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. https://zenodo.org/record/1861992.
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. doi:10.1006/jcis.1999.6507. PMID 10550244. Bibcode: 1999JCIS..220...88K.
5. ↑ Benjamin, Mark M.; Lawler, Desmond F. (13 June 2013). Water Quality Engineering: Physical / Chemical Treatment Processes. ISBN 9781118632277. https://books.google.com/books?id=vRovU0TD8s0C&pg=PA265.
6. ↑ Paunovic, Milan; Scherson, Daniel (1997). Proceedings of the Third Symposium on Electrochemically Deposited Thin Films. ISBN 9781566771696. https://books.google.com/books?id=AekdKO-pimUC&pg=PA194.
7. ↑ Brandon, Erik J. (2003). Micropower and Microdevices: Proceedings of the International Symposium. ISBN 9781566773874. https://books.google.com/books?id=M74FAswC1F0C&pg=PA52.
8. ↑ Rycroft, David W.; Amer, M. H. (1995). Prospects for the Drainage of Clay Soils. ISBN 9789251036242. https://books.google.com/books?id=Jxlx4g4cdisC&pg=PA1.

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