Results 91 to 100 of about 73,997 (288)
MiningArsenic and antimony are impurities that reduce the economic value of concentrates due to the environmental problems they cause. The removal of these impurities by hydrometallurgical means has been highly studied for sulfide copper concentrates using ...
Walter Blanco-Vino +2 more
doaj +1 more source
POM‐Based Water Splitting Catalyst Under Acid Conditions Driven by Its Assembly on Carbon Nanotubes
Advanced Materials, EarlyView.A newly‐engineered POM‐based electrocatalyst incorporating non‐innocent counter cations exhibits fast kinetics for either the OER or HER under strongly acidic conditions (1 m H2SO4), depending on whether it is assembled on carbon nanotubes (1@CNT) or physically mixed with them (1/CNT). In water‐splitting tests using a two‐electrode setup, these systems
Eugenia P. Quirós‐Díez +8 more
wiley +1 more source
Application of alternative lixiviants for secondary heap leaching of gold [PDF]
, 2000 Some preliminary results on the secondary leaching of previously heap leached gold ore are presented. Alternative lixiviants for gold comprising chlorine, thiourea and thiosulphate were compared with cyanide using bottle roll tests.
Nikoloski, A., Stockton, B.
core +1 more source
Natural and simulated aging of historical glasses [PDF]
, 2017 We thoroughly studied coloured glass tesserae of historical glass windows of the Santi Giovanni e Paolo Church in Venice by means of ESEM and XPS techniques in order to evaluate the weathering mechanisms of the glass surfaces.
Bertoncello, Renzo, Elena, Rebollo
core +1 more source
Alkaline leaching of lead and zinc by sodium hydroxide: kinetics modeling
Journal of Materials Research and Technology, 2018 This study was performed in two phases of work. In the first stage, alkaline leaching of lead and zinc from an Iranian low-grade oxide ore was examined and the influence of the operating variables including stirring speed, leaching temperature, NaOH ...
Seyed Mahyar Seyed Ghasemi, Asghar Azizi
doaj +1 more source
Advanced Materials, EarlyView.Incorporating multiple cations (Cu2⁺ and Cr3⁺) into the Mn3O4 spinel lattice strategically tunes the electronic structure, narrowing the bandgap from 2.3 to 1.49 eV. This enhances visible–NIR light absorption and photothermal conversion, enabling a high water evaporation rate of 4.1 kg m−2 h−1 under 1 sun.
Rana Muhammad Irfan +3 more
wiley +1 more source
Tannin resin-boron associations: Leaching and biological resistance [PDF]
, 2012 The easy leaching of boron in wood preservation formulations has allowed to use this fungicide only for short term applications. The recently discovered adduct with flavonoids allows boron to resist longer periods of time within wood and consequently ...
Leménager, Nicolas +5 more
core
Toward Energy Efficient Electrochemical Valorization of Waste Nitrate and Sulfide
Advanced Materials, EarlyView.This work introduces an integrated electrochemical strategy couples nitrate reduction with sulfide oxidation for energy‐efficient wastewater valorization. A Cu‐Co dual‑site catalyst, engineered for close proximity, promotes *NO2 relay and subsequently NH3 formation, enabling the system to operate at substantially reduced cell voltages and produce high ...
Bihao Hu +5 more
wiley +1 more source
Arsenic in Poultry Litter: Organic Regulations [PDF]
, 2005 Most of the arsenic used as an antibiotic in commercial broiler production ends up in the litter. Using this litter as a soil amendment is not prohibited by the National Organic Program, but 7CFR S205.203(c) of the Rule requires that "the producer must ...
Barbara C. Bellows
core
Diverse Cation Exchange in Layered Titanate Nanostructures for Tailored Catalysis
Advanced Materials, EarlyView.H+(H3O+)‐intercalated layered titanate enables stable intercalation of 42 single‐metal and multication combinations. Alkali‐metal intercalation tunes Rh charge density, yielding an efficient propylene hydroformylation catalyst. These results establish a generalizable intercalation platform for rational catalyst design and provide a library supporting ...
Hyoseok Kim +15 more
wiley +1 more source