Mn掺杂TiO_2负载木质活性炭纤维可见光降解甲醛的研究

Visible Light Photodegradation of Formaldehyde with Mn-doped TiO_2 Loaded on Wood-based Activated Carbon Fibers

以木质活性炭纤维为载体制备Mn掺杂TiO2负载木质活性炭纤维光催化复合材料(Mn/TiO2-WACFs),考察Mn掺杂浓度、光照时间、光照强度、甲醛初始质量浓度和样品用量对可见光下甲醛降解率的影响.研究表明:随着光照时间的延长、Mn/TiO2-WACFs用量的增多和初始甲醛质量浓度的增大,Mn/TiO2-WACFs对甲醛的降解率逐渐提高;随着Mn掺杂浓度和光照强度的增大,Mn/TiO2-WACFs对甲醛的降解率表现出先增大后减小的趋势.在65,W节能灯光照时间4,h、甲醛初始质量浓度9.38,mg/L、n(Mn)∶n(Ti)=1∶100、Mn/TiO2-WACFs用量0.22,g的条件下,甲醛降解率高达91%,.

Mn-doped TiO2 loaded on wood-based activated carbon fibers（Mn/TiO2-WACFs）was prepared with WACFs as the support. The effects of Mn doping concentration,lighting time,illumination intensity,initial formaldehyde concentration and Mn/TiO2-WACFs doses on formaldehyde degradation rate under visible were studied. The results showed that when increasing lighting time,Mn/TiO2-WACFs doses and initial formaldehyde concentration,the degradation rate of formaldehyde increased gradually;when increasing Mn doping concentration and illumination intensity,the degradation rate of formaldehyde first increased and then decreased. When 65W spiral energy saving lamp lighting reached 4h,the initial formaldehyde concentration was 9.38mg/L,n（Mn）∶n（Ti）=1∶100 and Mn/TiO2-WACFs dose was 0.22g,the degradation rate of formaldehyde reached 91%.