Modification on natural clinoptilolite zeolite for its NH4+ retention capacity

Jha, Vinay Kumar; Hayashi, Shigeo

doi:10.1016/j.jhazmat.2009.03.052

Cited by 146 publications

(46 citation statements)

References 22 publications

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“…As it was shown in [28], the clinoptilolite selectivity to ammonium is a result of replacement of all sodium ions from the zeolitic exchange sites with ammonium. The ion exchange between Na + and NH 4 + in the clinoptilolite matrix was also reported by Ming and Dixon [25] and Jha and Hayashi [29].…”

Section: Characteristics Of Clinoptilolitesupporting

confidence: 76%

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Application of Ammonium-Selective Zeolite for Enhancement of Conductometric Bi-Enzyme Biosensor for L-Arginine Detection

Saiapina

Matsishin

Pyeshkova

et al. 2012

SEMST

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Abstract. L-arginine conductometric biosensors were developed on the basis of arginase and urease cross-linked by glutaraldehyde in a single bioselective membrane and modified with clinoptilolite. The clinoptilolite intrinsic properties helpful for conductometric detection of L-arginine were investigated using three approaches to the creation of zeolite-containing enzymatic membranes. The developed biosensors were compared with the L-arginine biosensor, not modified with clinoptilolite, for the sensitivity, linear and dynamic range, detection limit, response time, operational and storage stability in L-arginine analysis. It was shown that the incorporation of ammonium-selective zeolite to the bioselective membrane of L-arginine biosensor allows increasing the biosensor sensitivity when applying all proposed approaches to the formation of zeolite-containing biomembranes. In addition, excellent values of both detection limit and linear range (1.0×10-5 M and 0.01-6 mM, respectively) were achieved for the biosensor based on arginase, urease and zeolite distributed in a single bioselective layer. The clinoptilolite-based biosensors for L-arginine demonstrated short response time, high operational stability (a coefficient of variations reached 0.74%), their lifetime exceeded four months.Keywords: L-arginine; Clinoptilolite; Conductometric biosensor; Arginase; Urease ЗАСТОСУВАННЯ АМОНІЙ-СЕЛЕКТИВНОГО ЦЕОЛІТУ ДЛЯ ПОКРАЩЕННЯ КОНДУКТОМЕТРИЧНОГО ДВОФЕРМЕНТНОГО БІОСЕНСОРА ДЛЯ ВИЗНАЧЕННЯАнотація. Розроблено кондуктометричні біосенсори для визначення L-аргініну на основі аргінази та уреази, іммобілізованих в одній біоселективній мембрані методом поперечного зшивання за допомогою глутарового альдегіду та модифікованій клиноптилолітом. Характерні властивості клиноптилоліту, корисні для кондуктометричного визначення L-аргініну, були до-слідженні за допомогою трьох підходів для створення цеоліт-вмісних ферментних мембран. Розроблені біосенсори порівнювали з біосенсором для визначення L-аргініну, який не був мо-дифікований клиноптилолітом, за такими показниками, як чутливість, лінійний і динамічний діапазон, нижня межа визначення, час відгуку, операційна стабільність і стабільність при збе-ріганні. Показано, що включення амоній-селективного цеоліту до складу біоселективної мемб-рани L-аргінінового біосенсора дозволяє підвищити чутливість біосенсора, застосовуючи всі запропоновані підходи для формування цеоліт-вмісних біомембран. Крім того було отримано чудові значення нижньої межі визначення та лінійного діапазону (1,0×10-5 М та 0,01-6 мМ від-повідно) у біосенсора, у якому аргіназа, уреаза та цеоліт були розподілені в єдиному біоселек-тивному шарі. Біосенсори для визначення L-аргініну на основі клиноптилоліту мали короткий час відгуку, високу операційну стабільність (коефіцієнт варіації досягав 0,74%), а їх стабіль-ність при зберіганні була вища за чотири місяці. Аннотация. Разработаны кондуктометрические биосенсоры для определения L-аргинина на основе аргиназы и уреазы, иммобилизованных в одной биоселективной мембране методом попе...

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Section: Characteristics Of Clinoptilolitesupporting

confidence: 76%

“…10 . Purity was checked by X-ray diffraction, thermogravimetric analysis, 29 Si and 27 Al nuclear magnetic resonance. The structure was typical for the Heulandite family of tectosilicates (sheet-like) and its morphology revealed monoclinic crystal form with platelets 10-20 nm thick (Fig.…”

Section: Characteristics Of Clinoptilolitementioning

confidence: 99%

Application of Ammonium-Selective Zeolite for Enhancement of Conductometric Bi-Enzyme Biosensor for L-Arginine Detection

Saiapina

Matsishin

Pyeshkova

et al. 2012

SEMST

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“…The negative values reflect feasibility of all the adsorbents and the spontaneity of the adsorption process. For the investigation of the rate law describing the adsorption capacity, kinetic data obtained from batch experiments were analysed using first order 16 and the psuedosecond order 13 equations. The equations were rearranged to obtain the linear form as follows: The calculated data from the plots of Log 10 (Q e -Q t ) and t/ Q t as a function of reaction time are shown in Table 2.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Preparation of activated charcoal adsorbent from waste tire

Barai

Jha

2012

Sci World

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Activated carbons were prepared from waste tire in two different routes. Some physical properties of thus prepared activated carbons were measured and the characterization of their phases was done by XRD measurement. The adsorption isotherms of methylene blue were simulated by the Langmuir and Freundlich isotherms. The Langmuir isotherms were found to have better fitting with Q max values 0.227, 0.255 and 0.256 mmol/g for the activated carbons prepared in air, nitrogen, nitrogen and steam respectively while it was 0.275 mmol/g for activated carbon impregnated with H 3 PO 4 . The overall reaction was found to be pseudo-second order with the rate constant of 8.314 × 10 -4 Lg/(mmolmin). The surface area of the best prepared activated carbon was 334.2 m 2 /g.

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“…Among the various removal technologies of heavy metals from water and wastewater, sorption by zeolites has been deeply studied due to their effi ciency, economical aspects and ease of access. Special characteristics of natural zeolites such as clinoptilolite include ion exchange capability, molecular sieve, abundance, low cost, capability to be used as a support for photocatalysts and compatibility with the environment 10, 11 . The internal crystalline and complex structure has led to high specifi c surface area of these natural compounds up to 300 m 2 /g 12-14 .…”

mentioning

confidence: 99%

Adsorption of Cr(VI) by Natural Clinoptilolite Zeolite from Aqueous Solutions: Isotherms and Kinetics

Jorfi

Ahmadi

Pourfadakari

et al. 2017

Polish Journal of Chemical Technology

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The main aim of this study was to evaluate the effi ciency of natural zeolite for Cr(VI) removal from aqueous solutions. Following simple modifi cation of adsorbent, the effect of operational parameters including pH (2-10), adsorbent dosage (2-20 g/L), contact time (5-150 min) and Cr(VI) concentration (10-50 mg/L) were studied according to one-factor-at-a-time procedure. The maximum Cr(VI) removal of 99.53% was obtained at initial pH of 2, contact time of 30 min, adsorbent dosage of 8 g/L and initial chromium concentration of 10 mg/L. The Freundlich isotherm was best fi tted with experimental data (R2 = 0.951). Also, type 1pseudo second order kinetic model showed the most correlation (R2 = 1) with the experimental data. According to obtained results, it can be concluded that the application of clay-like adsorbents such as natural clinoptilolite zeolite can be considered as an effi cient alternative for fi nal treatment of effl uents containing Cr(VI).

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Modification on natural clinoptilolite zeolite for its NH4+ retention capacity

Cited by 146 publications

References 22 publications

Application of Ammonium-Selective Zeolite for Enhancement of Conductometric Bi-Enzyme Biosensor for L-Arginine Detection

Application of Ammonium-Selective Zeolite for Enhancement of Conductometric Bi-Enzyme Biosensor for L-Arginine Detection

Preparation of activated charcoal adsorbent from waste tire

Adsorption of Cr(VI) by Natural Clinoptilolite Zeolite from Aqueous Solutions: Isotherms and Kinetics

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