采用甘露醇辅助水热法合成了BiPO4光催化剂,并以罗丹明B为目标降解物考察其光催化活性.采用XRD、SEM、FTIR、UV-vis DRS和N2吸附对产物进行了表征.结果表明,170℃水热24h条件下甘露醇的加入不改变产物晶型,而产物的形貌从棱柱状变为多面体,随着加入量的增多,多面体尺寸减小,继续增大加入量,产物形貌出现分级结构的趋势.水热温度低或时间短时,产物为六方相,呈端面有突起的棒状,水热温度升高或时间延长,产物为单斜相,呈多面体状.但结晶度均较高.单斜相产物的形成经历了六方相的转变过程.所得产物结构中不含甘露醇,但有结晶水.170℃下甘露醇辅助制得的单斜相BiPO4的光催化活性最高,无甘露醇的条件下得到的单斜相产物的光催化活性次之,110℃下甘露醇辅助制得的六方相产物活性最差,这可能与它们的光响应范围大小不同有关.
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