scholarly journals Modified sorbents based on wooden wastes for the extraction of heavy metal ionsfrom waste waters.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 223-226
Author(s):  
L. A. Shibeka ◽  
◽  
M. V. Protas ◽  
Keyword(s):  
Heavy Metal ◽  
Heavy Metal Ions ◽  
Waste Water Treatment ◽  
Absorption Capacity ◽  
Wood Waste ◽  
Zinc Ions ◽  
Waste Waters ◽  
Treatment Processes ◽  
The Republic ◽  
Modified Sorbents

The paper presents the characteristics of waste generated in the Republic of Belarus. The results of the research on the use of sorbents based on wood waste in waste water treatment processes from copper, nickel and zinc ions are presented. It has been established that treatment of wood waste with carbamide increases its absorption capacity in respect of heavy metal ions.

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.

Research Progress in Removing Heavy Metals from Waste Water via Bio-Sorption

2014 ◽  
Vol 587-589 ◽  
pp. 692-695
Author(s):  
Wei Sun
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Water Treatment ◽  
Research Progress ◽  
Traditional Methods ◽  
Sorption Method

Bio-absorption has an unparalleled advantage over other traditional methods in removing and recycling heavy metal ions from waste water. Consequently, it has a promising future. In this paper, the traditional methods and the bio-sorption method via which heavy metals are removed from waste water are compared to summarize the mechanism of bio-sorption, the types of bio-sorbent, the factors that can influence bio-sorption and the state of its application in waste water treatment .

Gram-scale synthesis of monodisperse sulfonated polystyrene nanospheres for rapid and efficient sequestration of heavy metal ions

2017 ◽  
Vol 53 (95) ◽  
pp. 12766-12769 ◽  
Author(s):  
Bin Gong ◽  
Yaotian Peng ◽  
Ziyan Pan ◽  
Weiming Chen ◽  
Yi Shen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Large Scale ◽  
Zinc Ions ◽  
Sulfonated Polystyrene ◽  
Copper And Zinc ◽  
Polystyrene Nanospheres

Large-scale monodisperse sulfonated polystyrene nanospheres are synthesized for the removal of lead, copper and zinc ions from aqueous solutions.

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 Research of efficiency of natural and modified sorbents for purification of industrial sewage from heavy metal ions

2019 ◽  
Vol 10 (5) ◽  
pp. 125-143
Author(s):  
A.M. Nazarov ◽  
F.M. Latypova ◽  
L.Kh. Araslanova ◽  
E.R. Sal’manova ◽  
I.O. Tuktarova
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Industrial Sewage ◽  
Modified Sorbents

Effect of metal ions on pea alcohol dehydrogenase

1979 ◽  
Vol 44 (3) ◽  
pp. 799-803 ◽  
Author(s):  
Sylva Leblová ◽  
Noemi Nováková ◽  
Marie Stiborová
Keyword(s):  
Heavy Metal ◽  
Alcohol Dehydrogenase ◽  
Metal Ions ◽  
Mechanism Of Action ◽  
Heavy Metal Ions ◽  
Inhibitory Effect ◽  
Zinc Ions ◽  
Pea Seeds

The effect of Cu2+, Ag+, Zn2+, Cd2+ and Co2+ on alcohol dehydrogenase (ADH) isolated from germinating pea seeds was examined. The enzyme is inhibited approximately to the same degree if incubated 5 to 30 min with Ag+, Cu2+, and Cd2+; the same degree of inhibition can be brought about by zinc ions only if concentration by one order higher (10-4M) is used. Co2+-ions do not inhibit pea alcohol dehydrogenase even at 10-3M concentration. NAD and Zn2+ decrease the inhibitory effect of Cd2+ yet not the effect of Cu2+ or Ag+. The differences in the mechanism of action of individual heavy metal ions on plant ADH are discussed.

scholarly journals Production of activated carbon from poultry feathers for waste water treatment

2019 ◽  
Vol 80 (8) ◽  
pp. 1407-1412 ◽  
Author(s):  
Rue Chiramba ◽  
Gratitude Charis ◽  
Nonhlanhla Fungura ◽  
Gwiranai Danha ◽  
Tirivaviri Mamvura
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Activated Carbon ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Waste Water Treatment ◽  
Limiting Factors ◽  
Poultry Feathers

Abstract Contamination of water bodies by heavy metal ions is a challenge many developing nations like Zimbabwe face, with negative environmental and socio-economic repercussions. Treating affected bodies usually requires a costly consignment of chemicals and activated carbon. This research investigates the possible use of an abundant waste resource – poultry feathers – to make activated carbon for heavy metal ion removal. Poultry consumption in this nation generates more than five million tonnes of feathers a year, with very few uses of this by-product. This research was carried out to evaluate the effectiveness of activated carbon synthesized from poultry feathers with sodium hydroxide as the activating agent. It was tested for removing heavy metal ions from waste water at Lake Chivero and the experimental work done showed that it had a removal efficiency as high as 97%, with a high affinity for lead ions as compared with chromium ions. Upon characterization, the activated carbon showed an iodine number of 520 mg and it worked best at a pH value of 8. The efficiency removal also increased with increasing adsorbent concentration as well as contact time up to a period where these factors ceased to be the limiting factors of the reaction.

scholarly journals Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 800-819 ◽  
Author(s):  
Zhen Tang ◽  
Zedong Qiu ◽  
Shuang Lu ◽  
Xianming Shi
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Absorption Capacity ◽  
Hydroxyl Group ◽  
Synthesis Methods ◽  
Structural Components ◽  
Double Hydroxide

AbstractThe use of functional material can help mitigate the pollution by heavy metals, which presents an array of risks to human production and life. This work provides a comprehensive review of the current knowledge on functionalized layered double hydroxide (LDH) as a heavy metal absorption material, by synthesizing the information from a total of 141 relevant publications published since 2005. LDH provides a potentially highly efficient method to adsorb heavy metal ions, which is simple to prepare and of low cost. The lack of functional groups and structural components of pristine LDH, however, limits the absorption capacity and widespread applications of LDH. Through intercalation, surface modification, or loading on substrates, functional groups or structural components are introduced into the pristine LDH to prepare functionalized LDH. In this process, the hydroxyl group and the valence state of [Mg(OH)6] octahedrons play a crucial role. Functionalized LDH can be endowed with selective absorption capacity and enhanced stability and recyclability. After adsorbing heavy metal ions, functionalized LDH can be readily separated from the liquid phase. These aspects are discussed, along with the structure and composition, shape and size, and synthesis methods and research tools of LDH. This work concludes with the discussion of preparation and utilization and a look to the future in terms of identified research needs regarding the preparation, use, and recycling (or upcycling) of economical and environmental-friendly LDH.

Prospects for the Production and Application of New Zeolite-Like Sorption Materials for Waste Water Treatment in Railway Enterprises

2020 ◽  
Vol 24 (6) ◽  
pp. 4-9
Author(s):  
М.V. Obuzdina ◽  
E.A. Rush
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Raw Materials ◽  
Waste Water Treatment ◽  
Polymer Network ◽  
Waste Products ◽  
Main Component ◽  
Sulfur Containing

The article presents the results of researches of zeolite modification in order to create sorbents for wastewater treatment from heavy metal ions. Zeolitive tuffs of deposit of the Zabaikalye Territory are considered as raw materials. It is proposed to modify zeolites with highly organosilicon compounds hexamethyldisilazane [(CH3)3Si]2NH and tetraethoxysilane (С2H5O)4Si, which leads to hydrophobization of the surface and an increase in adsorption capacity. A method for modifying the structure of natural zeolite with a sulfur-containing polymer obtained from waste products of epichlorohydrin, the main component of which is 1,2,3-trichloropropane, is described in more detail. A sulfur-containing polymer network is formed by using sulfur dissolution at room temperature in the monoethanolamine – hydrazine hydrate system and condensation with 1,2,3-trichloropropane. The result of applying a sulfur-containing polymer network is not only hydrophobization of the zeolite surface, but also the appearance of sulfur atoms in its composition, which increases the selectivity to heavy metal ions. Based on the obtained experimental data, the method of improvement the existing technologies for wastewater treatment at enterprises (railway transport) by introducing a deep post-treatment into the sorption unit scheme is proposed.

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