Wrocław University of Technology

About: Wrocław University of Technology is a education organization based out in Wrocław, Poland. It is known for research contribution in the topics: Laser & Fuzzy logic. The organization has 13115 authors who have published 31279 publications receiving 338694 citations.

Three-Dimensional Perovskite Methylhydrazinium Lead Chloride with Two Polar Phases and Unusual Second-Harmonic Generation Bistability above Room Temperature

Abstract: Formation of noncentrosymmetric three-dimensional (3D) lead halide perovskites has been a widely sought after goal because the polar structure opens up new vistas to properties of these materials, ...

Development of direct-current, atmospheric-pressure, glow discharges generated in contact with flowing electrolyte solutions for elemental analysis by optical emission spectrometry

Abstract: Direct-current, atmospheric-pressure, glow discharge (dc-APGD) generated in contact with flowing sample solutions is a new, very promising excitation source for analytical optical emission spectrometry, due to its low maintenance requirements and its analytical performance. Since analyzed solutions act as liquid cathodes, this discharge system is useful for the direct determination of elements dissolved in solutions without having to produce their aerosols by pneumatic nebulization. The review presents different systems and designs of dc-APGD generated with the liquid cathode applied to spectrochemical analysis in the past 20 years. We discuss the effect of experimental conditions on analytical response and performance of the discharge. We include analytical figures of merit obtained with different discharge systems and their application to the analysis of environmental and biological samples containing various trace elements.

Adsorption of Ni(II) on spent coffee and coffee husk based activated carbon

Abstract: Adsorption of Ni(II) on low cost activated carbon (AC) from spent coffee (SAC) and coffee husk (HAC) has been studied. Porous textures of adsorbents were characterized by N2 and CO2 sorption measurements. Batch adsorption experiments were performed as a function of adsorbent dose, Ni(II)-concentration and pH. Adsorption of Ni(II) was evaluated using different adsorption isotherm models (Langmuir, Freundlich, Monolayer Model for Single-Compound Adsorption and Dubinin – Radushkevich) and thermodynamics and kinetics parameters were determined. Both adsorbents show high affinity for Ni(II), however both the surface area and the pore size of the ACs do not seem to be the determining factor in the adsorption process. These ACs are microporous in nature. In contrast, the higher oxygen amount associated to the mineral matter as K2O and carbon functionalities corresponding with O H in HAC are determining for the Ni-ion adsorption process and multi-ion anchorage mechanism. In addition, the exchange of potassium present in the ACs improves the Ni(II) adsorption process. Thermodynamics and kinetics evidence a fast and endothermic adsorption process. The maximum adsorption capacity using the Langmuir isotherm model was found to be 57.14 mg/g and 51.91 mg/g for HAC and SAC, respectively. The sorption efficiency was higher for HAC as adsorbent. At low concentrations of Ni(II) (30 mg/L) and higher temperatures (308–328 K), removals >94% were measured for HAC, achieving safe discharge concentration values.

Organophosphonate utilization by the thermophile Geobacillus caldoxylosilyticus T20.

Abstract: A strain of Geobacillus caldoxylosilyticus from central heating system water could utilize a number of organophosphonates as the sole phosphorus source for growth at 60°C. During growth on glyphosate, aminomethylphosphonate release to the medium was observed, and in cell extracts, a glyphosate oxidoreductase-type activity, producing stoichiometric amounts of aminomethylphosphonate and glyoxylate from glyphosate, was detectable.