2, we see three weight losses: the first loss happens around 110 AdegC accompanied by an endothermic peak, which corresponds to the loss of water physically adsorbed, the second loss takes place at 450 AdegC and is chemically related to adsorbed water
, the most important loss (43 %) at 800 AdegC corresponds to the decomposition of (Ca,Mg)CO3 with an endothermic peak , indicating the release of CO2 according to the following reaction:
The left shoulder observed for HTA3F0 sample is related to dehydration of the external surface adsorbed water
, while the main peak close to 200[degrees]C refers to desorption of interlayer water molecules.
The bands at 3234 [cm.sup.-1] and 1638 [cm.sup.-1] are attributed to the surface hydroxyl groups or adsorbed water
strongly bound to the Zr[O.sub.2] surfaces .
But one of the most prominent disadvantages of the coprecipitation method is that the NPs usually contain large amount of adsorbed water
, which essentially affects spectral properties of the synthesized nanoparticles, including their luminescent features [18, 19].
In the photocatalytic process, two events can occur simultaneously: one involves the oxidation of adsorbed water
in the photogenerated holes in the VB, generating hydroxyl radicals (O[H.sup.*]) that have a high oxidation power of organic compounds and the second is related to the reduction of an acceptor of electrons (usually dissolved [O.sub.2] or C[O.sub.2]) that were excited to CB.
Other contributions to this band are adsorbed water
and the hydroxide anion.
is kind of like a fourth state of matter (Figure 3).
Upon increasing the water vapor density, an increase in capacitance was noted as the paper device adsorbed water
In the plastic package, however, the powder adsorbed water
because of the inefficient barrier, and the water easily bound with the low-molecular weight molecules (fructose, glucose and sucrose) present in the juice in powder.
The band observed at 3460 cm-1 and 3437 cm-1 were assigned to O-H stretching vibrations of adsorbed water
When heated, the desiccant releases its adsorbed water
molecules, which are purged to the atmosphere.
Dehydration reactions involving loss of adsorbed water
and destruction of structural OH during kaolinite dehydroxylation is considered to have accounted for the observed mass losses.