scholarly journals On the Spatial Dimension of the Circular Economy

Resources ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 32 ◽  
Author(s):  
T. Graedel ◽  
Barbara Reck ◽  
Luca Ciacci ◽  
Fabrizio Passarini
Keyword(s):  
Circular Economy ◽  
Spatial Dimension ◽  
Metal Extraction ◽  
Extraction Capacity ◽  
Resource Network ◽  
Carbon Neutrality ◽  
Nickel Copper ◽  
Product Manufacturing ◽  
Copper Zinc ◽  
Conservation Of Natural Resources

The concept of a “circular economy”, in which material in society is regarded as “a transient phase in anthropogenic resource utilization”, is a growing topic for discussion. The primary motivations for supporting a circular economy include a reduction of environmental impacts and conservation of natural resources. Australia is a vivid example of a country whose large metal extraction capacity is not balanced as it has neither an extensive product manufacturing capability nor a large domestic market. Consequently, Australia must rely on the global resource network to achieve circularity and carbon neutrality. This work illustrates this situation with quantitative material flow cycles for Australian aluminum, nickel, copper, zinc, and stainless steel, and comments on the implications of the results for Australia and for circular economy prospects more generally.

A Comparative Study on the Capability of Tree Species in Urban Afforestation to Accumulate Heavy Metals

2021 ◽  
Vol 9 (1) ◽  
pp. 79-90
Author(s):  
Samar Mortazavi ◽  
◽  
Masoud Hatamimanesh ◽  
Farzad Veysanlou ◽  
◽  
...  
Keyword(s):  
Heavy Metals ◽  
Tree Species ◽  
Metal Accumulation ◽  
Climatic Conditions ◽  
Heavy Metal Accumulation ◽  
Toxicity Potential ◽  
Nickel Copper ◽  
Accumulation Index ◽  
Copper Zinc ◽  
Lead Nickel

Background: The present study investigated the concentrations of lead, nickel, copper, zinc, their toxicity potential, and their ecological hazard in surface soils of Hamedan City, Iran. Also, using the Bio-concentration Factor (BCF), concentration Comprehensive Bio-concentration Index (CBCI), and Metal Accumulation Index (MAI), was evaluated the ability of some tree and shrub species to absorb heavy metals in soil and air. Methods: Sampling of leaves of nine tree species and shrubs (plane, acacia, elm, willow, mulberry, ash, redbud, pine, and cypress) was performed in six stations. After preparation and acid digestion of the samples, the concentrations of heavy metals were determined using an atomic absorption spectrometer. Results: The trend of changes in soil heavy Mean±SD metal concentrations was in the order of nickel> zinc> copper> lead in the amounts of 61.41±11.34˃ 43.04±14.4˃ 42.87±8.36˃ 18.77±6.51 mg/kg. Evaluation of acute toxicity potential indicators and ecological risk of heavy metals indicated low soil pollution status. Findings of BCF, CBCI, and MAI ndices in the leaves of the species showed that the highest levels of BCF of heavy metals, i.e., zinc, copper, lead, and nickel, were in willow, elm, cypress, and pine species, respectively. Results show that heavy metal accumulation in different species. Conclusion: Depends on soil type, tree species, climatic conditions, type of pollutant source, species age, and other factors. In this study, elm and acacia have the highest ability to absorb heavy metals from soil and air.

Varistor and Magnetic Properties of Nickel Copper Zinc Niobium Ferrite Doped with Bi2 O3

2014 ◽  
Vol 97 (12) ◽  
pp. 3918-3925 ◽  
Author(s):  
Li-Then Mei ◽  
Hsing-I Hsiang ◽  
Wei-Hung Hsu
Keyword(s):  
Magnetic Properties ◽  
Nickel Copper ◽  
Copper Zinc

BRAIN BioXtractor: Biobased Metal Extraction for the Circular Economy

2018 ◽  
Vol 14 (2) ◽  
pp. 68-73
Author(s):  
Esther M. Gabor ◽  
Benedikt Hoffmann ◽  
Thomas Deichmann
Keyword(s):  
Circular Economy ◽  
Metal Extraction

The Distribution of Nickel, Copper, Zinc, and Iron in Tree Leaves

1973 ◽  
Vol 24 (5) ◽  
pp. 889-895 ◽  
Author(s):  
M. H. TIMPERLEY ◽  
R. R. BROOKS ◽  
P. J. PETERSON
Keyword(s):  
Tree Leaves ◽  
Nickel Copper ◽  
Copper Zinc

scholarly journals Sorption properties of modifiers of piezoquartz resonators based on 3d-elements

2019 ◽  
Vol 81 (2) ◽  
pp. 268-272
Author(s):  
A. V. Nikulina ◽  
T. A. Kuchmenko
Keyword(s):  
Transition Metals ◽  
Film Formation ◽  
Kinetic Curve ◽  
Diethyl Amine ◽  
Frequency Drop ◽  
Nickel Copper ◽  
3D Elements ◽  
Tert Butylamine ◽  
Copper Zinc ◽  
Sorption Characteristics

Transition metals are complexing substances, that is why being incorporated into the sensor modifiers, they can improve detection discrimination. The method of piezoelectric microweighting was used to study the sorption characteristics of the films based on partially soluble phosphates of 3d-elements (manganese (II), iron (II and III), nickel, copper, zinc, chromium) and coatings bearing partially soluble ferrous salts (hydrated oxide, fluoride, carbonate, sulfide, phosphate). The salts were created immediately prior to analysis, with bee glue as a filming agent. The method of immersion sensors in suspension of the filming agent and partially soluble salt, that was kept homogeneous by ultrasonic bath, was recognized the best way of film formation. Sorption characteristics of the composed coatings of piezoelectric resonator were estimated by the area under sorption kinetic curve and by peak value of sensor oscillation frequency drop during analysis of equilibrium gaseous form received over pure substances (water, phenol, isopropanol, isobutanol, acetous acid, chloroform, benzene, toluene, acetone, ethyl acetate, ammonia, diethyl amine, triethylamine, tert-butylamine, benzylamine). It was possible to determine the identifying variables Aij, minimax values of those allow to detect individual substances in the mixed vapour. Modifier application of piezoelectric resonators of phosphates of different 3d-elements is more efficient than use of different salts of one element. The shortcoming of the proposed modifiers is temporarily stable amine (ammonia) complexation. Those analytes desorption from the films proceeds slowly, it is determined by the bond strength of complexes and takes from 2 to 6 hours. However, array of seven sensors, modified by phosphates of transition metals of group IV, allows to detect oxygen- and nitrogen-based compounds vapours in the mixed vapour as well as to detect ammonia, diethyl amine and triethylamine individually.)

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