Purification of Water from Fluoride Ions by a Lanthanum-Containing Ceramic Material

2018 ◽  
Vol 22 (8) ◽  
pp. 28-31 ◽  
Author(s):  
V.Yu. Chukhlanov ◽  
O.G. Selivanov ◽  
E.S. Pikalov ◽  
C.M. Chesnokova ◽  
A.A. Podolets
Keyword(s):  
Ceramic Material ◽  
Mechanical Characteristics ◽  
Binding Capacity ◽  
Environmental Safety ◽  
Fluoride Ion ◽  
Ion Content ◽  
Fluoride Ions ◽  
Phosphate Ions ◽  
Environmentally Safe ◽  
Purification Of Water

Studies have been carried out to create a lanthanum-containing ceramic material that can be used to purify water from fluoride ions. A composition was developed for the preparation of a ceramic material, the physico-mechanical characteristics of its samples were determined, and their binding capacity to fluoride ions was investigated. There was researched environmental safety of a material. It is proved that when 6% by weight of lanthanum carbonate is added to the charge, an environmentally safe material for cleaning aqueous systems with a fluoride ion content of up to 10 mg/l can be obtained. It has been established that this material can be used with sufficient efficiency to purify water from phosphate ions.

scholarly journals Zero Budget Natural Farming in India: Aiming Back to the Basics

2020 ◽  
pp. 38-52
Author(s):  
Saikat Biswas
Keyword(s):  
Food Security ◽  
Green Revolution ◽  
Environmental Safety ◽  
Indian States ◽  
Public And Private ◽  
Indian Agriculture ◽  
South Indian ◽  
Inadequate Information ◽  
Environmentally Safe ◽  
Natural Farming

Crisis of Indian agriculture is very pertinent at this moment as green revolution is gradually losing its hope. Excessive, pointless exploitation of broods of green revolution has left bad footprints on country’s food security and environmental safety. With the motto to ensure food security by reviving Indian agriculture in environmentally safe way as well as to release farmers from debt cycle and suicides, zero budget natural farming (ZBNF) has come in the picture, which discards uses of all the chemical farming inputs and relies on natural way of farming i.e. rejuvenating soil and crop health through its own practices (Jivamrita, Bijamrita, mulching, soil aeration, intercropping, crop diversification, bunds, bio-pesticides etc.). ZBNF movement right now is the most popular agrarian movement which begun in 2002 in Karnataka and later successfully spread in many states (specially, of South India) of the nation through numbers of trainings, demonstrations and various promotional activities. Successful outcomes from farmers’ fields of south Indian states like Andhra Pradesh, Karnataka etc. are encouraging and grabbing attention of farmers, public and private organisations towards ZBNF in recent times. Yet, various controversies regarding its transparency,      inadequate information, efficacy, practices, idealisms, even the term ‘zero budget’ etc. have agglutinated around ZBNF over the years since it debuted. Critics in fact have cited several references of drastic yield reductions with ZBNF practices in many places. Adequate scientific evaluation or monitoring of ZBNF’s successes or failures through multi-locational trials is now therefore the needful before allowing or restraining its run in Indian agriculture.

ПРИНЦИПЫ ЭКОЛОГИЧЕСКИ БЕЗОПАСНОГО ВОДОРЕСУРСНОГО ОБЕСПЕЧЕНИЯ АГРОЛАНДШАФТОВ

2020 ◽  
pp. 9
Author(s):  
V.B. Zhezmer ◽  
A.O. Shcherbakov
Keyword(s):  
Water Resources ◽  
Water Supply ◽  
Conceptual Model ◽  
Monitoring System ◽  
Environmental Safety ◽  
Hydraulic Structures ◽  
Reclaimed Land ◽  
Web Technologies ◽  
Database Structure ◽  
Environmentally Safe

Разработка принципов экологически безопасной эксплуатации агроландшафта при условии обеспечения оросительной водой не только используемых в настоящее время орошаемых площадей, но и выбывших из оборота мелиорированных земель, является актуальной и востребованной. Экологическая безопасность водообеспечения предполагает как экономию водных ресурсов, так и повышение безопасности эксплуатации гидромелиоративных систем (ГМС). В статье обоснована необходимость, с целью обеспечения безопасности гидротехнических сооружений, создания системы автоматизированного ведения мониторинга гидротехнических сооружений (ГТС) на основе современных веб-технологий, представлена концептуальная модель системы мониторинга, а также структура базы данных и принципы работы с массивами информации.The development of the principles of the environmentally safe operation of the agro-landscap, provided that irrigated water is provided not only for the currently used irrigated areas, but also all reclaimed land, is relevant and in demand. Environmental safety of water supply involves both saving water resources and improving the safety of the operation of irrigation and drainage systems (HMS). The article substantiates the need, in order to ensure the safety of hydraulic structures, the creation of a system for automated monitoring of hydraulic structures (GTS) based on modern web technologies, presents a conceptual model of a monitoring system, as well as a database structure and principles for working with arrays of information.

Si-corrole-based fluoride fluorometric turn-on sensor

2020 ◽  
Vol 24 (05n07) ◽  
pp. 929-937
Author(s):  
Ewa Jaworska ◽  
Fabrizio Caroleo ◽  
Corrado Di Natale ◽  
Krzysztof Maksymiuk ◽  
Roberto Paolesse ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Linear Dependence ◽  
Porous Membrane ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Fluoride Ions ◽  
Acidic Solutions ◽  
Turn On ◽  
New Type ◽  
Receptor Layer

We present here a new type of fluoride ion optode, constituted by a highly lipophilic PVDF porous membrane modified with a liquid receptor layer containing the emission-active Si corrole F[Formula: see text] selective ionophore. For the optimized composition of the receptor layer, in acidic solutions an increase of Si-corrole emission was observed by increasing fluoride ion concentration, a behavior different from most porphyrinoid-based optical sensors. An observed linear dependence of the Si corrole emission intensity (read at 635 nm) was within the range 10[Formula: see text] to 10[Formula: see text] M of fluoride ions.

scholarly journals Mechanical and Functional Properties of a Novel Apatite-Ionomer Cement for Prevention and Remineralization of Dental Caries

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3998 ◽  
Author(s):  
Rie Imataki ◽  
Yukari Shinonaga ◽  
Takako Nishimura ◽  
Yoko Abe ◽  
Kenji Arita
Keyword(s):  
Fracture Toughness ◽  
Functional Properties ◽  
Glass Ionomer Cement ◽  
Pediatric Dentistry ◽  
Cement Matrix ◽  
Fluoride Ion ◽  
Ion Release ◽  
Fluoride Ions ◽  
Acid Buffer ◽  
Ionomer Cement

Especially in pediatric dentistry, prevention by the control of initial lesions prior to cavitation is very important, and application of a pit and fissure sealant is essential to achieve this. Numerous reports have suggested that resin-based sealants are inferior to sealants based on glass-ionomer cement (GIC), because of GIC’s many advantages, such as fluoride ion release properties and its good adhesion to tooth structures. However, the use of GIC is impeded due to its low flexural strength and fracture toughness. In this paper, we developed and characterized an apatite-ionomer cement (AIC) that incorporates hydroxyapatite (HAp) into the GIC; this development was aimed at not only reinforcing the flexural and compressive strength but also improving some functional properties for the creation of the material suitable for sealant. We examined the influence of differences in the compounding conditions of GIC powder, liquid, and HAp on flexural and compressive strengths, fracture toughness, fluoride ion release property, shear bond strength to bovine enamel, surface pH of setting cements, and acid buffer capability. These methods were aimed at elucidating the reaction mechanism of porous spherical-shaped HAp (HApS) in AIC. The following observations were deduced. (1) HAp can improve the mechanical strengths of AIC by strengthening the cement matrix. (2) The functional properties of AIC, such as acid buffer capability, improved by increasing the releasing amounts of various ions including fluoride ions. The novel AIC developed in this study is a clinically effective dental material for prevention and remineralization of tooth and initial carious lesion.

scholarly journals Ratiometric sensing of fluoride ions using Raman spectroscopy

2020 ◽  
Vol 56 (92) ◽  
pp. 14463-14466
Author(s):  
William J. Tipping ◽  
Liam T. Wilson ◽  
Sonja K. Blaseio ◽  
Nicholas C. O. Tomkinson ◽  
Karen Faulds ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Fluoride Ion ◽  
Ion Detection ◽  
Fluoride Ions ◽  
Ratiometric Sensing ◽  
Ratiometric Sensor

A simple ratiometric sensor based on Raman spectroscopy enables rapid fluoride ion detection in a paper-based assay using a portable spectrometer.

scholarly journals Fluoride ion adsorption from wastewater using magnesium(II), aluminum(III) and titanium(IV) modified natural zeolite: kinetics, thermodynamics, and mechanistic aspects of adsorption

2017 ◽  
Vol 8 (4) ◽  
pp. 479-489 ◽  
Author(s):  
Zhijun Ma ◽  
Qi Zhang ◽  
Xingyuan Weng ◽  
Changye Mang ◽  
Liwei Si ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Adsorption Process ◽  
Fluoride Ion ◽  
Ion Adsorption ◽  
Order Model ◽  
Fluoride Ions ◽  
Modified Zeolite ◽  
Fluoride Adsorption ◽  
Pseudo Second Order ◽  
Modified Zeolites

Abstract Natural zeolite was modified using metal ions, including magnesium(II), aluminum(III) and titanium(IV). The modified zeolite was then used as an adsorbent for the investigation of the adsorption kinetics, isotherms, and thermodynamic parameters of fluoride ions in wastewater at various pHs and temperatures. The kinetics and thermodynamics for the removal of the fluoride ions onto the modified zeolite have also been investigated. The fluoride ion adsorption capacity of the three types of modified zeolites exhibited an increase, then decrease, with rising pH. The fluoride adsorption capacity of the modified zeolites decreased with an increase in temperature. The pseudo-second-order model is more suitable for describing the adsorption kinetic data than the pseudo-first-order model for modified zeolite and the adsorption process of the fluoride ions reveals pseudo-second-order kinetic behavior, respectively. It was found that the adsorption equilibrium data fit the Freundlich isothermal equation better than that of the Langmuir isothermal and Dubinin–Radushkevich (D–R) isothermal equations. Thermodynamic analysis suggests that the negative values of ΔG0 and ΔH0 further indicate that the fluoride adsorption process is both spontaneous and exothermic. The results of competitive adsorption tests suggest that the modified metal zeolite materials adsorb fluoride ions with high selectivity.

Electrical Characterization of the Structure and Other Phenomena in Superionic PbSnF4

1995 ◽  
Vol 411 ◽  
Author(s):  
Galina Milova ◽  
Georges Denes ◽  
M. Cecilia Madamba ◽  
M. Perfiliev
Keyword(s):  
Ion Mobility ◽  
Complex Impedance ◽  
Electrical Characterization ◽  
Fold Increase ◽  
Fluoride Ion ◽  
Fluoride Ions ◽  
Covalently Bonded ◽  
Frenkel Defects ◽  
Fluorite Type

ABSTRACTThe structure of PbSnF4 is derived from that of fluorite-type β-PbF2 The replacement of half the lead by tin results in a thousand-fold increase of the fluoride ion mobility, even though tin-fluorine bonds are strongly covalent. This is due to an increase of fluoride ion disorder on some sites. The structure of α-PbSnF4 can be interpreted as resulting from the insertion of two layers of [SnF]+ cations between each pair of layers of PbF8 cubes. This has profound bearings on the texture and properties of this material, since the tin(II) stereoactive lone pairs create very effective cleavage planes. In addition, the fluorine covalently bonded to tin occupy all vacant sites used to create Frenkel defects. However, superionicity is observed by complex impedance measurements. Transport number measurements show that fluoride ions are the charge carriers.

Superparamagnetic Ag@Co-Nanocomposites on Granulated Cation Exchange Polymeric Matrices with Enhanced Antibacterial Activity for the Environmentally Safe Purification of Water

2012 ◽  
Vol 23 (19) ◽  
pp. 2450-2458 ◽  
Author(s):  
Amanda Alonso ◽  
Xavier Muñoz-Berbel ◽  
Núria Vigués ◽  
Rosalía Rodríguez-Rodríguez ◽  
Jorge Macanás ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Cation Exchange ◽  
Polymeric Matrices ◽  
Environmentally Safe ◽  
Purification Of Water

Characterisation of passive film and corrosion behaviour of a new Ti-Ta-Zr alloy in artificial oral media: In time influence of pH and fluoride ion content

2015 ◽  
Vol 66 (9) ◽  
pp. 971-981 ◽  
Author(s):  
C. Vasilescu ◽  
S. I. Drob ◽  
P. Osiceanu ◽  
J. M. Calderon-Moreno ◽  
P. Drob ◽  
...  
Keyword(s):  
Passive Film ◽  
Corrosion Behaviour ◽  
Fluoride Ion ◽  
Ion Content ◽  
Influence Of Ph ◽  
Zr Alloy

A gadolinium(iii) complex based dual-modal probe for MRI and fluorescence sensing of fluoride ions in aqueous medium and in vivo

2016 ◽  
Vol 45 (44) ◽  
pp. 17616-17623 ◽  
Author(s):  
Yue Wang ◽  
Renfeng Song ◽  
Ke Guo ◽  
Qingtao Meng ◽  
Run Zhang ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Aqueous Media ◽  
Fluoride Ion ◽  
Fluorescence Sensing ◽  
Fluoride Ions

A novel Gd(iii) complex based dual-modal probe, Gd(TTA)3-DPPZ was designed and assembled for the simultaneous fluoride ion in aqueous media and in vivo.

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