MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 9
·2200156
·
IF 4.402
Linghan Deng,Yong Tan,Xingyu Tian,Hongyan Huang,Quanpei Xie,Chaohai Sun,Chuanxiang Qin,Si Cheng
The photocatalytic and inherently hydrophilic characteristic of titanium dioxide (TiO 2 ) make it very suitable for separating oil-in-water emulsion and aqueous pollutants removal. However, the removal of the oily dyes in water-in-oil emulsion usually needs superhydrophobic/superoleophilic membranes. Although surface modification of TiO 2 with fluorinated organic compounds can bring hydrophobicity, the hydrophobic surface would change back to a hydrophilic surface again after light illumination as fluorinated organic molecules are easily photodegraded too. To date, very few reports have successfully fabricated TiO 2 photocatalysts keeping long-term superhydrophobicity after repeatable photodegradation. Herein, an approach to fabricate polyvinylidene fluoride (PVDF)/polytetrafluoroethylene (PTFE) @TiO 2 nanofibrous membranes through dehydrofluorination and one-pot hydrothermal process, which possess stable superhydrophobicity in various harsh environments, is reported. For the first time, PTFE is bonded with PVDF through dehydrofluorination which induces crosslinking between PTFE and PVDF chains. Owing to the existence of PTFE, extensive hydrophobic TiO 2 can be in situ grown on the rough surface of PVDF/PTFE nanofibers through one-pot hydrothermal process. These features ensure that the membranes possess durable and high-efficient water-in-oil emulsion separation and photodegradation performance. The photodegradation efficiency of the PVDF/PTFE@TiO 2 membranes for oil-soluble dyes remains above 95% even after ten cycles.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 8
·49898
·
IF 2.52
Shuxiao Wang,Xiaoyan Wang,He Huang
The efficient surface modification of titanium dioxide (TiO 2 ) particles with different sizes was first carried out with “water only method” (Appl. Surf. Sci. 2018, 447, 664–672) developed in our group using 12-hydroxy stearic acid (12-HSA) as the modifier. The 12-HSA-modified TiO 2 particles with different sizes were then used to explore their effect on the mechanical and thermal properties of a thermoplastic polyurethane urea (TPUU) elastomer with superior mechanical and thermal properties produced newly in our lab using nonsymmetric alicyclic diisocyanate and diamine. Orthogonal experimental results showed that the order of impact of each factor on the modification efficiency of TiO 2 particles was: Temperature > time > modifier content. It was found that, in the nanometer (≤100 nm) range, smaller particles were more helpful to enhance the tensile strength of the TPUU elastomer, while larger ones to increase more significantly the elongation at break. Besides, the TiO 2 /polyurethane urea nanocomposites exhibited much better thermomechanical performance than the pristine TPUU elastomer, and the thermomechanical performance of the nanocomposites increased with decreasing particle size.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 4
·2594-2603
·
IF 2.599
Xiong Lei,Zhan Feng,Liang Hongbo,Chen Liang,Lan Daosong
The interface in carbon fiber (CF)-reinforced polymer composites plays an important role in determining the mechanical properties of composites. In order to improve the interfacial adhesion between the carbon fiber and resin matrix, we presented a facile and rapid method for grafting nano-sized titanium dioxide (nano-TiO 2 ) onto the CF surface by means of thiol–ene click chemistry under UV irradiation. Experimental results demonstrate that the chemical bonds are formed between the CF and nano-TiO 2 . The introduction of nano-TiO 2 significantly enhances the surface energy of fiber and increases the wettability and mechanical interlocking between fiber and resin, resulting in a significant increase in the interfacial properties of composites. Compared to the raw CF/epoxy composites, the composites reinforced by the CF grafted with nano-TiO 2 show an improvement of 78% in the interfacial shear strength. Moreover, the results of the mechanical properties tests reveal that the flexural strength and tensile strength of composites increase by 32.3 and 39.6% after grafting with nano-TiO 2 .
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Surfaces
·
2026
·Vol. 9
·期 2
·35
·
IF 2.7
Zhaoqing Xia,Yukai He,Lin Lv,Huan Niu,Zebin Zheng,Xiaoshan Liu,Wenjing Dong,Xunying Wang,Houzhao Wan,Guokun Ma,Hao Wang
Charge-trapping memory (CTM) exhibits significant potential in high-density memory, yet reliability degradation resulting from the coupling of program/erase (P/E) cycles and electrical stress remains a key bottleneck for large-scale commercialization. This study focuses on a Au/Al2O3/TiO2/p-Si CTM device, systematically investigating the device failure mechanism under continuously operating P/E cycles and constant voltage stress (CVS), with emphasis on elucidating the synergistic effect of bulk and interface defects on performance decay. Mechanistically, oxygen vacancies in TiO2serve as defect precursors, which form Frenkel pairs under electric field stress and further promote the formation of new defect precursors, thereby driving a self-sustaining defect evolution process. Interface traps, by contrast, arise from the cleavage of interfacial Si-H bonds triggered by electric field stress, resulting in a net elevation of the interface state density. The passive effects from the bulk and interface defects may give rise to issues, such as threshold voltage drift and decreased P/E speed. This work provides in-depth insights into the device failure mechanism of CTM, offering critical theoretical support for optimizing fabrication processes and enhancing long-term reliability.
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高影响因子
ACS Catalysis
·
2019
·
IF 12.221
Wenhui Li,Guanghui Zhang,Xiao Jiang,Yi Liu,Jie Zhu,Fanshu Ding,Zhongmin Liu,Xinwen Guo,Chunshan Song
Cobalt catalysts supported on TiO2 with different crystal forms (anatase and rutile) differ sharply in CO2 conversion and product selectivity for CO2 hydrogenation. The Co/rutile-TiO2 catalyst selectively catalyzed CO2 hydrogenation to CH4, while CO is the main product on the Co/anatase-TiO2 catalyst. In situ DRIFT (diffuse reflectance infrared Fourier transform) results have partially revealed the reaction pathway of CO2 hydrogenation on these two catalysts. On Co/rutile-TiO2, the reaction proceeds through the key intermediate formate species, which is further converted to CH4. Differently, the reaction on Co/anatase-TiO2 undergoes CO2 → *CO, which desorbs to form gas-phase CO instead of subsequent hydrogenation. The strongly bonded *CO is required to enhance the subsequent hydrogenation. By simply changing the calcination temperature of anatase TiO2, the product selectivity can be tuned from CO to CH4 with a significant increase in CO2 conversion due to the surface phase transition of the anatase to the rutile phase. The addition of Zr, K, and Cs further improves the CO, CO2, and H2 adsorption in both the capacity and strength over anatase- and rutile-supported catalysts. The Zr modification makes the reaction pathway over anatase-supported catalyst proceed via the intermediate formate species and enables the subsequent hydrogenation to CH4. In addition, the surface C/H ratio increases significantly in the presence of promoters (unpromoted < Zr-promoted < K-Zr-promoted ∼ Cs-Zr-promoted), which leads to the highest C2+ selectivity of 17% with 70% CO2 conversion over K-Zr-Co/anatase-TiO2 catalyst. These results reveal mechanistic insights into how the product distribution of Co/TiO2 catalysts can be manipulated through adjusting the adsorption performance and surface C/H ratio.
研究领域:
催化化学
·
材料化学
·
多相催化
·
CO2利用
·
表面科学
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhixiang Ren,Ao Li,Xinyu Lei,Zhengwei Yu,Guangying Wang,Hongliang Zhang,Huan Chen,Yin Wang,Hongming Long
As a mainstream moderate-high temperature (250–420 °C) particulate denitrification catalyst, V 2 O 5 -WO 3 /TiO 2 (VWT) is not applicable to low-temperature (60–150 °C) iron ore sintering flue gas after semi dry/wet desulfurization. In order to improve the NH 3 -deNO x performance of the VWT particle catalyst at low temperatures, a series of powder VWT denitrification catalysts doped with different content of RuO 2 (R-VWT) prepared by the wet co-impregnation method were researched, and found that the particulate catalyst service temperature (about 100 % NO conversion) is lowered from 225 °C (VWT) to below 175 °C by doping 0.5 % RuO 2 . In addition, a series of characterizations indicate that the doped RuO 2 enhances the redox performance of R-VWT and promotes the generation of more surface active intermediate monodentate nitrate, and accelerates the low-temperature surface SCR transient reaction rate.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19915-19926
·
IF 3.925
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen
Clean and sustainable photoelectric technology has been developed rapidly in many fields. One of which is the novel marine corrosion protection technology that directly utilizes the abundant solar energy falling on the ocean to provide photoinduced cathodic protection for metallic structures, and has received increasing attention year by year. Improving the photoelectrochemical conversion and photoelectric cathodic protection performance for metals under sunlight is vital for achieving effective protection. In particular, optimizing the multi-dimensional nanostructured photoanode to accelerate the collection and transfer of photogenerated electrons and to improve the photoelectric and cathodic protection performance is a promising method. Here, an ultrafine branched anatase TiO2 nanolawn (NL) photoanode co-decorated with CdS nanoparticles and reduced graphene oxide quantum dots (rGO QDs) was prepared. Compared with single CdS modified TiO2 NL, the three-phase junction CdS/rGO QDs/TiO2 NL shows further enhanced photoelectrochemical conversion performance under simulated sunlight and visible light irradiation, increased by 66.7% and 83.3% compared to that of CdS/TiO2 NL, respectively. The rGO QDs, which acted as a high-efficiency electron transporter, are uniformly deposited on the TiO2 NL, and further promote the transport efficiency of photogenerated electrons. CdS as a visible-light responder is responsible for broadening the spectral response, and the ultrafine branched TiO2 NL substrate greatly expands the photon capture area and increases the electron collection sites. Finally, the synergy of the above three aspects ensures that the ternary CdS/rGO QDs/TiO2 NL photoanode exhibits further enhanced simulated sunlight-driven and visible light-driven photoelectric conversion efficiency and a photoinduced cathodic protection effect on 316L stainless steel and pure copper.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xuejing Xiao,Ruixue Guo,Yumeng Qi,Junyan Wei,Nannan Wu,Shengnan Zhang,Ruijuan Qu
In this study, TiO 2 nanospheres prepared by the sol-gel method were found to efficiently catalyze the photodegradation of 1-butyl-2,3-dimethylimidazolium bromide salt ([BMMIm]Br) under simulated solar irradiation through the main attack of hydroxyl radicals (•OH). The promoting effect of alkali metal (Li + →Cs + ) and alkaline earth metal ions (Mg 2+ →Ba 2+ ) was particularly emphasized. In-situ EPR tests showed that the introduction of alkali and alkaline earth metal ions could enhance the formation of •OH thus leading to a 7%−30.3% increase in the degradation efficiency of. [BMMIm] + . Moreover, the removal efficiency of [BMMIm] + still reached > 96.19% in four real waters. A total of 23 products of [BMMIm]Br were detected, and hydroxyl substitution, bond breaking, direct oxidation and ring opening were considered as the main reactions during the photocatalytic degradation process. The results of toxicity evaluation showed that hydroxylation was a reaction process of increasing toxicity, while the bond breaking reaction had great detoxification capacity for [BMMIm] + . These findings may enhance our understanding on the effects of alkali or alkaline earth metal ions on the photocatalytic activity of TiO 2 , which could also provide reference for the efficient and green removal of alkylimidazolium ionic liquids in waters.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiaqing Liu,Jun Wan,Lin Liu,Weijie Yang,Jingxiang Low,Xiaoming Gao,Feng Fu
Aiming to the unwanted photocatalytic hydrogen production systems using sacrifice agents, a well-design S-scheme O-ZnIn 2 S 4 /TiO 2- x heterojunction was fabricated to realize photocatalytic hydrogen production via water reduction coupled with organic oxidative dehydrogenation. As supported by DFT calculations and experimental analysis, owing to the synergistic effect of oxygen defect and doping engineering, a tailored energy band structure alignment with higher redox potentials and larger Fermi level potential difference are achieved, resulting in more efficient S-scheme interface charge transfer and separation efficiency, thus improving the photocatalytic activity of O-ZnIn 2 S 4 /TiO 2- x . The optimal O-ZnIn 2 S 4 /TiO 2- x photocatalyst shows remarkable H 2 and benzaldehyde production rate of 2584.9 μmol g -1 h −1 and 2880.5 μmol g -1 h −1 under visible light, which are 52.5 and 66.4 times as high as those over blank TiO 2 . Interestingly, this coupled reaction system also displays superior H 2 evolution activity compared to sacrificial reagent systems of Na 2 SO 3 /Na 2 S and triethanolamine. Further quenching and EPR experiments reveal that both water and organic molecules provide protons for H 2 production.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Da Wang,Yinning He,Na Zhong,Zhiqiao He,Yi Shen,Tao Zeng,Xiaohui Lu,Jun Ma,Shuang Song
This study investigated the simultaneous photoelectrochemical (PEC) degradation of carbamazepine (CBZ), reduction of CO 2 and production of H 2 using a TiO 2 thin film as photoanode and Ag plate as cathode . The photoanode was fabricated using sequential hydrothermal and calcination processes. The use of chloride during the hydrothermal process enhanced formation of oxygen vacancies and defects on the TiO 2 surface. Calcination not only further strengthened those features but also enhanced the crystallinity and anatase/rutile ratio, endowing the TiO 2 photoanode with superior PEC capacity. Characterization of physicochemical and PEC properties revealed that photogenerated electrons-holes were rapidly generated and efficiently separated on the TiO 2 surface during the PEC process. Hydroxyl radicals were the main active species responsible for anodic oxidation of carbamazepine, while hydrogen radicals and carbon dioxide radical anions mediated CO 2 reduction and H 2 production in the cathodic process. This work confirms the suitability of the prepared TiO 2 photoanode for PEC degradation of organic pollutants coupled with CO 2 reduction and H 2 production.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Haiwang Wang,Li Chao,Xinfang Wei,Jinlong Li,Cheng Ji,Bingzhu Wang,Xiwei Qi,Pengcheng Hu,Yifan Ying,Mengping Tian
Nowadays, the polymer flocculation technology has been widely used in the treatment of oil sand tailings pollutants. However, the most commonly used polyacrylamide flocculant has encountered some problems, such as low flocculation efficiency and severe secondary pollution. In this paper, an organic-inorganic composite high-efficiency flocculant with self-degradation was designed and prepared. Furthermore, in order to analyze the synthesis mechanism of the composite material, the functional groups of the material were investigated by Fourier transform infrared spectroscopy (FTIR). At the same time, the morphology and structure were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Meanwhile, the crystal structure was recorded by XRD . In addition, the flocculation efficiency of the composite flocculant was determined by measuring the turbidity removal of the kaolin suspension. Apart from this, the flocculation parameters were optimized by central composite design (CCD) experimental design and response surface methodology (RSM). Finally, the self-degrading property of the flocculant was tested under light conditions. The characterization data of the material indicated that the synthesis mechanism is that under the ultraviolet light condition, the acrylamide monomer undergoes free radical polymerization under the action of active free radicals on the surface of the core-shell structure SiO 2 -TiO 2 to form an organic-inorganic composite flocculant. In addition, the optimized experimental results showed that the optimal turbidity removal conditions were followed: V TBOT /m SiO2 of 6.66 mL/g, flocculant dosage of 50 ppm and kaolin suspension concentration of 1.5 wt%. Ultimately, the degradation experiment showed that the prepared organic-inorganic composite flocculant has nice self-degradation performance, and the self-degradation efficiency reaches over 90% within two hours. In summary, this work has greatly enriched the knowledge of oil sand tailings treatment.
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高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 6
·1568-1578
·
IF 4.4
Qifeng Chen,Peng Zheng,Haodi Liu,Yuanrong Zhang,Shuaitao Li,Hongpian Guo,Yanfen Fang,Xun Hu,Ran Duan
The combination of photocatalytic dehalogenation of halogenated aromatics and C–C coupling synthesis of valuable organics is an interesting method for the elimination of pollutants and synthesis of valuable chemicals. Herein, we present a green method for the photocatalytic dehalogenation of benzyl bromide and selective coupling synthesis of bibenzyl achieved on the dual active sites of single-atom Cu and surface oxygen vacancies (VOS) generated in situ on ultrathin 2D-TiO2(B) nanosheets. The experimental results show that single-atom Cu sites on ultrathin TiO2(B) nanosheets can improve charge transfer and separation efficiency and stabilize VOS formed in situ; the presence of VOS not only improves light absorption capacity but also favors the adsorption of reactant benzyl bromide molecules. More importantly, the dual sites of single-atom Cu and adjacent VOS form a solid frustrated Lewis pair, favor the adsorption of benzyl bromide molecules, activate the C–Br bond, and boost the C–C coupling synthesis of bibenzyl. This work provides a novel insight into photocatalytic C–C coupling through the synergistic effect of single-atom Cu and VOS on ultrathin nanosheet photocatalysts.
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