APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiuxuan Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
ZIF-derived N-doped carbon (CN) materials were modified in this work by TiO 2 nano-islands with oxygen vacancies (O V ) through a sol-gel method and subsequent thermal treatment. By loading Pd nanoparticles (NPs) on CN@TiO 2 , Pd@CN@TiO 2 catalysts were fabricated. Superior catalytic performance of Pd@CN@TiO 2 was found in the selective phenol hydrogenation to cyclohexanone , with a TOF of 30.1 h −1 , 2.2-fold as high as that of Pd@CN. The synergistic effect of CN and TiO 2 nano-islands was responsible for the superior catalytic performance. More O V was generated due to the high specific surface area of CN. At the same time, CN could also enhance the hydrophilicity , and adsorb more phenol in non-planar fashion. The TiO 2 nano-islands with O V could improve the Pd dispersion, make more Pd element on the support surface, strengthen the antioxidizability of Pd and induce electron-rich Pd NPs. Furthermore, the as-fabricated Pd@CN@TiO 2 showed good recyclability in the phenol hydrogenation, and also exhibited excellent catalytic performance in the catalytic hydrogenation of phenol with diverse functional groups. These findings provide the feasibility of using the high-performance catalysts for the hydrogenation of phenol derivatives.
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Polymers
·
2019
·Vol. 11
·期 8
·1293
·
IF 3.164
Xuejuan Shi,Xiaoxiao Zhang,Liang Ma,Chunhui Xiang,Lili Li
Chitosan/cellulose acetate (CS/CA) used as a biopolymer systema, with the addition of TiO2as photocatalyst (C-T/CA) were fabricated by alternating electrospinning/electrospraying technology. The uniform dispersion of TiO2and its recovery after the removal of methyl orange (MO) was achieved by incorporating TiO2in CS electrosprayed hemispheres. The effects of pH values, contact time, and the amount of TiO2on adsorption and photocatalytic degradation for MO of the C-T/CA were investigated in detail. When TiO2content was 3 wt %, the highest MO removal amount for fiber membranes (C-T-3/CA) reached 98% at pH value 4 and MO concentration of 40 mg/L. According to the data analysis, the pseudo-second-order kinetic and Freundlich isotherm model were well fitted to kinetic and equilibrium data of MO removal. Especially for C-T-3/CA, the fiber membrane exhibited multiple layers of adsorption. All these results indicated that adsorption caused by electrostatic interaction and photocatalytic degradation were involved in the MO removal process. This work provides a potential method for developing a novel photocatalyst with excellent catalytic activity, adsorbing capability and recycling use.Keywords:TiO2;chitosan;electrospinning;electrospraying;methyl orange;photocatalytic degradation
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Materials Research Express
·
2019
·Vol. 6
·期 9
·0950c3
·
IF 1.449
Qianzhu Mu,Yanfeng Sun,Aiying Guo,Xiazhao Yu,Xiaoyue Xu,Aijun Cai,Xiuping Wang
A series of Fe3O4–TiO2 composites were successfully synthesized using Chlorella pyrenoidosa as a bio-template. C. pyrenoidosa is not only a promising bio-template for obtaining Fe3O4 and TiO2 nanoparticles (NPs) but is also a natural dye sensitizer source that improves the photocatalytic activity of the TiO2 NPs under visible light. The bandgap energy of Fe3O4–TiO2 is narrower than that of TiO2 due to the coupling between the Fe3O4 and TiO2 NPs. The coupling and dye-sensitization lead to the rapid separation and suppressed recombination of electron-hole pairs in Fe3O4–TiO2, which enhances the photocatalytic activity of TiO2 under visible light. The photocatalytic activity of the as-prepared composites was evaluated by degrading a rhodamine B (RhB) aqueous solution under visible-light irradiation. Fe3O4–TiO2 exhibits a high degradation efficiency for RhB, and can be withdrawn from solution easily using an external magnetic field.
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Materials Express
·
2019
·Vol. 9
·期 4
·319-327
·
IF 1.465
Zhen Deshuai,Zhong Fenfen,Yang De,Cai Qingyun,Liu Yu
A novel photoelectrode of ternary CdS/Au/TiO2 nanotube array, fabricated by electrodeposition technique and successive ionic layer adsorption and reaction (SILAR) method, shows strong photon absorption capacity and active charge transfer efficiency. A photoelectrochemical
aptasensor was developed to detect cytochrome c (cyt c) by decorating a HS-aptamer on the CdS/Au/TiO2 photoelectrode. Due to the specific binding between the cyt c and aptamer, the cyt c-aptamer complex formed and enhanced the steric hindrances and reduced the e/h
+
lifetimes, which result in a decrease in the photoelectrical current intensity. Cyt c is, therefore, also quantified based on the decrease in photoelectrical current. The developed aptasensor shows a high specificity and a high sensitivity towards to the cyt c, giving a linear range from 5
pM to 100 nM, and a limit of detection of 3.45 pM.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chao Yang,Na Han,Changye Han,Menglu Wang,Wenxin Zhang,Weijing Wang,Zongxuan Zhang,Wei Li,Xingxiang Zhang
Extremely asymmetric wettability, high wetting selectivity, instantaneous superwetting behaviors (low transmembrane resistance), and superior resistance to chemicals and solvents are needed for Janus membranes for switchable oil/water separation. However, it is still challenging to obtain Janus membranes with such properties. In this study, a surface with metastable hydrophobicity is constructed on one side of the chemically stable superhydrophilic TiO2@PPS membrane by adjusting the hydrophobization depth and the morphology of the hydrophobic layer via a water–oil interfacial grafting. The prepared Janus membrane exhibits a high water contact angle difference of ∼150° between its two surfaces with maintaining the superior penetrability of the original membrane, which makes it capable to separate both oil-in-water and water-in-oil emulsions with high fluxes and accuracy. The separation efficiency is higher than 98% for the separation of the two kinds of emulsions. The fluxes of the surfactant-free toluene-in-water and water-in-toluene emulsions are up to 6.4 × 102 and 9.5 × 102 L m–2 h–1, respectively. Furthermore, the Janus membrane exhibits desirable antifouling performance and reusability during usage.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Boqiong Jiang,Beilong Lin,Zhiguo Li,Shuang Zhao,Ziying Chen
A series of Mn/TiO 2 catalysts were prepared by ultrasonic spray pyrolysis (USP) method for selective catalytic reduction (SCR) of NOx from flue gas at low temperatures. The highest activity of Mn/TiO 2 was obtained with a Mn/Ti ratio of 0.5. When Fe was doped into Mn(0.5)/TiO 2 , the NOx conversion rate on Fe(0.05)-Mn(0.5)/TiO 2 was increased by approximately 10 % at 120–180 °C. The samples were characterized by XRD , SEM , H 2 -TPR, and N 2 adsorption analyses. Results revealed that Mn(0.5)/TiO 2 with Mn/Ti ratio of 0.5 presented the lowest crystallinity , the highest surface area, and the highest redox ability. Although the surface area was significantly decreased by Fe doping, it also reduced the crystallinity and crystal size of the catalysts, thereby increasing the O concentration on the surface of catalyst. Moreover, Fe(0.05)-Mn(0.5)/TiO 2 displayed a higher redox ability than the other catalysts. At 120–240 °C, the activation energy decreased from 27.65 kJ/mol on Mn(0.5)/TiO 2 to 14.46 kJ/mol on Fe(0.05)-Mn(0.5)/TiO 2 , thereby facilitating the activation of the reaction on Fe(0.05)-Mn(0.5)/TiO 2 . Despite that the NO and NH 3 adsorptions were lower on Fe(0.05)-Mn(0.5)/TiO 2 than on Mn(0.5)/TiO 2 , the intermediates on Fe(0.05)-Mn(0.5)/TiO 2 , particularly nitrates, were easily activated to participate in the reaction, leading to increasing catalytic activity.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Jiajia Sun,Sheng Feng,Shanshan Feng
A novel ternary heterojunction MWCNT/N-TiO 2 /UiO-66-NH 2 was synthesized by in-situ solvothermal-hydrothermal approach, showing superior photocatalytic degradation of KET under visible-light irradiation. The optimal MWCNT/N-TiO 2 /UiO-66-NH 2 (3:7) composite exhibits the highest degradation efficiency of KET (96%) in 120 min in comparison with pristine TiO 2 , N-TiO 2 , MWCNT , UiO-66-NH 2 and MWCNT/N-TiO 2 . The improved photocatalytic activity of MWCNT/N-TiO 2 /UiO-66-NH 2 can be ascribed to its improved visible-light absorption range, the large specific surface area based on UiO-66-NH 2 as well as the formation of an effective heterojunction. The formed ternary composite facilitates the separation and transfer of photoexcited charge carrier, which is confirmed from the results of PL. The photocatalytic mechanism is further proposed based on the trapping experiment, and the transfer process of photoinduced electron-hole pairs is discussed. This work provides an effective strategy for designing a new ternary photocatalytic system toward degradation of organic pollutants.
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CATALYSIS TODAY
·
2020
·
IF 5.825
Zhen-Hong He,Chong-Shan Jiang,Kuan Wang,Zhong-Yu Wang,Na Li,Wei-Tao Wang,Zhao-Tie Liu
Catalytic conversion of CO 2 into methanol is of particular interest as it does not only provide valuable methanol, but also utilize the waste CO 2 . In the present work, a CoO/Co/TiO 2 catalyst was developed and utilized in catalyzing CO 2 to methanol under photothermal conditions. From the results of characterization, the supported Co nanoparticles (NPs) were composed of Co 0 in the bulk, CoO film formed from air oxidation on the surface, and Co 0 at Co NPs-TiO 2 interfaces. This structure provided the possibility for a Z scheme photothermal catalytic system, which revealed a high activity for methanol formation in aqueous media under atmosphere pressure. It was proposed that the light excited electrons from the valence band (VB) of TiO 2 , and the excited electrons could enhance the Co 0 catalytic activity under thermal conditions. The present approach will offer a new strategy to design Co based Z scheme catalysts and further improve the conversion efficiency from CO 2 to fuels.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xiaohui Wu,Leitao Cao,Jun Song,Yang Si,Jianyong Yu,Bin Ding
TiO 2 -based fibrous membranes as plasmonic heterojunction photocatalysts would hold great promise in the field of water disinfection , however, it still existed a great challenge to design and construct such materials. Here, we presented the fabrication of continuous, hierarchical, and easy-to-recycle flexible Ag 2 C 2 O 4 /TiO 2 heterostructured nanofibrous membranes (NMs) that were composed of thorn-like nanofibers through electrospinning technique followed by successive ionic layer adsorption and reaction (SILAR) process. Ag 2 C 2 O 4 nanoplates were firmly anchored on the surface of TiO 2 and the obtained Ag 2 C 2 O 4 /TiO 2 heterojunction photocatalysts underwent a silent-to-active transition of visible-light response under light irradiation due to the surface plasmon resonance (SPR) effect of Ag nanoparticles derived from Ag 2 C 2 O 4 , forming a new plasmonic heterojunction photocatalyst. By virtue of the hierarchical structure, enhanced visible light absorption and efficient charge carriers separation, Ag 2 C 2 O 4 /TiO 2 NMs possessed high bactericidal efficiency of >99.999% within 30 min, strong reactive oxygen species (ROS) producing capability (1510 μg g −1 and 659 μg g −1 for superoxide radicals and hydroxyl radicals , respectively), and good reusability. This work may offer new insights into the design of antibacterial materials for pathogenic microorganism-contaminated water purification .
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APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2018
·Vol. 84
·期 9
·
IF 3.633
Peng Zhang,Jin-Song Guo,Peng Yan,You-Peng Chen,Wei Wang,You-Zhi Dai,Fang Fang,Gui-Xue Wang,Yu Shen
Pollutant degradation is present mainly in the surface layer of biofilms, and the surface layer is the most vulnerable to impairment by toxic pollutants. In this work, the effects of nanosized TiO2 (n-TiO2) on the average thicknesses of Bacillus subtilis biofilm and on bacterial attachment on different surfaces were investigated. The binding mechanism of n-TiO2 to the cell surface was also probed. The results revealed that n-TiO2 caused biofilm dispersal and the thicknesses decreased by 2.0 to 2.6 μm after several hours of exposure. The attachment abilities of bacteria with extracellular polymeric substances (EPS) on hydrophilic surfaces were significantly reduced by 31% and 81% under 10 and 100 mg/liter of n-TiO2, respectively, whereas those of bacteria without EPS were significantly reduced by 43% and 87%, respectively. The attachment abilities of bacteria with and without EPS on hydrophobic surfaces were significantly reduced by 50% and 56%, respectively, under 100 mg/liter of n-TiO2. The results demonstrated that biofilm dispersal can be attributed to the changes in the cell surface structure and the reduction of microbial attachment ability.IMPORTANCE Nanoparticles can penetrate into the outer layer of biofilm in a relatively short period and can bind onto EPS and bacterial surfaces. The current work probed the effects of nanosized TiO2 (n-TiO2) on biofilm thickness, bacterial migration, and surface properties of the cell in the early stage using the surface plasmon resonance waveguide mode. The results demonstrated that n-TiO2 decreased the adhesive ability of both cell and EPS and induced bacterial migration and biofilm detachment in several hours. The decreased adhesive ability of microbes and EPS worked against microbial aggregation, reducing the effluent quality in the biological wastewater treatment process.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Junwei Yin,Zipeng Xing,Junyan Kuang,Zhenzi Li,Meng Li,Jiaojiao Jiang,Siyu Tan,Qi Zhu,Wei Zhou
Bi plasmon-enhanced mesoporous Bi 2 MoO 6 /Ti 3+ self-doped TiO 2 microsphere heterojunctions (Bi-BMO/TiO 2-x ) have been synthesized by a mild hydrothermal method combined with an in situ solid-state chemical reduction process, and subsequently annealed at 400 °C in N 2 atmosphere. The prepared Bi-BMO/TiO 2-x photocatalysts are characterized by X-ray diffraction, N 2 adsorption, scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. The results reveal that Ti 3+ self-doped TiO 2 is loaded on surface of mesoporous Bi 2 MoO 6 microsphere efficiently and metallic Bi is produced for surface plasmon resonance (SPR). Under visible-light irradiation, the heterojunctions photocatalyst shows excellent photodegradation and photoelectrochemical properties of ∼95% for phenol removal rate and 20 μA/cm 2 for photocurrent density, respectively, which is several times higher than that of single component. Moreover, it also has high photocatalytic oxygen production with a rate of 134 μmol h -1 g -1 . The enhanced photocatalytic activities are mainly attributed to the existence of Ti 3+ self-doping and heterojunction structure, which narrow the band gap to extend photoresponse to visible light region. Another reason is the influence of SPR of metallic Bi. They all promote the spatial separation and transfer of photogenerated charge carriers.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Di Zhang,Pin Ma,Shuo Wang,Mingpeng Xia,Sidong Zhang,Dongmei Xie,Xiaowen Zhou,Yuan Lin
Recently, the pre-synthesized oil-soluble quantum dots (QDs) have triggered great interests due to advantages of monodispersity, stability and easy synthesis. Aggregation of QDs is the reason for low loading and poor efficiency during the in situ ligand exchange linker-assisted assembly process of preparing photovoltaic devices. In this work, we modify TiO 2 films with 4-mercaptobenzoic acid (MBA) as linkers and adjust modification time (MT) of MBA on the surface of TiO 2 films. As the MT increases from 0 to 6 min, even 360 min, loading amount of QDs and photovoltaic performance improve first and then decrease. The results of line scan in cross-sectional view of photoanodes show that QDs uniformly distribute throughout the short-MT films thickness, while obvious aggregation occur in the surface of long-MT films. The best device with 3 min of MBA modification exhibits an optimal efficiency of 5.58%.
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