Affiliation 1 Dipartimento di Biologia e Chimica Agro-forestale ed Ambientale, Via Amendola 165/A, 1-70126, University of Bari, Bari, Italy. [email protected]

Global Cu-Pb-Zn resources are abundant, and the global Cu, Pb, and Zn reserves an- nounced by the United States Geological Survey (USGS) are 2.1 × 10 9 t, 2 × 10 9 t, and 1.9 ×

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The 7xxx (Al-Zn-Mg-Cu) alloys were extensively utilised in aerospace and rail transit due to their low density, high strength, and excellent processability. Nevertheless, an increase in strength inevitably comes at the expense of ductility, and vice versa, which was known as the "strength-ductility trade-off" dilemma. Extensive research had been conducted to …

In another study by Visa [7] for the simultaneous adsorption of Cd(II), Ni(II), Cu(II), Zn(II), and Pb(II) on zeolites from coal fly ash, with NaP1 as the major composition, the maximum adsorption capacity was found to be 26.9 mg/L for Cd(II ... D. Oh, K. Kim. A study on removal characteristics of heavy metals from aqueous solution by fly ash ...

The ligand (L) was reacted with metal ions Pb(II), Cd(II), Zn(II) and Cu(II) to form complexes with different properties. The metal complexes have been successfully synthesized in an alcoholic medium.

Remediation of Cd-, Pb-, Cu-, and Zn-contaminated soil using cow bone meal and oyster shell meal. Author links open overlay panel Xiongkai Zheng a b, Mengyao Zou a b, Bowen Zhang e, ... X = F, Cl, OH) to reduce the activity of Pb (Cao et al., 2004, Ryan et al., 2001, Xu et al., 1994). However, the impacts of BM and OS meal or their mixtures (BO ...

The system achieved preconcentration yields ranging between 44.11% (Cd) and 77.77% (Cu) after nine hours of operation, the effectiveness of metal transport being Cu > Zn > Pb > Mn > Ni > Al > Cd.

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Methods: The blood levels of lead (Pb), cadmium (Cd), mercury (Hg), selenium (Se), copper (Cu) and zinc (Zn) and the results of the cognitive function tests were extracted from 811 elderly ...

The LOD's for trace metals, estimated based on short-term analyses, varied from 0.096 pmol kg −1 for Pb to 0.151 nmol kg −1 for Zn during online preconcentration, and from 0.221 pmol kg −1 for Pb to 0.024 nmol kg −1 for Zn during offline preconcentration.

intermedia TSBOI remediation of Cu was microspherical, and the main forms of existence were Cu 2 (OH) 2 CO 3 and Cu 2 (OH) 3 Cl. The mineralization product generated by B . intermedia TSBOI-mediated Pb, identified as PbCO 3 by XRD comparison ( Gomaa, 2019 ; Kang et al., 2015 ), was irregularly size, which may be related to the fact that the ...

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The results demonstrate that the ore consists of 35 categories of minerals, assaying Cu 7.99%, Pb 9.39%, and Zn 1.96% in the forms of chalcopyrite, galena, and sphalerite, respectively, and silver assaying 157.9 g/t …

Song et al. (2023) studied the metal sources of the Zhugongtang Zn-Pb deposit in northwestern Guizhou province, South China. The results suggest that sphalerite is the main Cd-bearing mineral and Cd was most likely incorporated into sphalerite via (Fe 2+, Cd 2+) ↔ Zn 2+ substitution. The different Cd isotopes and Zn/Cd ratios support a mixing model for the metal …

Sulfur and chlorine are the two most important ligands accounting for metal transport in the upper crust. In this study, four metal- and sulfur-saturated model fluids with varying salinities and redox states were simulated in the Fe-Cu-Pb-Zn-Au-S-C-H-O system, over a wide pressure-temperature (P-T) range (50–650 °C, 0.8–5.0 kbar), in order to compare the …

The adsorption of metals onto Fe oxides, hydroxides and oxyhydroxides (hereafter denoted as Fe oxides for simplicity) is an important process that can influence metal mobility and bioavailability in soils and aqueous environments, and which has been studied for more than forty years (Raogadde and Laitinen 1974).Due to the development of advanced analytical …

The analysis of Cd, Cu, Pb, and Zn were performed by ICP-OES (Varian, 710-ES) in μg/kg. To control the accuracy of the experiment, a multi-element standard solution (Merck) with different concentrations of Cd, Cu, Pb and Zn (0.2, 1, 10, 50, 100 and …

The influence of temperature, process time and the S:L (solid/liquid) ratio on the selective extraction of Pb, Zn, Cu and As into targeted products under leaching conditions is studied. The results of the test work show that with the optimal process parameters of S:L = 1.5, t = 60 °C, τ = 60 min, the extraction of copper and zinc into ...

To sum up the behavior of metal hydroxides in alkaline solutions, the molar solubilities of metal hydroxides in 6 and 8 M NaOH (Fig. 3) decreased in the following order which will be called reactivity toward alkali (RTA) trend: Zn(OH) 2 > Cu(OH) 2 > Pb(OH) 2 > Cd(OH) 2.

Recently, heavy metal contaminated soil has been widespread concerned. Herein, rice straw-derived biochar-supported nanoscale zero-valent iron (nZVI@BC) composite was prepared and characterized, and its remediation performance in Cu, Zn, As, Cd, and Pb contaminated soil were evaluated. nZVI@BC demonstrated better immobilization effect on …

Our selection of metal products is among the most extensive in the industry today, with an inventory that includes a large range of copper and copper alloys.

The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate …

Due to the rapid development of industrial and agricultural activities, heavy metals have been widely detected in the soil (Liu et al., 2020b).Owing to the persistence, high toxicity, and non-biodegradability, heavy metal contaminated soil has been considered as an increasingly severe environmental problem (Liu et al., 2018b).Cd, Pb, Hg, As, Cr, Ni, Cu, and Zn have been …

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Screening of Cu-Mn-Ni-Zn high-entropy alloy catalysts for CO 2 reduction reaction by machine-learning-accelerated density functional theory. ... The screening results provided the catalysts for CO 2 reduction to CH 3 OH including Cu 0.8 Ni 0.1 Zn 0.1, Cu 0.8 Co 0.1 Zn 0.1, Cu 0.7 Ni 0.2 Zn 0.1, ...

A standard with Cu, Pb, or Zn sorbed to ferrihydrite was used to represent Cu/Pb/Zn bound to the iron mineral, whereas Cu, Zn, and Pb bound to Pseudomonas putida biomass was used to represent the proportion of Cu/Pb/Zn sorbed to the biomass within the BIOS (Supplementary Materials Table S3). All reported fits are normalized to , with the ...

These metal resources include Pb, Zn, Cd and Cu. Pb–Zn mine is of dominating mines in Yunnan Province. The total reserves of Pb–Zn mines are 26.053 million tons in Yunnan Province (Bai et al., 1985). On the other hand, plant species was diverse in metal mining area, including tree, bush and herbaceous. Because of interspecific difference in ...

For floating Pb-Cu sulfides and depressing Zn sulfides, in a one-stage rougher, the reagent regime and dosages were set as the plant operation was recommended (pH 10.5 adjustment with NaOH, ZnSO 4 2000 g/t, Dextrin 200 g/t, Potassium amyl xanthate 35 g/t, and 2 drops of MIBC 15 g/t. For the case of nanobubbles generated with frother, 1 drop was ...