Preparation of natural zeolitic supports for potential biomedical applications

Farías, Tania; Ruiz‐Salvador, A. Rabdel; Velazco, Lya; Menorval, L. C. De; Rivera, A.

doi:10.1016/j.matchemphys.2009.07.054

Cited by 20 publications

(18 citation statements)

References 30 publications

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“…Such increase probably arises from the liberation of supplementary space on the samples by the dealumination process and the ion exchange by H 3 O + . These results are in good agreement with those reported for acid forms of different natural clinoptilolites [2,12,13,19,37]. In addition, the order of the characteristic energy (E 01 ) was AZH-1 % NZ > AZ, while the order of the product E 01 Â W 01 was AZH-1 > NZ ) AZ.…”

Section: Nitrogen Adsorptionsupporting

confidence: 91%

“…Clinoptilolite zeolites dealuminated via acid treatment were investigated in order to prepare efficient catalyst, molecular sieves, and adsorbents [4,5,17,18]. Recently, acid forms of Cuban natural clinoptilolite (NZ) were prepared by two different methods in order to obtain Li-enriched forms for their potential use as ions release matrix [19]. The authors observed the decrease in the amount of native cations and the dealumination of the framework, without alteration of the NZ structure.…”

Section: Introductionmentioning

confidence: 99%

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Acid natural clinoptilolite: Structural properties against adsorption/separation of n-paraffins

Rivera

Farías

Menorval

et al. 2011

Journal of Colloid and Interface Science

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Section: Nitrogen Adsorptionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Acid natural clinoptilolite: Structural properties against adsorption/separation of n-paraffins

Rivera

Farías

Menorval

et al. 2011

Journal of Colloid and Interface Science

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“…However, Si/Al ratios of SnO 2 -containing samples increased with respect to raw CLI. This can be ascribed to the partial dealumination process during the conversion of CLI to H-CLI [27,28]. This was also confirmed by the constant Si/Al ratios (~7.3) at higher Sn loadings.…”

Section: Sno2cli05mentioning

confidence: 52%

SnO2-Containing Clinoptilolite as a Composite Photocatalyst for Dyes Removal from Wastewater under Solar Light

et al. 2020

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Due to their adsorbent, ion exchange and catalytic properties zeolites are suitable for a variety of applications. We report on the photocatalytic activity of a readily available and inexpensive natural zeolite clinoptilolite (Z) containing SnO2 (Sn-Z). The Sn-Z samples with 3–15 wt. % of Sn were prepared by using a precipitation–deposition method. Powder X-ray diffraction analysis showed that the zeolite structure was unaffected by the introduction of the Sn-phase. Diffuse reflectance UV/VIS spectra of the Sn-Z samples confirmed the presence of SnO2 and X-Ray absorption spectroscopy analyses suggested that the SnO2 particles mainly resided on the surface of the clinoptilolite, while ATR-FTIR analysis gave some clues that part of the SnO2 phase was incorporated in the pores of the zeolite. The presence of SnO2 in Sn-Z increased both adsorption capacity and photocatalytic performance which could be partially explained by higher surface area and partially with an increased negative potential of the surface. Adsorption and total degradation of methylene blue (MB) for the Sn-Z with the highest amount of Sn (15 wt.%) was about 30% and 45%, respectively, suggesting a synergetic effect between SnO2 and the clinoptilolite lattice. Reusability tests showed that these catalysts present a promising material for water purification.

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“…These are related to the calcination process of clinoptilolites at 550°C. According to Farías et al [42], the heat treatment applied on clinoptilolites may affect the state and placement of aluminum in clinoptilolites.…”

Section: Ftir Studymentioning

confidence: 99%

“…It is due to the calcination process caused the increase of surface area, total pore volume, and micropore volume of clinoptilolites [46]. At high temperature (500°C), dehydroxylation was occurred in clinoptilolites which lead to the formation of one Lewis site from two Bröensted sites [42].…”

Section: Brunauer-emmett-teller (Bet) Surface Area Measurementmentioning

confidence: 99%

The Use of Clinoptilolites as Carrier of Metformin Hydrochloride in Drug Delivery System: In Vitro Drug Release Study

Putra

Kusumawati

2018

Asian J Pharm Clin Res

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Objective: As an antidiabetic drug, metformin hydrochloride (HCl) has been well known to possess low oral bioavailability and short half-life. In this study, we prepared the drug delivery system (DDS) of metformin HCl and clinoptilolite as its carrier. The in vitro drug release profile was further investigated.Methods: DDS was made by encapsulating metformin HCl on clinoptilolite using the wet impregnation method at various pH and initial concentration of metformin HCl. Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), and N2 Sorption Analyzer were used to characterize the as-synthesized DDS. Drug release study was conducted by stirring the DDS in simulated gastric fluid and simulated intestinal fluid over 12 h.Results: The encapsulation process was achieved optimally at pH 7.0 and initial concentration of metformin HCl of 300 mg/l (CLI2-300 denoted DDS). The results of FTIR and N2 sorption analyzer confirmed the existence of metformin HCl on clinoptilolites. Meanwhile, the XRD result showed that the crystallinity of clinoptilolites remained unchanged after the encapsulation process. The cumulative drug release in the simulated gastric fluid was found to be higher than that in the simulated intestinal fluid, which indicated the potent influence of pH on the release properties of the drugs. The drug release kinetics of metformin HCl from clinoptilolite was best fitted into the Korsmeyer-Peppas model with non-Fickian transport mechanism.Conclusion: We found that clinoptilolite was suitable for DDS application, particularly as a carrier of metformin HCl.

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Preparation of natural zeolitic supports for potential biomedical applications

Cited by 20 publications

References 30 publications

Acid natural clinoptilolite: Structural properties against adsorption/separation of n-paraffins

Acid natural clinoptilolite: Structural properties against adsorption/separation of n-paraffins

SnO2-Containing Clinoptilolite as a Composite Photocatalyst for Dyes Removal from Wastewater under Solar Light

The Use of Clinoptilolites as Carrier of Metformin Hydrochloride in Drug Delivery System: In Vitro Drug Release Study

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