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The europium catalyst refers to a metal europium, a europium salt or a europium complex having a catalytic function. Europium is a silver-gray solid and belongs to one of rare earth metals. It is the least dense, softest and most volatile element of rare earth elements. It is mainly found in monazite and bastnasite. Europium is the most active metal in rare earth elements. At room temperature, it immediately loses its metallic luster in the air and is quickly oxidized into a powder. Europium reacts violently with cold water to form hydrogen. It also can react with boron, carbon, sulfur, phosphorus, hydrogen, nitrogen, and the like. The common valence of europium has +2 and +3. Europium oxides and nitrates all have certain catalytic functions and are often used as catalysts.
Figure 1. Europium nitrate catalyst
The europium catalyst has the characteristics of non-toxicity in the ultraviolet region, high self-stability, and strong absorption capacity, and has high-efficiency photodegradability for organic pollutants. Because europium catalysts exhibit good catalytic effects in photocatalytic reactions, they have many applications in the field of environmental protection.
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