Evaluation of adsorption ability of cyclodextrin-calixarene nanosponges towards Pb2+ ion in aqueous solution

Cataldo, Salvatore; Meo, Paolo Lo; Conte, Pellegrino; Vincenzo, Antonella Di; Milea, Demetrio; Pettignano, Alberto

doi:10.1016/j.carbpol.2021.118151

Cited by 27 publications

(12 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although many papers have reported some effective porous materials for adsorption of Pb 2+ , the preparation of porous materials is often carried out under some harsh conditions such as high-temperature [ 15 ], tedious, and toxic chemical reactions [ 16 , 17 ]. For the purpose of improving the adsorption properties, mechanical strength, and easy separation of adsorbents from wastewater, we focused on a green synthesis of microsphere based on pectin and activated carbon, in which the composite may further benefit from the synergistic effects.…”

Section: Introductionmentioning

confidence: 99%

Pectin/Activated Carbon-Based Porous Microsphere for Pb2+ Adsorption: Characterization and Adsorption Behaviour

Wang

Shuai

et al. 2021

Polymers

View full text Add to dashboard Cite

The development of effective heavy metal adsorbents has always been the goal of environmentalists. Pectin/activated carbon microspheres (P/ACs) were prepared through simple gelation without chemical crosslinking and utilized for adsorption of Pb2+. Scanning electron microscopy (SEM) revealed that the addition of activated carbon increased the porosity of the microsphere. Texture profile analysis showed good mechanical strength of P/ACs compared with original pectin microspheres. Kinetic studies found that the adsorption process followed a pseudo-second-order model, and the adsorption rate was controlled by film diffusion. Adsorption isotherms were described well by a Langmuir isotherm model, and the maximum adsorption capacity was estimated to be 279.33 mg/g. The P/ACs with the highest activated carbon (P/AC2:3) maintained a removal rate over 95.5% after 10 adsorption/desorption cycles. SEM-energy-dispersive X-ray spectrum and XPS analysis suggested a potential mechanism of adsorption are ion exchange between Pb2+ and Ca2+, electronic adsorption, formation of complexes, and physical adsorption of P/ACs. All the above results indicated the P/ACs may be a good candidate for the adsorption of Pb2+.

show abstract

Section: Introductionmentioning

confidence: 99%

Pectin/Activated Carbon-Based Porous Microsphere for Pb2+ Adsorption: Characterization and Adsorption Behaviour

Wang

Shuai

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…Another type of pH-responsive NS was obtained by co-polymerization between CD and calixarene derivatives, covalently linked by triazole units (CyCaNSs). CyCaNSs are useful in environmental remediation ( Cataldo et al, 2021 ) and in drug delivery, as the triazole acts actively as antibacterial, antifungal, antitumor and cytotoxic agent ( Lo Meo et al, 2014 ; Pawar et al, 2019 ).…”

Section: Applicationsmentioning

confidence: 99%

Cyclodextrin-Based Nanosponges: Overview and Opportunities

et al. 2022

View full text Add to dashboard Cite

Nanosponges are solid cross-linked polymeric nano-sized porous structures. This broad concept involves, among others, metal organic frameworks and hydrogels. The focus of this manuscript is on cyclodextrin-based nanosponges. Cyclodextrins are cyclic oligomers of glucose derived from starch. The combined external hydrophilicity with the internal hydrophobic surface constitute a unique “microenvironment”, that confers cyclodextrins the peculiar ability to form inclusion host‒guest complexes with many hydrophobic substances. These complexes may impart beneficial modifications of the properties of guest molecules such as solubility enhancement and stabilization of labile guests. These properties complemented with the possibility of using different crosslinkers and high polymeric surface, make these sponges highly suitable for a large range of applications. Despite that, in the last 2 decades, cyclodextrin-based nanosponges have been developed for pharmaceutical and biomedical applications, taking advantage of the nontoxicity of cyclodextrins towards humans. This paper provides a critical and timely compilation of the contributions involving cyclodextrins nanosponges for those areas, but also paves the way for other important applications, including water and soil remediation and catalysis.

show abstract

“…Cyclodextrins are supposed to be one of the best drug delivery agents owing to these reasons. [26][27][28] Calixarenes are yet another class of supramolecular assemblies broadly used for molecular recognition and encapsulation. They may be easily functionalized at various sites leading to enhanced selectivity and better binding with a variety of guests.…”

Section: Introductionmentioning

confidence: 99%

“…Cyclodextrins attain a truncated conical geometry and are equipped with hydroxyl groups at each terminal which facilitates the recognition and encapsulation of molecules through noncovalent interactions. Cyclodextrins are supposed to be one of the best drug delivery agents owing to these reasons 26–28 . Calixarenes are yet another class of supramolecular assemblies broadly used for molecular recognition and encapsulation.…”

Section: Introductionmentioning

confidence: 99%

Binding propensity and selectivity of cationic, anionic, and neutral guests with model hydrophobic hosts: A first principles study

et al. 2022

View full text Add to dashboard Cite

Computations play a critical role in deciphering the nature of host–guest interactions both at qualitative and quantitative levels. Reliable quantum chemical computations were employed to assess the nature, binding strength, and selectivity of ionic, and neutral guests with benzenoid hosts. Optimized complex structures reveal that alkali and ammonium ions are found to be in the hydrophobic cavity, while halide ions are outside, while both complexes elicit substantial binding energy. The origin of the selectivity of host toward the guest has been traced to the interaction and deformation energies, and the nature of associated interactions is quantified using energy decomposition and the Quantum Theory of Atoms in Molecules analyses. While the larger hosts lead to loosely bound complexes, as assessed by the longer intermolecular distances, the binding strengths are proportional to the size of the host systems. The binding of cationic complexes is electrostatic or polarization driven while exchange term dominates the anionic complexes. In contrast, dispersion contribution is a key in neutral complexes and plays a pivotal role in stabilizing the polyatomic complexes.

show abstract

Evaluation of adsorption ability of cyclodextrin-calixarene nanosponges towards Pb2+ ion in aqueous solution

Cited by 27 publications

References 85 publications

Pectin/Activated Carbon-Based Porous Microsphere for Pb2+ Adsorption: Characterization and Adsorption Behaviour

Pectin/Activated Carbon-Based Porous Microsphere for Pb2+ Adsorption: Characterization and Adsorption Behaviour

Cyclodextrin-Based Nanosponges: Overview and Opportunities

Binding propensity and selectivity of cationic, anionic, and neutral guests with model hydrophobic hosts: A first principles study

Contact Info

Product

Resources

About