RSC Advances
·
2018
·Vol. 8
·期 34
·19279-19288
·
IF 2.936
Sai Wang,Xuewen Xu,Han Luo,Chaochao Cao,Xiaoyu Song,Jianling Zhao,Jun Zhang,Chengchun Tang
SrTiO3/NaTaO3 (STO/NTO) heterojunction photocatalysts were successfully constructed by decorating NaTaO3 nanocubes with SrTiO3 nanoparticles via a hydrothermal method. The structure of the perovskites NaTaO3 and SrTiO3 bear some resemblance to each other, which increases the interface lattice match for promoting the migration of photogenerated carriers between the STO/NTO interfaces. In comparison to pristine NaTaO3 and SrTiO3 samples, the STO/NTO composites exhibited remarkably improved capacity for the degradation of rhodamine B (RhB) under ultraviolet (UV) light (λ < 400 nm) irradiation. Furthermore, the partial replacement of O2− by N3− in the TaO 6 octahedron narrowed the band gap of NaTaO3, which significantly enhanced the photocatalytic performance of the SrTiO3/NaTaO3:N (STO/NTON) heterojunction under visible light (λ > 400 nm). Finally, the possible band structures of the STO/NTO and STO/NTON photocatalysts were proposed, which indicated that an n–n type heterojunction was constructed with a staggered gap for fast separation of photogenerated electron–hole pairs.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Haiyu Luo,Junzhi Li,Lili Tang,Yanan Li,Nan Xu,Wenlan Ji,Pei Nian,Shihao Zhang,Yibin Wei
Photocatalytic technology with high oxidative activity has been considered promising for eliminating fouling of nanofiltration (NF) membranes when used in organic pollutant removal. Herein, we report a photocatalytic self-cleaning NF membrane composed by two dimensional Ti 3 C 2 T x MXene and NaTaO 3 nanoparticles with excellent permeability and antibiotics removal efficiency. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used to verify the successful preparation of the photocatalytic self-cleaning membrane. The membrane with the NaTaO 3 nanoparticles loading of 8 mg (NM-8) exhibited excellent rejection (>99.67%) and water permeability (90.79–112.50 L m −2 h −1 ·bar −1 ) for tetracycline hydrochloride (TC), ciprofloxacin (CIP), methylene blue (MB), and 2-mercaptobenzothiazole (MBT). The removal efficiencies of the membrane for TC, CIP, MB, and MBT during the photocatalytic degradation process were 75.18%, 70.13%, 90.04% and 93.12%, respectively. Moreover, the chemical and optical properties were investigated by zeta potential, water contact angle, and UV–vis spectrum. The mechanism of photodegradation of pollutants by the prepared NaTaO 3 @Ti 3 C 2 T x MXene membranes was further elucidated. This work not only deepens the construction of photocatalytic NF membranes using two dimensional materials, but also provides a new strategy for the efficient removal of antibiotics from wastewater.
研究领域:
环境科学
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材料科学
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污染控制
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Lingnan Qu,Junyu Lang,Shuwei Wang,Zhanli Chai,Yiguo Su,Xiaojing Wang
In this paper, WO 3 -wrapped NaTaO 3 nanospheres photocatalysts with different W/Ta molar ratios were successfully prepared via a facile hydrothermal method. The samples were characterized by X-ray diffraction, transmission and scan electron microscopy, X-ray photoelectron spectroscopy, FT-IR spectrum, UV−vis diffuse reflectance spectroscopy, and Barrett−Emmett−Teller technique. The photocatalytic activities for degrading tetracycline hydrochloride under visible light irradiation were examined. The results indicated that the as-prepared NaTaO 3 @WO 3 photocatalysts showed the obvious enhancement in the tetracycline hydrochloride degradation ratio, compared with the pure NaTaO 3 and WO 3 under visible light irradiation. The optimum percentage of NaTaO 3 @WO 3 composites with a 60.88% degradation rate was W:Ta = 0.3:1 in mole, which was mainly attributed to the effective separation of the photo-generated electron and hole as well as the expanding of the absorption edge to the visible region due to the spherical heterojunction by wrapping WO 3 on the surface of NaTaO 3 . The radicals trapping experiments demonstrated that there were multiple active species during the degrading process of TC. The possible mechanism of tetracycline hydrochloride degradation by NaTaO 3 @WO 3 composite was also proposed.
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
SENSORS AND ACTUATORS B-CHEMICAL
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2012
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IF 3.898
Ying Zhang,Yu Chen,Yupeng Zhang,Xin Cheng,Caihui Feng,Lihua Chen,Jingran Zhou,Shengping Ruan
This paper reports the humidity sensitive properties of NaTaO 3 nanocrystalline . The NaTaO 3 nanocrystalline was synthesized by a simple hydrothermal method , and characterized by X-ray diffraction and scanning electron microscope . Then NaTaO 3 humidity sensor was fabricated by coating the nanocrystalline materials on interdigitated electrodes. The device shows good impedance-RH (relative humidity) linearity, narrow hysteresis and rapid time response characteristic. The impedance decreases about three orders of magnitude when the relative humidity (%RH) increases from 33% to 95%RH. The maximum hysteretic value of the sensor is 1%RH and the response time is about 3 s in the operated humidity scope. Moreover, the sensing mechanism was discussed by the complex impedance spectra in detail. These results indicate the potential application of NaTaO 3 in humidity sensors.
研究领域:
材料科学
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传感器技术
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纳米材料
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电子器件
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2013
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IF 2.39
Yongyong Deng,Youjian Chen,Bingang Chen,Jianhua Ma
In this study, a series of p-CuBi 2 O 4 /n-NaTaO 3 heteronanostructures were synthesized with the grinding–annealing method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalysts exhibit enhanced photocatalytic activity for methyl blue dye degradation under visible-light irradiation. The highest photocatalytic degradation efficiency was observed when the sample calcined at 500 °C with 50 wt.% CuBi 2 O 4 content. On the basis of the calculated energy band positions, the mechanism of enhanced photocatalytic activity was discussed.
研究领域:
材料科学
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光催化化学
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环境功能材料
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纳米材料
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能源与环境技术
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2015
·
IF 1.964
Huanan Cui,Jianying Shi,Hong Liu
NaBiO 3 and Bi(NO 3 ) 3 were used to synthesize Bi-doped NaTaO 3 . The influence of the Bi chemical state on the photocatalytic activity was investigated using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and diffused reflectance spectroscopy to study the structure, chemical state and light absorption characteristics, respectively. The photocatalytic activity was evaluated by the H 2 evolution water splitting reaction. The monoclinic phase of NaTaO 3 remained intact for the two Bi-doped samples, but the Ta–O–Ta bond was distorted from 180° after Bi doping. XPS results indicated that Bi 3+ was doped into NaTaO 3 with the Bi(NO 3 ) 3 precursor, while Bi 5+ and Bi 3+ were doped into NaTaO 3 with the NaBiO 3 precursor. The two samples showed identical light absorption, where doping with Bi extended the light absorption to long wavelength light as expected. However, Bi 3+ doping did not promote the photocatalytic activity of NaTaO 3 , while Bi 5+ and Bi 3+ doping did. The distorted Ta–O–Ta bond from 180° due to doping with Bi was detrimental for charge carrier transfer in the photocatalytic process. In contrast, the vacancies or defects in the NaTaO 3 lattice induced by Bi doping for charge balance were beneficial for charge carrier separation. The opposing action of these two factors resulted in the activity of the Bi 3+ -doped sample being comparable with pristine NaTaO 3 . For Bi 5+ - and Bi 3+ -doped NaTaO 3 , a high concentration of defects was induced by the high valence Bi 5+ ion and this led to its higher photocatalytic activity. Our results indicated that charge carrier transfer is a priority factor in the photocatalytic process and the doping of a high valence ion in the ABO 3 structure is a way to promote the separation of charge carriers.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 10
·1178
·
IF 2.881
Min Zhang,Zhenjiang Li,Yunfei Zhao,Zhaofeng Wu,Jun Zhang,Linyu Yang,Shuying Wang,Shiqing Li
In this study, ultraviolet detectors based on NaTaO3/TiO2were fabricated with enhanced detection performance towards solar-blind (200–280 nm) light. A TiO2seed layer was introduced and served as a buffer layer between the fluorine tin oxide (FTO)-coated glass substrate and the TiO2film, which increased the adhesion between them. The periodic stability and photoelectric characteristics of the detectors were studied and analyzed. The detectors showed a high performance when illuminated by 265 nm and 254 nm UV light. At −15 V bias, the dark current of the detector was only 70 pA. Under the bias of −15 V and the illumination of 254 nm, the maximum photo-to-dark current ratio reached 20, and the response time was less than 300 ms. Moreover, the detector exhibited a fast response time and remained very stable after numerous testing cycles. These results demonstrate the potential application of NaTaO3/TiO2composites in UV detection.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Gang Liu,Huanghui Nie,Leiyang Zhang,Xinyu Zeng,Yazhong Zheng,Xinyu Chen,Xinran Wang,Kun Yu,Li Jin,Yan Yan
To acquire giant electric field-induced strain in non-Pb materials is attracting a great deal of attention in the past decade. In the current investigation, the crystal and domain structures as well as the electrical performances of (1- x ) (0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 )- x NaTaO 3 (BNBT- x NT) specimens were systematically studied to achieve enhanced strain. The introduction of NT makes the phase structure transit from rhombohedral-tetragonal to pseudo-cubic structure. The original domain structure of BNBT is destroyed, and the disorder degree of the local structure increases. Simultaneously, the remnant polarization, coercive field, and piezoelectric coefficients were significantly decreased. The transition from ferroelectric to ergodic relaxation can be effectively modified, thus lowering the transition zone to room temperature. Finally, the BNBT-3NT ceramics achieve marked strain coefficients at room temperature, with a maximum strain of 0.394% under 65 kV/cm and a d 33 * of 606 pm/V.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuehui Liu,Xiaobo Shi,Xuguang Liu,Xia Li
Nanocomposites of C–Ta 4+ co-doped NaTaO 3 and reduced graphene oxide (C-NTO/rGO) with highly efficient photocatalytic activity were fabricated by a one-step solvothermal reaction. The optimum composites C-NTO/3rGO (with 3 wt% rGO) exhibited superior photocatalytic activity for the degradation of RhB over a mono-component counterpart under visible light irradiation . The photocatalytic efficiency was found to be as high as 97% for 90 min. Both XRD and XPS characterizations indicated that the doping of carbon into the NaTaO 3 lattice leads to the reduction of Ta 5+ to Ta 4+ . Furthermore, the co-doping significantly narrows the band gap (about 2.8 eV). Photo-luminescence (PL), time resolved transient PL decay spectra and photo-current results confirmed that photo-induced hole-electron pairs can be effectively separated resulting from the introduction of rGO. The synergistic effect of a decreased band gap and highly effective separation of photo-generated electrons and holes may be responsible for the enhanced photocatalytic activity of the fabricated nanocomposites. Both h + and •OH active radicals were found to be the key factors for the photo-decomposition process of RhB over the nanocomposites, while •O 2 − was also involved to a smaller extent. A possible photo-degradation mechanism for C-NTO/rGO was proposed on the basis of the experiments results.
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
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yin Hu,Wei Chen,Fen Zhang,Lingling Wang,Xuanye Chen,Fei Han,Weiguo Song
Photocatalytic degradation of aqueous organic pollutant while hydrogen evolution has become an attractive and potential approach to address environmental pollution and energy shortages. The design of highly efficient photocatalyst and the mechanism study are the keys for this issue. For this purpose, a series of rare earth La doped perovskite NaTaO 3 were prepared by an easy solid-phase synthesis method. La doping changed the morphology, structure and physicochemical properties of NaTaO 3 crystal. More importantly, it also found that controllable La dopants formed a concentration gradient between the surface and bulk of NaTaO 3 crystal, which would cause a gradient of energy band structure. Noteworthy, 0.5La/NaTaO 3 was identified as the intermediate state with the La doping from A sites to B sites and from bulk to surface in NaTaO 3 crystal. It possessed a large La concentration gradient, leading to the better photoelectrochemical properties and photocatalytic performance than any other xLa/NaTaO 3 catalyst. For the photocatalytic reaction over 0.5La/NaTaO 3 , HCHO was partially mineralized and gradually converted to HCOOH due to the large energy barriers of the intermediate reaction steps, while H 2 was produced stably in the five recycle runs. The active species of • O 2 − , •OH and h + were detected by the control experiments with trapping agents, and • O 2 − was confirmed to be the dominant one in the photocatalytic reaction. On this basis, the possible mechanism was proposed to understand the photocatalytic system in depth.
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
RSC Advances
·
2016
·Vol. 6
·期 84
·80595-80603
·
IF 3.289
Yang Rong,Liang Tang,Yahui Song,Shengnan Wei,Zhaohong Zhang,Jun Wang
A new visible-light-sensitive photocatalyst, Er3+:Y3Al5O12/MoS2–NaTaO3–PdS, was prepared by hydrothermal, liquid boiling and deposition methods. The prepared photocatalysts were all characterized using an X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM). The photocatalytic activity of the prepared photocatalysts was evaluated via photocatalytic degradation of amaranth as a refractory pollutant with simultaneous hydrogen evolution under visible-light irradiation. Moreover, the effects of the visible-light irradiation time and molar ratio of Er3+:Y3Al5O12 and NaTaO3 on the photocatalytic capability of Er3+:Y3Al5O12/MoS2–NaTaO3–PdS were studied. The results show that the use of Er3+:Y3Al5O12 can improve the utilization ratio of visible light (solar light) for NaTaO3. The optimum ratio of Er3+:Y3Al5O12 and NaTaO3 is 0.45 : 1.00. In addition, a study of extended reusability shows that the prepared photocatalyst can be effectively recycled for three repetitive cycles without an apparent deactivation of the photocatalytic activity. A visible-light photocatalytic degradation mechanism of amaranth with simultaneous hydrogen evolution is also proposed.
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
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Hao Zhou,Qi Yin
The construction of efficient photocatalysts has received much attention in wastewater treatment . In this study, Nb-doped NaTaO 3 was prepared with different doping ratio by a facile hydrothermal method. The prepared catalysts were analyzed by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) theory, ultraviolet–visible diffuse reflectance spectroscopy. Then the synthesized catalysts were employed to degrade a model pollutant, methylene blue (MB), under a 250 W mercury lamp. The characterization tests confirm that Nb was successfully doped into the crystal structure of NaTaO 3 and the modified NaNb x Ta 1− x O 3 ( x is the doping ratio; x = 0.25, 0.5, 0.75) samples were formed, which were in regular cubic shapes just like pure NaTaO 3 . The synthesized NaNb x Ta 1− x O 3 ( x = 0.25, 0.5, 0.75) had improved specific surface area and narrowed band gaps compared with pure NaTaO 3 . In photocatalytic degradation experiments, NaNb 0.75 Ta 0.25 O 3 presented the best photocatalytic activity ascribed to the narrow band gap and the high surface area, degradating 95.7% of MB after 180 min of reaction, which was even twice the ability of pure NaTaO 3 . Besides, the effects of possible inorganic anions and cations in wastewater on photocatalytic degradation were investigated. Electron spin resonance (ESR) tests and capture experiments were also conducted and a possible photocatalytic mechanism was proposed. This work provides a direction for constructing superior NaTaO 3 -based photocatalysts to be widely utilized in environmental protection.
研究领域:
环境科学
·
材料科学
·
化学
✓ 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）