摘要
采用介质阻挡放电等离子体结合TiO2光催化剂降解甲醛气体,在不同的放电电压下考察了催化剂载体、焙烧温度以及过渡金属离子掺杂对甲醛降解效果的影响.结果表明:TiO2/γ-Al2O3光催化剂的填充能显著提高甲醛的降解率和产物的选择性;甲醛降解率随放电电压的升高而增大,随焙烧温度的升高而下降,当焙烧温度为400℃、放电电压为20.7 kV时,甲醛降解率高达83.8%;放电等离子体驱动锐钛矿型TiO2对甲醛的降解效率要优于驱动金红石型TiO2;在TiO2上掺杂Mn离子后,甲醛降解率比等离子体单独作用时提高了45.7%,同时降解产物中CO与CO2质量浓度之比以及O3生成量分别降低了42.5%和39.4%.
This paper deals with the photocatalytic degradation of formaldehyde driven by dielectric barrier discharge plasma,with TiO2 as the photocatalyst,and reveals the effects of discharge voltage,catalyst support,calcination temperature and transition metal ion doping on the degradation efficiency.The results indicate that photocata-lyst TiO2/γ-Al2O3 significantly improves the degradation rate of formaldehyde and the product selectivity,that the degradation rate increases with the discharge voltage but decreases with the increases in calcination temperature,that the degradation rate is up to 83.8% at a discharge voltage of 20.7 kV and a calcination temperature of 400 ℃,that the plasma-driven anatase TiO2 system is of a degradation efficiency higher than that of the plasma-driven rutile one,that,with the doping of Mn ions,the degradation rate of the plasma-driven system increases by 45.7%,while the mass concentration ratio of CO to CO2 as well as the amount of O3 respectively decrease by 42.5% and 39.4%.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第1期68-73,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技计划项目(2008B030302030)
广东省教育部产学研结合项目(2007B090400069)
关键词
介质阻挡放电
等离子体
光催化
甲醛
Mn离子掺杂
dielectric barrier discharge
plasma
photocatalysis
formaldehyde
Mn ion doping
