TiO2 crystal facet-dependent antimony adsorption and photocatalytic oxidation

Song, Jiaying; Li, Yan; Duan, Jinming; Jing, Chuanyong

doi:10.1016/j.jcis.2017.02.054

Cited by 39 publications

(15 citation statements)

References 47 publications

(57 reference statements)

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“…It is reasonable to surmise that a certain amount of Sb(III) was converted to Sb(V) while passing through the TiO 2 −CNT filter upon the application of an external voltage. It has been reported that TiO 2 is capable to oxidize As(III) to As(V) 34 and Sb(III) to Sb(V) 25 by production of reactive oxygen species (ROS) upon illumina- . 11 This also contributes to the stabilization of adsorbed Sb species and suppresses desorption, leading to increased sorption kinetics for Sb(III) and Sb(V).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Therefore, preoxidation of Sb(III) to Sb(V) is a feasible option in practical conditions . Some chemical oxidants, such as MnO 2 and OH• are capable of transforming Sb(III) to Sb(V). , However, high costs of chemical consumption and subsequent deterioration of water quality due to high reagent usage seem inevitable. Therefore, recent efforts have been devoted to developing novel adsorptive systems that combine adsorption and oxidation for effective Sb(III) removal.…”

Section: Introductionmentioning

confidence: 99%

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Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Liu

et al. 2019

Environ. Sci. Technol.

117

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Herein, we rationally designed a dual-functional electroactive filter system for simultaneous detoxification and sequestration of Sb(III). Binder-free and nanoscale TiO2-modified carbon nanotube (CNT) filters were fabricated. Upon application of an external electrical field, in situ transformation of Sb(III) to less toxic Sb(V) can be achieved, which is further sequestered by TiO2. Sb(III) removal kinetics and capacity increase with applied voltage and flow rate. This can be explained by the synergistic effects of the filter’s flow-through design, electrochemical reactivity, small pore size, and increased number of exposed sorption sites. STEM characterization confirms that Sb were mainly sequestered by TiO2. XPS, AFS, and XAFS results verify that the Sb(III) conversion process was accelerated by the electrical field. The proposed electroactive filter technology works effectively across a wide pH range. The presence of sulfate, chloride, and carbonate ions negligibly inhibited Sb(III) removal. Exhausted TiO2–CNT filters can be effectively regenerated using NaOH solution. At 2 V, 100 μg/L Sb(III)-spiked tap water generated ∼1600 bed volumes of effluent with >90% efficiency. Density functional theory calculations suggest that the adsorption energy of Sb(III) onto TiO2 increases (from −3.81 eV to −4.18 eV) and Sb(III) becomes more positively charged upon application of an electrical field.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Liu

et al. 2019

Environ. Sci. Technol.

117

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“…Because of its photocatalytic capabilities, anatase TiO 2 has been studied for sorption and photooxidation/photoreduction of inorganic contaminants, including arsenic, antimony, and uranium. − For all of these studies, the sorption of the target metal was highest on the {001} facet, leading to enhanced photodegradation behavior. Notably, however, HF acid was used during the synthesis of the {001}-faceted TiO 2 and, as discussed previously, this likely enhanced the reactivity of the particles.…”

Section: Applicationsmentioning

confidence: 99%

Toward Informed Design of Nanomaterials: A Mechanistic Analysis of Structure–Property–Function Relationships for Faceted Nanoscale Metal Oxides

et al. 2020

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Nanoscale metal oxides (NMOs) have found wide-scale applicability in a variety of environmental fields, particularly catalysis, gas sensing, and sorption. Facet engineering, or controlled exposure of a particular crystal plane, has been established as an advantageous approach to enabling enhanced functionality of NMOs. However, the underlying mechanisms that give rise to this improved performance are often not systematically examined, leading to an insufficient understanding of NMO facet reactivity. This critical review details the unique electronic and structural characteristics of commonly studied NMO facets and further correlates these characteristics to the principal mechanisms that govern performance in various catalytic, gas sensing, and contaminant removal applications. General trends of facet-dependent behavior are established for each of the NMO compositions, and selected case studies for extensions of facet-dependent behavior, such as mixed metals, mixed-metal oxides, and mixed facets, are discussed. Key conclusions about facet reactivity, confounding variables that tend to obfuscate them, and opportunities to deepen structure−property−function understanding are detailed to encourage rational, informed design of NMOs for the intended application.

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“…Where the {103}f is the faceted configuration, the {103}s is the smooth configuration, the {112}b is the bulk‐truncated {112} surface, the {112}r is the reconstructed {112} surface. These values are taken from the following references: {001}, {010}, {101}, {103}f, and {103}s from refs., {110} from refs., {112}b and {112}r from ref., {116} from ref., {201} from ref., {211} from ref …”

Section: Fundamental Backgroundmentioning

confidence: 99%

Modulating High‐Index Facets on Anatase TiO₂

Zhou

Ding

et al. 2018

Eur J Inorg Chem

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The atomic arrangement of titanium and oxygen on crystalline anatase TiO 2 formulates various facets, dominating the TiO 2 surface chemistry. Due to its unique surface atomic structure, TiO 2 with high-index facets has received great interest from a wide spectrum of science. Insights gained from the intricate link between the morphological modulation of anatase TiO 2 with distinct high-index facets and the properties of these modifications can expedite the rational fabrication of functional Fundamental BackgroundTitanium dioxide (TiO 2 ) has attracted considerable attention ever since the pioneer study by Fujishima and Honda in the 1970s.[1] TiO 2 materials have wide-ranged applications in photocatalysis, photoelectrochemical cells, rechargeable lithium ion batteries, sensors, and dye-sensitized solar cells. [2][3][4][5][6][7][8][9] All these applications are rooted in the distinctive physicochemical properties of these materials, [10][11][12] which are mainly influenced by the specific facets of the TiO 2 crystals. [13][14][15][16][17][18][19][20] Recently, high-index TiO 2 has been reported to exhibit unique properties with an advantage over low-index TiO 2 . The high-index facets are defined as a series of Miller indices {hkl} with at least one index being greater than one. [21] Nano-or microcrystals with exposed high-index facets are of paramount significance to both fundamental research and technical applications by virtue of their copious atomic steps, kinks, ledges, dangling bonds, and abundant unsaturated coordination sites. [5,14,[22][23][24][25][26][27][28] For instance, we observed that high-index {201} TiO 2 exhibited better adsorption and photooxidation performance than that of three low-index {001}, {100}, and {101} TiO 2 materials. [13] This observation is ascribed to the surface energy, which follows the order {201} (1.72 J/m 2 ) > {001} (0.90 J/m 2 ) > {010} (0.53 J/m 2 ) > {101} (0.44 J/m 2 ). [13,[29][30][31] {201} facets have more uncoordinated Ti atoms, facilitating the photogeneration of hydroxyl radicals. The surface energy and atomic structure of [a] 688 comprised spindles with stepped terraces at 1 h. The TEM images at 6 h (Figure 7c, d) reveal that the particle size increased with extending reaction time. It is noteworthy that the SAED and HRTEM images (Figure 7e, f ) further confirm that the TiO 2 nanorods were composed of {010}, {001}, {101}, and {103} facets. An extraordinary power conversion efficiency was observed for DSSCs assembled of these unique microstructures.

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TiO2 crystal facet-dependent antimony adsorption and photocatalytic oxidation

Cited by 39 publications

References 47 publications

Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Toward Informed Design of Nanomaterials: A Mechanistic Analysis of Structure–Property–Function Relationships for Faceted Nanoscale Metal Oxides

Modulating High‐Index Facets on Anatase TiO₂

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TiO2 crystal facet-dependent antimony adsorption and photocatalytic oxidation

Cited by 39 publications

References 47 publications

Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Electroactive Modified Carbon Nanotube Filter for Simultaneous Detoxification and Sequestration of Sb(III)

Toward Informed Design of Nanomaterials: A Mechanistic Analysis of Structure–Property–Function Relationships for Faceted Nanoscale Metal Oxides

Modulating High‐Index Facets on Anatase TiO2

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About

Modulating High‐Index Facets on Anatase TiO₂