Food Analytical Methods
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2022
·Vol. 15
·期 10
·2830-2839
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IF 3.498
Tang Jing,Li Jie,Liu Tianna,Tang Wenjing,Li Nali,Zheng Shengbiao,Guo Jiahao,Song Changchun
Electrochemical determination of tert-butylhydroquinone (TBHQ) is vital to food safety due to negative health effects; however, bare electrode of traditional electrochemical sensors generally has a narrow linear range and low sensitivity, limiting their practical application. Accordingly, the nano-architecture fabricated with N-doped TiO 2 –carbon nano-composites (TiO 2 /NC) is prepared by the thermolysis of NH 2 functionalized MIL-125(Ti) metal–organic frameworks (NH 2 -MIL-125(Ti)). TiO 2 /NC composites are firstly developed as the electrochemical material for electrochemical determination of TBHQ. The TiO 2 /NC composites with a highly porous structure, excellent conductivity and electron transportation, and large surface area show remarkable electrochemical oxidation ability for TBHQ. Under optimal conditions, TiO 2 /NC composite-modified electrode presents a broader linear response to TBHQ concentration of 0.05–100 μM with the detection limit as low as 4 nM (S/N = 3). Finally, the sensor platform is implemented directly to determine TBHQ in edible oil for evaluation of its practical application. TiO 2 /NC composites sensor fabricated perform larger linear range with high sensitivity and anti-interference properties, which can be used as a potential for electrochemical determination of TBHQ.
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ACS Applied Nano Materials
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2022
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IF 6.14
Yifan Yu,Lu Ma,Linling Qin,Wenxiang Lu,Cheng Zhang,Shaolong Wu,Xiaofeng Li
Photoelectrochemical (PEC) biosensors show great potential in biochemical molecular detection due to the advantages of low background noise, high sensitivity, and easy integration. However, the current PEC glucose biosensors are subject to the deficiencies of the relatively large limit of detection, small detectable range of concentration, and requirement of an operation voltage. Herein, we construct an unbiased glucose biosensor both in three- and two-electrode configurations using a glucose oxidase (GOx)-modified Schottky junction comprised of Au nanoparticle (NP)-decorated TiO2-coated Al films. A wide detectable range of concentration (0.3–104 μM) is achieved at relatively zero bias versus the reference electrode in a three-electrode configuration under AM 1.5G illumination along with a fitted sensitivity of 3780 μA mM–1 cm–2 (in the concentration range of 0.3–1.0 μM) and a limit of detection down to 0.05 μM. The photocurrents corresponding to typical interfering substances (e.g., uric acid and ascorbic acid) are less than 10% of that to glucose. Moreover, the constructed sensor achieves almost no attenuation in photocurrent under light ON/OFF circular irradiation for 30 min and shows a photocurrent around 92% of the initial value after 30-day storage in air at room temperature. The satisfactory sensing performance is ascribed to the following three aspects: (1) the optical absorption is enhanced due to the formation of a plane-parallel resonance cavity and the reduced band gap of the TiO2 material, (2) the separation and extraction of the photogenerated carriers are facilitated due to the Al doping and the embedded Schottky junction, and (3) the carrier transfer from the photoelectrode surfaces into the electrolyte is boosted because of the Au NPs and nanostructured GOx decoration. This work provides an alternative route to prepare high-performance and self-powered glucose sensors for diabetes diagnosis.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xiao Wang,Asad Mahmood,Guanhong Lu,Xiaofeng Xie,Jing Sun
The photocatalytic oxidation (PCO) mechanisms of single aromatic hydrocarbons/NO x gases and the synergistic photocatalytic treatment of their mixtures over TiO 2 (anatase) are proposed by analyzing the evolution of adsorbed and gas-phase intermediates through in-situ FTIR and mass-spectroscopy. Photo-activated surface lattice oxygen of TiO 2 (TiO 2 (·O L )) is found to be a strong oxidant for the PCO of both o-xylene and NO x and their consumption led to the deactivation of photocatalysts. As an important coexist air pollutant, NO is firstly discovered as a helper for the persistent ring-opening and degradation of aromatics including o-xylene, toluene, styrene and benzene. NO 2 , a PCO intermediate of NO, acts as a powerful oxidant for replenishing lattice oxygen of TiO 2 , which guarantees the continuous generation of active TiO 2 (·O L ) and prevents the deactivation of photocatalyst. With the introduction of NO, the PCO efficiency of o-xylene increases from ∼65% to 100% and no performance decay of TiO 2 happens in 6 h. The existence of aromatics prevents the escape of toxic NO 2 into air and promotes the harmless transformation of NO into nitrite/nitrate ions and N 2 . This work outlines the essential role of activation and replenishment of lattice oxygen in the PCO process by analyzing the synergistic and stable photocatalytic treatment of aromatic hydrocarbon/NO x mixtures, which explores the practical potentiality of photocatalysis in air purification.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Jia Li,Huizhu Zhang,Dongxue Yu,Weie Wang,Wei Song,Libin Yang,Xin Jiang,Bing Zhao
Considering the variable valence characteristics of rare earth elements, they can be in a variety of valence forms coexistence. Doping of rare earth element with different valence states may produce different energy levels to tune the semiconductor energy band structure. We utilize rare earth element Ce doping TiO 2 for the development of high-performance semiconductor surface-enhanced Raman scattering (SERS) substrates based on an energy-level tuning strategy. Ce doping not only forms multiple energy levels including Ce 3+ and Ce 4+ metal doping energy levels in the bandgap of TiO 2 , but also enriches the surface state level of TiO 2 itself, which together promote the separation of photogenerated carriers and improve charge transfer efficiency between substrates and absorbed molecules. This endows TiO 2 semiconductor substrate with a higher SERS enhancement factor, which can reach 2.2 × 10 6 . The detectable concentration of methylene blue can be as low as 10 −10 mol/L. Moreover, the semiconductor substrate exhibits excellent uniformity and stability. This study not only provides a new strategy to develop excellent semiconductor SERS substrate with multiple energy levels, but also lays the foundation for promising practical application of semiconductor substrate.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Ling Ding,Ting Xiong,Zhibo Zhao,Jun Liao,Yong Zhang
In this study, Al 2 O 3 -TiO 2 nanocomposite was in-situ fabricated using cross-linking-freeze-drying technology for the separation of U(VI). Al 2 O 3 -TiO 2 nanocomposite exhibited an excellent removal property for U(VI) with a removal efficiency of 97.5% and a maximum adsorption capacity of 586.7 mg g −1 , which exceeded those of other TiO 2 -based adsorption materials. After five cycles, the removal percentage for U(VI) on Al 2 O 3 -TiO 2 nanocomposite still maintained more than 90.0%. The study of isotherm and kinetic demonstrated that the removal behavior of Al 2 O 3 -TiO 2 nanocomposite for U(VI) was monolayer chemisorption . Furthermore, the results of pH zpc , BET, SEM, FTIR and XPS analysis manifested that the interactions between Al 2 O 3 -TiO 2 nanocomposite and U(VI) included electrostatic interaction, surface complexation, oxygen vacancy chemistry and redox reactions . In one word, Al 2 O 3 -TiO 2 nanocomposite was a potential candidate as adsorbent in U(VI)-bearing wastewater remediation owing to its simple preparation method and the excellent removal properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Rui Yu,Yanling Yang,Zhiwei Zhou,Xing Li,Jingfeng Gao,Nan Wang,Jiaqi Li,Yongwang Liu
In this work, a novel ternary heterojunction composite with bismuth oxide (Bi 2 O 3 ), titanium dioxide (TiO 2 ) and reduced graphene oxide (rGO) was produced via a one-step hydrothermal process. The prepared Bi 2 O 3 /rGO/TiO 2 (BRGT) composite possessed a strong visible-light responsiveness and a high separation efficiency of photogenerated carriers, with a specific surface area of 133.1 m 2 /g. The optimal degradation performance towards tetracycline (94.3% removal) was obtained by BRGT-10 with Bi/Ti molar ratio of 10% and mass ratio of graphene oxide/Ti of 5% following conditions of 0.1 g/L BRGT-10 at pH of 6.7. The degradation rate of tetracycline by BRGT was 4.5, 3.8, 1.4, and 1.28 times that of TiO 2 , TiO 2 /rGO, Bi 2 O 3 /TiO 2 , and Bi 2 O 3 /TiO 2 @rGO, respectively. O 2 − radicals and holes play the dominant roles in the photodegradation of tetracycline. Based on density function theory calculation and liquid chromatography-mass spectrometry identification of intermediates, the degradation pathways of tetracycline were mostly attributed to the breakage of carbon-carbon double bonds, nitrogen-carbon bonds and rearrangement of hydroxyl groups, and the decreased toxicity of the formed intermediates was evaluated. The BRGT-10 composite owned optimal reusability and applicability. This study explores a facile synthesis process of ternary heterojunction composite and provides insights into photodegradation mechanism of refractory organics from water under visible-light.
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CHEMOSPHERE
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2022
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IF 8.943
Danchen Zhao,Liushan Jiang,Ruochen Yang,Yue Zhang,Qingxiang Zhou
Polyaniline (PANI) is a useful conductive polymer material, and has good adsorption property, which makes it a good modification material. In this work, for the sake of highly enhancing the utilization of visible region in sunlight and accelerating photocatalytic degradation of tetrabromobisphenol A (TBBPA), a typical polybrominated flame retardant , titanium dioxide nanotube arrays (TiO 2 NTAs) were modified with PANI by chemical and electrochemical polymerization. The coated amount of PANI was controlled via adjusting the polymerization time and the amount of aniline in the electrochemical method . The results demonstrate that the EC-PANI/TiO 2 NTAs (synthesized electrochemically) exhibit higher catalytic activity than bare TiO 2 NTAs and C-PANI/TiO 2 NTAs (synthesized chemically) in photoelectrocatalytic degradation of TBBPA under visible light, and the degradation efficiency for TBBPA could reach 94.37% within 120 min. The improved performance was contributed to the synergetic effect of PANI modification which integrated the broad absorption of PANI in visible light region and high catalytic property of TiO 2 NTAs. Interestingly, it was also found that the degradation efficiency of TBBPA by EC-PANI/TiO 2 was further enhanced by up to 95.74% when the ethanol was present in the reaction system as the hole scavenger. Furthermore, the EC-PANI/TiO 2 exhibited excellent stability after 10 cycling experiments. All the results indicated that this new modified material presented strong potential as a photoelectrocatalyst and had great practical applications in the future.
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JOURNAL OF CATALYSIS
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2022
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IF 8.047
Chaoxin Zhang,Yanmei Huang,Bohang Zhao,Yu Yu,Yifu Yu,Bin Zhang
Photocatalytic nitric oxide (NO) synthesis from air is an attractive way to supersede the conventional nitrogen fixation manufacturing technique accompanied by high energy requirements and greenhouse gas emission. The development of efficient photocatalysts for direct solar-driven N 2 oxidation to NO without external thermal assistance is highly challenged. Here, CuO x clusters decorated TiO 2 nanoflowers with various copper contents are constructed and used for solar-driven air reaction into NO under ambient conditions. When the copper content is 1 wt%, the sample shows the optimal performance with a yield rate of 35.0 mmol m −2 h −1 (7.7 μmol h −1 ) and an apparent quantum efficiency of 1.77% at 365 nm. A series of in situ and ex situ characterizations reveal Cu 2 O species and TiO 2 support form direct Z-scheme heterojunction over 1%Cu-TiO 2 . This heterojunction can promote the adsorption and activation of nitrogen and oxygen reactants, leading to the performance enhancement of NO photosynthesis from air. Also, we proposed a possible NO photosynthesis reaction pathway over 1%Cu-TiO 2 .
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Yisheng Hu,Xiaotian Zhang,Xinyan Zhang,Huimin Feng,Lei Xu
Z-scheme heterojunctions can improve the light energy utilization efficiency of TiO 2 -based semiconductors because of their unique photogenerated carrier transfer pathways. In this study, we used in-situ synthesis strategy to construct a novel π conjugated polymer poly (diphenylbutadiene) (PDPB) doped TiO 2 composite system . The as-synthesized 20 wt% PDPB/TiO 2 heterojunction shows a Rhodamine B degradation rate of 455.5 mg/h/g c under visible light, which is 272% higher than that of bare TiO 2 . The structural characterization and test analysis of the photocatalysts reveal the main reasons of the photocatalytic performance enhancement of PDPB/TiO 2 . The Z-scheme PDPB/TiO 2 heterojunctions possesses both the advantages of type II heterojunction and excellent redox ability of PDPB/TiO 2 system. Moreover, the introduction of PDPB enhances the visible light absorption range and the specific surface area of the catalyst. This work provides a fresh approach for the involvement of organic polymers in the construction of TiO 2 -based heterojunction photocatalysts.
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Molecular Catalysis
·
2022
·
IF 5.089
Yiqing Zeng,Fengye Lyu,Yanan Wang,Shule Zhang,Qin Zhong,Zhaoxiang Zhong
High N 2 O selectivity of MnO x -TiO 2 catalyst hinders its development in ammonia selective catalytic reduction (NH 3 -SCR) of NO x . Herein, a series of MnO x -TiO 2 catalyst with different Mn/Ti ratio were prepared by wet-impregnation method to study the N 2 O formation during ammonia selective catalytic reduction (NH 3 -SCR) of NO x from the perspective of catalyst. It is found that MnO x and TiO 2 species are the mainly redox and acid sites for the NH 3 -SCR denitration reaction over MnO x -TiO 2 catalyst, respectively. As the Mn/Ti ratio increases, MnO x species layer expanded on TiO 2 support, leading to increase of redox sites but decrease of surface acid sites. These changes contribute to the occurrence of the no-selective oxidation of NH 3 on MnO x species and the over-activation of NH 3 at Mn-Ti interface, resulting in the formation of N 2 O via the route of 2NH 3 + 2O 2 → N 2 O + 3H 2 O and 4NO + 4NH 3 + 3O 2 → 4N 2 O + 6H 2 O, respectively. Through this work, it can be speculated that both improving MnO x dispersion and increasing surface acidity of catalyst are feasible strategy for suppressing the N 2 O formation on MnO x -TiO 2 .
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Frontiers in Chemistry
·
2022
·
IF 5.545
Lu Xin-Yang,Li Jing,Kong Fen-Ying,Wei Mei-Jie,Zhang Pei,Li Ying,Fang Hai-Lin,Wang Wei
An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide–TiO2–Au nanocomposite-modified glassy carbon electrode (rGO–TiO2–Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO–TiO2–Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO–TiO2–Au/GCE for ACV. As a result, rGO–TiO2–Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 µl. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1–100 µM, and the detection limit was calculated to be 0.3 µM (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lisha Zhai,Zhiyu Huang,Yuxin Luo,Huiyu Yang,Tonghe Xing,Annan He,Zhenwei Yu,Jie Liu,Xiaofang Zhang,Weilin Xu,Fengxiang Chen
Aramid fiber holds a great potential application in harsh environments like defense and aerospace due to outstanding integrated properties, but it still falls short in poor UV resistance and surface inertness. It is an intriguing but challenging task to obtain high anti-UV efficiency for aramid fiber without compromising the mechanical characteristics. Herein, a uniform and thickness-controlled amorphous TiO 2 coating is chemically-bonded onto aramid fiber surfaces via a modified atomic layer deposition (mALD) strategy. Although mALD TiO 2 has an amorphous structure, its special chemical bonding state similar to LBL enables it to absorb UV light to a certain extent, but at the same time endows it with low photocatalytic activity. In contrast to bare aramid fiber with poor UV resistance and greatly suppressed mechanical performance, the modified aramid fibers with 1000 ALD cycles possesses well-preserved mechanical strength and flexibility. Moreover, they exhibit 54.08% retention of initial tenacity even exposure to UV irradiation with intensity of 4260 W/m 2 at high temperature ( > 200 °C) for 360 min (equals to continuous exposure to strong sunlight irradiation for about 7.5 years), simultaneously retain the excellent laundering durability and lustrousness, demonstrating a significant enhancement in anti-UV efficiency. Such highly anti-UV fibers fabricated by a facile mALD strategy provide a new perspective on designing multifunctional fibers and devices for future innovative applications.
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