摘要
采用同轴静电纺丝法制备了SnO_2-TiO_2纳米纤维,用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FTIR)和紫外-可见光谱能谱仪(UV-Vis),表征了SnO_2-TiO_2纳米纤维相组成和微观形貌,评价了催化剂表面化学形态和吸光特性,研究了SnO_2含量、光源条件、温度和催化稳定性对降解萘污染物的影响规律.结果表明,催化剂Sn25对萘降解效率最高.在暗光、可见光和紫外光条件下,萘降解效率分别为13.8%、37%和98%.Sn25对萘降解稳定率(标准差率)为0.36%.利用催化剂Sn25对柴油机尾气中多环芳烃(PAHs)排放污染物光催化降解应用发现,Sn25对低苯环PAHs、中苯环PAHs和高苯环PAHs的平均催化降解效率分别为80.2%、75.4%和60.2%.表明SnO_2-TiO_2纳米纤维具有较强光催化降解多环芳烃污染物能力.
SnO2-TiO2 composite nanofibers were prepared by the coaxial electrospinning method. The crystalline phase and microstructure of SnO2-TiO2 catalysts were displayed by X-ray diffraction（ XRD） and scanning electron microscope（ SEM）. Absorption characteristics and electrochemical properties of SnO2-TiO2 catalysts were characterized by X-ray photoelectron spectroscopy（ XPS） and ultraviolet-visible spectrometry（ UV-Vis）. The corresponding influence factors on SnO2 content,light condition,temperature and repeated performance were analyzed of Naphthalene degradation rate. The test results showed that when SnO2 content was 25%,Naphthalene degradation rate was the highest. Naphthalene degradation rates were 13.8% and 37% respectively in dark and visible light conditions,and it was about 98% in UV-light condition. Naphthalene degradation stability was 0. 36%. Polycyclic aromatic hydrocarbons（ PAHs） of low benzene ring,central benzene ring and high benzene ring were reduced by catalyst sample（ Sn25） in diesel engine exhaust emission,with the degradation rates of 80.2%,75.4% and 60.2%,respectively. Therefore,it is verified that SnO2-TiO2 catalyst had better photocatalytic activity in reducing PAHs emissions from diesel engine exhaust.
作者
胡明江
虞婷婷
崔秋娜
吕春旺
HU Mingjiang;YU Tingting;CUI Qiuna;LU Chunwang(School of Energy and Building Environmental Engineering,Henan University of Urban Construction,Pingdingshan 46703)
出处
《环境科学学报》
CAS
CSCD
北大核心
2018年第9期3530-3538,共9页
Acta Scientiae Circumstantiae
基金
河南省自然科学基金(No.182300410264)
河南省科技攻关计划项目(No.182102210225)
河南省高等学校重点科研项目(No.18A470002)~~
关键词
柴油机
纳米纤维
同轴静电纺丝
光催化降解
多环芳烃
diesel engine
composite nanofibers
coaxial electrospinning
photocatalytic degradation
polycyclic aromatic hydrocarbons
