CAJ | 학술논문

采用水热合成法制备稀土元素Ce3+掺杂Bi2WO6光催剂,通过X射线衍射、场发射电镜扫描、紫外-可见漫反射光谱、N2物理吸附-脱附等手段对合成材料的结构、形貌、光吸收等物理化学性能进行表征,并以染料废水中罗丹明B的降解考察其光催化活性.结果表明,Ce3+掺杂量为0.05%时,其结晶度好、颗粒较均匀、具有较强的可见光吸收性能,且比表面积比纯Bi2WO6提高近10%以上,对罗丹明B的去除效果最好;催化剂用量越高、罗丹明B的初始浓度越低、反应溶液pH值越低、H2O2的浓度越高越有利于Ce/Bi2WO6对罗丹明B的吸附和降解;而阴阳离子的影响各不相同:NO3-、SO42-没有太大的影响; Na+、K+、Ca2+、Mg2+、Cl-的加入均促使的染料的去除;HCO3-抑制了罗丹明B的吸附,但是却促进了光降解.另外,经重复使用3次,光催化降解速率常数并没有降低,表明稀土Ce3+改性Bi2WO6是一种有效稳定的光催化剂.
채용수열합성법제비희토원소Ce3+참잡Bi2WO6광최제,통과X사선연사、장발사전경소묘、자외-가견만반사광보、N2물리흡부-탈부등수단대합성재료적결구、형모、광흡수등물이화학성능진행표정,병이염료폐수중라단명B적강해고찰기광최화활성.결과표명,Ce3+참잡량위0.05%시,기결정도호、과립교균균、구유교강적가견광흡수성능,차비표면적비순Bi2WO6제고근10%이상,대라단명B적거제효과최호;최화제용량월고、라단명B적초시농도월저、반응용액pH치월저、H2O2적농도월고월유리우Ce/Bi2WO6대라단명B적흡부화강해;이음양리자적영향각불상동:NO3-、SO42-몰유태대적영향; Na+、K+、Ca2+、Mg2+、Cl-적가입균촉사적염료적거제;HCO3-억제료라단명B적흡부,단시각촉진료광강해.령외,경중복사용3차,광최화강해속솔상수병몰유강저,표명희토Ce3+개성Bi2WO6시일충유효은정적광최화제.
Rare earth element Ce3+ doped Bi2WO6 was synthesized by hydrothermal method. The physicochemical properties of prepared materials were characterized by XRD, SEM, UV-vis DRS and N2adsorption-desorption. Rhodamine B was used to as the objective pollutant to investigate the photocatalytic activity of Ce/Bi2WO6. As a result, Ce/Bi2WO6 (0.05%) has the optimum phtocatalytic activity to removal rhodamine B, which has good crystalinity, uniform shape and size, strong visible light-responsible property and the higherSBET value (ca. 10%) than pure Bi2WO6. Much more amount of catalyst, less concentration of Rhodamine B, lower pH value of the reaction solution and higher concentration of H2O2 all benefit the adsorption and photodegradation of Rhodamine B by Ce/Bi2WO6. The common inorganic ions showed different effects on Rhodamine B degradation. There was no significantly effect of NO3- and SO42-; but the addition of Na+, K+, Ca2+, Mg2+, Cl- inhibited the removal of the dye. HCO3- reduced the adsorption of Rhodamine B but accelerated its photodegradation. In addition, after three recycling runs, Ce/Bi2WO6(0.05%) still kept high photocatalytic activities on the degradation of rhodamine B.