Disabled Javascript!  

Science Library.info

 You are reading this message because you have attempted to access a page on www.umwelt.science which requires Javascript to be enabled.

Javascript is an essential tool for much functionality on the internet, and is perfectly safe to use, since modern browsers prevent abusive use. If you have it disabled, you will not be able to run any interactive software.

You can enable it from the menubar of your browser, following these instructions: Instructions for enabling Javascript on different Browsers


Organic Chemistry

  • Activated carbon

    • Activated carbon is derived from charcoal, and is used as biochar. It is a form of carbon with a high degree of adsorption, due to small, low-volume pores (high microporosity) which increase the surface area.

      One gram of activated carbon has a surface area of approx. 1,300 m2. Activated carbon contains more than 90% carbon.

      Activated carbon, coal and coke are derived from charcoal, coal, and coke respectively. Charcoal is produced by slow pyrolysis, in which wood or other organic material is heated in the absence of oxygen.

  • Near-infrared spectroscopy

    • Near-infrared spectroscopy, NIRS, utilises the electromagnetic radiation range 700 - 2500 nm. It is used for deeper penetration of samples than is possible with other EMR spectra, such as mid-infrared radiation.

      Near-infrared spectroscopy (NIRS) is a spectroscopic method used in pharmaceuticals, medical diagnostics (including blood sugar and pulse oximetry), food and agrochemical quality control. Its research applications include functional neuroimaging, sports medicine, ergonomics, brain computer interface, and neurology (neurovascular coupling).

  • Pyrolysis

    • Pyrolysis involves high temperatures and an absence of halogens, such as oxygen, in which organic material will thermochemically decompose.

      Pyro is Greek for 'fire', and lysis is Greek for 'division of'.

      The resulting chemical composition and physical phase changes are irreversible. An example is the production of char, a solid rich in carbon, from wood, or coke from coal. Products in industrial applications include activated carbon, methanol, charcoal, from wood, and pyrolysis is used in the production of PVC by the conversion of ethylene dichloride into vinyl chloride.

      In plastics recycling, pyrolysis is used to turn waste plastics into usable oil, or inert substances for disposal. Pyrolysis is the process behind 'cracking' in which heavy hydrocarbons are converted into lighter fuels like petrol.

  • Hydrogenation

    • Hydrogenation is a chemical process through which hydrogen atoms are added to a molecule.

      Hydrogenation is generally done via a catalyst, such as nickel or platinum, although high-temperature non-catalytic hydrogenation is also possible.

      Applications include reduction or saturate organic compounds, such as an alkene, usually with hydrogen gas (H2).