نتایج جستجو برای: rare earth elements rees

تعداد نتایج: 590024  

Journal: :Environmental Pollution 2021

In order to better understand the environmental risks of rare earth elements (REEs), it is necessary determine their fate and biological effects under environmentally relevant conditions (e.g. at low concentrations, REE mixtures). Here, unicellular freshwater microalga, Chlamydomonas reinhardtii, was exposed for 2 h one three soluble REEs (Ce, Tm, Y) salts 0.5 ?M or an equimolar mixture these R...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1372

a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...

Journal: :Waste and Biomass Valorization 2021

Ramie plants (Boehmeria nivea) have been cultivated on ion-adsorption rare earth elements (REEs) mine tailings and showed a low ability to accumulate REEs, especially in the stems (ΣREE = 24 ± 17 mg kg−1) with higher concentration leaves roots 57 66 kg−1). individual fibers were isolated using three degumming processes: traditional alkali treatment (AT), steam explosion (SE) after neutral (SEN)...

Journal: :Applied sciences 2021

Spent fluorescent lamps (SFL) are classified as hazardous materials in the European Waste Catalogue, which includes residues from various hi-tech devices. The most common end-of-life treatment of SFL consists recovery rare earth elements phosphor powders, with associated problems management glass residues, usually landfilled. This study involves manufacturing porous ceramics both coarse glass-r...

2014
Julio Navarro Fu Zhao

*Correspondence: Fu Zhao, Division of Environmental and Ecological Engineering, School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907-2088, USA e-mail: [email protected] Rare-earth elements (REEs) are a group of 17 elements with similar chemical properties, including 15 in the lanthanide group, yttrium, and scandium. Due to their unique physical and chemi...

Journal: :Water 2023

Rapid urbanization has caused an increase in the discharge of inorganic elements into environment; however, knowledge about fate and annual variations multiple wastewater treatment plants (WWTPs) is limited. To understand distribution change those elements, we collected analyzed sludge samples from seven WWTPs a southeast city China. Results revealed elemental concentration ranging 0.06 μg·L−1 ...

Journal: :Journal of Ecology & Natural Resources 2018

Journal: :Review of Polarography 1960

Journal: :Metals 2021

With the target of recovering rare earth elements (REEs) from acidic leachates, a new functionalized hydrogel was designed, based on phosphorylation algal/polyethyleneimine beads. The functionalization strongly increased sorption efficiency raw material for Pr(III) and Tm(III). Diverse techniques were used characterizing this correlating performances mechanisms to physicochemical structure sorb...

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