Photocatalytic performance of electrospun CNT/TiO2 nanofibers in a simulated air purifier under visible light irradiation
Photocatalytic performance of electrospun CNT/TiO2 nanofibers in a simulated air purifier under visible light irradiation
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DOI：
10.1007/s11356-016-7348-z
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发表时间：
2016-11-01
影响因子：
5.8
通讯作者：
Sagawa, Takashi
中科院分区：
文献类型：
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作者：
Wongaree, Mathana;Chiarakorn, Siriluk;Sagawa, Takashi
以静电纺丝碳纳米管/二氧化钛（CNT/TiO 2）纳米纤维为可见光活性光催化剂，研究了可见光下气相苯的光催化降解。CNT/TiO 2纳米纤维通过静电纺丝CNT/聚（乙烯基吡咯烷酮）（PVP）溶液，然后通过在450 A ℃下煅烧除去PVP来制备。CNT/TiO 2的摩尔比固定为0.05：1（重量），PVP溶液中负载的CNT/TiO 2的量在30和60%wt之间变化。CNT/TiO 2纳米纤维具有高的比表面积（116 m2/g），显著高于TiO 2纳米纤维的比表面积（44 m2/g）。在可见光照射下，通过对1 × 10（-5）M亚甲基蓝（MB）染料（水溶液）的脱色和对100 ppm气态苯的降解，研究了CNT/TiO 2纳米纤维的光催化性能。在可见光照射下，50-CNT/TiO 2纳米纤维（由基于PVP的50%wt CNT/TiO 2的纺丝溶液制造的煅烧CNT/TiO 2纳米纤维）具有比其他CNT/TiO 2纳米纤维和原始TiO 2纳米纤维（15%）更高的MB降解效率（58%）。在模拟空气净化器系统中，采用50-CNT/TiO 2纳米纤维作为光催化剂，在可见光照射下对气态苯进行光催化降解。与MB结果相似，50-CNT/TiO 2纳米纤维对气态苯的降解效率（52%）高于其他CNT/TiO 2纳米纤维和原始TiO 2纳米纤维（18%）。CNT/TiO 2纳米纤维具有较大的比表面积和较低的带隙能的协同效应，表现为较强的吸附能力和较强的可见光吸收。本研究中制备的CNT/TiO 2复合材料具有用于空气净化器的潜力，可以以更少的能量提高空气处理效率。
The photocatalytic treatment of gaseous benzene under visible light irradiation was developed using electrospun carbon nanotube/titanium dioxide (CNT/TiO2) nanofibers as visible light active photocatalysts. The CNT/TiO2 nanofibers were fabricated by electrospinning CNT/poly(vinyl pyrrolidone) (PVP) solution followed by the removal of PVP by calcination at 450 A degrees C. The molar ratio of CNT/TiO2 was fixed at 0.05:1 by weight, and the quantity of CNT/TiO2 loaded in PVP solution varied between 30 and 60 % wt. CNT/TiO2 nanofibers have high specific surface area (116 m(2)/g), significantly higher than that of TiO2 nanofibers (44 m(2)/g). The photocatalytic performance of the CNT/TiO2 nanofibers was investigated by decolorization of 1 x 10(-5) M methylene blue (MB) dye (in water solution) and degradation of 100 ppm gaseous benzene under visible light irradiation. The 50-CNT/TiO2 nanofibers (calcined CNT/TiO2 nanofibers fabricated from a spinning solution of 50 % wt CNT/TiO2 based on PVP) had higher MB degradation efficiency (58 %) than did other CNT/TiO2 nanofibers and pristine TiO2 nanofibers (15 %) under visible light irradiation. The photocatalytic degradation of gaseous benzene under visible light irradiation on filters made of 50-CNT/TiO2 nanofibers was carried out in a simulated air purifier system. Similar to MB results, the degradation efficiency of gaseous benzene by 50-CNT/TiO2 nanofibers (52 %) was higher than by other CNT/TiO2 nanofibers and pristine TiO2 nanofibers (18 %). The synergistic effects of the larger surface area and lower band gap energy of CNT/TiO2 nanofibers were presented as strong adsorption ability and greater visible light adsorption. The CNT/TiO2 nanofiber prepared in this study has potential for use in air purifiers to improve air treatment efficiency with less energy.