APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Sen-Wang Wang,Zhen-Hong He,Yue Tian,Zhan-Jun Zhu,Yong-Chang Sun,Kuan Wang,Weitao Wang,Yang Yang,Huan Wang,Zhao-Tie Liu
Photothermal CO 2 oxidative dehydrogenation of propane (CO 2 -ODHP) is an environmentally friendly and sustainable route for propylene production and CO 2 utilization. In the present work, we developed a Pt-GaN/SrTiO 3 dual-functional catalyst to facilitate the reaction. The catalyst achieved propylene and CO yields of 1 mmol·g cat -1 ·h -1 and 1.2 mmol·g cat -1 ·h -1 under photothermal conditions at 320 °C, surpassing the performance of previously reported catalysts. Additionally, control experiments and in situ DRIFTS analyses corroborated that GaN and Pt were primarily responsible for the activation of C-H and C O bonds, respectively, and the photothermal route worked via a distinguished intermediate for CO 2 activation in contrast to the thermal route. DFT calculations supported the reaction route involving the coupling direct dehydrogenation of propane and reverse water-gas shift reaction. The present work shines a light on the design of photothermal catalysts with dual functions, particularly for the activation of CO 2 and light hydrocarbons. Additionally, it proposes a strategy to initiate high-temperature reactions at relatively lower temperatures.
研究领域:
催化
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化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jiangping Jing,Zhuoyuan Chen,Yuyu Bu,Mengmeng Sun,Wenqiang Zheng,Weibing Li
SrTiO 3 is a promising material for the photoelectrochemical (PEC) cathodic protection technology due to its intrinsic band structure . Its disadvantage of light absorption only in the ultraviolet region can be effectively solved by Cr doping. The Cr dopant usually exists as two states of Cr 3+ and Cr 6+ , among which the latter one usually behaves as the trapping center for the photoinduced electrons and leads to the decrease of the PEC performance. In this paper, a hydrogen treatment process is performed on the Cr-doped SrTiO 3 to reduce the Cr 6+ . It is verified that hydrogen treatment reduces Cr 6+ to Cr 3+ , leading to the increase of the concentration of the charge carriers and the decrease of the charge transfer resistance. And also, hydrogen treatment induces the formation of oxygen vacancy , which leads to the negative shift of conduction band potential and the increase of the concentration of the charge carriers. The effect of the hydrogen treatment temperature is further studied in this work. Higher temperature will promote the reduction degree of Cr 6+ and increase the concentration of oxygen vacancy . However, hydrogen treatment with excessively high temperature will induce too high concentration of oxygen vacancy, which would act as the recombination centers of the photogenerated charge carriers, suppress the mobility conduction and thus lead to the decrease of the PEC performance. Therefore, benefiting from the Cr 6+ reduction and modification with appropriate concentration of oxygen vacancy, the Cr-doped SrTiO 3 with hydrogen treatment at 250 °C shows the optimal PEC cathodic protection performance in NaCl solution.
研究领域:
材料科学
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电化学
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光电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Kun Wang,Mingze Gao,Juncheng Fan,Jingjing Huo,Pengxiang Liu,Rui Ding,Peng Li
Infection and aseptic loosening caused by bacteria and poor osseointegration remain serious challenges for orthopedic implants. The advanced surface modification of implants is an effective strategy for addressing these challenges. This study presents a “pneumatic nanocannon” coating for titanium orthopedic implants to achieve on-demand release of antibacterial and sustained release of osteogenic agents. SrTiO3 nanotubes (SrNT) were constructed on the surface of Ti implants as “cannon barrel,” the “cannonball” (antibiotic) and “propellant” (NH4HCO3) were codeposited into SrNT with assistance of mussel-inspired copolymerization of dopamine and subsequently sealed by a layer of polydopamine. The encapsulated NH4HCO3 within the nanotubes could be thermally decomposed into gases under near-infrared irradiation, propelling the on-demand delivery of antibiotics. This coating demonstrated significant efficacy in eliminating typical pathogenic bacteria both in planktonic and biofilm forms. Additionally, this coating exhibited a continuous release of strontium ions, which significantly enhanced the osteogenic differentiation of preosteoblasts. In an implant-associated infection rat model, this coating demonstrated substantial antibacterial efficiency (>99%) and significant promotion of osseointegration, along with alleviated postoperative inflammation. This pneumatic nanocannon coating presents a promising approach to achieving on-demand infection inhibition and sustained osseointegration enhancement for titanium orthopedic implants.
研究领域:
生物材料
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纳米技术
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骨科
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生物医学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Cheng Cheng,Jian Wang,Zhihao Zhao,Changchun Chen,Sheng Cui,Yifeng Wang,Lin Pan,Yaru Ni,Chunhua Lu
Semiconductor catalyst with high photocatalytic activity can be exploited via heterojunction. In this study, a new S-scheme SrTiO 3 /porous ZnO composite was rationally devised, successfully prepared by utilizing a two-step pyrolysis of SrTiO 3 /ZIF-8, and analyzed by various characterization technologies including XRD, SEM, TEM, BET, XPS, PL, UV–vis DRS, and photoelectrochemical and DFT theoretical calculations. A porous structure, tight contact, and a heterojunction formed between SrTiO 3 and porous ZnO (ZnOT) can be observed by SEM and TEM images. BET testing indicates that the SrTiO 3 /porous ZnO composite (S3ZT) shows the highest specific surface area (30.37 m 2 /g). The band gap values (E g ) of SrTiO 3 and ZnOT are around 3.17 and 2.95 eV, which agree with those obtained from DFT calculations. Compared to other samples, the SrTiO 3 /porous ZnO composite (S3ZT) shows higher light absorption and lower transfer resistance as demonstrated by UV–vis DRS and EIS results. S3ZT presents a superior photocatalytic efficiency of 48.8% in degrading 5 mg/L methyl orange (MO) irradiated by 1 h UV–vis light, which are 7- and 1.5-fold higher than pristine SrTiO 3 and ZnOT, respectively. Moreover, based on Mott-Schottky theory, active species trapping experiments, XPS determination, and DFT calculations (energy band gap and work function), it was shown to be reasonable to utilize the S-scheme charge migration process for an explanation regarding the better photocatalytic activity of SrTiO 3 /porous ZnO composite. Overall, this work will provide an effective protocol for devising and preparing semiconductor photocatalysts with S-scheme heterojunction by utilizing the superior characteristics of MOFs.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 8
·2482-2489
·
IF 6.177
Nan Sun,Yong Zhang,Xinru Li,Yuhan Jing,Zhengdong Zhang,Yu Gao,Jianqi Liu,Honglin Tan,Xiaoming Cai,Jinming Cai
Copper-based photocatalysts have attracted considerable attention because of their great prospects in photochemical conversions. However, there are still challenges faced during the preparation of copper-based photocatalysts with have high catalytic efficiency and high stability. In this study, polyaniline (PANI) was doped in an ultra-thin graphitized polyacrylonitrile (g-PAN) layer (denoted as CI), and Cu nanoparticles (NPs) were wrapped in the CI layer encapsulated on SrTiO3 (STO), which is designed as an efficient and low-cost photocatalyst for photocatalytic hydrogen production under visible light irradiation. Benefiting from the unique CI layer structure, the optimized Cu@CI/STO photocatalytic hydrogen evolution rate obtained was 371 μmol g−1 h−1, which is higher than the hydrogen evolution rate of Cu@g-PAN/STO (265.25 μmol g−1 h−1). Moreover, the CI layer demonstrated a quasi-cocatalyst effect. The ultra-thin CI layer not only protects the Cu NPs from oxidation but also promotes charge separation, which distinctly boosts H2 evolution, as indicated by the photoluminescence emission spectra, EIS Nyquist diagram and Mott–Schottky diagram. In addition, the degradation rate of Cu@CI/STO is approximately 4-fold higher than that of Cu/STO in the photocatalytic degradation of 4-nitrophenol under visible light. This study delivers a new method to protect Cu NPs and demonstrates the prospect for the rational design of copper-based photocatalysts with high stability and efficiency.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Chenxi Zhang,Kai Yu,Yajun Feng,Yue Chang,Ting Yang,Ying Xuan,Da Lei,Lan-Lan Lou,Shuangxi Liu
The novel visible-light-driven 3DOM-SrTiO 3 /Ag/Ag 3 PO 4 ternary composites were fabricated and used as photocatalysts in the degradation of organic contaminants, including RhB, phenol , and MB. Through the XRD, SEM, TEM, DR UV–vis, XPS, PL spectroscopy, N 2 sorption , and photoelectrochemical measurement, the obtained 3DOM-SrTiO 3 /Ag/Ag 3 PO 4 ternary composites were well characterized. The effects of SrTiO 3 :Ag 3 PO 4 molar ratio and stop-bands of 3DOM-SrTiO 3 on the catalytic performance were systemically investigated. 3DOM-SrTiO 3 /Ag/Ag 3 PO 4 ternary composite photocatalysts exhibited notably enhanced activity compared with single 3DOM-SrTiO 3 and Ag 3 PO 4 catalyst. Among these ternary photocatalysts, S35A65(300) exhibited the most excellent photocatalytic performance under visible light irradiation, which could be mainly attributed to synergy effect of the notably improved separate efficiency of photogenerated electron-hole pairs and the suitable stop-bands of 3DOM-SrTiO 3 (300) material. Although the gradually reduced activity in cycling tests was obtained over S35A65(300) under visible light irradiation, an excellent durability could be achieved for S35A65(300) under UV–vis light irradiation. No obvious loss in photocatalytic efficiency was observed after six cycles for RhB degradation. The notably improved enhanced durability of 3DOM-SrTiO 3 /Ag/Ag 3 PO 4 ternary composites under UV–vis light irradiation could be mainly attributed to the Z-scheme mechanism of this ternary composite photocatalyst.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Meng Liu,Xiangyu Xu,Wanying Xiao,Yipeng Liu,Yongbo Cui,Haojie Zhang,Amin Ju,Bo Feng,Lijing Wang,Weilong Shi
Designing photocatalysts with a broad reaction to sunlight is crucial for efficient clean energy conversion. However, most catalysts reported so far can only respond to UV and visible light for photocatalysis, neglecting the utilization of near-infrared light, which accounts for almost 50 % of sunlight. In this study, we obtained Au nanoparticles (NPs) decorated porous hollow SrTiO 3 material rich in oxygen defects using an acid etching-assisted hydrothermal method. The formation of a Schottky heterojunction between Au and SrTiO 3−x with matched Fermi levels enhances the electron transfer ability of SrTiO 3−x . Additionally, Au NPs exhibit two types of surface plasma resonance (SPR) effects at 480 nm (transverse SPR) and 800 nm (longitudinal SPR in the near-infrared region) by absorbing specific photons emitted by SrTiO 3−x . The "hot" electrons of the photoexcited SPR state can be further injected into the CB of SrTiO 3−x . Furthermore, the local electromagnetic field around the SPR-enhanced Au NPs effectively promotes the excitation and transfer kinetics of photoelectrons, allowing more "hot" electrons to participate in the photocatalytic reaction. Besides, the unique hollow porous structure of the catalyst ensures multiple reflections of sunlight within SrTiO 3−x . As a result, the hydrogen production efficiency of Au-SrTiO 3−x under near-infrared (NIR) and UV–vis-NIR light irradiation reaches 850 and 3206 μmol h −1 g −1 , with apparent quantum efficiency of 6.4 % and 7.2 % at 820 nm and 420 nm, respectively. The possible photocatalytic mechanism was proposed based on thorough systematic experimental analysis and theoretical calculations.
研究领域:
材料科学
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光催化
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可再生能源
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纳米技术
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuhang Zhang,Jin Qian,Peifang Wang,Yuxuan He,Bianhe Lu,Sijing Tang,Kailin Xu
In this study, ternary magnetic nanocomposites (SrTiO 3 /CoFe 2 O 4 /rGO, SCG) doped with cobalt ferrite and loaded with rGO were successfully synthesized, and utilized to rapidly activate PMS to degrade LVF. After evaluating the efficacy of samples with different loading loads, SCG-1 (1 % wt rGO loading) was selected for further testing due to its optimal catalytic activity (degradation efficiency reached 87.4 % in 5 min). Quench experiments and electron paramagnetic resonance (EPR) analysis showed that SO 4 − , 1 O 2 , OH were the main active substance involved in LVF degradation. Based on the redox cycle of Co and Fe ions and the platform provided by perovskite and rGO, the reaction can be carried out quickly. The vulnerable sites and possible degradation pathways of LVF were further analyzed by density functional theory (DFT) calculation and LC-MS/MS analysis, and the developmental toxicity and ecological risk of intermediate products were determined based on toxicity assessment software (T.E.S.T). This study provided a new vision for realizing rapid antibiotic degradation in water environments and provided theoretical support for the subsequent research on novel nanomaterials.
研究领域:
环境科学
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纳米技术
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zheng Liu,Hong Ding,Huilun Xu,Hao Yang,Jiangshan Liu,Zhendong Zhang,Rui Xiao,Limin Liu,Ganjun Feng,Li Zhang
Eradicating the bacteria on the surface of titanium-based (Ti) implants and optimizing the local immune environment is urgently needed to minimize the clinical implantation failures. Here, an ultrasound (US)-responsive Ti implant aiming at killing bacteria is prepared by building strontium titanate (SrTiO 3 ) nanoarrays on Ti substrate through a multi-step hydrothermal method and the subsequent decoration of Au nanoparticles (Au NPs). As an n-type semiconductor, SrTiO 3 can combine with Au NPs to form a Mott–Schottky heterostructure. The results reveal that the built-in electric field of the M–S heterojunction composed of Au NPs and SrTiO 3 significantly promotes the separation of electrons and holes while reducing the bandgap. Under US irradiation, Au@SrTiO 3 generates a large amount of reactive oxygen species (ROS) to kill bacteria, meanwhile eliminating bacterial biofilms that adhere to the implant surface. Besides, Au NPs accelerate bone remodeling by modulating macrophage polarization toward inflammation-suppressive orientation. Also, SrTiO 3 and Au NPs synergistically directed the osteogenic differentiation. The implantation in vivo shows that continuously optimizing the osteogenic microenvironment can obviously accelerate the osseointegration of Ti implant. Transcriptomic analysis reveals the in vivo pro-osteointegration mechanism of heterostructured Au@SrTiO 3 nanoarrays on Ti implant.
研究领域:
纳米技术
·
生物材料
·
生物医学工程
·
牙科
·
骨科
·
抗菌治疗
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免疫调控
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Zhidong Wei,Jiawei Yan,Weiqi Guo,Wenfeng Shangguan
The light penetration effect will weaken the driving force of charge separation from phase to surface by the built-in electric field of nanoscale photocatalysts, like low-dimensional materials. Therefore, in this study, a novel nanoscale lamination catalyst design method was proposed using a polymeric carbon nitride (PCN)-nano polyhedral SrTiO 3 core-shell structure catalyst (PCN-SrTiO 3 ). The results showed that the nanoscale lamination effect could be generated by the formation of the N–Sr bond, which could regulate the built-in electric field of the PCN simultaneously. Moreover, detailed characterization indicated that the N–Sr bond, which facilitates the generation of N vacancies in PCN, could act as a novel channel for charge transfer. Both surface and interior core N-deficient PCN have been discovered, resulting in more positive and negative VB positions, respectively. Synchronously, the light absorption ability of the PCN-SrTiO 3 samples increased. Consequently, the enhanced photocatalytic overall water splitting could be ascribed to the synergism of the built-in electric field regulation caused by the N-Sr formation-induced nanoscale lamination effect, which was favorable for energy flow adaption on the spatiotemporal scale.
研究领域:
材料科学
·
光催化
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 6
·2427-2433
·
IF 8.307
Shangchun Lv,Mengxi Pei,Yuxiang Liu,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng,Feiyu Kang
Hydrogen production from overall water splitting using SrTiO3(Al)-based semiconductors is one of the most promising routes to address energy and environmental concerns. Noble metals are needed to accelerate water splitting by promoting the charge transfer and providing active sites. However, noble metal-based catalysts have high prices and rare resources. Herein, we demonstrate a strategy to construct highly active CoxP/SrTiO3(Al) for overall water splitting. Hydrothermal method followed by an ultrasonic process was applied to prepare CoxP dots, which were loaded on the whole surface of SrTiO3(Al) as bifunctional cocatalysts. Interestingly, the CoxP dots on the (110) planes of SrTiO3(Al) were partially oxidized for the OER reaction. However, CoxP dots on the (100) planes of SrTiO3(Al) for HER kept it as it was. The as-prepared CoxP/SrTiO3(Al) photocatalyst shows a stable HER rate of 1.36 mmol−1 h−1 and OER rate of 0.635 mmol−1 h−1. The strong interaction between CoxP and SrTiO3(Al) not only facilitates rapid charge separation but also provides a highly active site for overall water splitting. Our study provides a valuable method for constructing noble-metal-free SrTiO3(Al)-based photocatalysts.
研究领域:
材料科学
·
化学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 78
·49759-49768
·
IF 3.108
Chaorui Xue,Shengliang Hu,Qing Chang,Ying Li,Xi Liu,Jinlong Yang
Anodized TiO2 nanotube arrays have important applications in the area of photocatalysis and biomedicine. In this study, with the aim of improving the photocatalytic and biomedical properties of TiO2 nanotube arrays, we prepared both single and double layer walled TiO2 nanotube arrays and subjected them to hydrothermal treatment in strontium acetate solution. It was found that fluoride doped SrTiO3/TiO2 nanotube arrays could be formed after hydrothermal treatment without the failure of the single and double layer walled structure. In the case of fluoride doped SrTiO3/TiO2 nanotube arrays with a double layer walled structure, doping of fluoride induced a visible light response, formation of SrTiO3 benefited the separation of photogenerated electron–hole pairs, and the double layer walled structure led to an enlarged surface area. Due to the synergetic effect of above three factors, the fluoride doped double layer walled SrTiO3/TiO2 nanotube arrays demonstrated the highest photocatalytic activity under ultraviolet, visible and simulated solar light irradiation. The degradation rates of methylene blue solution are 0.13 h−1, 0.26 h−1 and 0.53 h−1 respectively. Moreover, ability to induce hydroxylapatite formation on the surface was also examined through an immersing test in simulated body fluid. The results indicated that SrTiO3, doped fluoride and a double layer walled structure could stimulate the hydroxylapatite formation by providing a larger number of hydroxyl ions, hydroxyl radicals and reactive initiation sites, thus the fluoride doped double layer walled SrTiO3/TiO2 nanotube arrays also exhibited the best ability to form hydroxylapatite on the surface.
研究领域:
光催化
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）