Oxygen defects were still the key sites for NO reduction into [N.sub.2] and the deposited carbon acted as a buffer reductant
CO and [H.sub.2] were much better reductants
for NO than the hydrocarbons.
The chemical composition of the iron ore used in this study is shown in Table 1, while the proximate analyses of the anthracite and the cow dung used as the reductant
in this study are given in Table 2.
Furthermore, a little of surfactants and reductants
remained on the surface of as-prepared HAuNFs substrates, characterized by some Raman bands and shown in Figure 3(d) (red curve).
To promote the C[O.sub.2] reduction performance of photocatalyst, it is important to select the optimum reductant
which provides the proton for the reduction reaction.
A different study  showed that triazole derivatives are good reductants
"As well as cheaper, lower-grade reductants
such as anthracite or coal, it can also make use of carbon-neutral bioreductants produced from renewable sources like charcoal made from local wood.
indicated that using of a strong reductant
such as borohydride resulted in small particles that were somewhat monodispersed, but the generation of larger particles was difficult to control.
Martin, "Influence of single use and combination of reductants
on the size, morphology and growth steps of gold nanoparticles in colloidal mixture," Open Journal of Physical Chemistry, vol.
Previous studies have suggested that TP have functioned as both the "green" reductant
and the capping agent for the synthesis of some metal nanospheres and no surfactant was used (23-26).
This reduction is carried out by TrxR using NADPH as a reductant
(Figure 1) [49, 50].
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