中文摘要：

以硝酸铋和碳酸钠为原料在60℃条件下合成次碳酸铋（（Bi O）2CO3）光催化剂。以亚甲基蓝、苯酚和甲基橙为光催化反应的模型化合物,考察了（Bi O）2CO3光催化剂在紫外光和可见光下光催化活性;以对苯二甲酸作为探针分子,结合化学荧光技术,研究了（Bi O）2CO3光催化剂表面羟基自由基的生成;添加各种清除剂,探究了（Bi O）2CO3光催化剂起主要催化作用的基团。结果表明：（Bi O）2CO3具有很好的可见光和紫外光光催化活性。紫外光照射下（Bi O）2CO3光催化剂比Ti O2光催化剂具有更高的光催化活性;在紫外光条件下（Bi O）2CO3和Ti O2光催化降解苯酚、甲基橙、亚甲基蓝的活性依次增高,并且,（Bi O）2CO3光催化降解甲基橙和亚甲基蓝的降解率分别达到94.3%,95.6%。可见光条件照射下,各种清除剂对（Bi O）2CO3光催化降解甲基橙的影响表明,反应体系所产生的·OH,h^＋,·O^-2都起着很重要的催化降解作用,其中·O^-2起着最主要的作用。

英文摘要：

Bismuth carbonate（（ Bi O）2CO3） photocatalyst was successfully prepared with bismuth nitrate and sodium carbonate as raw materials at 60 ℃. Photocatalytic activity of（ Bi O）2CO3was evaluated under ultraviolet-visible（ UV-Vis） light with methylene blue,phenol and methyl orange as model compounds of photocatalytic reaction. The produce of hydroxyl radical on the surface of（ Bi O）2CO3was researched with terephthalic acid as the probe molecule and with the technique of chemical fluorescence. Perssads of（ Bi O）2CO3playing catalytic actions were explored by adding various removing reagents. The results showed that（ Bi O）2CO3exhibited good catalytic activities of visible light and ultraviolet light. The UV photocatalytic activities of（ Bi O）2CO3samples were greatly enhanced compared with that of Ti O2. Under UV light irradiation,the activities of photocatalytic degradation of phenol,methyl orange,methylene blue using（ Bi O）2CO3and Ti O2 as catalysts were enhanced in turn from phenol to methylene blue,and the rates of photocatalytic degradation of methyl orange and methylene blue reached 94. 3% and 95. 6%,respectively. The effect of various radical scavengers on the degradation of methyl orange with（ Bi O）2CO3as catalyst showed that ·OH,h^＋and·O2^-,especially·O2^-,jointly dominated the photocatalytic degradation process of methyl orange under visible light irradiation.