RSC Advances
·
2017
·Vol. 7
·期 42
·26136-26144
·
IF 3.108
Shujie Wang,Zhuan Yi,Xueting Zhao,Yong Zhou,Congjie Gao
We report a promising strategy for the preparation of nano-aggregation suppressed thin film nanocomposite (TFN) membranes via an in situ method. Tetra-butyl ortho-titanate (TBOT) was added to the organic phase to prepare the new TFN membranes (in situ TFN). The in situ addition of TBOT produced TiO2 nanoparticles in the polyamide layer during interfacial polymerization. In comparison with TFN membranes fabricated by the conventional method (ex situ TFN preparation), the nanoparticles in the in situ synthesized TFN membranes exhibited better dispersion, and more TiO2 nanoparticles were observed on the membrane surface. Surprisingly, at a rather low concentration of TBOT (250 mg L−1), the water flux of the in situ TFN membranes was increased by more than 50% in comparison with that of a pure polyamide membrane with negligible rejection loss, which was close to the performance of the sate-of-the art TFN membranes. The surface properties of the membranes were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), and contact angle analysis. Our results demonstrate that in situ generation of nano-additives can effectively suppress nano-agglomeration and improve the performance and surface features of TFN membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Jing Lu,Shengyan Tian,Xiaohui Lv,Zuohong Chen,Baiyang Chen,Xiaoshan Zhu,Zhonghua Cai
The impact of manufactured nanoparticles on the toxicity of co-existing pollutants in aquatic environments has raised increasing concerns. However, the toxicity of polycyclic aromatic hydrocarbons or metal ions in the presence of titanium dioxide nanoparticles (nTiO 2 ) to marine zooplankton has been rarely reported. In the present study, the impacts of nTiO 2 on the toxicity of phenanthrene (Phe) and cadium (Cd 2 + ) to Artemia salina , a model marine zooplankton, were investigated. Although nTiO 2 alone exerted a limited toxicity to A. salina within 48 h of exposure, nTiO 2 strongly altered the toxicity of Phe and Cd 2 + to A. salina . Compared with the individual toxicities of pollutants to A. salina , the toxicities of Phe and Cd 2 + increased by 2.0% and 12.2%, respectively, in the presence of 5 mg/L nTiO 2, but decreased by 24.5% and 57.1%, respectively, in the presence of 400 mg/L nTiO 2 . These concentration-dependent impacts of nTiO 2 on the toxicity of Phe or Cd 2 + might be attributed to the concurrent functions of several interrelated factors including the adsorption of pollutants on nTiO 2 , the nTiO 2 -faciliated bioaccumulation of pollutants, the limited gut volume in organisms, and the aggregation and sedimentation behaviors of nTiO 2 . These results presented in the study could help understand the effects of manufactured nanomaterials in marine environments.
研究领域:
环境科学
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毒理学
·
海洋生物学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 8
·12188-12197
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IF 4.223
Jiang Chengyu,Chen Qingjin
Nanoparticles can undergo aging phenomena in sewage treatment systems, which alter their physical and chemical properties. However, the effect of aged nanoparticles on the dewatering performance of activated sludge under long-term low concentrations is yet to be reported in sewage treatment systems. Here, we compared the chronic effects of pristine and aged TiO 2 nanoparticles on the sludge dewatering index, which includes specific resistance to filtration (SRF) and bound water (BW) in a sequencing batch reactor (SBR) at μg/L concentration levels, and analyzed the relevant mechanisms. The results indicated that aging in the sludge supernatant altered the photosensitivity and water stability of nanoparticles, which was mainly due to the changes in the zeta potential and energy band of the particle and was ultimately attributed to the combined effect of particle surface inclusions such as organic matter and inorganic salt. At 10 μg/L, nanoparticles reduced the sludge dewaterability, which observed an improvement at 100 μg/L. This is because 10 μg/L promoted the secretion of extracellular polymeric substances (EPS), which regulated the structure of sludge flora and increased the abundance of secreted quorum sensing-acyl-homoserine lactones (QS-AHL) and EPS genera, while the corresponding exposure results for 100 μg/L were the opposite, owing to the damage and necrosis effects caused by exposure under long-term light, which reduced EPS production and increased sludge density. Interestingly, aging could alleviate the effects of two exposure concentrations on sludge dewatering, mainly because of the decrease in the photoactivity of the nanoparticles. The results of this study show that environmental aging could delay, but not reverse the results of exposure to specific concentrations of nanoparticles. However, the significantly different ecological effects of photosensitive nanoparticles with two environmentally relevant concentration should be refined and confirmed again in freshwater environments to provide a basis for subsequent scientific management and control of photosensitive nanoparticles.
研究领域:
环境科学
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污水处理
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微生物学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 11
·期 3
·375-380
·
IF 2.073
Yanni Luo,Yan Mi,Xuecai Tan,Quanyou Chen,Defen Feng,Chenhao Ai
A convenient photoelectrochemical sensor was constructed based on the synergistic contributions of an ultrathin BiOCl nanosheet and anchored TiO2 nanoparticles to detect the organophosphorus pesticide chlorpyrifos. As expected, the fabricated heterostructure showed a distinct improvement in photocurrent intensity compared with pristine BiOCl and TiO2. This remarkable enhancement may be attributed to the separation and transfer of photogenerated charge carries, which benefit from intimate interfacial interactions between the ultrathin BiOCl nanosheets and TiO2 nanoparticles. Based on the robust photocurrent signal, a novel PEC sensor was established for the sensitive and selective detection of chlorpyrifos. The as-fabricated PEC sensor demonstrates many advantages such as a wide linear range of 1–12 μM, a low detection limit of 0.11 μM, S/N = 3, and remarkable convenience, which provides a general format for chlorpyrifos detection in green vegetable analysis.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Cong Fu,Lingfang Liu,Guofeng Zhao
The effect of noble metal cocatalyst loading on the concentration of surface-reaching photoexcited charges on semiconductors is an interesting and important issue in photocatalysis. Herein, through in situ diffuse-reflectance infrared spectroscopy (DRIFTS), an adsorbate (methanol) surface elementary reaction kinetic analysis method has been exploited to track the concentration of surface-reaching photoholes in a series of Ag/TiO2 nanoparticles with varied Ag loading. The photocatalytic oxidation of adsorbed methanol species on the Ag/TiO2 surface proceeds via first-order reaction kinetics. Thus, the measured reaction rate constants directly reflect the concentration of surface-reaching photoholes under light irradiation. By determining the specific reaction rate constants for methanol oxidation on the Ag/TiO2 surface, we discover that the concentration of surface-reaching photoholes under light irradiation exhibits a volcano-shaped dependence on the Ag loading. Under the optimized Ag loading, it could be found that the concentration of surface-reaching photoholes on Ag/TiO2 surface is nearly 1.5 times greater than that of the pristine TiO2 surface. These results provide, for the first time, unambiguous experimental evidence for the significance of modification with suitable noble metal cocatalysts on regulation of surface-reaching photoexcited charges in semiconductor-based photocatalysis.
研究领域:
材料科学
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光催化领域
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DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Kang Xu,Yi Tu,Yanhong Feng,Xiaochun Yin,Guizhen Zhang
This paper presents a highly efficient method for preparing ultrathin, high-strength photocatalytic membranes with a three-layer structure and high-loading catalysts on both sides. The photocatalytic membranes were prepared by simultaneous biaxial stretching using ultrahigh-molecular-weight polyethylene as the matrix, TiO2 nanoparticles as the catalyst (80 wt %), and liquid paraffin as the plasticizer. The mechanical properties of these membranes were tested, and the tensile strength of the membrane with a biaxial stretching ratio of 7 × 7 reached 62 MPa. Three types of dyes, methyl orange, methylene blue, and Congo red, and their mixed solutions were selected as model pollutants to investigate the photocatalytic properties of the prepared photocatalytic membranes. Results show that the 7 × 7 membrane can almost degrade the above pollutants within 100 min. Moreover, this membrane exhibits remarkable stability in cyclic photodegradation tests, with a degradation rate reaching 95.9% after five cycles. This preparation method is anticipated to provide a good carrier for various photocatalysts, making the photocatalytic membrane suitable for a wide range of applications in the treatment of water contamination.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yiqun Su,Mian Gong,Yipeng Liu,Faiz Ullah Shah,Aatto Laaksonen,Rong An
Titanium dioxide (TiO2) nanostructures exhibit exceptional flexibility for integration into surface-enhanced Raman spectroscopy (SERS) sensing platforms enabling nanoscale trace detection of biomolecules with high sensitivity. However, fabricating TiO2 nanomaterials for large-scale SERS applications remains challenging due to the high cost and complexity of synthesis methods. In this study, we demonstrate a cost-effective and scalable approach using commercial TiO2 P25 nanoparticles as the SERS substrates, functionalized with a phosphonium-based fluorine-free ionic liquid (IL) comprising the trihexyl(tetradecyl)phosphonium cation ([P6,6,6,14]+) with four long alkyl chains and the 2–2-(2-methoxyethoxy)ethoxy anion ([MEEA]−). This IL serves as a nanoscale “linker”, effectively bridging Cytochrome c (Cyt c) molecules with TiO2 nanoparticles, significantly enhancing the Cyt c–TiO2 interactions and SERS signal intensity. The optimized system achieves remarkable sensitivity, enabling the detection of Cyt c concentrations as low as 5 × 10–4 M, with an enhancement factor increased by 1 order of magnitude compared to the control system. This work stresses the importance of nanoscale interactions and offers an alternative straightforward strategy for trace protein detection using commercially available TiO2 P25 nanoparticles, thus circumventing the need for complex nanomaterial fabrication methods.
研究领域:
生物传感
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纳米材料科学
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分析化学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Dong Ri Zhang,Xuan Zhen Jin,Jing Hao Li
TiO 2 nanoparticles doped with 2.0 at.% Sc and 2.0 at.% V calcinated at temperatures of 500–800 °C were investigated by XRD technique. Results show that Sc doping promote the anatase-to-rutile phase transition compared to the pure TiO 2 , while V doping inhibit the anatase-to-rutile phase transition below 600 °C and then rapidly accelerated the anatase-to-rutile phase transition above 600 °C. However, the anatase-to-rutile phase transition is significantly inhibited by Sc V codoping until 750 °C. The M, И and Λ pattern evolutions of the average crystallite size of rutile with calcination temperature are found and two models are proposed for the findings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Pei Qiu,Mengjie Lu,Gang Cheng,Wei Li,Lijun Liu,Jinyan Xiong
Semiconductor photocatalysis serves a green technique to convert solar energy to sustainable hydrogen energy through water splitting. TiO 2 has attracting increasing interest and much effort has been paid on addressing the suffered drawbacks of solar energy utilization limitation and electron-hole recombination. In this work, simultaneously involving of oxygen vacancy and Cu into TiO 2 nanoparticles has been achieved through self-reduction of Cu 2 O and self-transformation of Ti-precursor from Cu 2 O@Ti-precursor in ethylene glycol-water medium. The Cu@TiO 2-x hybrids show improved photocatalytic H 2 production, and the Cu@TiO 2-x -1% sample has H 2 evolution rate of 7218.8 μmol g −1 h −1 , which is 2.1 times higher than that of TiO 2-x . It is proposed that the involving of metallic copper and oxygen vacancy by this solvothermal approach can enhance light absorption, promote electron-hole pairs separation and charge transfer, and increase active sites of TiO 2 nanoparticles, resulting in synergetic effect for hydrogen production improvement.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Simin Peng,Bin Dang,Yao Zhou,Jun Hu,Jinliang He
The interfacial region between a nanoparticle and the polymer matrix is considered to have an important effect on the properties of nanocomposites. In this experimental study, the tuning effects of surface-modified TiO2 nanoparticles on the aggregation structure and trapping property of the nanocomposites are investigated. The addition of TiO2 nanoparticles increases the number of spherulites and decreases their sizes. It is also found that TiO2 nanoparticles can suppress the mobility of chain segments in the interfacial region, suppress crystallization, and reduce the crystallinity, depending on the surface modification and loading levels of nanoparticles. On the basis of the conclusions, the model of a spherulite and the interface is established and the trap distribution of the interface is analyzed according to the results of TSC measurements. It is assumed that there is a strong correlation between traps and the charge transport of nanocomposites, and the mechanism of charge transport is discussed with respect to the results of the volume conductivity measurement. It is believed that this study would provide an important hint to the research of the interface between nanoparticles and the polymer matrix in future research.
研究领域:
材料科学
·
高分子物理
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Qingfeng Zhou,Yanfeng Liu,Gaobo Yu,Furui He,Kai Chen,Dunchao Xiao,Xinyu Zhao,Yuhong Feng,Jiacheng Li
Sono-photo-Fenton, sono-Fenton and photo-Fenton methods combined with heterogeneous TiO 2 nanoparticles are adopted to investigate the degradation of sodium alginate (NaAlg), and the kinetics mechanism is also explored. Experimental results suggest that the reaction order of NaAlg degradation ( n ) is 0.51 and the extent of photocatalytic degradation can increase with the loading of TiO 2 nanoparticles. Meanwhile, as the catalyst concentration increases from 0.05 to 0.5 gL −1 , the degradation rate constant ( k ) is decreased. In addition, the structure of degraded NaAlg is characterized by Fourier transform infrared (FT-IR), 1 H NMR spectroscopy, and X-ray diffraction analyses. The FT-IR and 1 H NMR spectra results indicate that the C2-C3 bond in the structure of NaAlg is broken and intra-molecular esters are formed during the degradation process due to the strong oxidization of the Fenton system. In general, the sono-photo-Fenton process with TiO 2 nanoparticles could provide an efficient way to degrade the NaAlg to low-molecular-weight.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·19424-19433
·
IF 2.478
Guo Chengbin,Hu Rong,Qiao Hui,Duan Chenguang,Qi Xiang
Titanium dioxide (TiO 2 ) has been widely studied in the field of photocatalysis. However, the development of TiO 2 was limited by the photoresponse only in the ultraviolet region and the rapid recombination of photogenerated electron–hole pairs. In this work, we prepare a novel TiO 2 and two-dimensional (2D) bismuth selenide (Bi 2 Se 3 ) hybrid nanosheets (TiO 2 /Bi 2 Se 3 HNs) via a simple water bath ultrasonic route. X-ray diffraction pattern and Raman spectra were carried out to confirm that as-prepared samples were pure and well crystalized. Besides, TEM characterization proves that 2D Bi 2 Se 3 nanosheets have high specific surface area and it can be clearly observed that the TiO 2 with 60 nm particles are uniformly supported on the surface. Furthermore, photoelectrochemical (PEC) measurements demonstrate that the TiO 2 /Bi 2 Se 3 HNs exhibit excellent photocatalytic performance of 4.3 µA/cm 2 under 100 W of visible light, which were almost 2.5 times that of pure TiO 2 . More importantly, our results show that the photocurrent density was quite stable and only dropped by 10% after 125 cycles. In summary, the improved photocatalytic activity is due to the unique characteristic of 2D Bi 2 Se 3 nanosheets, such as maximized reaction sites and good electrical conductivity, and the positive coupling effect of the TiO 2 /Bi 2 Se 3 heterojunction. These extraordinary properties make the TiO 2 /Bi 2 Se 3 HNs photocatalysts have excellent potential for photocatalytic application.
研究领域:
材料科学
·
环境科学
✓ 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）