研究报告
钟福新,林莎莎,朱义年,郭冬冬.La/Fe共掺杂TiO2纳米管阵列光催化降解制糖废水[J].环境科学学报,2011,31(7):1450-1455
La/Fe共掺杂TiO2纳米管阵列光催化降解制糖废水
- Photocatalytic degradation of sugar wastewater catalyzed by La/Fe-doped TiO2 nanotube arrays
- 基金项目：广西自然科学基金(桂科自0728216, 桂科自00832020Z)
- 作者
- 单位
- 钟福新
- 桂林理工大学化学与生物工程学院, 桂林 541004
- 林莎莎
- 桂林理工大学化学与生物工程学院, 桂林 541004
- 朱义年
- 桂林理工大学环境科学与工程学院, 广西环境工程与保护评价重点实验室, 桂林 541004
- 郭冬冬
- 桂林理工大学化学与生物工程学院, 桂林 541004
- 摘要：利用阳极氧化法在0.5%(质量分数)HF电解液中20V电压下,对抛光处理过的钛片进行阳极氧化20 min,制得有序的TiO2纳米管阵列.同时,以甲基橙为目标降解物,20 W紫外灯(λ=253.7 nm)为光源,探讨了制备La/Fe掺杂TiO2纳米管阵列的最优工艺条件,并利用SEM、XRD对La/Fe掺杂前后TiO2纳米管阵列的表面形貌和结构进行了表征,研究了La/Fe掺杂TiO2纳米管阵列对制糖废水的光催化降解条件. 结果表明,将TiO2纳米管阵列依次在0.006 mol · L-1La(NO3)3、0.018 mol · L-1 Fe(NO3)3中超声10 min条件下可获得理想、稳定的La/Fe掺杂TiO2纳米管阵列.La/Fe的掺杂不会影响TiO2纳米管阵列的表面形貌和晶型,但可显著提高TiO2纳米管阵列对甲基橙和制糖废水的紫外光催化降解效率. 光照时间和pH是影响La/Fe掺杂TiO2纳米管阵列光催化降解制糖废水的主要因素. 在强碱性条件下,La/Fe掺杂TiO2纳米管阵列对制糖废水的光催化降解效率最高,光照20 h时可达97%以上.
- Abstract：Highly ordered TiO2 nanotube arrays were firstly fabricated via electrochemical anodic oxidation of polished titanium sheets in 0.5% HF electrolyte solution at 20 V for 20 min. The preparation process of the La/Fe-doped TiO2 nanotube arrays was monitored using methyl orange as an object pollutant under irradiation of a 20 W ultraviolet lamp (λ=253.7 nm). The morphology and structure of the un-doped and La/Fe-doped TiO2 nanotube arrays were characterized by scanning electron microscopy and X-ray diffraction. The photocatalytic degradation of sugar wastewater was then studied using the La/Fe-doped TiO2 nanotube arrays as catalyst under irradiation of a 20 W ultraviolet lamp (λ=253.7 nm). The result shows that best La/Fe-doped TiO2 nanotube array catalyst could be obtained by doping the TiO2 nanotube in succession in 0.006 mol · L-1 La(NO3)3 and 0.018 mol · L-1 Fe(NO3)3 under ultrasonic treatment for 10 min. The La/Fe-doping did not change the morphology and structure of the TiO2 nanotube arrays, but could significantly increase the photocatalytic degradation efficiency of methyl orange and sugar wastewater. The photocatalytic degradation of sugar wastewater using the La/Fe-doped TiO2 nanotube arrays as catalyst was mainly affected by the irradiation time and pH. Under strong alkaline conditions and irradiation for 20 h, the photocatalytic degradation efficiency of sugar wastewater reached the highest value of >97%.
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