The pH of the effluent was measured using pH paper, and pH value of the effluent was about 6. This indicated that the effluent did not contain a great deal of the Fe3+ ion. In order to further study the reason about the reduction of the iron content in the resultants, we made the qualitative experiment to determine the Fe2+ ion in the effluent selleck screening library and the mix solution of the metal salts. The Fe2+ ion can form the blood-red complex with phenanthroline. By the addition of phenanthroline, the effluent could become immediately blood-red, but the mix solution of the metal salts did not redden. This illustrated the presence of ferrous ion in the effluent. In order to demonstrate the validity of the conclusion, we used the alkali to form the precipitate and observed the gradual change on the color of the precipitate.

When the sodium hydroxide solution was added to the effluent, a large amount of white precipitate was formed in the beginning, and then the precipitate turned gradually into dark green. After standing for some time, the precipitate turned slowly to orange-red. This fits well with the color change process in which the ferrous ion is precipitated under alkaline condition and then oxidized to iron ion by air. The above testing results indicate that a part of iron ion in the experiment is reduced to ferrous ion and is not reduced entirely to iron. The standard electrode potentials of restoring the ferric ion to ferrous ion and restoring ferrous ion to iron in the corresponding half-reactions are listed as E��=?0.407?V(2)It is clear that the?E��=0.

770?VFe2++2e?��Fe?follows:Fe3++e?��Fe2+ iron ion is more easily reduced to the ferrous ion. Therefore, the iron ions in the experiment could first be reduced to the ferrous ions, and then the ferrous ions were reduced to iron atoms. However, the reduction of the Fe2+ ion to Fe atom is more difficult than the reduction of the Ni2+ ion to Ni atom and the Pb2+ ion to Pb atom. In this case, many irons ions in the reaction are reduced to the ferrous ions in a short time, but not iron atoms. This also supports the above composition analyses of the resultants. Perhaps, this is why the mole ratio of n(Fe):n(Ni):n(Pb) in the resultants is much less than 1.00:1.00:0.500, which is the mole ratio of n(FeCl3?6H2O):n(NiCl2?6H2O):n[Pb(CH3COO)2?3H2O] in the reaction raw materials. The mole ratios of n(Fe):n(Ni):n(Pb) in the resultants 1, 2, and 3 are 0.

394:1.00:0.479, 0.384:1.00:0.498, and 0.446:1.00:0.464, respectively. Hence, the percentage content of iron in resultants becomes bigger through increasing potassium borohydride addition. It is feasible that the Fe-Ni-Pb-B alloy nanoparticles are prepared by room temperature Anacetrapib solid-solid chemical reaction.4. ConclusionsIn summary, the Fe-Ni-Pb-B multicomponent alloy nanoparticles can be prepared very easily by a simple solid-solid chemical reaction method at room temperature.