ADVANCED POWDER TECHNOLOGY
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2018
·
IF 2.943
Junkai Cao,Xue-Zhi Song,Xiaolan Kang,Zideng Dai,Zhenquan Tan
Herein, we report a facile one-pot solvothermal method to prepare unique oleic acid (OA) modified monodispersed mesoporous TiO 2 nanospheres with carboxylate ligands from the oleic acid in the bidentate chelating linkage mode. The mesoporous OA-TiO 2 nanospheres have a very large specific surface of nearly 510 m 2 /g. The oleic acid cannot only act as a binding ligand to control the shape of mesoporous TiO 2 nanospheres, but also be benefit to enhance the visible-light absorption. The mesoporous OA-TiO 2 nanospheres exhibit an excellent photocatalytic performance in the degradation of Rhodamine B and phenol under the visible light irradiation and show almost no attenuation after four cycles.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2018
·
IF 3.193
Hao Yang,Hui Zhang,Henglun Cheng,Baoqing Shentu
Nano-TiO 2 immobilized antioxidant (TiO 2 -KH550-AG) was prepared to improve the ageing resistance of thermoplastic vulcanizate (TPV) exposed to UV/O 3 . TiO 2 nanoparticles were firstly modified with 3-aminopropyltriethoxysilane (KH550) and then reacted with the antioxidant , 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (AG), through the acyl chloride reaction followed by the amidation. FT-IR, XPS and TGA measurements confirmed that the antioxidant (AG) was chemically immobilized onto the nano-TiO 2 surfaces. TPV/TiO 2 -KH550-AG nanocomposites were prepared by melt mixing. SEM observation showed that TiO 2 -KH550-AG was homogeneously dispersed into the matrix of TPV. The UV/O 3 ageing test of the samples was carried out in the environment with constant UV intensity of 1.40 mW/cm 2 and ozone concentration of 100 ± 4 mg/m 3 . The ageing resistance behavior of the TPV/TiO 2 -KH550-AG nanocomposites was evaluated by the changes of surface morphology , mechanical properties and carbonyl index during the UV/O 3 ageing test. It was observed that the TPV/TiO 2 -KH550-AG exhibited high stability during the process of UV/O 3 ageing. The results revealed that the anti-ageing efficiency of TiO 2 -KH550-AG was superior to the mixture of the corresponding AG and modified TiO 2 , owing to the better dispersion and migration resistance of TiO 2 -KH550-AG.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Lei Chen,Ding Weng,Jiadao Wang,Duan Weng,Li Cao
The CeO 2 -TiO 2 (CeTi) and CeO 2 /WO 3 -TiO 2 (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH 3 -NO/NO 2 selective catalytic reduction (SCR) performance was studied. N 2 O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO 2 /NO x ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH 3 -NO/NO 2 SCR performance due to the catalyst reoxidation rate by NO 2 higher than by O 2 . Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NO x performance under NH 3 -NO/NO 2 SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO 3 provides more acid sites which accelerate the reaction between NH 4 NO 3 and NO to get a superior low-temperature activity. Amount of N 2 O formation shows a peak at 250 °C mainly derived from NH 4 NO 3 decomposition.
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高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5030-5037
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IF 3.864
Qiong Wu,Fengxia Zhang,Huijuan Li,Zhihua Li,Qi Kang,Dazhong Shen
Herein, we report a ratiometric photoelectrochemical (PEC) immunosensor coupled with secondary antibodies–Co3O4 nanoparticle conjugates (Ab2–Co3O4 NPs) for signal amplification. The Ab1-g-C3N4@TiO2 NTs and BSA-g-C3N4@TiO2 NTs act as the sensing and reference photoelectrodes, where Ab1, BSA and TiO2 NTs are the capture antibodies, bovine serum albumin and TiO2 nanotube arrays, respectively. In the presence of target Ag, the sensing PEC photocurrent decreases due to the steric hindrance of Ab1 molecules, which increases the inner resistance of the photoelectrode. The signal-off response is enhanced further using Ab2–Co3O4 NP conjugates due to their steric hindrance effect and the consumption of electron donors by the Co3O4 NPs. Furthermore, the performance of the ratiometric PEC platform is tested using alpha-fetoprotein (AFP) as a model antigen. Under the optimal conditions, the concentration of AFP is detected in the range of 0.4 pg mL−1 to 40 ng mL−1 with a detection limit of 0.2 pg mL−1. This ratiometric strategy is beneficial to improve the reliability and anti-interference ability of PEC immunosensors.
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DOI
PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 51
·29172-29178
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IF 2.936
Jie Liu,Pinghe Yin,Ling Zhao
Macroalgae, the major contributor of primary productivity in coastal seas, contribute to the material cycle and energy flow in marine ecosystems. The purpose of this work was to evaluate the toxic effect of nano-TiO2 on the growth and antioxidant activity of Gracilaria lemaneiformis. An obvious inhibition of growth was observed in this study. The algae exposed to nano-TiO2 showed a negative growth rate at 20 mg L−1 and 40 mg L−1 during the 15 days exposure. The concentration of soluble protein increased slightly during the first 3 days of exposure, but it gradually diminished thereafter due to the high concentrations of nano-TiO2 and to prolonged exposure. Nano-TiO2 caused oxidative damage in G. lemaneiformis; superoxide anions accumulated, and nitrate reductase activity decreased linearly with the increase in nano-TiO2. Furthermore, extracts of G. lemaneiformis can scavenge DPPH· and hydroxyl radicals for their antioxidant capacity. However, the capacity to scavenge DPPH· and hydroxyl radicals in vitro decreased slightly with the increase in nano-TiO2. The results from this work imply that macroalgae can be an effective biomarker of nano-TiO2 contamination and can be useful indicators to evaluate the oxidative damage of increasing pollutants in marine ecosystems.
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DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
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2018
·Vol. 16
·期 11
·7275-7284
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IF 2.037
He Huijun,Wu Bin,Yang Chunping
The colloidal stability and photocatalysis of nano-TiO 2 particles were investigated in the presence of fulvic acids (FA) and electrolytes (NaNO 3 , Na 2 SO 4 , Na 3 PO 4 ) at different pH. Results showed that increasing FA concentration, the absolute value of zeta potential of nano-TiO 2 increased and particle size decreased at all pH which promoted the colloidal stability of nano-TiO 2 . Particle size of nano-TiO 2 was larger with the coexistence of FA and electrolytes than with FA only as the concentration of electrolytes was greater than or equal to 0.01 mol/L. The largest particle size occurred in the presence of Na 3 PO 4 , followed by Na 2 SO 4 and NaNO 3 . Particle size of nano-TiO 2 decreased with higher pH and stability further increased in the presence of FA and/or electrolytes. Nano-TiO 2 stabilization was enhanced by increasing FA concentration when the solution pH was 7.0. However, the removal efficiency of atrazine by nano-TiO 2 decreased with the increase in FA concentration. Adding electrolytes (0.01 mol/L), atrazine removal by nano-TiO 2 further decreased, albeit slightly. The inhibitory effect of electrolytes on nano-TiO 2 removal of atrazine was highest for Na 3 PO 4 , followed by Na 2 SO 4 , and NaNO 3 , which were consistent with the results of colloidal stability of nano-TiO 2 . These findings help to better understand the mechanisms and correlation between colloidal stability and photocatalysis of nano-TiO 2 in the presence of FA and electrolytes.
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2018
·Vol. 83
·期 11
·2819-2826
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IF 2.018
Yuanyuan Wu,Shuai Li,Jingxin Song,Bingxue Jiang,ShanShan Chen,Huimin Sun,Xinxin Li
Nano-titanium dioxide (TiO 2 ) was modified with the surfactant sodium laurate (SL) via ultrasonic microwave-assisted technology to improve the dispersion of TiO 2 in polymer matrices. As revealed by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy analyses, SL was well adsorbed onto the TiO 2 surface through chemical bonding, resulting in SL-modified TiO 2 (TiO 2 -SLx). The hydrophobicity and dispersibility of TiO 2 -SLx increased significantly compared to unmodified nano-TiO 2 . With an increase in the SL concentration from 5% to 15%, the agglomeration of TiO 2 -SLx particles decreased considerably, while the particles were more uniform. TiO 2 -SLx nanoparticles (3 wt%) were then incorporated into acetylated distarch phosphate/chitosan (ADPS/CS) blended matrices to reinforce the biopolymers. Relative to unmodified TiO 2 , TiO 2 -SLx exhibited a better dispersion capability. Furthermore, as the SL concentration increased, the tensile strength (TS) of the composite films increased, while the elongation at break (E), water vapor permeability (WVP), and solubility all decreased. The composite film containing TiO 2 -SL15 (TiO 2 modified with 15% SL; ADPS/CS-TiO 2 -SL15 film) displayed the highest TS (31.50 MPa), which was 33.70% higher than that of the pure ADPS/CS film, whereas the ADPS/CS-TiO 2 -SL25 film exhibited the lowest E. Further, the ADPS/CS-TiO 2 -SL15 film displayed the lowest WVP (0.90 × 10 −12 g·cm −1 ·s −1 ·Pa −1 ) and solubility (22.91%), which decreased by 30.23% and 26.03% compared to that of the pure ADPS/CS film, respectively. Therefore, SL modification and the use of ultrasonic microwave-assisted technology are promising for the preparation of nanofillers for biopolymer reinforcement. Practical Application Nano-titanium dioxide (TiO 2 ) nanoparticles were modified using the anionic surfactant sodium laurate via ultrasonic-microwave assisted technology, to improve the dispersion of the TiO 2 nanoparticles in polymer matrices. Modified TiO 2 nanoparticles were incorporated into acetylated di-starch phosphate/Chitosan blend films, causing the tensile strength of the composite film to increase and the water solubility and water vapor permeability of the composite film to decrease, making the films suitable for packaging applications.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Liu,Mengting Yue,Jinrong Lu,Jinshan Hu,Yinghua Liang,Wenquan Cui
This paper reports that hybrid titanium dioxide (TiO 2 ) packaged self-assembly perylenetetracarboxylic acid diimide (PTCDI) by self-assembly. These were synthesized through simple mechanical milling that has great photocatalytic performance under visible light . The PTCDI@TiO 2 composite had high activity for the degradation of phenol and 2,4-dichlorophenol, which were 2.3 and 3.2 times of the monomer PTCDI, respectively. After three cycles, the activity of the composite catalyst remained at 70%. Further analysis showed that the photocatalytic activity and stability are mainly due to the enhancement of the charge mobility by the π-π conjugated structure in PTCDI. Moreover, the good energy level matching between PTCDI and TiO 2 helps to separate the electron-hole, thus improving the photocatalytic performance of the composite. The origin of photocatalytic activity was greatly improved due to holes and O 2 − , which was mainly attributed to the strong interaction between PTCDI and TiO 2 .
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Hongli Zheng,Huan Yi,Hong Dai,Dandan Fang,Zhensheng Hong,Danmei Lin,Xiangqin Zheng,Yanyu Lin
Herein, an effective integrated electrochemiluminescence (ECL) bioprobe was constructed based on F-couSiPc as co-reaction accelerator of tris (2,2′-bipyridine-n,n’)-, dichloride, hexahydrate (II) (Ru(bpy) 3 2+ ) and TiO 2 MOFs as carrier for developing a competitive-type ECL strategy for the sensing of deoxynivalenol (DON). Initially, TiO 2 MOFs with high specific surface area and regular pore structure was employed to immobilize Ru(bpy) 3 2+ and Mercapto-beta-cyclodextrin (β-CD), then sensitizer of F-couSiPc was introduced into the system by encapsulating into the cup-shaped cavity of β-CD, which mainly ascribed to the supermolecular self-assembly behavior, perfectly avoiding the aggregation of F-couSiPc. Due to the shortened electronic transmission distance, reduced energy loss and less reagent consumption, the integrated ECL reaction pattern between the luminescent Ru(bpy) 3 2+ and sensitizer of F-couSiPc has shown improved luminous efficiency compared with the common intermolecular ECL reactions. Meanwhile, the (3-Aminopropyl) triethoxysilane (APTES), perylene-3,4,9,10-tetracarboxylic acid (PTCA) and carbon nanohorn (CNHs) nanohybrid (APTES-PTCA@CNHs), combing the remarkable advantages of CNHs with the desirable electronic and optical properties of PTCA, served as matrix to immobilize antigen (DON) with an increasing amount, and on account of the high affinity between the APTES and DON, a stable ECL performance was obtained. Based on the competitive immunoreactions, a facile and sensitive ECL immunosensor was constructed for the detection of DON, with excellent linear range from 0.1 pg/mL to 20 ng/mL and a detection limit of 0.03 pg/mL (S/N = 3).
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高影响因子
FUEL
·
2018
·
IF 4.908
Xin Li,Yilin Xu,Chen Zhang,Hong Wang,Yongji Song,Wei Zhang,Cuiqing Li
Photocatalytic-adsorptive desulfurization of model fuel by the H 2 O 2 -assisted synthesized TiO 2 -SiO 2 (TiO 2 -SiO 2 -H) was investigated using air as the oxidant under UV irradiation. TiO 2 -SiO 2 -H was synthesized hydrothermally in the presence of H 2 O 2 and characterized by scanning electron microscopy (SEM), N 2 adsorption, X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoluminescence spectrum (PL). Compared to TiO 2 -SiO 2 synthesized in the absence of H 2 O 2 , Ti 0.25 SiO y -H showed greatly enhanced photocatalytic-adsorptive desulfurization performance due to its increased surface area, greatly increased UV absorption and decreased recombination of photogenerated hole/electron pairs. The Ti/Si molar ratio was optimized to 0.3 with the sulfur removal of 100% after reaction for 1 h at the fuel-to-Ti 0.3 SiO y -H weight ratio of 20, and the sulfur content could still be reduced to be <1 ppmw when the fuel-to-Ti 0.3 SiO y -H weight ratio was increased to 80. Moreover, TiO 2 -SiO 2 -H based photocatalytic-adsorptive process bears high selectivity for removing organosulfur in the toluene-containing fuel. The sulfur removal for model fuel containing 25 wt% toluene could reach 98.4% after reaction for 5 h. The photocatalytic-adsorptive selectivity of Ti 0.3 SiO y -H for organosulfur compounds in model diesel fuels followed the order of dibenzothiophene > 4,6-dimethyldibenzothiophene > benzothiophene. The desulfurization performance of TiO 2 -SiO 2 -H was basically stable after four consecutive desulfurization-regeneration cycles.
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高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Jing Ma,Xing Guo,Long Zhou,Zhenhua Lin,Chunfu Zhang,Zhou Yang,Gang Lu,Jingjing Chang,Yue Hao
Perovskite solar cells (PSCs) have been developed rapidly in recent years due to the excellent photoelectric properties and development potential. In this study, high performance and hysteresis-less planar structured perovskite (MA1–yFAyPbI3–xClx) solar cell was successfully achieved via contact passivation of the compact titanium dioxide (TiO2)/perovskite interface with NaCl doping method. It was found that the sodium chloride (NaCl) doping treatment on TiO2 could significantly improve the electrical property of TiO2 electron transport layer (ETL), and passivate the trap states at TiO2/perovskite interface. Moreover, the improved interface contact between TiO2 ETL and perovskite could efficiently enhance the charge transfer and suppress the charge recombination in the device. Hence, the power conversion efficiency (PCE) of PSC device based on NaCl-doped TiO2 was enhanced to 18.3% compared with the pristine compact TiO2-based PSCs (15.1%).
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Nano Energy
·
2018
·
IF 13.12
Yiqiang Zhang,Xiaotao Liu,Pengwei Li,Yanyan Duan,Xiaotian Hu,Fengyu Li,Yanlin Song
Even though TiO 2 is the most widely used electron transport layer (ETL) in high-efficiency perovskite solar cells (PSCs), ultraviolet photocatalysis and existence of intrinsic oxygen vacancies result in interfacial charge recombination and poor long-term photo-stability for TiO 2 -based PSCs under full spectral continuous illumination. To solve the issues, here we report dopamine-capped TiO 2 nanoparticles as ETL via chelating effect to improve interfacial binding with perovskite active layer. The introduction of dopamine can substantially reduce oxygen vacancies and suppress deep trap states within TiO 2 . In addition, the terminal amino groups in dopamine can passivate the uncoordinated Pb atoms and decrease the Pb-I/Br antisite defects on the interface of perovskite/TiO 2 . As an interfacial crosslinking agent, dopamine can not only reduce charge-accumulation and charge-recombination rate, but also increase charge-extraction efficiency at the TiO 2 and perovskite interface. Based on the dopamine-capped TiO 2 nanoparticles surface, the corresponding planner Cs 0.05 FA 0.81 MA 0.14 PbI 2.55 Br 0.45 PSCs deliver a power conversion efficiency of nearly 21% with negligible hysteresis . Moreover, unencapsulated devices retain 80% of their initial performance after 1200 h operation under constant full-sun illumination in nitrogen atmosphere. Ideally, this chemical-bath-deposited dopamine-modified TiO 2 provides an effective commercialized route for efficient and photostable planar PSCs.
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高影响因子
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