The formation mechanism of TiO2 polymorphs under hydrothermal conditions based on the structural evolution of [Ti(OH)h(H2O)6−h]4−h monomers

Zhang, Jun; Sun, Peng; Jiang, Peng; Guo, Zhaoying; Liu, Wenxiu; Lu, Qipeng; Cao, Wenbin

doi:10.1039/c9tc00662a

Cited by 41 publications

(28 citation statements)

References 19 publications

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“…Unlike conventional luminescent materials containing remarkable conjugates, novel unorthodox luminophores, generally bearing electron rich moieties, [1][2][3][4][5][6][7][8][9][10][11][12] have received considerable interest due to their fundamental importance, promising applications, and advantages of prominent biocompatibility, good hydrophilicity, easy preparation, environmental friendliness, etc. [5,6] Despite the great progress already achieved, the exploration of such novel luminophores is still a challenge.…”

Section: Nonconventional Luminophoresmentioning

confidence: 99%

“…[21] It would be even encouraging if the CTE mechanism could be instructive for the discovery and design of new luminophores. So far, most nonconventional luminophores contain aliphatic amine and/or carbonyl moieties, [1][2][3][4][11][12][13][14][15][16][17][24][25][26][27] those with merely oxygen moieties (i.e., ether, hydroxyl) are scarcely touched. According to the CTE mechanism, gathering of sole oxygen moieties could also afford inherent emission.…”

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confidence: 99%

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Emission and Emissive Mechanism of Nonaromatic Oxygen Clusters

Wang

Xin

Chen

et al. 2018

Macromol. Rapid Commun.

147

125

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Nonaromatic luminophores without remarkable conjugates have aroused great attention. Their emission mechanism, however, remains an open question. Meanwhile, previous studies generally focus on aliphatic amine and/or carbonyl-containing systems; those with merely oxygen moieties (i.e., ether, hydroxyl) are scarcely touched. Recently, the clustering-triggered emission (CTE) mechanism is proposed to rationalize the emission of nonconventional luminophores, according to which compounds bearing purely oxygen moieties can also be emissive. To check this conjecture, herein, both nonaromatic compound of xylitol and polymers of PEG and F127 are studied, which are found to be emissive in concentrated solutions and solids. Furthermore, cryogenic-persistent phosphorescence of the compounds and even persistent room temperature phosphorescence of xylitol crystals are observed. Additionally, their potential application as Fe sensors is demonstrated. These results not only verify the rationality of the CTE mechanism but also suggest the possibility to discover and design new luminophores according to it.

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Section: Nonconventional Luminophoresmentioning

confidence: 99%

mentioning

confidence: 99%

Emission and Emissive Mechanism of Nonaromatic Oxygen Clusters

Wang

Xin

Chen

et al. 2018

Macromol. Rapid Commun.

147

125

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“…This observation is in good agreement with previous studies. [26,27] The second order S term and the interaction term (i.e. S 2 and SR) have confidence intervals that span zero asymmetrically and thus were kept in the model as per recommended practice.…”

Section: Statistical Analysis Of Cod Removal Via Ao Treatmentmentioning

confidence: 99%

Combining LC‐OCD analysis with design‐of‐experiments methods to optimize an advanced oxidation process for the treatment of industrial wastewater

et al. 2017

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Advanced oxidation (AO) is widely used as a pre‐treatment and/or polishing step for the treatment of wastewater from industrial processes and the destruction of particular contaminants in water sources. It has a high treatment efficacy for many different compounds and thus is ideally suited as a treatment technology for specialized facilities that receive shipments of wastewater from networks of industrial, manufacturing, and commercial facilities. The primary challenge is how to optimize the process because bulk measurements of organic content (e.g. TOC) give no information about the specific composition and specialized advanced analytical techniques (e.g. LC‐MS) are unsuitable due to the complex composition. In this study, a novel combination of design‐of‐experiments (DOE) methods and LC‐OCD analysis was used with actual wastewater samples in order to optimize the AO treatment conditions in terms of chemical reagent concentrations, develop statistical models of the process, and identify potential mechanisms of COD removal. A significant variation in organic content removal was obtained over the range of conditions tested in the DOE method. For example, the percent removal of organic contaminants in the one wastewater sample varied from a low of 36 % to a high of 82 %. Most importantly, it was found that the treatment performance differed quite significantly for wastewater samples of different composition. The results presented in our study prove the need to dynamically optimize the AO treatment conditions for wastewater sources of different origins. Furthermore, by the application of the LC‐OCD analysis a step‐by‐step mechanism of COD removal was postulated.

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“…Certain polymeric materials have also demonstrated wavelength tunable emission behavior. [5][6][7] The general mechanistic interpretation of this phenomenon is still obscure and considered that surface traps, edge states, and quantum confinement might jointly operate for excitation wavelength tunable emissions. [8] Apart from all that the materials must have energetically different states that can be selectively excited and there must be no transfer of energy among these states.…”

Section: Introductionmentioning

confidence: 99%

Poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) Microspheres with Intrinsic Excitation Wavelength Tunable Multicolor Photoluminescence

Basharat

Liu

Zhang

et al. 2019

Macro Chemistry & Physics

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Functional photoluminescent materials with a tunable multicolor emission without incorporation of metals is the current focus on luminescent materials due to their multifaceted applications. Herein, novel poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) microspheres are synthesized with size distribution of ≈0.8–1.6 µm by reacting hexachlorocyclotriphosphazene and tris(4‐hydroxyphenyl)ethane at different molar ratios under facile conditions. The thermogravimetric analysis shows that the microspheres are highly thermally stable with 10% weight loss at around 500 °C. Fluorescence microscopy results show that the microspheres emit three blue, green, and red colors with an emission maximum at 487, 530, and 623 nm under different excitation wavelengths of 365, 420, and 546 nm, respectively. Furthermore, under UV and visible (365 and 420 nm) excitations, microspheres demonstrate extraordinary photobleaching stability and highly intense luminescence for expending time and repeating excitations. The microspheres also demonstrate semiconductor‐like optical absorption at 235–285 nm with a tail extended to 700 nm. This exploration provides an insight for the preparation of intrinsic superior wavelength tunable multicolor emission materials from phosphazene. These microspheres are potential candidates for anti‐counterfeits, solar cells, full spectrum fluorescence emitters, organic light emitting diodes, biological, catalysis applications and unlock new areas of research on multicolor photoluminescence.

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The formation mechanism of TiO₂ polymorphs under hydrothermal conditions based on the structural evolution of [Ti(OH)_h(H₂O)_6−h]^4−h monomers

Abstract: In the hydrothermal synthesis of TiO2, [Ti(OH)h(H2O)6−h]4−h (h is the hydrolysis ratio) monomers are generated by the dissolution of the precursor containing titanium ions and then, the monomers form TiO2 polymorphs via a condensation reaction.

Cited by 41 publications

References 19 publications

Emission and Emissive Mechanism of Nonaromatic Oxygen Clusters

Emission and Emissive Mechanism of Nonaromatic Oxygen Clusters

Combining LC‐OCD analysis with design‐of‐experiments methods to optimize an advanced oxidation process for the treatment of industrial wastewater

Poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) Microspheres with Intrinsic Excitation Wavelength Tunable Multicolor Photoluminescence

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