In this sense, a research group of the Department of Inorganic Chemistry of the University of Granada works on a project subsidized by the Spanish Ministry of Environmental Issues to obtain activated coal from polymeric waste as raw materials.
Activated coal is a solid with a big specific area, as it presents numerous pores of the order of the nanometres which make that a surface area of a small quantity of coal ranks equally with the area of a football pitch, as points out the coordinator of the group Francisco Javier López Garzón.
It is used to manufacture filters for cigarettes, in catalysis processes, or in the decontamination of the atmosphere, among other applications. This is, precisely, in the ambit of gaseous effluents depuration, where the research group has been working for four years to obtain activated coal with a developed and homogeneous porosity and lower production expenses at the same time. In general, commercial activated coal are obtained from precursors like olive pits, almond shells or coconut shell, natural and heterogeneous products that produce heterogeneous coal, unselective as regards the absorption of pollutant substances.
Scientists have found an alternative to the use of organic polymers as precursors. However, such precursors are very expensive. That is why they have selected a waste polymer like terephthalate of polyethylene, commonly known as PET, a plastic material used in the production of drink containers. Taking into account that such waste is calculated in millions of tons in all Europe, it is an abundant raw material, easily available, because at best, these containers end up in controlled garbage dumps, whose salvage would involve the compliance of the European regulation currently in force.
The transformation of the PET into active coal is carried out by means of a process of pyrolysis, this is, the material is burnt in a special oven and in the absence of oxygen, in such a way that it does not react with coal, which is the desired product. The researchers have obtained a highly porous, selective and uniform active coal, as they have proved through absorption tests carried out with molecules of different sizes, from nitrogen to organic vapours. Faced with the obtained results, the team is experimenting with other polymeric materials, at the same time that they optimize the production process to obtain a performance of 60%, as an important fraction of the PET volatilizes during the process, and it is necessary to recover it and turn it into coal.
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
The disappearance of common species
01.02.2018 | Technical University of Munich (TUM)
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).
Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
16.02.2018 | Information Technology
16.02.2018 | Health and Medicine
16.02.2018 | Physics and Astronomy