Investigating the synergistic effects in tourmaline/TiO2-based heterogeneous photocatalysis: Underlying mechanism insights

Yu, Li; Wang, Cuiping; Chen, Feiyang; Zhang, Jiaqi; Ruan, Yuefei; Xu, Jian

doi:10.1016/j.molcata.2015.10.006

Cited by 49 publications

(11 citation statements)

References 34 publications

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“…These uses include applications such as acoustic wave sensors, photocatalysis, modification of glass properties and hazardous-waste remediation (e.g. Wang et al 2014;Xu et al 2014;Yu et al 2016;Zhang et al 2016;Zu et al 2016). The future of these types of applications is promising, but large-scale deployment is uncertain.…”

Section: Current Trends and Future Possibilitiesmentioning

confidence: 99%

Tourmaline studies through time: contributions to scientific advancements

Henry¹,

Dutrow²

2018

Jour. Geosci.

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Tourmaline studies have been an integral part of science and scientific exploration for centuries and continue to flourish today. In the 19 th century, the curious pyroelectric and piezoelectric properties of this mineral attracted the attention of scientists who considered tourmaline central to a grand unification of the theories of heat, electricity and magnetism. The common occurrence of tourmaline in granites and granitic pegmatites was widely known at that time, but, subsequently, tourmaline was discovered in a great range of igneous, metamorphic and sedimentary rocks and a variety of ore deposits, including hydrothermal systems. The chemical complexity of this mineral became more fully established and "appreciated" by the end of the 19 th century. In the early-and mid-20 th century, tourmaline studies greatly expanded as a consequence of the (1) exploration of wider ranges of geological settings, (2) development of instrumentation to characterize the chemical and physical properties of minerals and (3) the applications that derived from these studies. In clastic sedimentary rocks, tourmaline was identified as one of the most important heavy minerals and became a means to estimate maturity of the clastic sediment, to determine provenance and to make stratigraphic correlations. The crystallography of tourmaline was more fully understood and the overall structure and general structural formula was known by the 1960-1970's. Applications of tourmaline relied originally on its piezoelectric properties that became increasingly important during the 20 th century. One application, developed after World War I, was the detection and measurement of conventional and atomic explosion pressures based on tourmaline's piezoelectric properties. Tourmaline studies have expanded in breadth and greatly increased in number since 1977, when micro-analytical and crystallographic/spectroscopic instrumentation became widely available. Petrologically, tourmaline has become a valuable petrogenetic indicator mineral in rocks and sediments due to its occurrence in most rock types, its extreme P-T range of stability, from the near surface to the deepest levels of the crust, its capacity to attain a chemical signature during the evolution of the rock in which it is formed, its ability to retain that chemical imprint, and its capability to provide specific information on the time, temperature and fluid history of its host rock. More recent studies have greatly expanded the conceptual framework of its internal structure and have dramatically increased the number of tourmaline species from 4 to 33. The future of tourmaline studies is promising with many new and exciting possibilities that will continue to influence scientific inquiry well into the future.

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Section: Current Trends and Future Possibilitiesmentioning

confidence: 99%

Tourmaline studies through time: contributions to scientific advancements

Henry¹,

Dutrow²

2018

Jour. Geosci.

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“…The smaller the particle of the tourmaline is, the smaller the CeO 2 nanoparticles is. Yu et al 20 tourmaline/TiO 2 nanocomposites were prepared by a typical sol-gel method, which exhibite higher catalystic performance than pure TiO 2 . Tourmaline/TiO 2 catalyst exhibits a higher photocatalysis synergistic effect due to the spontaneous polarization of the internal dipole field of the tourmaline and the spatially changed energy level of the band, which reduces the potential barrier for photoelectrons or holes to easily migrate to the surface.…”

Section: Introductionmentioning

confidence: 99%

“…The smaller the particle of the tourmaline is, the smaller the CeO 2 nanoparticles is. Yu et al 20 . tourmaline/TiO 2 nanocomposites were prepared by a typical sol‐gel method, which exhibite higher catalystic performance than pure TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The structural formula is NaR 3 Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH, F) 4 , where R = Mg, Fe, Li, or Mn, the crystal structure belongs to the trigonal crystal system 16–18 . Tourmaline surface can form an electrical field of 10 7 V/cm 3 due to the permanent spontaneous polarization induced by its special crystal structure, which could promote the increase of nucleation sites, accelerate the speed of crystal nucleation, and refine the crystal grains 19–24 . The existence of the electric field can control the crystal size of the product, improve the overall crystal quality, and increase the output 25,26 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of spontaneous polarization of tourmaline on the grain growth behavior of 3YSZ powder

et al. 2022

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This paper introduces a new method for adjusting the particle size of ZrO 2 powder through the electric field effect of tourmaline. The 3 mol% yttriastabilized ZrO 2 (3YSZ) powder was prepared by using ZrOCl 2 •8H 2 O, YCl 3 •6H 2 O, NaOH, and nano-tourmaline powder as raw materials through direct precipitation. The powder was characterized with thermogravimetric-differential scanning calorimeter, X-ray diffraction, Brunauere-Emmette-Teller, Fourier transform infrared, scanning electron microscope, and transmission electron microscope, and the mechanism of tourmaline in the process of powder preparation was also discussed. Findings demonstrate that the electric field generated by spontaneous polarization of tourmaline can control the size of ZrO 2 crystal grains, improve the dispersibility of the powder, and promote the stability of ZrO 2 in the tetragonal phase. When the electric intensity of tourmaline is 9.02 × 10 6 V/m, and the addition amount is 2.5 vol%, tourmaline/3YSZ powders are mainly tetragonal phase, and the grain size is the smallest, with an average crystallite size of 19 nm. Then the mechanical properties of tourmaline/3YSZ ceramics were tested. Compared with 3YSZ ceramics without tourmaline, the flexural strength and fracture toughness were improved by 39.5% and 35.8%.

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“…Therefore, a strong electric field exists on the surface of a tourmaline granule [8]. The spontaneous electric field of tourmaline could improve the photocatalysis by capturing electrons and inhibiting the recombination of electrons and holes produced by TiO2 [9]. Additionally, considering the inconvenient application of TiO2 powder in indoor air pollution control, herein window screening material is used as a novel support for composite catalyst.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Gaseous Formaldehyde by Polyvinyl Chloride Gauze Immobilized TiO2/Tourmaline Composites

Wang¹,

Liu²,

Qiao³

et al. 2017

dtmse

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TiO2 was prepared by a sol-gel method and composited with tourmaline to improve the photocatalytic activity utilizing the spontaneous electric field of mineral. Then, the TiO2/tourmaline composites were supported onto Polyvinyl chloride (PVC) gauze to provide a convenient application for degradation of indoor formadehyde (HCHO) gas. The composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), automatic surface area and porosity analyzer (BET). The results showed that the grain size of TiO2 decreased after compositing with tourmaline, and the specific surface area of composites is much higher than that of the pure TiO2. The TiO2/tourmaline gauze exhibited excellent photocatalytic activity for the degradation of HCHO (100mg/m 3 ), which was 5 times higher than that of TiO2 gauze. Moreover, the photocatalytic activity of the composite gauze was fully maintained after four photocatalytic cycles. The enhancement of photocatalytic activity was mainly due to the improvement of catalyst surface performances and capture of photoelectrons by electric field of tourmaline.

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Investigating the synergistic effects in tourmaline/TiO2-based heterogeneous photocatalysis: Underlying mechanism insights

Cited by 49 publications

References 34 publications

Tourmaline studies through time: contributions to scientific advancements

Tourmaline studies through time: contributions to scientific advancements

Effect of spontaneous polarization of tourmaline on the grain growth behavior of 3YSZ powder

Photocatalytic Degradation of Gaseous Formaldehyde by Polyvinyl Chloride Gauze Immobilized TiO2/Tourmaline Composites

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