Hydrous oxide
Hydrous oxides are inorganic compounds of metal, hydroxide and weakly bound water. Some common examples include:
- Hydrous ferric oxide (HFO) also [2]
- Hydrous cupric oxide [3]
- hydrous thorium oxide (THO) and hydrous titanium oxide (TiHO) [1]
- hydrous aluminum oxide (HAO)[4]
Some of them (eg HFO, HAO) are precipitated in highly porous poorly crystaline or amorphous forms and therefore good adsorbents used eg in water treatment, [5] see also Ferrihydrite.
Some others are gels.
Various hydrous oxide films may be used an various applications such as electrocatalysis, supercapacitors, sensors, etc.[6] [7]
HFO and HAO may also result from oxidative weathering of rocks to produce iron an aluminum hydrous oxide clay soils.[8]