Methods for recovering organic-inorganic element-doped metal oxides from hydrolysable metal compounds associated with contaminated water treatment
US8083950B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 18, 2006 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Jul 29, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/37
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention relates to a method for recovering an organic-inorganic element-doped metal oxide from a hydrolysable metal compound, accompanied with contaminated water treatment. The present invention comprises steps of: a) adding a hydrolysable metal compound as a coagulant to a contaminated water to form a separable floc between the hydrolysable metal compound and contaminants present in contaminated water; b) separating the separable floc and the pre-treated water after flocculation treatment; and c) calcinating the separated floc over 500° C. to produce an organic-inorganic element-doped metal oxide. More preferably, the present invention further comprises subjecting the pre-treated water of the step b) to a microwave treatment to cause a photocatalytic degradation of an organic contaminant that remains in the pre-treated water, with the assistance of the remaining hydrolysable metal compound. A novel titanium compound is found as an alternative coagulant instead of iron and aluminum salts which most widely use in water treatment. Ability, capacity and efficiency of flocculation as the proposed titanium coagulant are similar to those of FeCl3 and alum coagulants in term…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.