RSC Advances
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2017
·Vol. 7
·期 78
·49446-49454
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IF 3.108
Pan Yue,Zhi-Xian Wei,Xu-Hong Wu,He-Dan Zhang,Fan Ye
In order to identify a high-efficiency solar-light-driven magnetic photocatalyst, a series of powders such as perovskite La0.7Sr0.3MnO3, yeast-assisted La0.7Sr0.3MnO3 (Y-La0.7Sr0.3MnO3), Y-La0.7Sr0.3MnO3/TiO2 and TiO2 were prepared and characterized by photoluminescence spectroscopy (PL), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption–desorption (N2-BET). The magnetic and photocatalytic properties of the powders were also investigated. The experimental results show that, when the content of TiO2 in the composite Y-La0.7Sr0.3MnO3/TiO2 is 3.51 wt%, the Y-La0.7Sr0.3MnO3/TiO2 exhibits stronger absorption in the UV-Vis light region. A composite p–n heterojunction was formed and had the lowest photoluminescence (PL) intensity, indicating a higher separation efficiency of photogenerated charge carriers and an enhancement of the photocatalytic activity of the Y-La0.7Sr0.3MnO3/TiO2 composite. Under solar irradiation, Y-La0.7Sr0.3MnO3/TiO2 shows an obvious synergistic photocatalytic effect on orange (MO) wastewater, and the synergetic index is calculated to be 1.79. Furthermore, it still exhibits high photocatalytic activity after being reused 8 times. Moreover, Y-La0.7Sr0.3MnO3/TiO2 displays soft ferromagnetic behavior, has much higher magnetization and lower coercivity and remanence. Therefore, Y-La0.7Sr0.3MnO3/TiO2 can be recycled by an external magnetic field more easily and can be used repeatedly. Radical trapping experiments confirmed that the main reactive oxygen species (ROS) involved in the process of the photocatalytic reaction are the superoxide radical anion (˙O2−), hole (h+), and hydroxyl radical (˙OH), and the sequence of the contributions of the ROS to the photocatalytic activity of the composite is ˙O2− > h+ > ˙OH. Furthermore, the photocatalytic mechanism of Y-La0.7Sr0.3MnO3/TiO2 is proposed in this work.
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
FIBERS AND POLYMERS
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2020
·Vol. 21
·期 4
·717-723
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IF 1.797
Duan Yinli,Ma Jing,Liu Jiao,Qiang Liangsheng,Xue Juanqin
In this paper, a facile and efficient method was performed to prepare the thermo-responsive Poly(N-isopropylacrylamide)/TiO 2 (TiO 2 /PNIPAM) with the dispersing of TiO 2 nanoparticles into PNIPAM. The structures of nanoparticles and the grafted polymer were confirmed by X-ray diffraction (XRD), Raman spectra, Fourier transform infrared spectra (FT-IR) and Dynamic Light Scattering (DLS). The interactions between the two components were studied by X-ray photoelectron spectroscopy (XPS), and the morphology of TiO 2 /PNIPAM was observed by scanning electron microscopy (SEM). The results showed that TiO 2 exhibited homogeneous dispersion, without sacrificing the properties of TiO 2 . Furthermore, The composite was used to photocatalytic degradation of Methylene blue (MB). The highest MB removal efficiency is 86.3 %. The photocatalytic activities above or below the lower critical solution temperature (LCST) of PNIPAM was also investigated. The experiment results show that the existence of PNIPAM contributed not only the thermo-responsive abilities to TiO 2 , but also the enhanced photocatalytic activities to TiO 2 . In addition, the corresponding mechanism of enhanced photocatalytic activity was proposed. The results manifest that the well-designed TiO 2 /PNIPAM is a promising candidate in wastewater treatment application.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2022
·Vol. 18
·期 1
·e2840
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IF 1.777
Qiaolin Ren,Ruirui Yang,Junying Li,Wenjun Yan,Zhongde Wang,Ailian Wu
Electrocatalytic oxidation technology has been proved as an efficient method for degradation in organic wastewater. The service lifetime and degradation efficiency of the electrode, one crucial struggle, limits the broad application of electrocatalytic oxidation technology. Herein, a Ru/Ir doped TiO 2 electrode with a long service lifetime was developed. Accelerated life experiment showed that the service life of an electrode was 33 h when the concentration of sulfuric acid was 1 M and the current density was 2000 mA·cm −2 . The influence on the phenol degradation was evaluated by researching the operating parameters. In particular, the possible mechanism of phenol removal at different pH is elucidated. It is found that acidic environment is favorable for chemical oxygen demand (COD) and phenol removal at a current density of 20 mA·cm −2 , pH 3 at 800 ppm NaCl, which can make the removal rates of phenol and COD with Ru/Ir doped TiO 2 anode up to 97.21% and 100%. In addition, it was demonstrated that the hydroxyl radicals play a foremost role in the degradation of phenol. Given the well stability and high service life, the Ru/Ir doped TiO 2 electrode holds promise for further industrial application in wastewater treatment.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 2
·1-10
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IF 2.8
Gao Lingxiang,Zhang Hao,Liu Wen,Zhang Shulong,Xie Zunyuan
In this study, electro and magneto dual response of TiO 2 @Fe 3 O 4 composite nanoparticles is realized by situ-generating Fe 3 O 4 , which was synthesized by FeCl 3 and FeSO 4 , on rose-like TiO 2 pore in virtue of facile hydrothermal reaction. Morphology, structure and physical properties, such as dielectric constant and magnetic conductivity, of the TiO 2 @Fe 3 O 4 composite particles were characterized. The particles were dispersed in hydrous elastomer to measure their electro and magneto responsive property by the scanning electron microscopy of micro structure of hydrous elastomer and dynamic mechanical analysis that reflected by the sensitivity of the increase in storage modulus ( f = ∆ G / G ) of the hydrous elastomer cured in the absence/presence of external field. The one of the TiO 2 @Fe 3 O 4 particles consisting of the ratio of TiO 2 :Fe 3 O 4 to 2:1 has the highest electro and magneto dual responsive effect that reaches 62%, which is far higher than TiO 2 with only 15%. This work provides a new substance shows the excellent performance of electro and magneto dual response to applied in smart material field.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Jiaqi Li,Mingfei Wang,Jiamin Qi,Xueqian Wang,Langlang Wang,Fei Wang,Kai Li,Yixing Ma,Ping Ning
Hydrogen cyanide (HCN), a common toxic and hazardous air pollutant in industrial exhaust, catalytic hydrolysis of HCN has been the focus of air pollution control research. In this study, a catalyst material (La-TiO 2 ) with high catalytic hydrolysis activity for HCN was obtained by loading La 2 O 3 on the TiO 2 surface, which could realize the complete conversion of HCN at 150 °C with high selectivity of NH 3 and CO 2 . The relevant characterization confirms that La 2 O 3 can be uniformly distributed on the TiO 2 , which can adjust the acid-base structure of the catalyst surface and induce the generation of multi-hydroxyl structures in TiO 2 . On this basis, the combination of in-situ technique and density functional theory (DFT) calculations confirmed that the loading of La 2 O 3 prompted the La-TiO 2 catalyst to activate H 2 O to generate surface hydroxyl groups (-OH), which further enriched the hydroxyl groups on TiO 2 and substantially improved the hydrolysis activity and NH 3 selectivity of the catalyst. And the study confirms that the hydroxyl-rich environment easy combine with the reaction intermediate (formic acid) to generate CO 2 and H 2 O, which accelerated the reaction rate, thus improving the conversion efficiency of HCN and lowering the catalytic conversion temperature. In addition, O 2 can continuously consume the remaining hydrogen atoms after the dissociation of H 2 O to generate hydroxyl groups again, thus effective enhancing catalyst stability. This study provides new theoretical support for the catalytic hydrolysis of HCN and new insights and ideas for the design and development of catalysts for the catalytic hydrolysis of HCN.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 7
·1078
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IF 3.9
Ze Hong,Jingying Ouyang,Jiaxin Li,Han Zheng,Ying Liu
Multi-heterojunctions are more promising than single heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assembled gold nanoparticles/oxygen-deficient (anatase/B-phase) TiO2multi-heterojunction microspheres using spray pyrolysis and focused on their contact mode-governed photocatalytic activity. The results reveal that using oxygen-deficient (anatase/B-phase) TiO2microspheres as building blocks could significantly enhance the absorption of visible light and the photocatalytic activity of a gold–TiO2system toward the photocatalytic carbon monoxide oxidation. Furthermore, loading gold nanoparticles onto B-phase TiO2could facilitate a more prominent enhancement of activity than that of pure B-phase TiO2, benefiting from the two-electron reduction of oxygen at the interface of TiO2/Au. Meanwhile, the high crystallinity of B-phase TiO2microspheres allows for a gold loading amount of 1 wt% in the gold/(anatase/B-phase) TiO2system, which is 1.67 times more active than pure B-phase TiO2microspheres, in the photocatalytic oxidation of carbon monoxide to generate carbon dioxide.Keywords:photocatalytic carbon monoxide oxidation;B-phase TiO2;oxygen-deficient;microspheres
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 24
·30243-30253
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IF 3.056
Xu Wenqing,Gao Lei,Yang Yang,Zhu Tingyu,Qi Guisheng
The deposition of NH 4 HSO 4 on catalysts is one of the key issues for selective catalytic reduction of NO x . In this study, NH 4 HSO 4 was preloaded on catalysts, and the effects of MoO 3 and CeO 2 doping on the decomposition and reactivity of NH 4 HSO 4 on V 2 O 5 /TiO 2 catalysts are studied. The results show that the introduction of MoO 3 and CeO 2 significantly promoted NO x conversion on the V 2 O 5 /TiO 2 catalysts. Doping with MoO 3 could effectively enhance the S and H 2 O resistance of the catalysts. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicate that it is the strong chemical interactions between NH 4 HSO 4 and the catalysts that are adverse to the decomposition of NH 4 HSO 4 . However, doping with MoO 3 apparently inhibits these interactions, which significantly decrease the decomposition temperature of NH 4 HSO 4 . In situ FTIR experiments show that the NH 4 + in preloaded NH 4 HSO 4 could react with gaseous NO on catalysts, and doping with MoO 3 could facilitate the reaction rate.
研究领域:
环境科学
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催化化学
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DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2014
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IF 3.32
Fuhai Yu,Yanjie Wang,Hailian Tang,Yanjie Zhang,Changzi Jin,Xin Liu,Mingrun Li,Junhu Wang
The synergic effect of cation doping and phase composition for the further improvement of the photocatalytic activity of TiO 2 under visible light is reported for the first time. Fe 3 + and Sn 4 + co-doped TiO 2 with optimized phase composition were synthesized through a simple soft-chemical solution method. The visible-light-driven photocatalytic activity of Fe 3 + and Sn 4 + co-doped TiO 2 was 5 times of that of Evonik P25 TiO 2 using degradation of methylene blue as model reaction. The synthesized photocatalysts were characterized by powder X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, 119 Sn Mössbauer spectroscopy, and X-ray absorption fine structure spectroscopy. It is indicated that Sn 4 + doping can facilitate the phase transition from anatase to rutile. The different ratios of anatase and rutile can be achieved by tuning the amount of Sn 4 + doped into the lattice. Furthermore, the doping of Sn 4 + into TiO 2 lattice can stabilize the phase composition when Fe 3 + is co-doped. In the Fe 3 + and Sn 4 + co-doped TiO 2 , Sn 4 + is mainly used to tune and stabilize the phase composition of TiO 2 and Fe 3 + acts as a doping cation to narrow the band gap of TiO 2 . Both band gap and phase composition of TiO 2 can be tuned effectively by the simultaneous introduction of Fe 3 + and Sn 4 + . The synergic effect of optimized phase composition (anatase/rutile = 25/75) and narrowed band gap should be the two main reasons for the promoted photocatalytic activity of TiO 2 under visible light.
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
ENVIRONMENTAL TECHNOLOGY
·
2021
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IF 3.247
Min Xiaobo,Li Xinyu,Zhao Jie,Hu Xiaoxian,Yang Weichun
Aiming at exploring an effective photocatalytic adsorbent for organic dye removal, a series of heterostructured TiO2@HKUST-1 photocatalysts, by incorporating HKUST-1 with different TiO2 nanoparticles loading, were prepared by single-step hydrothermal method. The morphology and surface characteristics of the as-prepared TiO2@HKUST-1were analyzed using SEM, HRTEM, XRD, FTIR, UV–vis DRS, and Photoluminescence techniques. The adsorption-photocatalytic degradation of the model dye methylene blue (MB) on the catalysts was investigated. It was indicated that the introduction of a certain amount of TiO2 on the surface of HKUST-1 could improve the transfer and separation of the photogenerated charge carriers, resulting in the enhanced photocatalytic activity. The optimal 0.02TiO2@HKUST-1 exhibited the highest MB removal rate with about 4.4 and 19.3 times as high MB removal efficiency as that of HKUST-1 and TiO2, respectively. Heterostructured TiO2@HKUST-1 materials for the removal of MB involved the integrated adsorption and visible light photocatalysis. Meanwhile, the composite exhibited good reusability in the process of cyclic experiments. Therefore, this work provides a potential MOF-based photocatalytic adsorbent for organic dye removal.
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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Min Chen,Honghong Wang,Xueyan Chen,Fei Wang,Xiaoxiao Qin,Changbin Zhang,Hong He
Photocatalysis is regarded as a promising method for indoor formaldehyde (HCHO) removal, and there remains a strong demand for the development of highly efficient photocatalysts for HCHO oxidation under visible light. Herein, by grafting nano CuO x clusters onto TiO 2 , the higher performance is achieved over Cu-TiO 2 for the photocatalytic oxidation of HCHO under visible light compared with the typical photocatalysts N-TiO 2 and g-C 3 N 4 . It is found that the presence of water greatly promotes the activity of HCHO oxidation on Cu-TiO 2 . The characterization results indicate that the CuO x clusters on TiO 2 exhibit high redox reversibility between Cu (II) and Cu (I) and greatly facilitate the migration of electrons. The mechanism of photocatalytic oxidation of HCHO was explored by using in situ DRIFTS measurements and DFT calculations. It is shown that HCHO is firstly oxidized to dioxymethylene (DOM), and then DOM is transformed into formate species under visible light irradiation. DFT calculations results indicate that the OH species are responsible for surface formate decomposition, which is the rate-determining step, while O 2 − radical is not active in formate decomposition. Our findings improve the understanding on the photocatalytic oxidation of HCHO, and the Cu-TiO 2 catalyst is a promising candidate for practical application in indoor air purification.
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
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Yuebin Yang,Hui Xu,Shanxing Wang,Yuanfu Deng,Xianying Qin,Xusong Qin,Guohua Chen
Li-ion batteries have held a dominant position in the energy storage area for decades. However, due to the limitation of its chemistry , the energy density of Li-ion batteries is limited to ∼300 W h kg −1 . In recent years, more attention has been paid to the Li-S batteries that are environmentally friendly, cost-effective and high energy density (theoretical value of cathode: ∼2600 W h kg −1 ). In this study, carbonized polydopamine (C-PDA)-coated hollow carbon nanofibers (CNFs) with TiO 2 nanoparticles interspersed in the void space between the CNF skeleton and carbon coating layer were subtly designed. The C-PDA/TiO 2 /CNF composite (CTC) was integrated with the commercial separator as a polysulfide filter to achieve high-performance Li-S batteries. It is reveals that the CTC coating layer could effectively filter and reactivate the dissolved polysulfides to achieve a stabilized sulfur-based cathode. The Li-S battery assembled by this integrated separator and the regular cathode (sulfur/Ketjen black) with 72.7 wt% of sulfur achieved a high specific capacity and low decay rate (632.5 mAh g −1 at the first cycle and 0.06% per cycle) at 2.0C for 500 cycles. These good results indicate that the C-PDA/TiO 2 /CNF-modified separator could be a promising separator candidate for high performance Li-S batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 151
·期 7
·1961-1975
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IF 2.482
Wei Congcong,Zhang Wei,Wang Xinpeng,Li Aihong,Guo Jianping,Liu Bo
Abstract Here, g-C 3 N 4 /TiO 2 photocatalysts with mesoporous structure and intimate interfacial connection were synthesized via the facile pyrolysis of g-C 3 N 4 /MIL-125 composites. The photocatalytic H 2 evolution reaction was performed to examine the photocatalytic activity of obtained photocatalysts. Under the UV–vis light irradiation, the average H 2 evolution rate of g-C 3 N 4 /TiO 2 sample with optimal g-C 3 N 4 loading content (4.12wt%) was most increased by up to 0.606 mmol·g −1 ·h −1 , a value which transcended that of as-prepared g-C 3 N 4 (0.138 mmol·g −1 ·h −1 ) and mesoporous TiO 2 (0.244 mmol·g −1 ·h −1 ) by a factor of 4.41 and 2.48, respectively. The improvement in photocatalytic activity of g-C 3 N 4 /TiO 2 composites was explained by the synergistic effect between large specific surface area, decreased energy band gap and intimate interface contact. This study demonstrated a new approach for the preparation of binary mesoporous heterojunction photocatalysts. Graphical Abstract
研究领域:
材料科学
·
光催化
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DOI
高影响因子
危险品化学品经营许可证（带存储）