much better photocatalytic activity and stability than pure Ag 3 PO 4 and pure Bi 4 Ti 3 O 12 . The capture experiment results showed that h + is the main active substance in the process of SMX degradation. In addition, we proposed a possible photocatalytic mechanism based on the results of experiment and characterization. The formation of a direct Z-Scheme photocatalytic system promoted the separation of carriers, thereby improving the stability and activity of the composite samples.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuting Qian,Wenrou Tian,Jun Han,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
Catalytic oxidation of HCHO is often limited by the serious recombination of carriers in photocatalysts and the high cost of thermal catalysts based on precious metals. Herein, Bi 4 Ti 3 O 12 nanosheets enriched with bismuth vacancies were synthesized and decorated by UiO-66-NH 2 to obtain VBiTO@NU-66 for efficient removal of HCHO via piezocatalytic oxidation. The Bismuth vacancies in VBiTO enhanced the asymmetry of the crystal structure and introduced the atomic-level channels for energy and electron transfer. After loading UiO-66-NH 2 , the adsorption ability was substantially improved by the formation of Schiff-base covalent bonds between HCHO and –NH 2 . Under the joint action of adsorption and piezocatalysis, piezocatalytic oxidation rate of 300 mg/m 3 HCHO by VBiTO@NU-66 was as high as 95.1% within 3 h, which was 6 times of that of pure BiTO nanosheets. This work offers a novel tactics for the efficient purification of gaseous environmental pollutants.
研究领域:
环境科学
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材料科学
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催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 20
·14328-14336
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IF 2.993
Meng Alan,Xing Jing,Guo Wenlong,Li Zhenjiang,Wang Xiaomei
Porous composite nanofibers consisted of cubic Bi 12 TiO 20, and orthorhombic Bi 4 Ti 3 O 12 with pore size of 5–10 nm have been successfully synthesized by combining electrospinning with calcination for photodegrading methyl orange (MO). Calcination temperature has a great effect on the ratio of Bi 12 TiO 20 and Bi 4 Ti 3 O 12 and their morphology, which in turn affects the photocatalytic property of the products. MO was almost completely degraded over the as-prepared samples obtained under the optimizing calcination temperature of 500 °C after irradiating for 40 min under simulated sunlight. Besides, cycle and regeneration experiments show that the porous Bi 12 TiO 20 /Bi 4 Ti 3 O 12 composite nanofibers possess fine cycle stability and regeneration ability, after the regenerative photocatalyst was recycled twice, 91% of the MO was degraded. Based on the characterization results, the mechanism of the improvement in photocatalytic property of Bi 12 TiO 20 /Bi 4 Ti 3 O 12 composite nanofibers was also investigated, and h + played a major role in the photodegradation of MO. In addition, the as-prepared Bi 12 TiO 20 /Bi 4 Ti 3 O 12 composite nanofibers show a certain capacity of photocatalytic hydrogen production under the simulated sunlight. This work not only provides a porous fiber with good photocatalytic activity, but also provides a reference for the preparation and performance study of other fibers.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
NANOTECHNOLOGY
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2025
·Vol. 36
·期 18
·185401
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IF 2.8
Chen Zhang,Ruipeng Hou,Shufang Chang,Rong Wu,Shunhang Wei
Cocatalysts generally serve as active sites accelerating carrier separation. However, when the hydrophilicity of photocatalyst itself is poor, the trapped electrons or holes on cocatalysts are difficult to react with reactants quickly. In this work, Bi4Ti3O12 nanosheets with excellent hydrophilicity was prepared and then thermally deposited Rh on their surface (Bi4Ti3O12(Rh)), and finally in-suit grew ZnIn2S4 on the surface of Bi4Ti3O12(Rh). Based on the results of photocatalytic performance and materials characterization, it was found that the Bi4Ti3O12(Rh) in the photocatalytic system could be considered as a special cocatalyst rather than formed heterojunction with the ZnIn2S4. Under visible-light irradiation, the Rh acted as an electron trapping site to conduct photogenerated electrons trapping from ZnIn2S4 to the surface of Bi4Ti3O12. This process not only further accelerated carrier separation, but also facilitated electrons reacting with water due to the excellent hydrophilicity of Bi4Ti3O12(Rh), thereby achieving enhanced photocatalytic H2 production performance in the absence of sacrificial agents.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Changming Zhang,Yaqi Wang,Xiaochao Zhang,Rongxian Wang,Lifang Kou,Jiancheng Wang,Rui Li,Caimei Fan
The increase of CO 2 adsorption and separation efficiency of photo-induced carriers are two crucial factors for achieving effective CO 2 reduction into solar fuels. Here, novel millimeter-level nitrogen modified resin-based activated carbon spheres (N-ACSs), as desired support to immobilize and tailor Bi 4 Ti 3 O 12 catalyst (Bi 4 Ti 3 O 12 /N-ACSs) for improving CO 2 photoreduction activities, have been constructed via simple suspension polymerization and impregnation method. The involved TG, FTIR, XRD, XPS, EA, SEM, EDS, N 2 adsorption/desorption, CO 2 adsorption, UV–vis DRS, MS, PC, EIS, PL spectra and in-situ FTIR were characterized. Bi 4 Ti 3 O 12 /N-ACSs displayed the highest photocatalytic CO 2 reduction activity to CO of 142.76 μmol/g under 8 h simulated sunlight irradiation in pure H 2 O phase, approximately 1.45 times and 1.24 times higher than that of pristine Bi 4 Ti 3 O 12 and Bi 4 Ti 3 O 12 /ACSs, respectively. The introduction of N-ACSs played four roles: (i) the increase of CO 2 adsorption, (ii) the red-shift of optical absorption range, (iii) the consummate separation and transfer of photo-induced carriers, (iv) more CO 2 active sites. Finally, the possible mechanism photocatalytic CO 2 reduction for Bi 4 Ti 3 O 12 /N-ACSs was proposed. Our findings should provide noteworthy promising strategy to immobilize powder photocatalyst on the surface of millimeter-level carbon spheres for achieving the high-efficient CO 2 adsorption and photoreduction to CO.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Kun Zhou,Wei Liu,Peifang Wang,Juan Chen,Huinan Che,Bin Liu,Yanhui Ao
Rational design of piezo-assisted photocatalytic systems for simultaneously efficient ultilization of solar and mechanical energy is promising but still challenging. In this work, a novel Bi 4 Ti 3 O 12 @C (BTO@C) Schottky heterojunction with high piezo-assisted photocatalytic performance is rationaly designed, and the degradation reaction rate constant k for RhB reaches 0.092 min −1 in 30 min. Experimental results and density functional theory (DFT) calculations show that C-layer is tightly coated on the surface of BTO. Furthermore, C-O covalent bonds , which act as electron transfer channels, are formed at the interface of BTO and C-layer. Meanwhile, the presence of piezoelectric potential field of BTO@C under piezo-assisted photocatalytic conditions further promotes the transfer of photogenerated electrons from BTO to C-layer, which synergistically contributes to the performance enhancement. This work provides a new idea for the design and development of efficient piezo-assisted photocatalytic materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 5
·2028-2035
·
IF 6.233
Dongfang Hou,Wei Luo,Yunhui Huang,Jimmy C. Yu,Xianluo Hu
Bi4Ti3O12 nanofibers with diameters of 50–100 nm have been fabricated for the first time through a simple and economical technique of electrospinning combined with subsequent calcination. The as-formed Bi4Ti3O12 nanofibers are porous and composed of inter-linked nanoparticles of 30–50 nm in size. They exhibit both enhanced visible-light-driven photocatalytic decomposition of rhodamine B (RhB) and favorable recycling capability. It is attributed to not only the macrostructure, such as the morphology, surface texture, and grain shape, but also the intrinsic structures of oxygen vacancies and surface adsorbed oxygen.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2022
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IF 8.008
Jiaxi Hu,Hongjie Song,Cheng Chen,Lichun Zhang,Mingxia Sun,Yi Lv
Cataluminescence as a highly efficient gas transduction principle has attracted wide attention among research in environmental monitoring and clinical diagnosis with increasing awareness of human safety. Nowadays, the development of innovation sensing systems and the construction of the sensing mechanism to improve the analytical performance of compounds remain a major challenge. Herein, we construct an advanced photoinduced thermocatalytic chemiluminescence (PI-TC-CL) gas-sensing system via the introduction of a Z-scheme heterojunction Ag3PO4/Ag/Bi4Ti3O12 to achieve higher efficient detection of H2S. The unique electron transport path of the Z-scheme heterojunction and the LSPR effect of Ag nanoparticles fascinate the generation of the photoinduced electron–hole pair on the surface of catalysts when stimulated by LED lamps and slow down the recombination of electron–hole pairs under thermal conditions. Thus, based on the cooperative effect of the Z-scheme heterojunction AgPO/Ag/BTO and PI-TC-CL system, we have successfully established an efficient H2S CTL detection system, which has a response three times higher than that on the traditional CTL system and even 45 times higher than that on BTO and ranges among the best of the state-of-the-art CTL performance in H2S detection with the linear range of 0.095–8.87 μg mL–1 and a limit of detection of 0.0065 μg mL–1. Besides, to explore the gas-sensing mechanism, the synergetic effects of photoinduction and thermal catalysis are investigated thoroughly via conductivity and electrochemical experiments. This research provides a new perspective of engineering highly efficient catalysts and ingenious sensor systems through designing the nanostructure of materials and synergism catalytic mechanism.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
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IF 5.3
Yuxuan Wang,Chenhui Qiu,Yujing Xie,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Using perovskite photocatalytic reduction of CO2 and H2O to produce hydrocarbon fuels offers an attractive method to solve the energy crisis and the greenhouse effect. Bi4Ti3O12 (BTO) has received much attention in the field of photocatalysis due to its unique layered structure, but it still faces many challenges such as weak photoresponse and severe photogenerated carrier recombination. In this paper, Bi4Ti3O12 nanosheets with different concentrations of surface oxygen vacancies (VO) and Ti3+ defect were prepared by the molten salt method and NaBH4 high-temperature reduction method (HBTO). Surface defects formed obvious carrier traps on the HBTO surface, reduced the recombination rate of photogenerated electrons and holes, and adjusted the band gap structure (from 3.09 to 2.62 eV), which improved the visible light utilization of HBTO. The decrease of photoinduced carrier recombination rate and the improvement of visible light response significantly enhanced the photocatalytic CO2 reduction activity of HBTO under visible light. The CH3OH yield with the optimized HBTO-4 (NaBH4:Bi4Ti3O12 = 1:5) was 4.90 μmol·g–1·h–1, which was about 3.5 times that of the original BTO. Meanwhile, the band gap structure, electronic density of states (DOS), and work function were calculated by the density functional theory (DFT). This study provided an effective strategy for designing and preparing perovskite photocatalysts rich in surface defects for the efficient conversion of solar energy.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2016
·Vol. 18
·期 38
·26530-26538
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IF 4.449
Chun Du,Donghai Li,Qinyu He,Junming Liu,Wei Li,Guannan He,Yinzhen Wang
Hybrid Bi12TiO20/Bi4Ti3O12 composites with different Bi : Ti molar ratios were successfully fabricated using a one-step solid-state calcination. These samples were characterized using X-ray diffraction, specific surface area analysis, scanning electron microscopy, high-resolution microscopy, selected-area electron diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflection spectroscopy, photoluminescence analyses, and photocurrent and electrochemical impedance spectroscopy. Some specified techniques were also used to investigate the photocatalytic properties and the formation of radical species under UV-vis irradiation. The composites provide an efficient pathway for photo-produced electrons and holes to diffuse and transfer to the exterior of the particles for photodegradation, because of the good contact between hybrid Bi12TiO20 and Bi4Ti3O12. Therefore, the hybrid Bi12TiO20/Bi4Ti3O12 can prolong the carrier lifetime as compared to any individual material (Bi12TiO20 or Bi4Ti3O12). In particular, the hybrid Bi12TiO20/Bi4Ti3O12 composite with a Bi : Ti ratio of 12 : 6 had the longest photo-generated carrier lifetime and produced the maximum amount of hydroxyl radicals during UV-vis irradiation; therefore, it demonstrated the best photo-catalytic properties. A Z-scheme mechanism was proposed to explain the hydroxyl radical yield and photodegradation.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 20
·17688-17702
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IF 2.22
Liu Jun,Hui Qian,Chang Meng-Jie,Cui Wen-Na,Xi Tong,Wang Lin-Da,Sun Meng,Yuan Bin,Ni Fu-Rong
Herein, novel fibrous Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 is constructed by a simple one-step methodology for photocatalytic degradation of RhB dyes. Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 hybrid fibers were facilely prepared by direct hydrothermal growth of MoS 2 nanosheets on electrospun Bi 4 Ti 3 O 12 nanofiber surface, during which rod-like Bi 2 S 3 was formed by in-situ ion exchange reaction between BTO and S source. The MoS 2 nanosheets with several-layer thickness uniformly are coated both on the BTO and Bi 2 S 3 surface. Remarkable enhancement of visible light absorption and photo-generated charge separation in Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 are achieved compared with the bare BTO nanofibers. By changing the weight ratio of Mo/S and the precursor dosage of MoS 2 , the optimized BM-150/250 sample presents 2.3 and 4.1 times higher of the photodegradation efficiency and apparent reaction rate constant, respectively, than that of pure BTO fibers after 120-min irradiation under visible light. The system pays an efficient pathway to establish ternary composite fibers providing high photocatalytic activity for other electrospun Bi-contained nanofibers.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Xue Xiao,Qiuhui Zhu,Jiapeng Hu,Yin Shen,Yu Huang,Yuanhao Wang,Chuanyi Wang
Photocatalysis is appealing in removing trace NO, but its efficacy is often deteriorated by H 2 O, which is ubiquitous in environment, and how to resolve this issue and elucidate the underlying mechanisms at the molecular-level are challenging. Herein, we report a full-spectrum Bi/Bi 4 Ti 3 O 12 catalyst modified with Bi-O vacancy associates via a steam-assisted chemical reduction process. The optimized structure demonstrates NO removal efficiency of 75.5 %, four times over its counterpart, Bi 4 Ti 3 O 12 (37.9 %). Based on positron annihilation spectra and theoretical studies, the enhanced activity is induced by Bi-O vacancy associates, which not only optimizes the photogenerated carrier dynamical behaviors but lowers the energy barriers for photocatalytic oxidation of NO. Importantly, the photothermal activity of the optimal sample exhibited a decline from 76.7 % (0 % RH) to 71.2 % (100 % RH), whereas its photoactivity (20°C) demonstrated a more pronounced decrease, dropping from 60.1 % (0 % RH) to 41.2 % (100 % RH). Therefore, humidity-resistant performance over the optimal sample is attributed to photothermal effect induced by in-situ precipitated Bi and multiple defects. Furthermore, the results of adsorption and desorption behavior of H 2 O and in situ DRIFTS suggest the photothermal-assisted desorption of surface-bound H 2 O can suppress the interactions of H 2 O and stable bidentate nitrate ( bi -NO 3 ⁻) by hydrogen bonds to generate monodentate nitrate ( m -NO 3 ⁻), thereby hindering the photodecomposition of m -NO 3 ⁻ to NO/NO 2 . This work elucidates the significance of photothermal effect in developing efficient photocatalyst for atmospheric NO purification in humid conditions.
研究领域:
环境催化
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材料科学
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大气污染控制
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物理化学
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纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）