Mn掺杂的Bi_(2)O_(3)纳米材料的制备及其光催化活性研究

Preparation and Photocatalytic Activity of Mn Doped Bi_(2)O_(3) Nano Materials

使用五水合硝酸铋、四水合氯化锰和氢氧化铵作为原料,将其反应所得沉淀物置于马弗炉中,在500℃下煅烧5 h,制备了具有高结晶度的Mn掺杂的Bi_(2)O_(3)纳米材料。该纳米材料为片状结构,相较于相同反应条件下合成的未掺杂Mn的Bi_(2)O_(3)纳米材料而言,其对刚果红(CR)、亚甲蓝(MB)及4-硝基苯酚(4-NP)的降解表现出更优异的光催化活性。结果表明,纯Bi_(2)O_(3)纳米材料分别在90,90,270 min内对CR、MB和4-NP的降解效率为61.4%、68.7%和37.1%,而Mn掺杂的Bi_(2)O_(3)纳米材料对应的降解效率分别可达到96.1%、98.3%和93.8%。此外,Mn掺杂的Bi_(2)O_(3)纳米材料具有良好的稳定性和可重复使用性,在光催化领域和太阳能转换领域应用前景极为广阔。

Using bismuth nitrate pentahydrate,manganese chloride tetrahydrate and ammonium hydroxide as raw materials,we have known that the precipitate obtained from the reaction was placed in a muffle furnace and calcined at 500℃for 5 hours to prepare Mn doped Bi_(2)O_(3) nano materials with high crystallinity.The nano material has a sheet structure.Compared with Mn undoped in Bi_(2)O_(3) nano material synthesized under the same reaction conditions,it shows better photocatalytic activity for the degradation of Congo red(CR),methylene blue(MB)and 4-nitrophenol(4-NP).The results show that the degradation rates of Cr,MB and 4-NP by pure Bi_(2)O_(3) in 90 min,90 min and 270 min are 61.4%,68.7%and 37.1%respectively.The degradation efficiencies of Mn doped Bi_(2)O_(3) nanomaterials can reach 96.1%,98.3%and 93.8%respectively.In addition,Mn doped with Bi_(2)O_(3) nano materials will have good stability and reusability.It has broad application prospects in the field of photocatalysis and solar energy conversion.