CAJ | 학술논문

采用微波液相法一步合成了固载型 H3 PW12 O40/ Bi2 WO6光催化剂.通过紫外-可见漫反射光谱(UV-Vis)、场发射扫描电子显微镜(SEM)、表面积及孔隙度(BET)测定、氨气程序升温脱附(NH3-TPD)、吡啶吸附红外光谱(Py-FTIR)和 X 射线衍射(XRD)对所合成催化剂的结构和性质进行了考察,并以吡啶浓度为15 mg/ g 的模拟油对光催化剂的脱氮效果进行评价.结果表明,与传统浸渍固载法相比,微波液相一步法不仅能高效合成 H3 PW12 O40/ Bi2 WO6光催化剂,且所合成的催化剂能被低能量的光激发.固载 H3 PW12 O40不但能提高 Bi2 WO6纳米颗粒的表面酸量,还能通过改变 Bi2 WO6前驱液的酸强度来调控催化剂形貌.在H3 PW12 O40固载量为15%(质量分数),微波功率为800 W,反应时间为90 min 条件下得到的 H3 PW12 O40/Bi2 WO6的光催化脱氮活性最高,在催化剂与模拟油质量比为1/300,500 W 氙灯光照60 min 的最佳光催化反应条件下,模拟油脱氮率达到92.63%.
채용미파액상법일보합성료고재형 H3 PW12 O40/ Bi2 WO6광최화제.통과자외-가견만반사광보(UV-Vis)、장발사소묘전자현미경(SEM)、표면적급공극도(BET)측정、안기정서승온탈부(NH3-TPD)、필정흡부홍외광보(Py-FTIR)화 X 사선연사(XRD)대소합성최화제적결구화성질진행료고찰,병이필정농도위15 mg/ g 적모의유대광최화제적탈담효과진행평개.결과표명,여전통침지고재법상비,미파액상일보법불부능고효합성 H3 PW12 O40/ Bi2 WO6광최화제,차소합성적최화제능피저능량적광격발.고재 H3 PW12 O40불단능제고 Bi2 WO6납미과립적표면산량,환능통과개변 Bi2 WO6전구액적산강도래조공최화제형모.재H3 PW12 O40고재량위15%(질량분수),미파공솔위800 W,반응시간위90 min 조건하득도적 H3 PW12 O40/Bi2 WO6적광최화탈담활성최고,재최화제여모의유질량비위1/300,500 W 선등광조60 min 적최가광최화반응조건하,모의유탈담솔체도92.63%.
Immobilized nano-photocatalysts H3 PW12 O40 / Bi2 WO6 was prepared by microwave liquid one-step process. The morphology, structure and properties of the prepared catalysts were characterized and investiga-ted by UV-Vis diffuse reflectance spectra, scanning electron microscopy(SEM), NH3 temperature programmed desorption( NH3-TPD), pyridine adsorption Fourier transform infrared spectroscopy ( Py-FTIR) and X-ray diffraction(XRD), respectively. Their photocatalytic denitrification properties were evaluated by using the model oil with 15 mg / g pyridine. The results show that H3 PW12 O40 / Bi2 WO6 photocatalysts could be more effi-ciently synthesized by microwave liquid one-step process, and it could be excited by lower photon energy than that synthesized by common impregnation immobilization method. Immobilization of H3 PW12 O40 on Bi2 WO6 could improve the acid content in Bi2 WO6 nanoparticle surface, change the acid strength of Bi2 WO6 precursor solution thereby controll the catalyst morphology. The influences of preparation conditions on photocatalytic properties of H3 PW12 O40 / Bi2 WO6 were investigated. It was found that H3 PW12 O40 / Bi2 WO6 nano-photocata-lyst, with the H3 PW12 O40 loading(mass fraction) of 15% , prepared by microwave liquid one-step process un-der microwave power 800 W for 90 min possessed the best performance in the photocatalytic denitrification of model oil containing photocatalysts( mass ratio of catalyst to model oil was 1 / 300) after 500 W Xe lamp irradiation for 60 min, with the denitrification rate reached 92. 63% .