Core–shell TiO<sub>2</sub>@C ultralong nanotubes with enhanced adsorption of antibiotics

Wang, Zhe; Hong-mei, Tang; Li, Wenyao; Li, Jianwei; Xu, Ruoyu; Zhang, Kenan; He, Guanjie; Shearing, Paul R.; Brett, Dan J. L.

doi:10.1039/c9ta06735c

Cited by 56 publications

(22 citation statements)

References 34 publications

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“…The initial rate of intraparticle diffusion model is obtained by the Equation (4):

where

is the intraparticle rate (g·mg −1 ·min −5 ) and C is a constant. In general, the intraparticle plots should show three regions assigned to: (i) instantaneous adsorption, which is influenced by external mass transfer of the adsorbent; (ii) internal diffusion and (iii) equilibrium condition [ 10 ].…”

Section: Methodsmentioning

confidence: 99%

“…Instead, when β → 0, isotherm tends to Freundlich model at high concentration [39]. The Temkin isotherm model considers adsorbent-adsorbate interactions, assuming that the heat of adsorption in the layer decreases linearly with coverage, in which can occur with a uniform binding energy distribution up to some maximum binding energy [40], as described by Equations ( 9) and (10).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Herein, considering the excessive dyes use, numerous dye-removal methods have been developed such as adsorption [ 5 ], heterogeneous Fenton process [ 6 ], photocatalytic degradation [ 7 ], coagulation–flocculation [ 8 ] and ultra-filtration through fine membranes [ 9 ]. Currently, adsorption method has been widely applied to remove different types of pollutants from effluents, due to their low cost and simplicity of design [ 10 , 11 ]. However, most textile industries have been used activated carbon as adsorbent, even presenting high cost, once can remove heavy metals and dyes with high adsorption capacity [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

et al. 2020

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In this work, chitosan/magnetite nanoparticles (ChM) were quickly synthesized according to our previous report based on co-precipitation reaction under ultrasound (US) irradiation. Besides ChM was in-depth structurally characterized, showing a crystalline phase corresponding to magnetite and presenting a spheric morphology, a “nanorod”-type morphology was also obtained after increasing reaction time for eight minutes. Successfully, both morphologies presented a nanoscale range with an average particle size of approximately 5–30 nm, providing a superparamagnetic behavior with saturation magnetization ranging from 44 to 57 emu·g−1. As ChM nanocomposites have shown great versatility considering their properties, we proposed a comparative study using three different amine-based nanoparticles, non-surface-modified and surface-modified, for removal of azo dyes from aqueous solutions. From nitrogen adsorption–desorption isotherm results, the surface-modified ChMs increased the specific surface area and pore size. Additionally, the adsorption of anionic azo dyes (reactive black 5 (RB5) and methyl orange (MO)) on nanocomposites surface was pH-dependent, where surface-modified samples presented a better response under pH 4 and non-modified one under pH 8. Indeed, adsorption capacity results also showed different adsorption mechanisms, molecular size effect and electrostatic attraction, for unmodified and modified ChMs, respectively. Herein, considering all results and nanocomposite-type structure, ChM nanoparticles seem to be a suitable potential alternative for conventional anionic dyes adsorbents, as well as both primary materials source, chitosan and magnetite, are costless and easily supplied.

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“…The initial rate of intraparticle diffusion model is obtained by the Equation (4):

where

Section: Methodsmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

et al. 2020

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“…There are many kinetic models used to describe the adsorption kinetic properties on solid adsorbents currently. Among these models, pseudo-first order and pseudo-second order kinetic models have been widely used to represent the gas-solid adsorption process [25][26][27]. Among them, the pseudo-first order kinetic model, as shown in Equation 8, mainly studies the adsorption process controlled by surface diffusion.…”

Section: Kinetic Modelsmentioning

confidence: 99%

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

et al. 2020

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In this paper, a silica aerogel support was prepared by two-step sol–gel method, and the active component K2CO3 was supported on the support by wet loading to obtain a modified potassium-based CO2 adsorbent. As the influences of reaction conditions on the CO2 capture characteristics of modified potassium-based adsorbents, the reaction temperature (50 °C, 60 °C, 70 °C, 80 °C), water vapor concentration (10%, 15%, 20%), CO2 concentration (5%, 10%, 12.5%, 15%), and total gas flow rate (400 mL/min, 500 mL/min, 600 mL/min) were studied in a self-designed fixed-bed reactor. At the same time, the low-temperature nitrogen adsorption experiment, scanning electron microscope, and X-ray diffractometer were used to study the microscopic characteristics of modified potassium-based adsorbents before and after the reaction. The results show that the silica aerogel prepared by the two-step sol–gel method has an excellent microstructure, and its specific surface area and specific pore volume are as high as 838.9 m2/g and 0.85 cm3/g, respectively. The microstructure of K2CO3 loaded on the support is improved, which promotes the CO2 adsorption performance of potassium-based adsorbents. The adsorption of CO2 by potassium-based adsorbents can be better described by the Avrami fractional kinetic model and the modified Avrami fractional kinetic model, and it is a complex multi-path adsorption process, which is related to the adsorption site and activity. The optimal adsorption temperature, water vapor concentration, CO2 concentration, and total gas volume were 60 °C, 15%, 12.5%, and 500 mL/min, respectively.

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“…The slight difference in kinetic diameter between CO 2 (0.33 nm) and CO (0.37 nm) makes kinetic separations so challenging for large scale [16]. For the adsorption equilibrium separation of CO 2 /CO mixtures, the adsorption capacity is related to the specific surface area and structures of the adsorbents [17], thus the adsorbent–adsorbent interaction plays a critical role in the separation performance. Factors that affect the adsorbent–adsorbate interaction are complex [18].…”

Section: Introductionmentioning

confidence: 99%

Carbon monoxide and carbon dioxide adsorption on alkali metal cation‐exchanged SSZ‐13 zeolites

Feng

Bao

et al. 2020

Micro & Nano Letters

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In this work, chabazite SSZ-13 samples with different cations were synthesised by hydrothermal method and thoroughly analysed using various characterisation techniques. The role of types of cations in CO 2 and CO adsorption measurements was investigated. The adsorption isotherms were fitted by Langmuir, Langmuir-Freundlich and Toth adsorption models, respectively. The result shows that the Langmuir-Freundlich model is the most suitable for the adsorption isotherms of SSZ-13 molecular sieves. The adsorption isotherms of the fitted CO 2 and CO were analysed to study the high silicon SSZ-13 samples of alkali metal cations Li + , Na + , K + and Cs + for ion exchange. The result shows that Na + has the highest adsorption capacity, but the adsorption selectivity is extremely low. K + has the lowest adsorption capacity, but it has excellent adsorption selectivity, which may be attributed to its large cation radius and the special position of cations in CHA skeleton structure, resulting in the formation of 'molecular trapdoor' effect. In addition, Cs + has a larger ionic radius than K + , but the adsorption selectivity is not significantly improved, similar to Li +. It can be determined that the 'molecular trapdoor' effect has a significant relationship with the position of cations in the framework.

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Core–shell TiO₂@C ultralong nanotubes with enhanced adsorption of antibiotics

Abstract: As materials capable of adsorbing antibiotics continue to be developed, composite adsorbents have been shown to offer advantages over mono-material adsorbents.

Cited by 56 publications

References 34 publications

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

Carbon monoxide and carbon dioxide adsorption on alkali metal cation‐exchanged SSZ‐13 zeolites

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Core–shell TiO2@C ultralong nanotubes with enhanced adsorption of antibiotics

Abstract: As materials capable of adsorbing antibiotics continue to be developed, composite adsorbents have been shown to offer advantages over mono-material adsorbents.

Cited by 56 publications

References 34 publications

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

Carbon monoxide and carbon dioxide adsorption on alkali metal cation‐exchanged SSZ‐13 zeolites

Contact Info

Product

Resources

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Core–shell TiO₂@C ultralong nanotubes with enhanced adsorption of antibiotics