In-Situ Grown Bilayer MOF from Robust Wood Aerogel with Aligned Microchannel Arrays Toward Selective Extraction of Uranium from Seawater

2021 ◽  
Author(s):  
Tao Liu ◽  
Xiaobin Zhang ◽  
Anping Gu ◽  
Yinjiang Liu ◽  
Mengwei Chen ◽  
...  
Keyword(s):  
Selective Extraction ◽  
Microchannel Arrays ◽  
Uranium From Seawater

Superhydrophilic phosphate and amide functionalized magnetic adsorbent: a new combination of anti-biofouling and uranium extraction from seawater

2018 ◽  
Vol 5 (10) ◽  
pp. 2346-2356 ◽  
Author(s):  
Xuejie Guo ◽  
Rongrong Chen ◽  
Qi Liu ◽  
Jingyuan Liu ◽  
Hongsen Zhang ◽  
...  
Keyword(s):  
New Combination ◽  
Magnetic Nanocomposites ◽  
Magnetic Adsorbent ◽  
Uranium Extraction ◽  
Antifouling Property ◽  
Uranium From Seawater

Phosphate and amide functionalized magnetic nanocomposites were successfully preparedvia in situsynthesis for the extraction of uranium from seawater combined with an antifouling property.

Task-specific ionic liquid based in situ dispersive liquid–liquid microextraction for the sequential extraction and determination of chromium species: optimization by experimental design

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60621-60629 ◽  
Author(s):  
Susan Sadeghi ◽  
Ali Zeraatkar Moghaddam
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectrometry ◽  
Selective Extraction ◽  
Chromium Species ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Task Specific Ionic Liquid ◽  
Liquid Microextraction

An optimised task specific ionic liquid-basedin situdispersive liquid–liquid microextraction (in situTSIL-DLLME) with flame atomic absorption spectrometry (FAAS) methodology was developed for the selective extraction of Cr(iii) and Cr(vi) species.

Selective extraction of uranium from seawater with biofouling-resistant polymeric peptide

2021 ◽  
Author(s):  
Yihui Yuan ◽  
Qiuhan Yu ◽  
Meng Cao ◽  
Lijuan Feng ◽  
Shiwei Feng ◽  
...  
Keyword(s):  
Selective Extraction ◽  
Polymeric Peptide ◽  
Uranium From Seawater

scholarly journals The trisulfur radical ion S3•− controls platinum transport by hydrothermal fluids

2021 ◽  
Vol 118 (34) ◽  
pp. e2109768118
Author(s):  
Gleb S. Pokrovski ◽  
Maria A. Kokh ◽  
Elsa Desmaele ◽  
Clément Laskar ◽  
Elena F. Bazarkina ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
High Capacity ◽  
Selective Extraction ◽  
Hydrothermal Fluids ◽  
Thermodynamic Simulations ◽  
Poorly Soluble ◽  
Chloride Sulfate ◽  
Economic Concentration ◽  
Shallow Crust

Platinum group elements (PGE) are considered to be very poorly soluble in aqueous fluids in most natural hydrothermal–magmatic contexts and industrial processes. Here, we combined in situ X-ray absorption spectroscopy and solubility experiments with atomistic and thermodynamic simulations to demonstrate that the trisulfur radical ion S3•− forms very stable and soluble complexes with both PtII and PtIV in sulfur-bearing aqueous solution at elevated temperatures (∼300 °C). These Pt-bearing species enable (re)mobilization, transfer, and focused precipitation of platinum up to 10,000 times more efficiently than any other common inorganic ligand, such as hydroxide, chloride, sulfate, or sulfide. Our results imply a far more important contribution of sulfur-bearing hydrothermal fluids to PGE transfer and accumulation in the Earth’s crust than believed previously. This discovery challenges traditional models of PGE economic concentration from silicate and sulfide melts and provides new possibilities for resource prospecting in hydrothermal shallow crust settings. The exceptionally high capacity of the S3•− ion to bind platinum may also offer new routes for PGE selective extraction from ore and hydrothermal synthesis of noble metal nanomaterials.

In situ remediation of arsenic-rich mine tailings using slag zero valence iron

2020 ◽  
Vol 84 (3) ◽  
pp. 420-434
Author(s):  
Tingting Yue ◽  
Shu Chen ◽  
Jing Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Low Cost ◽  
Selective Extraction ◽  
Hunan Province ◽  
Control Group ◽  
X Ray Diffraction ◽  
Land Occupation ◽  
X Ray

AbstractArsenopyrite (FeAsS) and realgar (As4S4) are two common arsenic minerals that often cause serious environmental issues. Centralised treatment of arsenic-containing tailings can reduce land occupation and save management costs. The current work examined the remediation schemes of tailings from Hunan Province, China, where by different tailings containing arsenopyrite and realgar were blended with exogenous slag zero valence iron (ZVI). Introducing Fe-oxidising bacteria (Acidithiobacillus ferrooxidans) recreates a biologically oxidative environment. All bioleaching experiments were done over three stages, each for 7 days and the solid phase of all tests was characterised by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and selective extraction analyses. The results showed that the mixture group reduced arsenic release by 72.9–74.7% compared with the control group. The addition of 0.2 g ZVI clearly decreased arsenic release, and the addition of 4.0 g ZVI led to the lowest arsenic release among all tests. The decrease of arsenic released from the tailings was due to the adsorption and uptake of arsenic by secondary iron-containing minerals and Fe–As(V) secondary mineralisation. The addition of large amounts of ZVI reduced the arsenic detected in the amorphous Fe precipitates. Therefore, a low cost and integrated strategy to reduce arsenic release from tailings is to mix two typical tailings and apply exogenous slag ZVI, which can apply to the in situ remediation of two kinds or more arsenic-containing tailings.

scholarly journals Prospects for selective-and-advanced recovery of rhenium from pregnant solutions of in-situ leaching of uranium ores at Dobrovolnoye deposit

2021 ◽  
Vol 6 (3) ◽  
pp. 158-169
Author(s):  
A. A. Rudenko ◽  
I. D. Troshkina ◽  
V. V. Danileyko ◽  
O. S. Barabanov ◽  
F. Ya. Vatsura
Keyword(s):  
Uranium Deposit ◽  
English Literature ◽  
Selective Extraction ◽  
Ammonia Solution ◽  
Product Recovery ◽  
Advanced Technology ◽  
Measuring Instruments ◽  
Ammonium Perrhenate ◽  
A Chain

Analysis of exploration materials and market conditions showed that by-product recovery of rhenium, one of the rarest strategic elements of the periodic system, was not always effective in processing the whole volume of pregnant uranium-bearing solutions. The main goal of the research was to develop an effective method for recovery rhenium from pregnant solutions in in-situ uranium leaching. The objectives of the research were as follows: evaluation of the possibility of selective-and-advanced recovery of rhenium from ores by in-situ leaching method and comparison of the technological advantages of the new proposed method with the known ones. The study involved the analysis of historical geological, mineralogical and geochemical information on the Dobrovolnoye deposit and analysis of technological aspects of by-product recovery of rhenium in the world practice. A selective-and-advanced scheme of rhenium recovery from pregnant uranium-bearing sulfate (sulfuric acid) solutions of the Dobrovolnoye deposit ISL (Russia) using mobile installations was proposed. The process has the following features: zoning of production blocks when constructing injection and extraction (pumping) wells; piping of selective extraction wells into a separate collecting pipe; implementation of advanced rhenium sorption. The process implementation makes it possible to obtain rhenium from economically viable areas of the uranium deposit. The mobile installation includes the following main units: a filter for purification (aftertreatment) to remove suspension, a chain of sorption apparatuses (sorption filters or columns), connecting fittings, control and measuring instruments. The sorption apparatuses are filled with rhenium-selective ionite (ion exchanger). As a selective sorbent for the primary concentration of rhenium from sulfate solutions (pH 2), weakly basic nitrogen-bearing ionites containing amine functional groups of various types can be used. If further concentration of rhenium is required, in order to unify the equipment used, materials with a mobile extractant phase (so-called TVEXs (solid extractants or Levextrel resins in English literature) and so-called “impregnated” or “impregnates”), such as TVEX-DIDA containing diisododecyl amine, or TAA-impregnate containing trialkylamine, can be used. Rhenium desorption from these materials is carried out by an ammonia solution, which allows producing rough ammonium perrhenate from the eluate. Economic aspects of the rhenium selective-andadvanced technology were evaluated. Implementation of the recovery selective-and-advanced technology allows obtaining rhenium from economically-viable areas of the uranium deposit.

scholarly journals Conservación in situ y ex situ de las agaváceas y nolináceas mexicanas

2017 ◽  
pp. 27
Author(s):  
Irma Sonia Franco-Martínez
Keyword(s):  
Case Studies ◽  
Ex Situ Conservation ◽  
Selective Extraction ◽  
Ex Situ ◽  
Natural Areas ◽  
Yucca Schidigera ◽  
Risk Of Extinction ◽  
Protected Natural Areas ◽  
Plant Families

The Agavaceae and Nolinaceae, as other plant families, have been affected by the destruction and modification of their habitats and by selective extraction with commercial purposes of some of their species. This has generated that 48 species of Agavaceae and Nolinaceae have been included in the list of Mexican plants in risk of extinction (NOM-059-ECOL-l 994), and two of them (Agave parviflora and Agave victoriae-reginae) are listed in the appendices of CITES. There are 30 Protected Natural Areas that conserve in situ at least one species of the Agavaceae or Nolinaceae. The ex situ conservation is done in 38 Botanical Gardens, 22 of them include in their collections at least one species of these families. There are also eight commercial nurseries that have started the propagation by seed of 12 species, mainly from the genus Agave. Case studies on Agave victoriae-reginae, Beaucarnea recurvata and Yucca schidigera, are also analyzed.

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