Hydrous oxide

Hydrous oxides are inorganic compounds of a metal, hydroxide, and weakly bound water. Some examples include:

• Hydrous ferric oxide (HFO)^[1]
• Hydrous cupric oxide^[2]
• Hydrous thorium oxide (THO) and hydrous titanium oxide (TiHO) ^[3]
• Hydrous aluminum oxide (HAO)^[4]

Some of them, such as HFO and HAO, are precipitated in highly porous poorly crystalline or amorphous forms and therefore are good adsorbents used for example in water treatment.^[5]

Some others are gels.

Hydrous oxide films may be used an various applications such as electrocatalysis, supercapacitors, and sensors.^[6][7]

HFO and HAO may also result from oxidative weathering of rocks to produce iron an aluminum hydrous oxide clay soils.^[8]

See also

• Hydrate
• Ferrihydrite

References

1. Weiser, H. B. (1920). "Hydrous Oxides. I". The Journal of Physical Chemistry. 24 (4): 277–328. doi:10.1021/j150202a003.
2. Weiser, H. B. (1923). "Hydrous Oxides. V". The Journal of Physical Chemistry. 27 (6): 501–532. doi:10.1021/j150231a001.
3. Heitner-Wirguin, C.; Albu-Yaron, A. (1966). "Hydrous oxides and their cation exchange properties—II Structure and equilibrium experiments". Journal of Inorganic and Nuclear Chemistry. 28 (10): 2379–2384. doi:10.1016/0022-1902(66)80129-X.
4. Karthikeyan, K.G; Elliott, Herschel A. (1999). "Surface Complexation Modeling of Copper Sorption by Hydrous Oxides of Iron and Aluminum". Journal of Colloid and Interface Science. 220 (1): 88–95. Bibcode:1999JCIS..220...88K. doi:10.1006/jcis.1999.6507. PMID 10550244.
5. Benjamin, Mark M.; Lawler, Desmond F. (13 June 2013). Water Quality Engineering: Physical / Chemical Treatment Processes. ISBN 9781118632277.
6. Paunovic, Milan; Scherson, Daniel (1997). Proceedings of the Third Symposium on Electrochemically Deposited Thin Films. ISBN 9781566771696.
7. Brandon, Erik J. (2003). Micropower and Microdevices: Proceedings of the International Symposium. ISBN 9781566773874.
8. Rycroft, David W.; Amer, M. H. (1995). Prospects for the Drainage of Clay Soils. ISBN 9789251036242.