The burning characteristics of solid propellants contain ammonium perchlorate (AP) as oxidizer can be modified by the addition of burn rate modifiers (BRM). Herein, we report the synthesis of a new class of BRM based on nano copper oxide (CuO) dispersed on alumina by a sol–gel method. The optim...

Two single crystals of 1-(diaminomethylene) thiouron-1-ium benzoate (1) and bis(1-(diaminomethylene)thiouron-1-ium) phthalate trihydrate (2) were grown using a solution growth technique. The compound 1 crystallises in the centrosymmetric P21/c space group of the monoclinic system, whereas the co...

This work presents the syntheses, crystal structures, lone pair functionality and electrospray ionization spectra in positive mode (ESI-MS positive) of two trinuclear CuIIPbIICuII compounds [(CuIIL1)2PbII(ClO4)2] (1) and [(CuIIL2)2PbII(NO3)2] (2), one dimer of trinuclear (CuIIPbIICuII)2 compound...

Lead speciation in many aqueous geochemical systems is dominated by carbonate complexation. However, direct observations of Pb2+ complexation by carbonate ions are few in number. This work represents the first investigation of the equilibrium Pb2++CO32-⇌PbCO30 over a range of ionic strength. Thr...

The preparation, characterisation and thermal decomposition of the new material tin(II) perchlorate trihydrate is described. Its infra-red spectrum and Mössbauer parameters are reported and compared with the data for other metal perchlorates and tin(II) compounds.

The crystals of cyclic oxaalkyl diamide of o-phthalic acid (CPhDA) and its complex with lead(II) perchlorate (CPhDA–Pb(ClO4)2–H2O (6:2:3)) were obtained from acetonitrile and were studied using X-ray crystallography and FT-IR spectroscopy. CPhDA crystallises in the centrosymmetric space group ...

The ability of pyridyldithiafulvenes to react as monodentate ligand with Mo(CO)6 and Pb(ClO4)2 has been investigated. The corresponding molybdenum carbonyl complexes have been isolated while no coordination to lead has been observed. As evidenced by X-ray crystal structure analysis, protonation ...

Global environmental problems allied with waste management require novel approaches for the simultaneous removal of heavy metals and other associated compounds including cyanate. In this study, iron-oxide filled multi-walled carbon nanotubes (m-MWCNTs) were successfully synthesized and character...

The protonation equilibria of cytidine 5′-monophosphate (CMP) and its complex formation with Tl(I) ion were studied over a wide pH range (1.5 to 10.5), using a combination of spectrophotometric and potentiometric methods at constant temperature (25 °C), different methanol–water mixtures (0 to...

Thermal decomposition of an intimate mixture of thallium(I) perchlorate and chromium(III) oxide revealed that chromium(III) oxide lowers the decomposition temperature of thallium(I) perchlorate and is oxidized into hexavalent state to give thallium(I) dichromate. The thermal decomposition was fo...

On treatment with thallium (III) nitrate, trihydrate in acetonitrile solution, 3,4,6-tri-O-benzyl-D-glugal (5) gives the ring-contracted aldehyde (6) which has been converted into the showdemycin analogue (8); 2-(α-D-2′-deoxyribofuranosyl)maleimide (12) has similarly been prepared from (10) in...

The anodic activity of gold in aqueous cyanide may be inhibited at potentials just positive of the reversible potential by the formation of passivating species. In this work the mechanisms proposed for the passivation of the gold, as well as its activation by metals such as lead, bismuth and tha...

Mining and metallurgy generate residues that may contain thallium (Tl), a highly toxic metal, for which it is currently not feasible to determine its geochemical speciation through X-ray absorption spectroscopy due to a combination of very low contents and the interference of accompanying high a...

The heterogeneous kinetics of gold cyanidation in the presence of a thallium(I) salt, which is known to act as accelerator of the reaction, are described in this paper. The rate of gold dissolution in the conventional gold cyanidation decreases dramatically at pH values higher than 11.5. The pre...

The use of potassium persulfate as oxidant in gold cyanidation is proposed at pH values between 10 and 11. The addition of thallium (I) ions enables high cyanidation rates to be maintained at pH values higher than 11, as it acts as a catalyst of the process. When gold cyanidation is performed in...

The abandoned mining area of Valdicastello Carducci (Tuscany, Italy) is characterized by the massive presence of thallium in the acid mine drainages and in the valley stream crossing the region. We previously found that Tl(III), generally considered the less stable oxidation state of thallium, i...

The benzylation of benzene by benzyl chloride over a series of Thallium-containing mesoporous silicas with different Tl contents has been investigated. These materials (Tl-HMS-n) have been characterized by chemical analysis, N2 adsorption/desorption isotherm and X-ray diffraction (XRD). The meso...

Thallium has been shown to significantly increase in both water and aquatic biota after exposure to metal mine effluent, however, there is a lack of knowledge as to its fate and effect in the aquatic environment. The objectives of this project were to assess (1) fate of thallium by conducting sp...

Simultaneous removal of thallium (Tl) and chloride from a highly saline industrial wastewater was investigated using modified anion ion exchange resins. The removal of thallium was mainly driven by the exchange of Tl-chlorocomplex (TlCl4−) formed in the oxidation of thallous (Tl (I)) to thallic ...

Thallium (Tl) was released into the environment through growing human activities, and removing trace Tl from polluted source water is a severe challenge. This work demonstrated that by combining K2FeO4 pre-oxidation with poly aluminum chloride (PAC) coagulation, removal efficiency of trace Tl [i...