Environmental Science-Nano
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2019
·Vol. 7
·期 2
·665-675
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IF 7.704
Jun Hou,Tengfei Li,Lingzhan Miao,Guoxiang You,Yi Xu,Songqi Liu
The widespread application of TiO2 NPs will lead to their increasing release into the aquatic environment and thus affects the ecosystem function of aquatic life. As a microbial community, responses of periphytic biofilm to toxicity of TiO2 NPs are largely unknown, in particular with respect to dynamic shifts of community structure and microbial functions of periphytic biofilms. Therefore, this study investigated the relationship between microbial functions and community composition of periphytic biofilms after chronic exposure (21 days) to 50 μg L−1 and 500 μg L−1 TiO2 NPs. The increase of DOC in surface water was inhibited during the first 11 days (49.55%) by 500 μg L−1 TiO2 NPs and then recovered. Distinct responses were observed between community structure and microbial functions of biofilms after exposure to TiO2 NPs. Specifically, both 50 μg L−1 and 500 μg L−1 TiO2 NPs promoted the growth of microalgae (78.85–134.86%) and altered the bacterial community composition at day 7, and these trends lasted at day 21. In terms of the microbial functions determined using Biolog™ ECO microplates, biofilms maintained their total carbon metabolic activities under the stress of 50 μg L−1 TiO2 NPs. However, the carbon metabolic activities were significantly inhibited (24.63%) by the exposure to 500 μg L−1 TiO2 NPs at day 7 and then recovered to the control level at day 21. Although inhibition still existed in the metabolic activity for carbohydrate (17.00%) after long-term exposure, periphytic biofilms exhibited resistance to TiO2 NPs and continuous decrease in nanotoxicity was observed.
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INORGANIC CHEMISTRY COMMUNICATIONS
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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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WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 92
·期 5
·713-721
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IF 1.24
Yunhai Zhang,Shuangxi Zhou,Xin Su,Jimin Xu,Guangze Nie,Yongjun Zhang,Yide He,Shuili Yu
A p-type TiO 2 with Ti vacancies (D-TiO 2 ) was synthesized by a facile solvothermal treatment, and Ag/TiO 2 with different Ag loading amount was prepared through a photo-reduction deposition method. The samples were characterized through scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The adsorption and photocatalytic characteristics of tetrabromobisphenol A (TBBPA) on D-TiO 2 and Ag/TiO 2 were investigated. The adsorption of TBBPA on Ag/TiO 2 was significantly enhanced and was five times greater than that of pure TiO 2 . The increase in pH significantly inhibited the adsorption of TBBPA. The 2%-Ag/TiO 2 nearly completely degraded TBBPA in 10 min under UV–Vis light (λ > 360 nm), and the apparent reaction rate constant ( k app ) reached 0.63 min −1 . The significantly enhanced UV–Vis light catalytic properties of the Ag/TiO 2 in comparison with that of TiO 2 were attributed to the increased adsorption capacity and electron transfer ability of the Ag/TiO 2 . Free radical trap experiments results showed that holes and superoxide radicals play a major role in the catalytic degradation of TBBPA by Ag/TiO 2 . Moreover, the Ag/TiO 2 catalyst exhibits high stability during TBBPA degradation even after three cycles. Practitioner points Ti-defected TiO 2 and Ag/TiO 2 were synthesized using a solvothermal and photo-reduction deposition, respectively. Ag/TiO 2 exhibited outstanding adsorption and photocatalytic activity for TBBPA removal under UV–Vis light. Holes and superoxide radicals play a major role in the photocatalytic degradation of TBBPA.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Bobo Fan,Qi Fan,Lulin Hu,Min Cui,Xueying Wang,Hongmin Ma,Qin Wei
Serum-soluble folate binding protein (FBP) is an important tumor marker, and the development of a simple biosensing method is highly needed. In this work, a photoelectrochemical (PEC) biosensor for the detection of FBP was proposed based on the construction of an antifouling interface and the unique ligand–protein recognition. The PEC sensing platform was prepared by the biomimetic polydopamine (PDA) coating on TiO2 nanotubes arrays (NTAs). A significant PEC enhancement effect was obtained due to the macroporous structures. Excellent antifouling performance was achieved by conjugation of amino-group-terminated 8-arm poly(ethylene glycol) (PEG). The incorporation of folic acid (FA) retains the antifouling property and shows recognition abilities toward FBP. The fabricated PEC biosensor shows good analytical performance. The combination of ligand–protein recognition and a PEC antifouling interface provides a good consideration for the development of FBP biosensors.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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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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FUEL
·
2019
·
IF 5.128
Chen Li,Yuefei Song,Xudong Wang,Quan Zhang
Sulfonated titanium dioxide (S-TiO 2 ) was prepared by the grafting of sulfonic groups onto TiO 2 , and doped into the PVDF-g-PSSA as a highly efficient inorganic additive, thus achieving simultaneous improvement of the proton conductivity and anti-fouling property of the synthesized S-TiO 2 /PPSSA proton exchange membrane (PEM). The S-TiO 2 /PPSSA membrane was implemented in microbial fuel cell (MFC) for the first time, and its physicochemical properties and performance in MFC were studied. A new technique of combining Quartz crystal microbalance with dissipation with membrane spin-coated sensors made by a spin coating method was utilized to provide an insight into the anti-fouling property of the prepared membranes. The implementation of Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy demonstrated TiO 2 was successfully introduced into the sulphonic groups. The S-TiO 2 /PPSSA-5.0 membrane has a significant increase in the water uptake (40.9%) and proton conductivity (0.067 S/cm) compared with the PVDF-g-PSSA membrane. QCM-D results indicated that it has better anti-fouling property than pristine membrane and Nafion 117. Moreover, the MFC with the S-TiO 2 /PPSSA-5.0 membrane exhibited a maximum power density of 130.54 mW/m 2 , very close to that of Nafion 117 (132.02 mW/m 2 ), but had the highest COD removal of 91% and least bio-fouling adsorption. These results demonstrate that the blending of sulfonated organic polymers and sulfonated inorganic additives can improve the electrochemical and anti-fouling properties of the composite membranes, which is a new concept for the preparation of PEM suitable for MFC. The S-TiO 2 /PPSSA-5.0 composite PEM is an appropriate candidate separator for the large-scale application of MFCs.
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Royal Society Open Science
·
2019
·Vol. 6
·期 10
·
IF 2.515
Yongsheng Ling,Guang Wang,Ting Chen,Xionghui Fei,Song Hu,Qing Shan,Daqian Hei,Huajun Feng,Wenbao Jia
BaF2–TiO2 nanocomposite material (hereinafter called the composite) was prepared by a sol–gel method. The composite surface area, morphology and structure were characterized by Brunauer–Emmett–Teller method, X-ray diffraction analysis and a scanning electron microscopy. The results showed that BaF2 and TiO2 form a PN-like structure on the surface of the composite. Composites were used to catalyse the degradation of methyl orange by irradiation with ultraviolet light, γ-rays and an electron beam (EB). It was demonstrated that the composite is found to be more efficient than the prepared TiO2 and commercial P25 in the degradation of methyl orange under γ-irradiation. Increasing the composite catalyst concentration within a certain range can effectively improve the decolorization rate of the methyl orange solution. However, when the composite material is used to catalyse the degradation of organic matter in the presence of ultraviolet light or 10 MeV EB irradiation, the catalytic effect is poor or substantially ineffective. In addition, a hybrid mechanism is proposed; BaF2 absorbs γ-rays to generate radioluminescence and further excites TiO2 to generate photo-charges. Due to the heterojunction effect, the resulting photo-charge will produce more active particles. This seems to be a possible mechanism to explain γ-irradiation's catalytic behaviour.
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Frontiers of Environmental Science & Engineering
·
2019
·Vol. 13
·期 5
·1-11
·
IF 3.883
Hao Xuemin,Wang Guanlong,Chen Shuo,Yu Hongtao,Quan Xie
In this work, a UV-light assisted peroxymonosulfate (PMS) activation system was constructed with the composite catalyst of multi-walled carbon nanotubes (CNT) — titanium dioxide (TiO 2 ). Under the UV light irradiation, the photoinduced electrons generated from TiO 2 could be continuously transferred to CNT for the activation of PMS to improve the catalytic performance of organic pollutant degradation. Meanwhile, the separation of photoinduced electron-hole pairs could enhance the photocatalysis efficiency. The electron spin resonance spectroscopy (EPR) and quenching experiments confirmed the generation of sulfate radical (SO 4 • − ), hydroxyl radical (•OH) and singlet oxygen ( 1 O 2 ) in the UV/PMS/20%CNT-TiO 2 system. Almost 100% phenol degradation was observed within 20 min UV-light irradiation. The kinetic reaction rate constant of the UV/PMS/20%CNT-TiO 2 system (0.18 min −1 ) was 23.7 times higher than that of the PMS/Co 3 O 4 system (0.0076 min −1 ). This higher catalytic performance was ascribed to the introduction of photoinduced electrons, which could enhance the activation of PMS by the transfer of electrons in the UV/PMS/CNT-TiO 2 system.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Anran Zhou,Ruibao Jia,Yonglei Wang,Shaohua Sun,Xiaodong Xin,Mingquan Wang,Qinghua Zhao,Huanhuan Zhu
The technique of coupling photocatalysis and membrane filtration was applied to the abatement of sulfonamide antibiotics in water. TiO 2 photocatalyst has been aroused widespread concern in recent years due to its low price and easy availability. A PVDF-PVP-TiO 2 -Dopamine blend ultrafiltration membrane (PPTD) was first fabricated in this study and removal of sulfadiazine (SD) in water using a PPTD membrane filtration-photocatalysis system was realized. The addition of PVP-TiO 2 -Dopamine increased the porosity and average pore size of membranes, resulting in improved hydrophilicity, flux of modified membranes. In pure water, the SD removal efficiency was 91.4% with a first-order rate constant k 0.0216 min −1 under the optimum conditions ([SD] 0 = 0.4 µmol/L, UV = 125 µW/cm 2 , pH = 7.5 ± 0.1, t = 2 h). Water quality parameters (NO 3 − , Cl − , SO 4 2− , humic acid (HA)) showed quite different effects on SD decontamination. Simulated degradation experiments using real samples demonstrated that PPTD membrane filtration-photocatalysis system has significant potential with regard to controlling SD as pollutants in water. The photocatalytic mechanism characterized using ESR indicated that OH was largely responsible for SD decontamination. The mechanism of the PPTD membrane filtration-photocatalysis system suggests that TiO 2 -Dopamine could exist synergistically through the bidentate structure or the chelated structure, and that OH, O 2 − , HO 2 , H 2 O 2 and 1 O 2 may be produced in the PPTD membrane filtration-photocatalysis system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Jing Lin,Taojin Wang,Jiali Zhou,Xiaodong Wu,Ziran Ma,Shuang Liu
In order to find out the reasons behind the steam-accelerated C 3 H 6 combustion over supported platinum, a Pt@TiO x /TiO 2 catalyst modified by silica (Pt@TiSi) with “super-hydrophilic” surface and metallic platinum sites was synthesized in the present study. In situ spectroscopy analyses excluded the structural change of platinum during reactions, suggesting water has to be involved chemically to accelerate the reactions. By comparing the water response and kinetics of the silica-modified and unmodified samples, a water-mediated O 2 adsorption and activation pathway (HOH···OO* → OOH*) was identified as the origin of the activity bonus induced by steam. Since OOH* formed readily at the interface between platinum and the hydrophilic supports (e.g., TiO x -SiO 2 ), Pt@TiSi exhibited drastically enhanced C 3 H 6 oxidation activity in the presence of moisture. Collectively, this work provides an extensible example about how to fabricate efficient catalysts for reactions with positive H 2 O rate orders, and how to unveil the water effects behind them.
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Biosensors-Basel
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2022
·Vol. 12
·期 10
·865
·
IF 5.743
Yuting Qiao,Xianrong Liu,Zhi Jia,Peng Zhang,Li Gao,Bingxin Liu,Lijuan Qiao,Lei Zhang
Abnormal protein phosphorylation may relate to diseases such as Alzheimer’s, schizophrenia, and Parkinson’s. Therefore, the real-time detection of phosphoproteins in sweat was of great significance for the early knowledge, detection, and treatment of neurological diseases. In this work, anatase/rutile TiO2was in situ grown on the MXene surface to constructing the intercalation structure MXene@anatase/rutile TiO2ternary heterostructure as a sensing platform for detecting phosphoprotein in sweat. Here, the intercalation structure of MXene acted as electron and diffusion channels for phosphoproteins. The in situ grown anatase/rutile TiO2with n-n-type heterostructure provided specific adsorption sites for the phosphoproteins. The determination of phosphoprotein covered concentrations in sweat, with linear range from 0.01 to 1 mg/mL, along with a low LOD of 1.52 μM. It is worth noting that, since the macromolecular phosphoprotein was adsorbed on the surface of the material, the electrochemical signal gradually decreased with the increase of phosphoprotein concentration. In addition, the active sites in the MXene@anatase/rutile TiO2ternary heterojunction and synergistic effect of the heterojunction were verified by first-principle calculations to further realize the response to phosphoproteins. Additionally, the effective diffusion capacity and mobility of phosphoprotein molecules in the ternary heterojunction structure were studied by molecular dynamics simulation. Furthermore, the constructed sensing platform showed high selectivity, repeatability, reproducibility, and stability, and this newly developed sensor can detect for phosphoprotein in actual sweat samples. This satisfactory sensing strategy could be promoted to realize the noninvasive and continuous detection of sweat.Keywords:sweat;phosphoprotein;MXene;anatae/rutile TiO2;intercalation structure;healthcare monitoring
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Wen-bo Tan,Dan Luo,Wei Song,Yan-yan Lu,Nuo Cheng,Jia-bin Zhang,Ting Huang,Yong Wang
Highly efficiently removing hazardous heavy metal ions from water is very important from a viewpoint of maintaining the sustainable development of ecological environment. In this work, a novel adsorbent based on the cellulose acetate (CA) was developed, which was fabricated through the blend electrospinning of CA and titanium dioxide (TiO 2 ) nanoparticles, surface modification by polydopamine (PDA) and then grafted by polyethyleneimine (PEI). The composite CA/TiO 2 electrospun fibers exhibit the porous structure, while the surface modification by PDA-assisted PEI grafting has no apparent effect on morphology of the electrospun fibers. The CA/TiO 2 @PDA@PEI composite fibers show the large number of amine groups, and the surface of the fibers can be positively charged in the acidic solution. Adsorption measurements show that the fibrous membrane samples exhibit excellent adsorption ability toward Cr(VI), and the maximum adsorption capacity is as high as 357.1 mg g −1 at solution pH value of 2, solution temperature of 25 °C. Specifically, about 72.1 % Cr(VI) can be directly reduced to harmless Cr(III) during the adsorption measurement, which is much higher than those of the almost adsorbents reported in literatures. The excellent adsorption/reduction ability endows the fibrous membranes with great potential application in removing highly hazardous Cr(VI) from wastewater.
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