INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yingying Ning,Jingjun Shi,Shan Yu,Renpeng Du,Jingping Ge,Dan Zhao
Multifunctional food packaging composite films were prepared using Pediococcus acidilactici J1 exopolysaccharide (EPS), potato starch (PS) and TiO 2 nanoparticles by casting method. The microstructure, physicochemical properties and antibacterial activity of EPS/PS composite films with different weight ratio of TiO 2 nanoparticles were characterized. Transmission electron microscope (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed the uniform distribution of TiO 2 nanoparticles in the EPS/PS matrix. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) results indicated that the interaction between polymers and nanoparticles through non-covalent bonds. When TiO 2 nanoparticles were added at 1 % (wt), the composite film had higher barrier properties against water vapor and UV–vis light, and better mechanical properties then EPS/PS film. Notably, EPS/PS/1%TiO 2 composite film exhibited good antioxidant and antibacterial activity against Escherichia coli and Staphylococcus aureus . Through the analysis of the quality indexes and microbial community structure during the storage of chilled meat, the composite film slowed the oxidation rate of chilled meat and inhibited the growth of dominant spoilage bacteria, effectively extending its shelf life. All results suggested that EPS/PS/1%TiO 2 composite film could serve as an effective packaging material for chilled meat, providing a novel approach to solve its limited shelf-life problem.
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RSC Advances
·
2024
·Vol. 14
·期 17
·12225-12234
·
IF 3.9
Zhixuan Wu,Zhengai Chen,Zhixiang Deng,Ning Dai,Yan Sun,Meiying Ge
In this work, a high-performance room-temperature ammonia (NH3) gas sensor based on Pt-modified WO3–TiO2 nanocrystals was synthesized via a two-step hydrothermal method. The structural properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The 10 at% Pt@WO3–TiO2 nanocrystals present the highest NH3 sensing performance at room temperature. Compared with the nanocrystals without Pt modification, the sensitivity of the Pt@WO3–TiO2 sensor is tenfold higher, with the lowest concentration threshold reaching the 75 ppb level. The response is approximately 92.28 to 50 ppm, and response and recovery times are 23 s and 8 s, respectively. The improved sensing was attributed to a synergetic mechanism involving the space charge layer effect and Pt metal sensitization, enhancing the electron transfer efficiency, oxygen vacancy and specific surface area. This study is expected to guide the development of high-performance room-temperature ammonia sensors for clinical breath testing.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17417-17425
·
IF 7.443
Rui Tang,Longwei Yin
We present a novel Sr-doped TiO2/SrTiO3 nanorod array heterostructure for dye-sensitized solar cells (DSSCs) via a facile two-step hydrothermal process, with a tunable microstructure, optical response and photoelectrical conversion properties. The chemical composition components and microstructures of Sr-doped TiO2/SrTiO3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively. It is shown that the treatment of rutile TiO2 nanorod arrays in Sr(NO3)2 solution results in the self-doping of Sr into the lattice of TiO2 and formation of Sr-doped TiO2/SrTiO3 nanorod array heterostructures, inducing a transition of optical response properties from the ultraviolet region to the visible region. The photogenerated electrons and holes can be effectively separated due to the formation of SrTiO3/Sr-doped TiO2 heterostructures with a uniquely matched band-gap energy structure, resulting in greatly enhanced photoelectric conversion efficiency performance. Electrochemical impedance spectroscopy and photoluminescence results show that the formation of Sr-doped TiO2/SrTiO3 heterostructures can effectively prolong the charge carrier lifetime. The dye loading capacity on the Sr-doped TiO2/SrTiO3 heterostructures can be improved through the functionalization bonding of the hydroxide group on the surface of the electrode material. DSSCs based on the optimized Sr-doped TiO2/SrTiO3 heterostructure photoanode achieve the highest energy conversion efficiency of 4.70% (one sun illumination), nearly 1.5 times higher than the bare rutile TiO2 photoanode (3.10%).
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Journal of Water Process Engineering
·
2015
·
IF 0
Dongfang Zhang,Jiaxun Wang
Liquid-phase photocatalytic oxidation of a secondary diazo dye compound, Congo red (CR, C 32 H 22 N 6 Na 2 O 6 S 2 ) and pharmaceutical phthalylsulfathiazole, was carried out in a cylindrical photochemical reactor on gold-loaded titania systems. The deposition of Au nanoparticles was performed by photochemical deposition methods on the surface of pre-sulphated titania. The detailed structural, compositional and optical characterization and physico-chemical properties of the obtained products are analyzed by X-ray diffraction (XRD), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), high resolution TEM (HRTEM), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), Fourier transformation infrared spectroscopy (FTIR) and photoluminescence spectra (PL) analysis. Notable enhancements in the photocatalytic activity of TiO 2 were achieved by deposition of gold onto titania, which can be attributed to the enhanced surface electron excitation and effective electron-hole separation on gold-deposited TiO 2 nanoparticles. The present study shows that the higher rate of photodegradation observed on Au-TiO 2 at pH 6.5 can be correlated to the ratios of the concentrations of the ionized to the neutral dye molecules and also to the higher concentration of hydroxylated surface, which are able to effectively scavenge photogenerated valence band holes. Accumulation of the holes in the semiconductor particles increases the probability of formation of excited oxygen atom which is a reactive species readily oxidizing the organic dye molecule or environmental pollutant such as pharmaceutical phthalylsulfathiazole. The reaction mechanism of the photocatalytic system was detected by a photoluminescence method using terephthalic acid as a probe molecule.
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ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·161-168
·
IF 2.138
Meichuan Liu,Jing Yu,Xue Ding,Guohua Zhao
In this work, a visible-light driven photoelectrochemical (PEC) aptasensor with high sensitivity and selectivity for cyanobacterial toxin Microcystin-LR (MC-LR) has been developed. MC-LR aptamers, serving as the specific recognition element, were conveniently immobilized onto vertically-aligned titanium dioxide nanotubes (TiO 2 NTs) photoanode substrate with the aid of graphene via π–π stacking interactions between the graphene hexagonal cells and the nucleobases of the DNA. The functionalization of graphene further endowed the constructed aptasensor visible-light response activity. The aptasensor was used for the label-free analysis of MC-LR by monitoring the increase in photocurrent that resulted from the binding of MC-LR and its aptamers. Results showed that the photocurrent increment had a linear relationship with logarithm of MC-LR concentration in the range from 1.0 to 500 fM and the limit of detection reached as low as 0.5 fM. Furthermore, the aptasensor exhibited high selectivity while used to detect 100-fold concentration other several potential coexisting interferents. A promising PEC aptasensing platform for highly sensitive and selective monitoring of MC-LR has thus been established.
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Ganeshraja Ayyakannu Sundaram,Minghui Yang,Kiyoshi Nomura,Suresh Maniarasu,Ganapathy Veerappan,Tao Liu,Junhu Wang
Hierarchical tin-doped titania (ST) and tin- and nitrogen-codoped titania (SNT) microspheres were prepared by a hydrothermal method and nitriding treatment, in particular, SNT-enhanced visible light photocatalytic activity for the degradation of rhodamine B in aqueous solution and room-temperature ferromagnetism (RTFM). We initiated the photovoltaic study of ST and SNT microspheres to confirm the photovoltaic properties of perovskite solar cell (PSC) applications. The SNT microspheres exhibited relatively large saturation magnetization and high photocatalytic activity. To clarify the enhancement of the photoactivity, the prepared samples were characterized by 119Sn Mössbauer spectrometry under external magnetic fields. The broadened peaks of ST and SNT microspheres were decomposed into a doublet and a sextet under an external magnetic field because the samples showed weak ferromagnetism, although these samples are composed of nonmagnetic components. It is noteworthy that ST and SNT microspheres exhibits oxygen vacancies and defect-induced magnetism. The results signify the clear details of the RTFM and the photocatalytic activity of hierarchical ST and SNT microspheres.
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CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Lin Liu,Xiang-Mei Yu,Bao Zhang,Shu-Xian Meng,Ya-Qing Feng
The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO 2 nanoparticles that were synthesized via a hydrothermal method was studied. The synthesized TiO 2 nanoparticles were characterized by X-ray diffraction (XRD), nitrogen sorption analysis, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and UV–vis spectroscopy. Then the J - V curve, electrochemical impedance spectroscopy (EIS), and open-circuit voltage decay (OCVD) measurement were applied to evaluate the photovoltaic performance of DSSCs. Compared with the commercial TiO 2 nanoparticles (P25), the synthesized-TiO 2 nanoparticles showed better performance. By adding diethylene glycol (DEG) before the hydrothermal process, the synthesized TiO 2 nanoparticles (hereafter referred to as TiO 2 -DEG particles) shows narrower size distribution, larger specific surface area, higher crystallinity, and less surface defects than TiO 2 (DEG free) particles. The analysis of photovoltaic properties of DSSCs based on TiO 2 -DEG particles showed that the recombination of electron-hole pairs was decreased and the trapping of carries in grain boundaries restrained. It was believed that the photoelectrode fabricated with the as-prepared TiO 2 nanoparticles improved the loading amount of dye sensitizers (N719), and enhanced the photocurrent of the DSSCs. As a result, the TiO 2 -DEG particle based cells achieved a photo-to-electricity conversion efficiency ( η ) of 7.90%, which is higher than 7.53% for the cell based on TiO2 (DEG free) and 6.59% for the one fabricated with P25.
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CHEMOSPHERE
·
2016
·
IF 3.698
Zhuang Wang,Se Wang,Willie J.G.M. Peijnenburg
Co-exposure of aquatic organisms to engineered nanoparticles (ENPs) and antibiotics is likely to take place in the environment. However, the impacts of co-exposure on aquatic organisms are virtually unknown and understanding the joint toxicity of ENPs and antibiotics is a topic of importance. The independent action (IA) model and the concentration addition (CA) model are two of the most common approaches to mixture toxicity assessment. In this study, the joint toxicity of two ENPs (nCeO 2 and nTiO 2 ) and one antibiotic (florfenicol, FLO) to Chlorella pyrenoidosa was determined to compare the applicability of the IA and the CA model. Concentration-response analyses were performed for single toxicants and for binary mixtures containing FLO and one of the ENPs at two suspended particle concentrations. The effect concentrations and the observed effects of the binary mixtures were compared to the predictions of the joint toxicity. The observed toxicity associated with the nCeO 2 or nTiO 2 exposure was enhanced by the concomitant FLO exposure. The joint toxicity of nCeO 2 and FLO was significantly higher than that of nTiO 2 and FLO. Predictions based on the IA and CA models tend to underestimate the overall toxicity (in terms of median effect concentration) of the binary mixtures, but IA performs better than CA, irrespective of the effect level under consideration and the types of mixtures studied. This result underpins the need to consider the effects of mixtures of ENPs and organic chemicals on aquatic organisms, and the practicability of the IA and CA methods in toxicity assessment of ENPs.
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SUPERLATTICES AND MICROSTRUCTURES
·
2016
·
IF 2.117
Fangmin Yan,Lianfeng Duan,Qiqian Gao,Jiao Men,Shihan Sun,Xueyu Zhang,Wei Lü
In spite of the great development in quantum dot sensitized solar cells (QDSSCs), enrichment of material system of QDSSCs is still imperial mission for further advances. In this report, two-dimensional graphitic carbon nitride (g-C 3 N 4 ) prepared from urea was applied to modify porous TiO 2 photoanodes , followed by the deposition of CdS and CdSe QDs as sensitizers. In the as-prepared photoanodes, g-C 3 N 4 functioned as barrier for retarding electron backward recombination and assisted to strengthen light absorption . Compared with the pure TiO 2 photoanode, the photoelectrical behaviors of g-C 3 N 4 modified TiO 2 photoanode were obviously improved. By optimizing the loading amount of g-C 3 N 4 , the champion performance was achieved at 15% addition amount of g-C 3 N 4 with shortcircuit current density of 15.1 mA cm −2 , open circuit voltage of 0.56 V, and energy conversion efficiency of 4.14% under AM 1.5 illumination. The improvement in cell performance was attributed to the type II alignment between g-C 3 N 4 and TiO 2 , which induced the fast separation of photogenerated carriers. The transfer of the photogenerated electrons and holes is driven by the conduction band offset of 0.39 eV and the valence band offset of 0.86 eV, respectively. Present results provided a new insight for further optimum photoanode structures of QDSSCs.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Baolin Yan,Juan Zhou,Xiaoyu Liang,Kainan Song,Xintai Su
The production of H 2 by photocatalytic water splitting has become a promising approach for clean, economical, and renewable evolution of H 2 by using solar energy. In spite of tremendous efforts, the present challenge for materials scientists is to build a highly active photocatalytic system with high efficiency and low cost. Here we report a facile method for the preparation of TiO 2 /C nano-flakes, which was used as an efficient visible-light photocatalyst for H 2 evolution. This composite material was prepared by using a phase-transfer strategy combined with salt-template calcination treatment. The results showed that anatase TiO 2 nanoparticles with the diameter of ∼10 nm were uniformly dispersed on the carbon nano-flakes. In addition, the samples prepared at 600 °C (denoted as T600) endowed a larger surface area of 196 m 2 g −1 and higher light absorption, resulting in enhanced photocatalytic activity. Further, the T600 product reached a high H 2 production rate of 57.2 μmol h −1 under visible-light irradiation. This unusual photocatalytic activity arose from the positive synergetic effect between the TiO 2 and carbon in this hybrid catalyst. This work highlights the potential of TiO 2 /C nano-flakes in the field of photocatalytic H 2 evolution under visible-light irradiation.
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JOURNAL OF MATERIALS RESEARCH
·
2016
·Vol. 31
·期 19
·3036-3043
·
IF 1.579
Ammara Riaz,Hejinyan Qi,Yuan Fang,Jianfeng Xu,Chunmei Zhou,Zhengguo Jin,Zhanglian Hong,Mingjia Zhi,Yi Liu
TiO2 nanofibers (TNFs) with different anatase/rutile phase ratios were fabricated using electrospinning technique followed by the annealing at different temperatures. The effect of annealing temperatures on their morphology, structural, and optical properties and photocatalytic activity was investigated. The photocatalytic performance of TNFs was evaluated by degradation of methyl orange (MO) in aqueous solution under the irradiation of simulated solar light. Annealing temperature significantly influenced photocatalytic degradation of MO due to the incorporation of rutile phase which suppresses recombination of photoactivated electron and hole pairs. Turnover frequency (TOF) of MO degradation was introduced to describe the intrinsic activity of TNFs. TNFs acquired best anatase/rutile phase ratio (A/R = 83/17) when annealed at 650 °C, resulting in highest TOF value 2394 h−1, two times higher as compared to P25 with similar anatase/rutile phase ratio (A/R = 85/15). Appropriate crystalline structure could be the reason for good photocatalytic activity as well as intrinsic activity of TNFs.
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Journal of Environmental Sciences
·
2016
·
IF 2.208
Zhuowei Cheng,Zhiqi Gu,Jianmeng Chen,Jianming Yu,Lingjun Zhou
The photocatalytic oxidation of gaseous chlorobenzene (CB) by the 365 nm-induced photocatalyst La/N–TiO 2 , synthesized via a sol–gel and hydrothermal method, was evaluated. Response surface methodology (RSM) was used to model and optimize the conditions for synthesis of the photocatalyst. The optimal photocatalyst was 1.2La/0.5N–TiO 2 (0.5) and the effects of La/N on crystalline structure, particle morphology, surface element content, and other structural characteristics were investigated by XRD (X-ray diffraction), TEM (Transmission Electron Microscopy), FTIR (Fourier transform infrared spectroscopy), UV–vis (Ultraviolet–visible spectroscopy), and BET (Brunauer Emmett Teller). Greater surface area and smaller particle size were produced with the co-doped TiO 2 nanotubes than with reference TiO 2 . The removal of CB was effective when performed using the synthesized photocatalyst, though it was less efficient at higher initial CB concentrations. Various modified Langmuir-Hinshelwood kinetic models involving the adsorption of chlorobenzene and water on different active sites were evaluated. Fitting results suggested that competitive adsorption caused by water molecules could not be neglected, especially for environments with high relative humidity. The reaction intermediates found after GC–MS (Gas chromatography–mass spectrometry) analysis indicated that most were soluble, low-toxicity, or both. The results demonstrated that the prepared photocatalyst had high activity for VOC (volatile organic compounds) conversion and may be used as a pretreatment prior to biopurification.
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