National Repository of Grey Literature 10 records found  Search took 0.00 seconds. 
Magnesium Silicide and Germanide from Electronic Waste as a Source of CVD Precursors for Potential Catalysts Preparation.
Bumba, Jakub
This work is focused on the regeneration of silicon and germanium from electronic waste and on the possibility of intermediate products utilization e.g. for chemical vapour deposition (CVD) and catalysis.
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Recovery of Waste Semiconductors for CVD Precursors.
Bumba, Jakub ; Dytrych, Pavel ; Fajgar, Radek ; Dřínek, Vladislav
The newly patented method for regeneration of ultrapure silicon and germanium via magnesium silicide and magnesium germanide from waste photovoltaic (PV) cells, broken germanium lenses and waste magnesium chips was utilized to obtain chemical vapour deposition (CVD) precursors for application in electronics, optics or nanoparticles synthesis. Magnesium silicide and germanide were prepared directly by thermal synthesis from waste materials in optimized tube reactor at 400°C and 5 Pa. X-Ray Diffraction (XRD) confirmed 97.9% respective 95% purity of products. The presence of silicon and germanium hydrides (CVD precursors) prepared by acid hydrolysis in the second step of the process was verified by Gas Chromatography–Mass Spectroscopy (GC/MS) and Fourier Transform Infrared Spectroscopy (FTIR). The crude, unrefined mixture of silicon hydrides served as raw material for CVD experiment at different substrates. SEM images confirmed occurrence of various micro and nano particles which could be used in electronics, optics and catalysis.
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Magnesium Silicide and Germanide from Waste as a Source of CVD Precursors and Ultrapure Semiconductors.
Bumba, Jakub
From that reason the newly patented process, in which waste photovoltaic panels and optical lenses served as a raw materials, was tested to be the lucrative source of silicon or germanium for CVD precursors.
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Utilization of Nanomaterials for Water Treatment.
Šolcová, Olga ; Bumba, Jakub ; Krystyník, Pavel ; Maléterová, Ywetta ; Soukup, Karel ; Kaštánek, František
This work is focused on preparation and characterization of various nanomaterials applied in sorption, oxidation, electrocoagulation and photocatalysis techniques. The main aim is the study of their effective combination and activity testing in purification processes.
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Preparation of Magnesium Silicide and Magnesium Germanide from Waste for Material Recovery.
Bumba, Jakub
This work is focused on low-temperature recycling processes of silicon and germanium.\n\n
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Preparation of Magnesium Silicide from Recycled Materials for Energy Storage.
Bumba, Jakub ; Dytrych, Pavel ; Šolcová, Olga ; Koštejn, Martin ; Fajgar, Radek ; Maléterová, Ywetta ; Kaštánek, František
Recycling technologies help to save energy, materials and environment. This is the main reason of their popularity. The recovery of semiconductors and metals depends on recycling treatment. A new multi-step technology, which enables to obtain pure silicon and hydrogen from waste materials,is reported in this study. The only by-product is magnesium phosphate, which is a desired fertilizer. Magnesium silicide was successfully prepared from milled silicon photovoltaic (PV) panels and milled Mg obtained from the scrap. The formed magnesium silicide was then hydrolysed by phosphoric acid to form a mixture of silanes. Gaseous products (silanes) were separated by cooling below their boiling temperature by liquid nitrogen and then thermally decomposed by a hot wire, e.g. Pt.This treatment leads to pure silicon and hydrogen release. In this study a deep-in characterization by various methods spectroscopy, Scanning Electron Microscopy (SEM) with Energy Dispersive X- Ray spectroscopy (EDX), etc.) of prepared samples was also done to explain the individual influences, e.g. reaction temperature and atmosphere.
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Magnesium Silicide for Energy Storage and Recycling Technology.
Bumba, Jakub ; Dytrych, Pavel ; Kaštánek, František ; Šolcová, Olga
The aim of this study is to optimize the reaction conditions that would ensure efficient and economical process. This could lead up to new design for photovoltaic panel recycling technologies, hydrogen production and storage.
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Combination of Various Nanomaterials for Effective Water Purification.
Morozová, Magdalena ; Krystyník, Pavel ; Bumba, Jakub ; Šolcová, Olga
This work is focused on preparation and characterization of various nanomaterials applied in sorption, oxidation, electrocoagulation and photocatalysis techniques. The main aim is the study of their effective combination and activity testing in purification processes.
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Preparation of Magnesium Silicide from Scrap for Hydrogen and Pure Silicon Production.
Bumba, Jakub
This work is focused on preparation of magnesium silicide to purify silicon via waste-free route.
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