Three-Phase Mixed Titania Powder Modified by Silver and Silver Chloride with Enhanced Photocatalytic Activity under UV–Visible Light

Zhu, Xiaodong; Xia, Yangwen

doi:10.3390/nano12091599

Cited by 12 publications

(9 citation statements)

References 47 publications

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“…The three strong peaks in the XRD diffraction pattern of Mus appearing at 8.9°, 26.8° and 45.5° correspond to the (002), (006) and (029) crystal planes. The diffraction peaks of PT at 2θ = 25.3°, 37.8° and 48.1° correspond to the (101), (004) and (200) crystal planes of anatase, respectively, which means that TiO 2 is single-phase anatase [ 32 , 34 ]. The diffraction peaks of anatase and Mus appear in the pattern of TM simultaneously, indicating that TiO 2 /Mus composites are formed.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5 b shows the high-resolution spectrum of Ti 2p. The two peaks at 458.0 and 463.5 eV are indexed to Ti 2p 3/2 and Ti 2p 1/2 , indicating that Ti element exists in the form of 4+ [ 32 , 40 , 41 ]. The high-resolution spectrum of O 1s is shown in Figure 5 c. The two peaks at 529.8 and 531.1 eV correspond to lattice oxygen (O 2− ) and surface hydroxyl (OH − ) [ 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

“…Due to the existence of Schottky junctions, electrons in noble metals are prevented from flowing back into TiO 2 , which promotes the separation of photogenerated charges [ 27 , 28 , 29 , 30 ]. Additionally, owing to the surface plasmon resonance effect, noble metal modification can enhance the absorption in the visible light region, advancing the photocatalytic performance [ 31 , 32 , 33 ]. Bamola et al [ 26 ] prepared Au-TiO 2 using an inert gas evaporation method and it was found that Au and TiO 2 formed Schottky junctions which favored the separation of photogenerated electrons and holes, inhibiting the recombination of carriers.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

et al. 2023

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Ag/TiO2/muscovite (ATM) composites were prepared by the sol–gel method and the effects of Ag modification on the structure and photocatalytic performance were investigated. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller surface area (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FTIR), photoluminescence spectra (PL) and ultraviolet–visible diffuse reflectance spectra (DRS). The photocatalytic activity of the obtained composites was evaluated by taking 100 mL (10 mg/L) of Rhodamine B (RhB) aqueous solution as the target pollutant. The muscovite (Mus) loading releases the agglomeration of TiO2 particles and the specific surface area increases from 17.6 m2/g (pure TiO2) to 39.5 m2/g (TiO2/Mus). The first-order reaction rate constant increases from 0.0009 min−1 (pure TiO2) to 0.0074 min−1 (150%TiO2/Mus). Ag element exists in elemental silver. The specific surface area of 1-ATM further increases to 66.5 m2/g. Ag modification promotes the separation of photogenerated electrons and holes and increases the visible light absorption. 1%Ag-TiO2/Mus (1-ATM) exhibits the highest photocatalytic activity. After 100 min, the rhodamine B (RhB) degradation degrees of PT, 150%TiO2/Mus and 1-ATM are 10.4%, 48.6% and 90.6%, respectively. The first-order reaction rate constant of 1-ATM reaches 0.0225 min−1, which is 25 times higher than that of pure TiO2.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

et al. 2023

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“…Metal oxide nanomaterials have attracted extensive attention in the field of catalysis. [119,120] Their photogenerated electron-hole pairs can transit to the surface and reduce/oxide the adsorbed substance, respectively. [121][122][123] Pt has been introduced into the TiO 2 nanotube to enhance the indirect electrical transfer between the NMs and the metal oxide.…”

Section: Nm-metal Oxide Nanocompositesmentioning

confidence: 99%

Detection of Glucose Based on Noble Metal Nanozymes: Mechanism, Activity Regulation, and Enantioselective Recognition

Chen

Liu

Zheng

et al. 2022

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Glucose monitoring is essential to evaluate the degree of glucose metabolism disorders. The enzymatic determination has been the most widely used method in glucose detection because of its high efficiency, accuracy, and sensitivity. Noble metal nanomaterials (NMs, i.e., Au, Ag, Pt, and Pd), inheriting their excellent electronic, optical, and enzyme‐like properties, are classified as noble metal nanozymes (NMNZs). As the NMNZs are often involved in two series of reactions, the oxidation of glucose and the chromogenic reaction of peroxide, here the chemical mechanism by employing NMNZs with glucose oxidase (GOx) and peroxidase (POD) mimicking activities is briefly summarized first. Subsequently, the regulation strategies of the GOx‐like, POD‐like and tandem enzyme‐like activities of NMNZs are presented in detail, including the materials, size, morphology, composition, and the reaction condition of the representative NMs. In addition, in order to further mimic the enantioselectivity of enzyme, the design of NMNZs with enantioselective recognition of d‐glucose and l‐glucose by using different chiral compounds (DNA, amino acids, and cyclodextrins) and molecular imprinting is further described in this review. Finally, the feasible solutions to the existing challenges and a vision for future development possibilities are discussed.

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“…Among them, the effect of crystalline forms on the photocatalytic activity of TiO 2 is particularly important [ 24 ]. It is well known that TiO 2 exists in three crystalline forms, anatase, rutile and brookite [ 25 ]. Brookite is rarely used in the photocatalytic applications due to its instability [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

et al. 2022

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Degradation of organic pollutants, especially organic dyes and antibiotics, by semiconductor photocatalysts is an efficient strategy for wastewater treatment. TiO2 nanomaterials are considered to be promising photocatalysts due to their high chemical stability, high efficiency and availability. Anatase TiO2 generally has superior photocatalytic activity to the rutile phase. However, the anatase phase can be irreversibly transformed to rutile phase when calcined at an elevated temperature. Methods to improve the stability of anatase are especially important for the TiO2 gas sensors working at high temperatures. The addition of strong acids can effectively suppress this transformation process. However, these strong acids are relatively expensive, corrosive and environmentally unfriendly. Herein, oxalic acid (OA) as a natural acid was used to control the hydrolysis process of tetrabutyl titanate (TBOT), leading to controllable crystalline phase transformation and reduced crystalline size of TiO2 on the nanoscale. What is more, the photocatalytic degradation performances were enhanced continuously when the molar ratio of OA to TBOT increased. The degradation reaction rate constants of CT650-R25 were about 10 times that of CT650-R0. The mechanism study shows that the enhanced photocatalytic activity can be attributed to the improved dispersibility, increased specific surface area and reduced recombination rates of photo-induced charge carriers and decreased energy bands as the concentration of OA increased. Thus, this work provides a simple, mild and effective method for controlling the crystalline forms of nano-TiO2 with enhanced photocatalytic performance towards waste water treatment.

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Three-Phase Mixed Titania Powder Modified by Silver and Silver Chloride with Enhanced Photocatalytic Activity under UV–Visible Light

Cited by 12 publications

References 47 publications

Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

Detection of Glucose Based on Noble Metal Nanozymes: Mechanism, Activity Regulation, and Enantioselective Recognition

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

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