ZIF-8 Derived Hollow Carbon for Efficient Adsorption of Antibiotics

Hong-mei, Tang; Li, Wenyao; Jiang, Haiyong; Lin, Runjia; Wang, Zhe; Wu, Jianghong; He, Guanjie; Shearing, Paul R.; Brett, Dan J. L.

doi:10.20944/preprints201812.0328.v1

Cited by 5 publications

(11 citation statements)

References 10 publications

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“…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%

“…Additionally, this macromolecule has been considered ecofriendly, nontoxic and biodegradable [ 19 , 20 , 21 ]. However, chitosan water solubility is limited by acid medium, herein, some studies evidence the better chemical stability of chitosan being related to crosslinking reactions, using both amino and hydroxyl-based crosslinking agents such as epichlorohydrin [ 22 ], glutaraldehyde [ 23 ] and tripolyphosphate [ 11 ].…”

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…To understand the CV adsorption mechanism at molecular level, a set of advanced statistical models ( Table 2 ) was used to fit the CV adsorption results [ 4 , 10 , 13 ]. The best statistical physics model for CV adsorption onto MNP/CTAB‒EC composite was recognized depending on the calculated

and the root mean square error (RMSE) calculated as follows [ 2 , 13 ]:

where

denotes the experimental data and

is the number of adjustable parameters.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, its sufficient binding to the sorbent should be ensured to avoid its release during the adsorption process. For instance, CTAB-assisted synthesis of ZIF-8 was applied as template to prepare ZIF-8–derived hollow carbon nanostructures as an adsorbent for antibiotics [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

et al. 2020

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Surfactant–modified exfoliated Fayum clay (CTAB–EC) obtained after chemical treatment with a CTAB/H2O2 solution was further decorated with magnetic Fe3O4 nanoparticles (MNP). The final nanocomposite (MNP/CTAB–EC) was characterized by XRD, SEM, FTIR, TEM and its adsorptive capability against a model cationic dye, crystal violet (CV), was evaluated. A comparison of the adsorption performance of the raw clay and its modified counterparts using H2O2, CTAB, CTAB/H2O2 or MNP indicated that the adsorption capacity of MNP/CTAB–EC was the highest for CV removal at pH 8.0. The pseudo‒second order for the kinetics and Freundlich model for adsorption equilibrium fitted well the CV removal experimental data at all tested temperatures (25, 40 and 55 °C). The enhancement of the Langmuir adsorption capacity from 447.1 to 499.4 mg g−1 with increasing the temperature from 25 to 55 °C revealed an endothermic nature of the removal process. The interactions between CV and MNP/CTAB–EC were interpreted using advanced statistical physics models (ASPM) in order to elucidate the adsorption mechanism. Multilayer model fitted the adsorption process and therefore, the steric and energetic factors that impacted the CV adsorption were also interpreted using this model. The aggregated number of CV molecules per MNP/CTAB–EC active site ( n ) was more than unity at all temperatures, representing thus a vertical adsorption orientation and a multi‒interactions mechanism. It was determined that the increase of CV uptake with temperature was mainly controlled by the increase of the number of active sites (NM). Calculated adsorption energies (ΔE) revealed that CV removal was an endothermic and a physisorption process (ΔE < 40 kJ mol −1). MNP/CTAB–EC was magnetically separated, regenerated by NaOH, and reused without significant decrease in its adsorption efficiency, supporting a prosperity of its utilization as an effective adsorbent against hazardous dyes from wastewaters.

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“…In essence, the fast adsorption/desorption of electrolyte ions or rapid reversible oxidation–reduction reaction in SCs requires electrode materials to present short charge/ions transfer channel and abundant active (adsorption/desorption and redox) sites. MOFs [ 11 , 12 , 13 ] and their derived materials (carbon, metal oxides/sulfides, etc.) with inheriting MOFs pore structure, can provide adequate adsorption/reactive sites due to their large specific surface area and adjustable porous structure; in addition, their wide varieties and promising electrochemical activity make them suitable for SC electrode materials [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

The Application of Metal–Organic Frameworks and Their Derivatives for Supercapacitors

et al. 2020

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Supercapacitors (SCs), one of the most popular types of energy-storage devices, present lots of advantages, such as large power density and fast charge/discharge capability. Being the promising SCs electrode materials, metal–organic frameworks (MOFs) and their derivatives have gained ever-increasing attention due to their large specific surface area, controllable porous structure and rich diversity. Herein, the recent development of MOFs-based materials and their application in SCs as the electrode are reviewed and summarized. The preparation method, the morphology of the materials and the electrical performance of various MOFs and their derivatives (such as carbon, metal oxide/hydroxide and metal sulfide) are briefly discussed. Most of recent works concentrate on Ni-, Co- and Mn-MOFs and their composites/derivatives. Conclusions and our outlook for the researches are also given, which would be a valuable guideline for the rational design of MOFs materials for SCs in the near future.

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ZIF-8 Derived Hollow Carbon for Efficient Adsorption of Antibiotics

Cited by 5 publications

References 10 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

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

The Application of Metal–Organic Frameworks and Their Derivatives for Supercapacitors

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