The downstream processing of leachates arising from the dissolution of copper bearing gold ores in cyanide-starved alkaline glycine solutions is imperative for the successful implementation of the new leach system at industry level. This study investigates the behaviour of gold adsorption onto a...

A vacuum vessel which is the first confinement barrier of Tokamak fusion reactor should have numerous in-vessel components. Since those components are to be exposed to the plasma under ultrahigh vacuum condition and should be maintained during Tokamak operation, a threaded connection of vacuum v...

Cyanide-starved alkaline glycine solutions have been shown to have distinct advantages in terms of lower reagent consumption and detoxification needs, or leach rate and recovery, over cyanide- only and glycine-only leach systems respectively for gold ores with nuisance copper. Activated carbon h...

Recently, a novel leach process for treating gold-copper ores and concentrates by glycine in the presence of starved cyanide in solutions were investigated where the Cu species are present as cuprous cyanide and cupric glycinate. Often Cu-levels in these gold ores are insufficient to economicall...

The preparation of a series of ferrocenyl nitrogen donor ligands including ferrocenylpyridines, ferrocenylphenylpyridines and 1,1′-di(2-pyridyl)ferrocene is described. Coordination studies of the substituted pyridines (L) were carried out with platinum, palladium, rhodium and iridium. This resu...

Two ethylene-nickel(0) complexes, viz., [1,2-bis(diphenylphosphino)ethane]-(ethylene)nickel(0) and bis(triphenylphosphine)(ethylene)nickel(0) have been used in a comparison of their catalytic activities in hydrosilylation reactions with those of the corresponding nickel(II) complexes, viz., dich...

In this paper some aspects of the liquid-phase oxidation of ethylbenzene with air catalysed by Ni2+ complexes have been studied; the use of a nickel soluble complex without acetylacetone ligands gave unsatisfactory results. Quaternary ammonium salts (R4NBF4) (R=n-Bu, Me) were used as co-catalyst...

The syntheses of ten new Ni(II) complexes 5a–5j with H2L tridentate (ONO) Schiff-base ligand (2-((2-oxybenzylidene)amino)phenolate) have been described and fully characterized by means of elemental analysis, FT–IR, electronic, 1H NMR and 13C NMR spectroscopy and single-crystal X-ray diffractio...

Novel heteroscorpionate ligands were synthesized by a Peterson rearrangement during the reaction of 2-pyridinecarboxaldehyde (or 2-quinolinecarboxaldehyde) and 1,1-carbonyl-bis(pyrazoles). Nickel(II) dibromide reacts with these ligands in THF to give the heteroscorpionate dibromo complexes of ge...

Equimolar reactions of furan-2-formaldehyde-N1-phenylthiosemicarbazone [(C4H3O)(H)C2N3-N2(H)-C1(S)-N1HPh; HftscN-Ph)] and furan-2-acetaldehyde-N1-phenylthiosemicarbazone; [(C4H3O)(CH3)C2N3-N2(H)-C1(S)-N1HPh, HaftscN-Ph] with Cu(OAc)(PPh3)2 in methanol has yielded N,S-chelated CuI complexes, [Cu(...

Four nickel(II) complexes of general formula [Ni(RSO2NCS2) (PPh3)2] where R = CH3 (2a), CH3CH2 (2b), CH3(CH2)3 (2c) and CH3(CH2)7 (2d) and PPh3 = triphenylphosphine; and two nickel(II) complexes of general formula [Ni(RSO2NCS2)dppe] where R = CH3(CH2)3 (3c) and CH3(CH2)7 (3d) and dppe = 1,2-bis(...

In this study, ammonium N-benzyldithiocarbamate was synthesized and used to prepare homoleptic Ni(II) bis(N-benzyldithiocarbamate) (1) and heteroleptic Ni(II) complexes involving isocyanate (2) and cyanide (3) ions. The complexes were characterized by elemental analysis, Fourier transform infra-...

Nickel(II) complexes of general formula [Ni(RSO2N = CS2)(PPh3)2] (2a–h) or [Ni(RSO2N = CS2)dppe] (3a–h), where R = methyl (a), ethyl (b), butyl (c), octyl (d), phenyl (e), 4-isopropylphenyl (f), 4-tert-butylphenyl (g), 2-naphthyl (h), PPh3 = triphenylphosphine and dppe = 1,2-bis(diphenylphosph...

New bis(N-benzyl-N-substituted benzyldithiocarbamato-S,S′)nickel(II) (1–3) and (N-benzyl-N-substituted benzyldithiocarbamato-S,S′)(isothiocyanato-N)- (triphenylphosphane)nickel(II) (4–6) [where substituted benzyl = 2-HOC6H4CH2 (1,4), 3-HOC6H4CH2 (2,5), 4-FC6H4CH2 (3,6)] were synthesized and ...

SummarySoil salinity is destroying arable land and is considered to be one of the major threats to global food security in the 21st century. Therefore, the ability of naturally salt-tolerant halophyte plants to sequester large quantities of salt in external structures, such as epidermal bladder ...

Biochar made by slow pyrolysis of a fallen leaf of Magnolia Grandiflora L. was prepared for hazardous methylene blue adsorption. The maximum adsorption capacity could reach 101.27 mg/g at 303 K, pH = 12, and 0.1 M ionic strength (NaCl). The elevated pH and ionic strength could increase the adsor...

The discovery of large oil accumulations in the rift and sag Pre-Salt sections of the Campos and Santos Basins has revived interest in the exploration of the lacustrine carbonate reservoirs in the Brazilian and African marginal basins. More than half of Brazilian oil production originates from t...

Water and lipid changes play important roles for the quality formation of salted duck eggs. In the present study, low-field nuclear magnetic resonance (LF-NMR) and magnetic resonance imaging (MRI) were introduced to monitor water and lipid dynamics of duck egg during salting as nondestructive me...

The fabrication of hybrid materials, such as SnO2-C, applicable in advanced energy storage systems, often suffers from lack of simplicity, scalability, cost effectiveness and/or sustainability. Therefore, the development of simpler and more efficient technologies for the sustainable production o...

Developing nanocarriers that accumulate in targeted organs and are harmlessly eliminated still remains a big challenge. Nanoparticles (NP) biodistribution is governed by their size, composition, surface charge and coverage. The current thinking in bionanotechnology is that renal clearance is lim...