Eine der wichtigen Aufgaben ist die Verwertung von Feststoffen aus thermischen oder nicht-thermischen Verfahren zur Energiegewinnung.
Eine vielfältige Nutzung bietet sich an. Der untenstehende link aus You tube gibt dazu eine einfache Erklährung.
„Garbage and other low-value materials make excellent starting materials for high-quality graphene, according to a study by Rice University chemists in ACS Nano (DOI: 10.1021/nn202625c). The report describes a straightforward procedure to convert inexpensive sources of carbon—even “negative value” materials such as dog feces—to ultrathin films of pure carbon.
Graphene’s large collection of outstanding mechanical, electronic, thermal, and other properties have prompted many scientists to search for ways to prepare large sheets of this often one-atom-thin form of carbon. Several chemical vapor deposition methods do that job well, but they generally require expensive substrates on which to grow graphene and/or reagents such as methane, acetylene, and organic solids that must be purified before use.
The Rice team, led by James M. Tour, has shown that there’s no need to use costly purified starting materials to grow graphene. The team, which also includes Gedeng Ruan, Zhengzong Sun, and Zhiwei Peng, prepared graphene from feces, grass, a cockroach leg, bulk polystyrene, chocolate, and Girl Scout cookies.
In all cases, the group placed a solid sample on copper foil in a quartz boat and briefly heated the material to 1,050 °C under a low-pressure hydrogen-argon flow. The team reports that residues containing several elements remained on the sample side of the foil after heat treatment. On the back side, however, they found pristine and nearly defect-free graphene, as judged from analyses based on Raman, UV-visible, and X-ray photoelectron spectroscopies and microscopy analysis.
“These results show convincingly that large-scale high-quality graphene can be grown from impure carbon sources with low or negative values,” says Changgan Zeng of the University of Science & Technology of China, Hefei. “This is quite amazing, since we usually assume that high-quality graphene requires pure carbon sources,” Zeng says. He adds that “the idea is brilliant,” but the mechanism by which graphene forms on the back of the foil is still unknown.“
This is the most valuable product pruduced in a hight temperature, low pressure system I have found untill now.
The oldest one is the production of terra preta by the Indios. Another bunch of possibilities are mentioned by another author.
„I am one of the founders of the Pioneer Valley
Biochar Initiative with a website that may be found at pvbiochar.org/forum and
is cencered at Belchertown, MA and interacts with the University of
Massachusetts in Amherst. We are concerned with the production and use of
biochar which mar serve to:
1. Sequester atmospheric CO2
2. Aid agricultural growth
3. Reduce fetilizer needs and
4. Provide a use for farm and forestry
5. Restore depleted and/or contaminated
6. Reduce need for water for agricultural
7. Render small farms more self-sufficient and
serve as a secondary energy source
I was co author of a paper on this
presented on Aug. 26 ant the Symposium on „Black Carbon“ at sessions of the
Environmental Chemistry Division of the Boston ACS meeting. I shall be happy to
offer copies of the PowerPoints used for this presentation and of related papers
and videos. For more information, please contact me at <firstname.lastname@example.org> or by phone
at 413-549-0245. A pdf file of a pdf of the ACS presentation is attached as well
as one of URL’s of some of my postings on the web.“
Therefor I want to stress that in the case of thermic or enzymatic production of energy Synthesisgas, Green Diesel and Biochar. Biochar is a valuable „Byproduct“. Maybe all these processes should tend to maximize Green Hydrogen as the energycarrier of the future.