Iron nitrate and nickel nitrate 1,000-ppm (1-mg/mL) standard solutions were purchased from EM Science (Gibbstown, New Jersey) and Absolute Standards, Inc.
Iron nitrate and nickel nitrate solutions were used to bathe the wood char for the purpose of improving the production yield.
2[degrees] after treatment with the standard 1,000-ppm iron nitrate solution (Sample E).
At high temperatures, the iron nitrate decomposed into iron oxide, and most of this iron oxide was further reduced to iron by the abundant carbon sources.
Interestingly, no obvious peaks for iron nitrate were present from 10[degrees] to 60[degrees] in Sample I, which was treated with the 10 percent (wt/wt) iron nitrate solution.
The impregnation of iron nitrate or nickel nitrate into the wood char significantly improved the yield of these carbonaceous nanoparticles.