Biomimetically Synthesized Luminescent Tb3+-Doped Fluorapatite/Agar Nanocomposite for Detecting UO22+, Cu2+, and Cr3+ Ions

2021 ◽  
Author(s):  
Hongjuan Liu ◽  
Xianli Wang ◽  
Thulitha Abeywickrama ◽  
Forough Jahanbazi ◽  
Zefu Min ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Waters ◽  
Rapid Methods

Radionuclides and heavy metal ions have become the main harmful pollutants in the environment. Developing sensitive and rapid methods to detect them from natural or waste waters is important to...

scholarly journals Heavy Non-ferrous Metals Adsorption from Water Solutions with Granular Filtering Materials Based on Silicon Rock

2018 ◽  
Author(s):  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Salt Content ◽  
Human Beings ◽  
Waste Waters ◽  
Metal Compounds ◽  
Physical Chemical ◽  
Siliceous Rocks

Water factor plays an important role in formation of healthy environment for human beings. Due to unfavorable anthropogenic impact upon environment certain surface and groundwater water supply sources are contaminated with heavy metal compounds. Clints (siliceous rocks) are considered the most promising materials for the natural and waste waters treatment from such ingredients. The paper presents the results of the siliceous rocks’ physical/chemical and operational properties studying. It has been shown that these siliceous rocks satisfy all requirements to filtering materials. Methods of physical/chemical analysis were applied for studying the adsorption processes nature. It was for the first time stated (with methods of potentiometric titration and infra-red spectroscopy) that siliceous rocks included the fixed functional ion-exchange groups in their composition and were subacid cationits. Beside chemical adsorption heavy metal ions interact with siliceous rocks due to the action of their physical nature forces. Physical adsorption contributes the most in the heavy metal compounds up-taking by filtering materials, this is supported by the fact of low values of the process activation energy: from 3 to 8 kJ/gram-molecule. Parameters of the process of heavy metal ions adsorption with siliceous rocks in static and dynamic conditions have been calculated in accordance with the experimental results. Influence of salt content and the liquid phase pH value on the adsorption process has been stated. Optimal conditions for the worked siliceous rocks regeneration have been determined. New data on heavy metals cations adsorption with nuclear filtering materials confirm principal possibility of their use for natural and waste waters treatment.

scholarly journals A METHOD FOR ACCELERATING ELECTROCHEMICAL PHYTOREMEDIATIONOF WASTE WATER FROM HEAVY METAL IONS WHEN EXPOSED TO PHYTOSORBENT PLANTS BY PHYSICAL FIELDS

2020 ◽  
pp. 132-143
Author(s):  
L.N. Olshanskaya ◽  
R.Sh. Valiev ◽  
T.V. Osipova
Keyword(s):  
Magnetic Field ◽  
Heavy Metal ◽  
Metal Ions ◽  
Aquatic Plants ◽  
Constant Magnetic Field ◽  
Heavy Metal Ions ◽  
Lemna Minor ◽  
Waste Waters ◽  
Higher Aquatic Plants ◽  
Physical Fields

The article is devoted to the problem of increasing the efficiency of purification of natural and waste waters from heavy metal ions by the method of electrochemical phytoremediation. The results of studies on the management of phytoremediation processes by exposure to higher aquatic plants by external physical fields (constant magnetic field, combined exposure to a constant magnetic field and geomagnetic field, constant magnetic field and weak electric (j) fields) are presented. The ef-fect of accelerating the sorption of heavy metal ions under the influence of external physical fields on plants of Lemna minor has been experimentally confirmed. Rational conditions for controlling the processes of selectivity and increasing the rate of electrochemical phytoremediation and the completeness of the extraction of heavy metal ions from contaminated waters using higher aquatic plants are determined. A flow chart of the treatment of wastewater from heavy metals by the phytoremediation method using a biopond / settler populated by higher aquatic plants is proposed.

scholarly journals Waste Water Treatment in Terms of Purification from Copper with Natural and Modified Montmorillonits

2011 ◽  
pp. 58-65
Author(s):  
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Water Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Water Treatment ◽  
Ferrous Metal ◽  
Water Bodies ◽  
Waste Waters ◽  
Sorption Characteristics

Regularity of heavy metal ions isolation from waste waters with modified montmorillonit hydrosoles has been studied. The agents’ sorption characteristics have been investigated. The possibility of heavy non-ferrous metal ions isolation up to the current norms of permissible discharge to water bodies has been demonstrated.

REMOVAL OF HEAVY METAL IONS FROM INDUSTRIAL WASTE WATERS

1982 ◽  
Vol 17 (1-6) ◽  
pp. 219-225 ◽  
Author(s):  
G. KYUCHOUKOV ◽  
D. HADJIEV ◽  
L. BOYADZHIEV
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Industrial Waste ◽  
Heavy Metal Ions ◽  
Waste Waters

Ferrite Process; Heavy Metal Ions Treatment System

1991 ◽  
Vol 23 (10-12) ◽  
pp. 1893-1900 ◽  
Author(s):  
Y. Tamaura ◽  
T. Katsura ◽  
S. Rojarayanont ◽  
T. Yoshida ◽  
H. Abe
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Mine Drainage ◽  
Lattice Points ◽  
Treatment System ◽  
Waste Waters ◽  
Formation Reaction ◽  
Reaction Solution ◽  
Laboratory Waste

The principle of the “Ferrite Process”, heavy metal ions treatment system, and the practically operated systems are presented. In the “Ferrite Process”, the heavy metal ions are incorporated into the lattice points of the ferrites in the course of the formation of the spinel structure by the oxidation of the Fe(II) ions. The ferrite formation reaction proceeds in two paths depending on the reaction pH; 1) the green rust path (pH 7-10), and 2) the γ-FeO(OH) path (pH 10.5-11). The mole ratio of the heavy metal ions incorporated into the lattice points to the Fetotal in the ferrites depends on the reaction pH and the mol ratio of the heavy metal ions in the reaction solution and to the Fe(II) ions added to the reaction solution. Ferrite Process is now practically adopted to the treatment of the laboratory waste waters at the universities and the institutes in Japan, to the treatment of the plating waste waters, and to the treatment of branching mine drainage waters. Since the ferrite sludge has a strong magnetic property, it is reused as a useful magnetic material.

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