Characterization of BiOX compounds as photocatalysts for the degradation of pharmaceuticals in water

Ahern, John C.; Fairchild, Rebecca; Thomas, Jin Sun; Carr, Jordan; Patterson, Howard H.

doi:10.1016/j.apcatb.2015.04.025

Cited by 94 publications

(35 citation statements)

References 40 publications

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“…Bismuth oxyhalide compounds are not as widely used in industry as TiO 2 . While BiOX compounds are relatively affordable [12]. BiOX compounds can become the preferred option of photocatalytic degradation of water-borne organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

“…BiOX compounds can become the preferred option of photocatalytic degradation of water-borne organic contaminants. This is due largely to the fact bismuth oxyhalide compounds such as BiOI (E g = 1.7 eV) possess narrow bandgaps compared to TiO 2 (E g = 3.2 eV) [12] and therefore can function under lower-energy irradiation including visible light [12,70]. Numerous other groups have also shown BiOX catalysts present high photocatalytic activity under visible light irradiation [71][72][73][74].…”

Section: Introductionmentioning

confidence: 99%

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Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

2018

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Bismuth oxyhalides have recently gained attention for their promise as photocatalysts. Due to their layered structure, these materials present fascinating and highly desirable physicochemical properties including visible light photocatalytic capability and improved charge separation. While bismuth oxyhalides have been rigorously evaluated for the photocatalytic degradation of dyes and many synthesis strategies have been employed to enhance this property, relatively little work has been done to test them against pharmaceuticals and pesticides. These persistent organic pollutants are identified as emerging concerns by the EPA and effective strategies must be developed to combat them. Here, we review recent work directed at characterizing the nature of the interactions between bismuth oxyhalides and persistent organic pollutants using techniques including LC-MS/MS for the determination of photocatalytic degradation intermediates and radical scavenging to determine active species during photocatalytic degradation. The reported investigations indicate that the high activity of bismuth oxyhalides for the breakdown of persistent organic pollutants from water can be largely attributed to the strong oxidizing power of electron holes in the valence band. Unlike conventional catalysts like TiO2, these catalysts can also function in ambient solar conditions. This suggests a much wider potential use for these materials as green catalysts for industrial photocatalytic transformation, particularly in flow chemistry applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

2018

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“…Thus, the bismuth oxyiodide compound (BiOI) has the lowest bandgap and therefore has the greatest potential to harvest a larger portion of the sunlight for photocatalytic reactions. Solutions of this compound have been used for metals oxidation, dye discoloration, and degradation of phenol, pharmaceuticals, and other contaminants, under sunlight or Vis light exposure.…”

Section: Introductionmentioning

confidence: 99%

Polymeric hybrid films with photocatalytic activity under visible light

Zanrosso

Piazza

Lansarin

2018

J of Applied Polymer Sci

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The immobilization of photocatalysts on several kinds of substrates has been widely studied over the past few years, focusing mainly on improving its industrial application. In this work, novel hybrid films were prepared, employing TiO2 P25, commercial ZnO or BiOI, synthetized through hydrothermal method and immobilized on poly(vinylidene fluoride) by the non‐solvent‐induced phase inversion technique. Subsequently, the prepared composites were evaluated by photodegradation of methylene blue (MB) under ultraviolet or visible light. The samples were also characterized by scanning electron microscope, thermo‐gravimetric analysis, attenuated total reflection–Fourier transform infrared spectroscopy, and X‐ray diffractometer analysis to improve comprehension of the composites' photocatalytic behavior. The degradation reaction of the contaminants exhibited pseudo‐first order kinetics in all samples, and achieved better performance when compared to simple photolysis. The recyclability of the hybrid films was also evaluated and proved that polymeric matrix is a promising material for the preparation of composites for photocatalysis applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46367.

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“…•− in solution [5,6]. These radicals can, in turn, enable the destruction of organic pollutants through hydrogen atom abstraction.…”

Section: Introductionmentioning

confidence: 99%

Alkali metal bismuth(III) chloride double salts

Kelly

Nicholas

Ahern

et al. 2016

Journal of Alloys and Compounds

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Evaporative co-crystallization of MCl (M = Na, K, Rb, Cs) with BiOCl in aqueous HCl produces double salts: M x Bi y Cl (x+3y) •zH 2 O. The sodium salt, Na 2 BiCl 5 •5H 2 O (monoclinic P2 1 /c, a = 8.6983(7) Å, b = 21.7779(17) Å, c = 7.1831(6) Å, β= 103.0540(10)°, V = 1325.54(19) Å 3 , Z = 4) is composed of zigzag chains of µ 2-Cl-cis-linked (BiCl 5) n 2nchains. Edge-sharing chains of NaCl n (OH 2) 6−n octahedra (n = 0, 2, 3) are linked through µ 3-Cl to Bi. The potassium salt, K 7 Bi 3 Cl 16 (trigonal R−3c, a = 12.7053(9) Å, b = 12.7053(9) Å, c = 99.794(7) Å, V = 13951(2) Å 3 , Z = 18) contains (Bi 2 Cl 10) 4edge-sharing dimers of octahedra and simple (BiCl 6) 3octahedra. The K + ions are 5-to 8-coordinate and the chlorides are 3-, 4-, or 5-coordinate. The rubidium salt, Rb 3 BiCl 6 •0.5H 2 O (orthorhombic Pnma, a = 12.6778(10) Å, b = 25.326(2) Å, c = 8.1498(7) Å, V = 2616.8(4) Å 3 , Z = 8) contains (BiCl 6) 3octahedra. The Rb + ions are 6-, 8-, and 9-coordinate, and the chlorides are 4-or 5-coordinate. Two cesium salts were formed: Cs 3 BiCl 6 (orthorhombic Pbcm, a = 8.2463(9) Å, b = 12.9980(15) Å, c = 26.481(3) Å, V = 2838.4(6) Å 3 , Z = 8) being comprised of (BiCl 6) 3octahedra, 8-coordinate Cs + , and 3-, 4-, and 5-coordinate Cl −. In Cs 3 Bi 2 Cl 9 (orthorhombic Pnma, a = 18.4615(15) Å, b = 7.5752(6) Å, c = 13.0807(11) Å, V = 1818.87(11) Å 3 , Z = 4) Bi octahedra are linked by µ 2-bridged Cl into edge-sharing Bi 4 squares which form zigzag (Bi 2 Cl 9) n 3nladders. The 12-coordinate Cs + ions bridge the ladders, and the Cl − ions are 5-and 6-coordinate. Four of the double salts are weakly photoluminescent at 78 K, each showing a series of three excitation peaks near 295, 340, and 380 nm and a broad emission near 440 nm.

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Characterization of BiOX compounds as photocatalysts for the degradation of pharmaceuticals in water

Cited by 94 publications

References 40 publications

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

Polymeric hybrid films with photocatalytic activity under visible light

Alkali metal bismuth(III) chloride double salts

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