Structured hierarchical catalysts were developed for efficient reduction of bromates in water. In the catalysts a small amount of active metal, 0.3 wt.% Pd, is supported onto carbon nanofibres grown either on sintered metal fibres or on a carbon cloth. In both cases high rates of reaction and hi...

Bromate reduction by Fe(0) with incorporation of copper or palladium was investigated in batch tests. The incorporation of copper led to an increase in the rate of bromate reduction, while incorporation of palladium did not show any effect on bromate reduction by Fe(0), regardless of the bimetal...

Bromate formation from the reaction between chlorine and bromide in homogeneous solution is a slow process. The present study investigated metal oxides enhanced bromate formation during chlorination of bromide-containing waters. Selected metal oxides enhanced the decay of hypobromous acid (HOBr)...

Bromate in water has been associated with cancer risks for lifetime exposures, and present technologies for its removal have important drawbacks that create a need for the development of new and more efficient alternatives. Heterogeneous catalysis has been explored for the removal of inorganic p...

This study focuses on bromate (BrO3−) removal from pure aqueous solutions by heterogeneous photocatalysis using a stainless steel Kenics® static mixer (SM) as support for the stabilization of TiO2-P25 thin films. The SM was assembled in a tubular photoreactor coupled to a compound parabolic coll...

The polymetallic Mykonos vein system in the Cyclades, Greece, consists of 15 tension-gashes filled with barite, quartz, pyrite, sphalerite, chalcopyrite and galena in ca. 13.5 Ma, I-type, Mykonos monzogranite. Zones of silica and chlorite–muscovite alteration are associated with the veins and o...

Nanoscale Atomic Force Microscopy (AFM) experiments show that barite (BaSO4) growth is influenced by the pH of the growth solution. AFM observations provide evidence that growth and nucleation rates measured along the [100] crystallographic direction on the initial layer grown on barite (001) na...

Multiple occurrences of bedded barite (BaSO4) are preserved in mudstones of the upper-most Canol Formation (Frasnian) of the Selwyn Basin (Canada). Samples of barite were collected from eight sites (seven measured sections), and examined using petrographic and isotopic techniques (87Sr/86Sr, δ3...

Barite (BaSO4) is a highly stable and widely-distributed mineral found in magmatic, metamorphic, and sedimentary rocks of all ages, as well as in soils, aerosol dust, and extraterrestrial material. Barite can form in a variety of settings in the oceans (hydrothermal deposits, cold seeps, water c...

Solid solution formation between RaSO4 and BaSO4 has long been recognized as a process which potentially controls the Ra concentration in the environment. Here, we have systematically studied the replacement of pure barite by a (Ba,Ra)SO4 solid solution in 0.1 M NaCl through batch experiments ex...

Thermodynamic properties of mixing in the ternary (Ba,Sr,Ra)SO4 solid solution are determined using first principles based total energy calculations and Monte Carlo simulations. Two levels of theory, which correspond to the regular mixing and the generalized Ising model, are considered. The resu...

Solid solution formation between RaSO4 and other isostructural sulfates has been known for a long time as a process potentially controlling Ra concentrations in aquifers. Here, we measured the Ra uptake in the Sr-rich corner of the ternary (Sr,Ba,Ra)SO4 solid solution - aqueous solution (SS-AS) ...

Despite the long history of studies on (Ba,Ra)SO4, various recent investigations aimed at improving our understanding of its formation processes and thermodynamics. Accumulation of natural Ra isotopes (mainly 226Ra and 228Ra) in (Ba,Ra)SO4 plays an important role in many geotechnical application...

The effect of temperature on the solid solution – aqueous solution (SS-AS) equilibria in the (Ba,Sr,Ra)SO4+H2O system is primarily determined by a change in the aqueous solubilities of the end members BaSO4, SrSO4 and RaSO4. The dependence of the solubility vs. the temperature for an MSO4 sulph...

Transition metal-catalyzed polymerizations of 9-ethynyl-9-hydroxyfluorene (EHF) were investigated. EHF was easily polymerized by various transition metal catalysts to give in relatively high yields of polymer. The MoCl5-based catalysts exhibited high catalytic activities, whereas the WCl6-based ...

A series of compounds derived from multifunctional 9-ethynyl-9-fluorenol were synthesized and their structures were characterized by spectroscopic methods. Some derivatives were luminescent with high quantum yields, which might be used as optoelectronic materials based on their optical property ...

The dielectric properties were studied of a completely cyanoethylated derivative (CN-DPMA) of poly(2,3- dihydroxypropyl methacrylate), which was synthesized by radical polymerization of the monomer with protected hydroxyl groups, followed by deprotection. The experimental results were compared w...

Indirubin is a deep-red bis-indole isomer of indigo blue, both of which are biologically active ingredients in Danggui Longhui Wan, an ancient Chinese herbal tea mixture used to treat neoplasia and chronic inflammation and to enhance detoxification of xenobiotics. Multiple indirubin derivatives ...

Poly[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl methacrylate)] [poly(solketal methacrylate) (PSMA)] was synthesized by free radical polymerization. By partial hydrolysis of the acetal group, random copolymers of SMA with 2,3-dihydroxypropyl methacrylate (DHPMA) were synthesized whereas complete clea...

2,3-Dihydroxypropyl chitosan resin, prepared from chitosan and a 1,2-diol, adsorbed only germanium(IV) from aqueous solutions containing semimetals over the range of acidic to weakly basic media. The adsorption capacities of the chitosan resin were up to about 1.4 mmol g−1. The selective separat...