Fabrication of functionalized plasmonic Ag loaded Bi2O3/montmorillonite nanocomposites for efficient photocatalytic removal of antibiotics and organic dyes

Tun, Phyu Phyu; Wang, Junting; Khaing, Thinn Thinn; Wu, Xiaoyong; Zhang, Gaoke

doi:10.1016/j.jallcom.2019.152836

Cited by 76 publications

(32 citation statements)

References 57 publications

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“…Both isotherms correspond to type IV of the IUPAC classification, indicating the presence of mesoporosity (2−50 nm). 69,70 The hysteresis loops are similar to the type H3, which is usually given by nonrigid aggregates of platelike particles. 71 The values of the specific surface area, average pore diameter, and pore volume of the samples are given in Table 3.…”

Section: ■ Results and Discussionmentioning

confidence: 66%

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

et al. 2020

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The photocatalytic properties of Bi2–x Ti2O7–1.5x (x = 0, 0.5) pyrochlores are examined via ab initio calculations and experiments. A coprecipitation method is applied for the synthesis of nanopowder pyrochlores. The pyrochlore phase formation starts at 500 °C (Bi2Ti2O7) and 550 °C (Bi1.5Ti2O6.25). Nanopowders are found to be a metastable character of pyrochlore phases. The presence of bismuth and oxygen vacancies enhances the thermal stability of the Bi1.5Ti2O6.25 phase in comparison with the Bi2Ti2O7 phase. The estimated crystallite size is 30–40 nm with noticeable agglomerates of about 100–300 nm according to scanning electron microscopy (SEM) and with the formation of particles (510–580 nm) in the aqueous medium. The isoelectric points of the nanopowders seem to be shifted to the strongly acidic region, resulting in the formation of negative surface particle charges of −33 mV (Bi2Ti2O7) and −27 mV (Bi1.5Ti2O6.25) at pH 5.88 in distilled water. The specific surface area is 11.5 m2/g (Bi2Ti2O7) and 12.00 m2/g (Bi1.5Ti2O6.25). The use of the generalized gradient approximation (GGA) with the Perdew–Burke–Ernzerhof (PBE) functional allows achieving an excellent agreement between theoretical and experimental structural parameters. The screened Coulomb hybrid HSE03 functional is the most appropriate for describing the optoelectronic properties. Bismuth titanate pyrochlores are wide-gap semiconductors with strong abilities to be active photocatalysts under visible irradiation. The optical E g values for direct/indirect transition according to the experiment, 3.19/2.94 eV (x = 0) and 3.24/3.03 eV (x = 0.5), and the DFT/HSE03 calculations, 2.92/2.87 (x = 0) and 3.42/– eV (x = 0.5), are in the visible light region and are close. The calculated low effective masses of the charge carriers and suitable band edge positions confirm the ability of the pyrochlores to act as photocatalysts. The photocatalytic activity has been evaluated through the decomposition of rhodamine B under visible irradiation. Bi2Ti2O7 shows the highest activity in comparison with Bi1.5Ti2O6.25, which is in good agreement with theoretically predicted and experimentally revealed characteristics.

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Section: ■ Results and Discussionmentioning

confidence: 66%

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

et al. 2020

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“…Bi 2 O 3 with increased active site, Ag nanoparticles with SPR effect, and montmorillonite (MMT) with high surface area were together used to form Ag-loaded Bi 2 O 3 /montmorillonite, and this nanocomposite can mineralize 90% of TC within 60 min of light irradiation. 30 Coupling of Bi 2 O 3 with g-C 3 N 4 provided efficient core-shell material with 80.2% TC removal. 31 Designing of mesoporous Ag/Bi 2 Sn 2 O 7 -C 3 N 4 has excellent photocatalytic effect on TC owing to its effective charge separation and SPR effect, which can inuence the increased light absorption.…”

Section: Advanced Oxidation Treatment Techniques (Aops)mentioning

confidence: 98%

A review on tetracycline removal from aqueous systems by advanced treatment techniques

et al. 2020

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“…After being dried at room temperature, the CCTCS sponge was obtained. The CCTCS sponge was immersed in palmitic acid/ethanol solution with different concentrations (10,20,40,80, and 100 mmol/L) and under diverse temperatures (30,40,50,60, and 70 °C) for different times (1,4,8,12, and 24 h). The resulting sponge was washed using ethanol several times, and the ACCTCS sponge was obtained after being dried at 40 °C.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…These hydrophobic contaminants may persist for long periods and may be toxic, which endangers the ecological environment and human health . The development of novel absorbents to efficiently remove these organic contaminants from wastewater has therefore received great attention from academia and industry in recent years. − However, traditional absorbents such as graphene, , activated carbon, and montmorillonite do have some limitations, such as poor dispersibility within the water environment, as well as their high recycling costs and/or nonbiodegradable nature . Therefore, it is imperative to develop new types of absorbents that are safe, stable, efficient, biodegradable, and ecologically sustainable.…”

Section: Introductionmentioning

confidence: 99%

Green Preparation of Robust Hydrophobic β-Cyclodextrin/Chitosan Sponges for Efficient Removal of Oil from Water

et al. 2021

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A relatively straightforward green method to fabricate robust hydrophobic sponges for effective removal of oil pollutants and other organic contaminants was developed. These sponges were constructed from bio-sources: citronellal and palmitic acid-modified aminoethyl cyclodextrin-sodium phytate-chitosan (ACCTCS). The modified sponge exhibited desirable mechanical properties and strong hydrophobicity with a water contact angle (WCA) of 147.8°. Scanning electron microscopy showed that the ACCTCS sponge had a highly porous structure that was particularly suitable for organic component absorption. The sponge exhibited excellent absorption capacities for n-hexane, trichloromethane, vacuum pump oil, and peanut oil (47.9, 32.3, 32.6, and 32.2 g/g, respectively). The removal rate of oil was more than 80% (>26.2 g/g) after 10 absorption–desorption cycles. The ACCTCS sponge also showed good oil/water and organic components/water separation performance. The bio-source materials, green preparation method, and new absorbed-oil recovery strategy provided a novel pathway to construct multifunctional absorbents for oil/water separation in industrial wastewater.

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Fabrication of functionalized plasmonic Ag loaded Bi2O3/montmorillonite nanocomposites for efficient photocatalytic removal of antibiotics and organic dyes

Cited by 76 publications

References 57 publications

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

A review on tetracycline removal from aqueous systems by advanced treatment techniques

Green Preparation of Robust Hydrophobic β-Cyclodextrin/Chitosan Sponges for Efficient Removal of Oil from Water

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Fabrication of functionalized plasmonic Ag loaded Bi2O3/montmorillonite nanocomposites for efficient photocatalytic removal of antibiotics and organic dyes

Cited by 76 publications

References 57 publications

Photocatalytic Properties of Bi2–xTi2O7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi2–xTi2O7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

A review on tetracycline removal from aqueous systems by advanced treatment techniques

Green Preparation of Robust Hydrophobic β-Cyclodextrin/Chitosan Sponges for Efficient Removal of Oil from Water

Contact Info

Product

Resources

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Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study