Bactericides of coliform microorganisms from wastewater using silver-clinoptilolite rich tuffs

Rosa-Gómez, Isaías De la; Olguín, M. T.; Alcántara, David

doi:10.1016/j.clay.2007.07.001

Cited by 32 publications

(11 citation statements)

References 10 publications

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“…These equilibrium silvercontents exceed those reported for palygorskite (0.6 wt%) 36 and montmorillonite (8.37 wt%) 37 clays and fall within the range reported for various clinoptilolites (3-18.4 wt%). [38][39][40] XRF analysis of the Ag + -exchanged tobermorite phases, viz. Tob-Ag1 and Tob-Ag4, indicated that 91% and 88% of the original Na + ions had been exchanged for incoming Ag + ions, as had 11% and 7% of the original Ca 2+ ions, respectively (Table 1).…”

Section: Ag + and Zn 2+ Ion Exchange Kineticsmentioning

confidence: 99%

Ag+- and Zn2+-exchange kinetics and antimicrobial properties of 11Å tobermorites

Coleman

Bishop

Booth

et al. 2009

Journal of the European Ceramic Society

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Section: Ag + and Zn 2+ Ion Exchange Kineticsmentioning

confidence: 99%

Ag+- and Zn2+-exchange kinetics and antimicrobial properties of 11Å tobermorites

Coleman

Bishop

Booth

et al. 2009

Journal of the European Ceramic Society

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“…Additionally, a model which proposes the adhesion mechanism of the nanoparticles on the zeolite surface is presented. [14,23].…”

Section: Methodsmentioning

confidence: 99%

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Ruíz-Baltazar

Pérez

2015

Applied Sciences

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Abstract:In this research, the adsorption capacity of Ag nanoparticles on natural zeolite from Oaxaca is presented. In order to describe the adsorption mechanism of silver nanoparticles on zeolite, experimental adsorption models for Ag ions and Ag nanoparticles were carried out. These experimental data obtained by the atomic absorption spectrophotometry technique were compared with theoretical models such as Lagergren first-order, pseudo-second-order, Elovich, and intraparticle diffusion. Correlation factors R 2 of the order of 0.99 were observed. Analysis by transmission electron microscopy describes the distribution of the silver nanoparticles on the zeolite outer surface. Additionally, a chemical characterization of the material was carried out through a dilution process with lithium metaborate. An average value of 9.3 in the Si/Al ratio was observed. Factors such as the adsorption behavior of the silver ions and the Si/Al ratio of the zeolite are very important to support the theoretical models and establish the adsorption mechanism of Ag nanoparticles on natural zeolite.

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“…Besides, started at the beginning of the 21 st century and continuing to this day, studies have shown that natural and synthetic zeolites exchanged by ions of silver, copper, zinc, or some other transition metals exhibit antimicrobial activity toward a broad range of microorganisms [16][17][18][19][20][21][22][23][24][25][26][27][28], and silver-containing zeolites are characterized by the most powerful antibacterial activity [18,23,25]. In general, silver is considered as antibacterial agent with well-known mode of action, bacterial resistance against silver is well described [29], similarities and differences between silver ions and silver in nanoforms as antibacterial agents were discussed recently [30].…”

Section: Introductionmentioning

confidence: 99%

Bactericidal adsorbents obtained by ion exchange modification of natural phillipsite

Tsitsishvili¹,

Dolaberidze²,

Nijaradze³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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Zeolite adsorbents and ion exchangers reducing the concentrations of contaminants in aqueous medium, containing bioactive metals and endowed with bactericidal properties are promising for application in environmental protection practice and medicine. Phillipsite has a high ion exchange capacity and can be used to produce such materials. Silver-, copper-, and zinc-containing micro-mesoporous zeolite materials have been prepared on the basis of natural phillipsite from the Shukhuti field, Western Georgia (Saqartvelo), using ionexchange reactions between grinded and washed by dilute hydrogen chloride solution zeolite and a salt of a corresponding transition metal in the solid phase followed by washing with distilled water. Synthesized in such way adsorbent-ion-exchangers are characterized by chemical analysis and sorption data (nitrogen adsorption-desorption isotherms at 77 K and water vapour sorption at room temperature), powder X-ray diffraction patterns, Fourier transform infra-red spectra, and scanning electron microscope images. Obtained materials keep the crystal structure and general sorption and ion-exchange properties of phillipsite, they contain up to 230 mg/g of silver, 66 mg/g of copper, and 86 mg/g of zinc, which is several times higher than the content of bioactive metals in the cationexchange forms of clinoptilolite and synthetic zeolites obtained by ion exchange in the liquid phase described in the literature. Prepared silver-, copper-, and zinc-containing phillipsites show bactericidal and bacteriostatic activity towards Escherichia coli regardless of whether the number of released ions of the bioactive metal reaches the minimum inhibitory concentration in solution. The procedure of dry ion-exchange synthesis leads to an increase in the dispersion of the material, but does not affect the developed mesoporous system of phillipsite and the total pore volume averaging 0.285 cm 3 /g. The compliance of proposed method for preparation of silver-, copper-, and zinccontaining forms of phillipsite with high environmental standards is confirmed by its low Sheldon's factor E in comparison with the similar green chemistry metrics of conventional methods of the ion exchange in solutions.

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Bactericides of coliform microorganisms from wastewater using silver-clinoptilolite rich tuffs

Cited by 32 publications

References 10 publications

Ag+- and Zn2+-exchange kinetics and antimicrobial properties of 11Å tobermorites

Ag+- and Zn2+-exchange kinetics and antimicrobial properties of 11Å tobermorites

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Bactericidal adsorbents obtained by ion exchange modification of natural phillipsite

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