CAJ | 학술논문

通过溶液浸渍蒸干过程实现了磷酸对Fe2 O3纳米粒子的表面修饰，研究了磷酸修饰对纳米Fe2 O3的热稳定性及光催化活性的影响。结果表明，磷酸修饰显著提高了Fe2 O3的热稳定性，主要归因于磷酸修饰在样品表面抑制了粒子之间的团聚生长。同时，在光催化降解气相乙醛和液相苯酚的测试中，磷酸修饰后热处理温度为600℃的样品表现出了最佳的可见光催化性能，这主要归因于该样品具有高晶化度、小粒子尺寸及大比表面积，并且适量的修饰有利于其光催化性能的提高。
통과용액침지증간과정실현료린산대Fe2 O3납미입자적표면수식，연구료린산수식대납미Fe2 O3적열은정성급광최화활성적영향。결과표명，린산수식현저제고료Fe2 O3적열은정성，주요귀인우린산수식재양품표면억제료입자지간적단취생장。동시，재광최화강해기상을철화액상분분적측시중，린산수식후열처리온도위600℃적양품표현출료최가적가견광최화성능，저주요귀인우해양품구유고정화도、소입자척촌급대비표면적，병차괄량적수식유리우기광최화성능적제고。
α-Fe2 O3 nanoparticles were modified with phosphate acid by the dipping-steam solution process. The influence of phosphate modification on the thermal stability of nanosized Fe2 O3 was investigated. The re-sults showed that the thermal stability of Fe2 O3 was remarkably enhanced by phosphate modification, owing to the inhibition of aggregation between nanoparticles by the modified phosphate groups. The sample treated at 600 ℃ showed the highest photocatalytic activity for degrading gas-phase acetaldehyde and liquid-phase phe-nol. This was ascribed to the high crystallinity, small nanoparticle size and large specific surface area of the sample. Moreover, it was favorable to improve the photogenerated charge separation after modification with a proper amount of phosphoric acid.