The chemical behavior of natural zeolites in aqueous environments: Interactions between low-silica zeolites and 1 M NaCl solutions of different initial pH-values

Filippidis, Anestis; Γοδελίτσας, Α.; Charistos, D.; Μisaelides, P.; Kassoli-Fournaraki, A.

doi:10.1016/s0169-1317(96)00025-7

Cited by 69 publications

(30 citation statements)

References 12 publications

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“…This increase is attributed to the buffer effects of clinoptilolite when added to acidic or basic aqueous solutions [4]. However, at the first rumen fluid collection time the difference of the pH values was not significant among the groups, indicating that it is required more than 5 h from the first administration of clinoptilolite in order to increase the ruminal pH.…”

Section: Discussionmentioning

confidence: 91%

“…These hydrated aluminosilicates of alkali and alkaline earth cations have unique properties such as the ability to lose and gain water reversibly to absorb molecules of appropriate diameter (absorption property) or acting as molecular sieves and to exchange their constituent cations without major change of their structure (ion-exchange property) [3,4]. These properties make zeolites useful in animal nutrition.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their ion-exchange property, natural zeolites, when added to acidic or basic aqueous solutions, act as regulatory factors [4]. Although many researchers have attempted to use this property in order to regulate the pH of rumen content for changing the fermentation patterns and for the prevention of subacute ruminal acidosis, their results have been contradictory.…”

Section: Introductionmentioning

confidence: 99%

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Effects of In-Feed Inclusion of Clinoptilolite on Blood Serum Concentrations of Aluminium and Inorganic Phosphorus and on Ruminal Ph and Volatile Fatty Acid Concentrations in Dairy Cows

Karatzia

Pourliotis

Katsoulos

et al. 2010

Biol Trace Elem Res

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The experiment investigated the effects of the dietary inclusion of 200 g of the natural zeolite, clinoptilolite on the blood serum concentrations of aluminium (Al) and inorganic phosphorus (P) as well as on the ruminal pH and the ruminal concentrations of Al and P and of certain volatile fatty acids. Sixteen Holstein cows with a rumen fistula were randomly assigned to one of two groups. Group A cows (n = 8) were fed the basal ration supplemented with 200 g of clinoptilolite per day, and group B cows (n = 8) were fed the basal ration and served as controls. Blood and rumen fluid samples were collected at the same day of each week and at the same time (5 h after morning feeding) for 12 weeks. Clinoptilolite supplementation had no significant effect on ruminal and blood serum concentrations of Al and P. However, clinoptilolite significantly increased ruminal pH and acetate, and decreased ruminal propionate and valerate.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of In-Feed Inclusion of Clinoptilolite on Blood Serum Concentrations of Aluminium and Inorganic Phosphorus and on Ruminal Ph and Volatile Fatty Acid Concentrations in Dairy Cows

Karatzia

Pourliotis

Katsoulos

et al. 2010

Biol Trace Elem Res

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“…The nanopore sizes modulate their unique catalytic properties. Such inorganic molecules with pore sizes ranging from less than 2 nm to 50 nm, can absorb gas and water molecules, facilitate ion exchange and acts as "molecular sieves" with long-term chemical and biological stability (29)(30)(31). The positively charged metal ions (i. e. Na + , K ) -pores.…”

Section: Introductionmentioning

confidence: 99%

Zeolite clinoptilolite nanoporous feed additive for animals of veterinary importance: potentials and limitations

et al. 2017

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I n the past two decades many substances of natural or synthetic origin were studied as potential alternatives to antibiotic growth promoters (AGP) and some of them, particularly immunomodulators (IMs) and nutraceuticals (NCs), have shown to be capable of stimulating functions of the immune system and improving general health. At the same time, they were shown to be harmless for animals and the environment. Promising results have been obtained with natural clay minerals, zeolites among which clinoptilolite (CPL) is the best known as zootechnical and biomedical feed ingredient widely reported in scientific literature and used in farm animal nutrition. CPL has a potential to replace AGP due to its unique anti-bacterial properties, safety and efficacy as dietary supplement in food animals unifying potentials of an IM and NC. Currently, there INTRODUCTIONT he phrase "survival of the fittest" as an alternative to "natural selection" has been adopted and published in 1868 by Charles Darwin (1), and nowadays is becoming so true because of the rapid emergence of antibiotic resistant strains of pathogenic microbes of biomedical, particularly veterinary importance. This is a consequence of non-clinical use and misuse of dietary antibiotics for more than sixty years to prevent bacterial infections and to enhance performance in livestock production, mostly in chickens and pigs (2). Namely, the increased sanitary problems in intensive farming of food animals have been overcome thus far by adding sub-therapeutic doses of antibiotic growth promoters (AGP) infeed to enhance production efficiency by increasing growth rate, improv- ing feed utilization and reducing mortality from clinical disease is well documented particularly in swine production systems (3). However, the consumers especially in developed countries are becoming increasingly concerned about drug residues in meat and other animal products (4). In addition, it has been suggested that the continuous use of antibiotics may contribute to a reservoir of drugresistant bacteria (5) which may be capable of transferring their resistance to pathogenic bacteria in both animals and humans (6). As a result, many countries have banned or are banning the inclusion of antibiotics in diets as a routine means of growth promotion. The first experience of an AGP ban in Sweden in 1986 indicated a reduction in growth and an increase in morbidity and mortality rates in weaned pigs, which emphasized the importance of antibiotic use in intensive swine production(7). The total ban of dietary AGP in the EU countries since January 1, 2006 (EU Regulation No. 1831 and the elimination of their use in animal feed and water in the USA effective January 1, 2017 (FDA, CVM 2012, VFD Basics 2017) has had a serious influence on both health and performance of food animals underlining the need to develop alternative dietary and non-dietary strategies to evaluate the potential antimicrobial agents for their replacement (8). According to the World Health Organization, most antibiotics will not ...

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“…In other studies, especially those which were conducted at high pH of ≥6, it was considered that the mechanism of Cu removal was based on precipitation of metal hydroxides on the surface of zeolites or inside the pore walls. In the study on heavy metal adsorption on natural zeolite (clinoptilolite) by Filippidis [34], a selectivity sequence of Fe 3+ > Zn 2+ > Cu 2+ > Mn 2+ was reported. This sequence however, was not according to the hydration diameters of the heavy metals.…”

Section: Nhmentioning

confidence: 99%

Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

Kabwadza-Corner¹,

Munthali²,

Johan³

et al. 2014

AJAC

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The objectives of the study were to find the type and species of zeolite which gives optimum adsorption of copper, provide an explanation of the mechanism involved in the adsorption process and establish the selectivity sequence among zeolites. Adsorption of Cu onto zeolites and montmorillonite as a reference was conducted at an initial Cu concentration range of 0 -0.60 mM in the presence of 100 mM NH 4 NO 3 at initial pH of 5. Langmuir and Freundlich models were used in analyzing the equilibrium data and a selectivity sequence derived from the Langmuir calculation was A4 > faujasite X > modernite > Na-P1 ≈ montmorillonite ≈ faujasite Y > clinoptilolite. Zeolites A4 and faujasite X had high adsorptive capacities of 1429 mmol·kg −1 and 909 mmol·kg −1 , respectively. Zeolite A4 has the highest CEC among all the samples (6150 mmol·kg −1 ), and the adsorption capacity of Cu was largely influenced by the CEC of the samples. The adsorption mechanism was based on the exchange of Cu from solution with mostly Na which was the main exchangeable cation available. These results are important in selecting the most effective and suitable adsorbent for Cu removal from polluted environments.

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The chemical behavior of natural zeolites in aqueous environments: Interactions between low-silica zeolites and 1 M NaCl solutions of different initial pH-values

Cited by 69 publications

References 12 publications

Effects of In-Feed Inclusion of Clinoptilolite on Blood Serum Concentrations of Aluminium and Inorganic Phosphorus and on Ruminal Ph and Volatile Fatty Acid Concentrations in Dairy Cows

Effects of In-Feed Inclusion of Clinoptilolite on Blood Serum Concentrations of Aluminium and Inorganic Phosphorus and on Ruminal Ph and Volatile Fatty Acid Concentrations in Dairy Cows

Zeolite clinoptilolite nanoporous feed additive for animals of veterinary importance: potentials and limitations

Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

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