Radiation-modified natural zeolites for cleaning liquid nuclear waste (irradiation against radioactivity)

Yeritsyan, Hrant N.; Sahakyan, Aram A.; Harutyunyan, V. V.; Nikoghosyan, S.K.; Hakhverdyan, Eleonora A.; Grigoryan, N. E.; Hovhannisyan, A.; Atoyan, V.; Keheyan, Yeghis; Rhodes, Christopher J.

doi:10.1038/srep02900

Cited by 40 publications

(24 citation statements)

References 11 publications

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“…As a biochemical sieve, feed and food additive, gas and odor absorber, CZ is widely used in agriculture, medicine, pollution control, and food industry. CZ is a very effective ion exchanger, it is used to remove radioactive 137 Cs and 90 Sr from nuclear waste and fallout, 10,11 and ammonia from sewage streams. 6 Pharmacological and clinical studies demonstrate that CZ is inert, does not produce biological damage to humans, and modified CZs have antimicrobial, gastric antacid, antidiarrheic, and antihyperglycemic features.…”

Section: Introductionmentioning

confidence: 99%

Natural zeolite for adsorbing and release of functional materials

et al. 2018

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Using multiphoton microscopy (MPM), we demonstrated that effective inducing of two-photon excited luminescence and second-harmonic generation signals in nano/microparticles of clinoptilolite type of zeolite (CZ) by femtosecond near-infrared laser excitation can be successfully utilized in multiphoton imaging of the drug adsorption processes. Adsorption of photodynamic active dyes (hypericin, chlorin e6, methylene blue, and fluorescein) and their release from CZ pores in the presence of biomolecules, such as collagen from bovine Achilles tendon, albumin, and hemoglobin, were investigated by absorption and fluorescence spectrometry. To quantify the experimental results on hypericin release, here we use a kinetic curves fitting approach and calculate hypericin release rates in different environments. This approach allows to compare various mathematical models and uses more parameters to better characterize drug release profiles. In addition, magnetic CZ particles were fabricated and proposed as a promising material for drug delivery and controlled release in biological systems. Optical spectrometry and MPM are effective approaches that may reveal potential of natural zeolites in controlled drug delivery and biomedical imaging.

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Section: Introductionmentioning

confidence: 99%

Natural zeolite for adsorbing and release of functional materials

et al. 2018

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“…The basic physico-chemical parameters of the water measured with a YSI hand-held (Yellow Spring Instrument). During the study ammonia (NH3 and TAN) levels were calculated from NH4 + , water temperature and pH values (EPA, 1999;Emerson et al, 1975;YSI, 2007). Experimental values were showed mean ± standard error (Minitab 17).…”

Section: Methodsmentioning

confidence: 99%

Investigation of Ammonium Saturation and Desorption Conditions of Clinoptilolite Type Zeolite in Aquarium Conditions

Öz

Şahin

Öz

et al. 2017

Turkish JAF Sci.Tech.

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In this research, it was aimed to determine the adsorption, saturation reaching and desorption effects of ammonium, which is one of the parameters that should be kept in control for aquarium life, by clinoptilolite type zeolite which is a natural filtration material. In the aquarium water, Z1: 20 mg/l TAN and Z2: 40 mg/l TAN concentrations were determined to have adsorption up to Z1: 10 mg/l TAN and Z2: 24 mg/l TAN concentration at the end of the experiment period. After this phase, where zeolites had reached saturation, desorption system was created, and 2 groups were formed with 5-liter research aquariums and 3 repetitions. During the five-days test, water parameters were determined daily and at the same time of day (10.00). At the beginning of the experiment, mean values of 0.4 ± 0.00 mg / l TAN in Z1 and Z2 groups were determined at the end of the experiment as 1.55 ± 0.176 mg/l (15.5%) and 2.153 ± 0.27 mg/l (13.5%) TAN in Z1 and Z2 groups, respectively. When the data obtained in this study were evaluated, zeolite was determined to make desorption periodically in proportion with the amount of retained ammonium, when it reached the saturation. In intensive aquaculture systems or aquarium conditions, recondition of zeolite for necessary periods is recommended to be performed by considering these data. Akvaryum Koşullarında Kinoptilolit Türü Zeolitin Amonyum Doygunluğunun ve Desorpsiyon Koşullarının İncelenmesiGeliş GG Ay YYYY Kabul GG Ay YYYY Bu çalışmada, doğal bir filtrasyon materyali olan klinoptilolit türü zeolitin, akvaryum yaşamının kontrol altında tutulması için zorunlu olan parametrelerden amonyumun adsorpsiyonunu, doygunluğa ulaşmasını ve desorpsiyonunu belirlemek amaçlanmıştır. Akvaryum suyunda başlangıçta Z1: 20 mg/l TAN ve Z2: 40 mg/l TAN olarak belirlenen konsantrasyonların, deneme sonunda Z1'de 10 mg/l TAN ve Z2'de 24 mg/l TAN konsantrasyonlarına kadar adsorplandığı saptanmıştır. Zeolitlerin doygunluğa ulaştığı bu safhadan sonra desorpsiyon sistemi düzenlenerek 5 litrelik akvaryumlarda 3 tekerrürlü 2 grup oluşturulmuştur. Beş günlük araştırma süresince her gün aynı saatte (10.00) su parametreleri belirlenmiştir. Denemenin başlangıcında Z1 ve Z2 gruplarında 0,4 ± 0,00 mg/l TAN ortalama değerleri, deneme sonunda Z1 ve Z2 gruplarında TAN değerleri sırasıyla 1,55 ± 0,176 mg/l (%15,5) ve 2,153 ± 0,27 mg/l (%13,5) olarak tespit edilmiştir. Bu çalışmada elde edilen veriler değerlendirildiğinde, zeolitin doygunluğa ulaştığı zaman, tutulan amonyum miktarı ile orantılı olarak desorpsiyon yaptığı tespit edilmiştir. Yoğun akuakültür sistemleri veya akvaryum koşullarında, bu veriler dikkate alınarak, belirli sürelerde zeolitin yeniden aktifleştirilmesi önerilmektedir.

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“…In most of the cases, Mg-OH bonds within the octahedron sheet can break easily because of the reaction 2OH / H 2 O + O. 17,45,46 When Mg-OH bonds are broken, the octahedron structure becomes unstable, 47 probably resulting in two results. One is that the octahedron deforms into a hexahedron.…”

Section: Chemical Structure Analysismentioning

confidence: 99%

“…They can easily react with the sample matrix, such as the tetrahedron or octahedron sheets. 45 Aer these reactions, extra H atoms or OH groups are introduced, which would enlarge the tetrahedron or octahedron units, increasing d as the expansion can easily occur along the z direction as compared to those along the x and y directions. 49 This assumption could probably explain the increase in d aer irradiation, as conrmed by the XRD measurements.…”

Section: Thermal Stability Analysismentioning

confidence: 99%