陕西科技大学学报(自然科学版)
陝西科技大學學報(自然科學版)
협서과기대학학보(자연과학판)
Journal of Shaanxi University of Science and Technology (Natural Science Edition)
2015年
5期
70-75
,共6页
刘保健%高玉刚%于凯烁%韩晓龙%姚宝晶%王兰
劉保健%高玉剛%于凱爍%韓曉龍%姚寶晶%王蘭
류보건%고옥강%우개삭%한효룡%요보정%왕란
铈%氟%纳米二氧化钛%溶胶凝胶法%动力学%机理
鈰%氟%納米二氧化鈦%溶膠凝膠法%動力學%機理
시%불%납미이양화태%용효응효법%동역학%궤리
Ce%F%nano-TiO2%sol-gel method%kinetics%mechanism
以四氯化钛、硝酸铈、氟化铵为原料,采用溶胶‐凝胶法制备了铈、氟掺杂的纳米二氧化钛三元光催化剂。通过X射线衍射仪(XRD)、扫描电镜(SEM )、能谱仪(EDS )等对三元光催化剂的结构进行了相应的分析表征,结果表明:与市售纯纳米二氧化钛相比,铈和氟掺杂后的三元光催化剂晶相中产生了次晶相和微量相,颗粒中出现新的多边棱块结构,并且光的响应范围拓展到可见光区。使用紫外可见光谱仪测试了催化剂降解下甲基橙的降解率;测试结果表明,在三元光催化剂的作用下,完全降解甲基橙的时间缩短到30 min以内;最后,探讨了三元光催化剂的作用机理,通过动力学计算,三元催化剂降解甲基橙的反应符合假一级反应规律。
以四氯化鈦、硝痠鈰、氟化銨為原料,採用溶膠‐凝膠法製備瞭鈰、氟摻雜的納米二氧化鈦三元光催化劑。通過X射線衍射儀(XRD)、掃描電鏡(SEM )、能譜儀(EDS )等對三元光催化劑的結構進行瞭相應的分析錶徵,結果錶明:與市售純納米二氧化鈦相比,鈰和氟摻雜後的三元光催化劑晶相中產生瞭次晶相和微量相,顆粒中齣現新的多邊稜塊結構,併且光的響應範圍拓展到可見光區。使用紫外可見光譜儀測試瞭催化劑降解下甲基橙的降解率;測試結果錶明,在三元光催化劑的作用下,完全降解甲基橙的時間縮短到30 min以內;最後,探討瞭三元光催化劑的作用機理,通過動力學計算,三元催化劑降解甲基橙的反應符閤假一級反應規律。
이사록화태、초산시、불화안위원료,채용용효‐응효법제비료시、불참잡적납미이양화태삼원광최화제。통과X사선연사의(XRD)、소묘전경(SEM )、능보의(EDS )등대삼원광최화제적결구진행료상응적분석표정,결과표명:여시수순납미이양화태상비,시화불참잡후적삼원광최화제정상중산생료차정상화미량상,과립중출현신적다변릉괴결구,병차광적향응범위탁전도가견광구。사용자외가견광보의측시료최화제강해하갑기등적강해솔;측시결과표명,재삼원광최화제적작용하,완전강해갑기등적시간축단도30 min이내;최후,탐토료삼원광최화제적작용궤리,통과동역학계산,삼원최화제강해갑기등적반응부합가일급반응규률。
Preparation of the photocatalyst ,nano‐doped with Ce and F ,using TiCl4 ,Ce(NO3 )4 and N H4 F by modified sol‐gel method .Crystal form ,surface morphology ,elements and opti‐cal absorption of the ternary photocatalyst and nano‐TiO2 commercially available were char‐acterized by XRD ,SEM ,EDS and UV‐vis DRS .Under the effect of photocatalysts ,the deg‐radation rate of methyl orange was tested by UV‐vis spectroscopy .The results indicated some phenomenon as follows .Compared with pure TiO2 ,there appears minor phase and trace phase in ternary photocatalyst ;There are structure of multilateral block in the particles of ternary photocatalyst ;ternary photocatalyst responded to wider wavelength of light ;And the degradation efficiency of methyl orange was higher .The experiment showed that the degra‐dation of methyl orange was in accordance to pseudo‐first‐order process .From the above , the mechanism of the photocatalytic degradation was explored .