Yissum Research Development Company of the Hebrew University of Jerusalem Ltd.

Hani Gnayem

Yoel Sasson

Sanaa Shenawi-Khalil

The invention provides a process for the preparation of bismuth oxyhalide, comprising a precipitation of bismuth oxyhalide in an acidic aqueous medium in the presence of a reducing agent. Also provided are bismuth oxyhalide compounds doped with elemental bismuth Bi. The use of Bidoped-bismuth oxyhalide as photocatalysts in water purification is also described.

Photocatalysts based on bismuth oxyhalide, process for their preparation and uses thereof

The invention provides a process for the preparation of bismuth oxyhalide, comprising a precipitation of bismuth oxyhalide in an acidic aqueous medium in the presence of a reducing agent. Also provided are bismuth oxyhalide compounds doped with elemental bismuth Bi. The use of Bidoped bismuth oxyhalide as photocatalysts in water purification is also described.

Bismuth oxyhalide-added building materials are disclosed. The building material is a binder-containing building material, which sets and harden when mixed with water, such as gypsum and cement-based building material. Methods for applying bismuth oxyhalide&#x2014;comprising coatings onto surfaces of building materials, to protect them against pollutants, are described.

Additive-incorporated building materials

Mixed chloride-bromide bismuth oxyhalide compounds, with the molar ratio chloride:bromide being equal to or greater than 1:1, in the form of microspheres exhibiting flower-like surface morphology, are disclosed. Processes for preparing the compounds, formulations of the compounds and a method for purifying water using said compounds are also disclosed.

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Baqa-el Gharbia, Israel

Hani Gnayem