CAJ | 학술논문

采用复合溶胶-凝胶和水热技术制备了金属镧掺杂的二氧化钛纳米管催化剂1.2%-La3+-TNTs，研究了其在波长254 nm紫外光照射下催化转化气态污染物α-蒎烯的特性。X射线衍射、透射电镜、发光光谱和比表面测试分析表明，获得的催化剂具有混合晶型、介孔结构、PL发光信号弱、比表面积大等特征。在相对湿度40%~50%、停留时间60 s时，该催化剂对50 mg?m?3的α-蒎烯转化率达到了92%，且反应介质的相对湿度对其转化有一定的影响。波长185 nm的UV灯可以使其恢复活性，再生3 h后催化性能恢复60%以上。碳平衡和光解产物分析表明，当湿度40%~50%时，产物的水溶性和可生化性较好，大约有55%的α-蒎烯转化为水溶性的碳，吸收液的B/C达到了0.36，产物的生态毒性得到了显著改善。光解产物主要是松莰酮、3-羟基-α-蒎烯等和一些小分子醛酮和羧酸类物质。制备的1.2%-La3+-TNTs可广泛用于气态污染物的治理。
채용복합용효-응효화수열기술제비료금속란참잡적이양화태납미관최화제1.2%-La3+-TNTs，연구료기재파장254 nm자외광조사하최화전화기태오염물α-파희적특성。X사선연사、투사전경、발광광보화비표면측시분석표명，획득적최화제구유혼합정형、개공결구、PL발광신호약、비표면적대등특정。재상대습도40%~50%、정류시간60 s시，해최화제대50 mg?m?3적α-파희전화솔체도료92%，차반응개질적상대습도대기전화유일정적영향。파장185 nm적UV등가이사기회복활성，재생3 h후최화성능회복60%이상。탄평형화광해산물분석표명，당습도40%~50%시，산물적수용성화가생화성교호，대약유55%적α-파희전화위수용성적탄，흡수액적B/C체도료0.36，산물적생태독성득도료현저개선。광해산물주요시송감동、3-간기-α-파희등화일사소분자철동화최산류물질。제비적1.2%-La3+-TNTs가엄범용우기태오염물적치리。
Lanthanum (La3+)-doped TiO2 nanotubes with excellent photocatalytic activity were prepared by combining the sol–gel method and hydrothermal techniques. XRD, TEM, P-L spectra and BET results reveal that these nanotubes have mixed phases, mesoporous structure, lower luminescence signal and larger specific surface. When the relative humidity of reaction media and the reaction time were controlled at 40%~50% and 60 s, respectively, the conversion efficiency of 50 mg?m?3α-pinene is 92%. The deactivated catalyst could be regenerated by irradiating it in air with UV lamp having wave length of 185 nm and over 60% catalytic activity could be restored after irradiation for 3 h. Analysis of the light decompositing product suggests that about 55%α-pinene can be converted to water soluble product under relative humidity of 40%~50%, and the B/C and toxicity of the intermediates are improved. The main intermediates are pinocamphone, 3- hydroxy-α- pinene and small carbonyl organics. These results show that the prepared catalyst can be applied in gaseous pollutant treatments.