碘敏化Bi_4Ti_3O_(12)/TiO_2光催化剂的制备及催化性能研究
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摘要
论文以Bi(NO3)3·5H2O和Ti02为原料沉淀法合成含铋和钛的前躯体,高温煅烧制得Bi4Ti3O12/Ti02异质结,然后用HI酸处理后得到碘掺杂的Bi4Ti3Oi2/TiO2光催化剂。研究了样品在200W氙灯作用下对苯酚的光降解性能。论文还采用溶剂热法制备了BiOI/TiO2光催化剂,研究了样品在500W氙灯照射下对苯酚降解的光催化活性。具体内容如下：
1.以Bi(NO3)3·5H2O为原料,采用沉淀法在Ti02颗粒表面制备出铋前躯体沉淀Bi6O6(OH)2(NO3)4·2H2O,经高温煅烧(500℃)得到Bi4Ti3O12/TiO2异质结,然后用HI酸处理,合成了一种新颖的I掺杂i4Ti3012/TiO2光催化剂。采用XRD、 HRTEM、DRS、XPS等手段对样品进行了表征,并以苯酚溶液为模型污染物评价了I/Bi4Ti3O12/TiO2复合光催化剂的催化活性。系统研究了沉淀前躯体制备过程中沉淀pH值、前躯体沉淀煅烧温度等因素对I/Bi4Ti3O12/TiO2复合光催化剂的催化活性的影响。同时还考察了Bi/Ti摩尔比及I/Bi摩尔比对催化剂光催化活性的影响。结果表明：前躯体沉淀pH值为8、煅烧煅烧温度为500℃时,经HI酸处理后,I/Bi摩尔比为0.1、Bi/Ti摩尔比为0.2时,复合催化剂对苯酚的降解率达到最高,经过4h的光照,降解率达到96.9%。
2.溶剂热法合成了BiOI敏化TiO2光催化剂,采用XRD、DRS、HRTEM等手段对样品进行了表征,研究了其对苯酚的光催化降解性能,考察了BiOI负载量对BiOI/TiO2样品光催化性能的影响。研究表明：BiOI/TiO2的光催化活性明显高于纯BiOI和TiO2,并且负载量对其光催化活性影响显著,BiOI的负载量为3.0%(摩尔比)时,催化剂对苯酚降解效率最高,经过4h的光照,降解效率为98.2%。
In this article, iodine doped Bi4Ti3O12/TiO2photocatalyst was successfully synthesized via the reaction of HI acid with Bi4TisO12/TiO2hetero structure which was obtained through annealing precipitation precursor containing bismuth and titanium. The photocatalytic activities of photocatalyst were evaluated using phenol as a model pollutant under200W Xe lamp. Furthermore, BiOI/TiO2photocatalyst was also synthesized via hydrothermal method. The photocatalytic activities were evaluated using phenol as a model pollutant under500W Xe lamp.
1. Bi6O6(OH)2(NO3)4-2H2O precipitation precursor on TiO2particles was synthesized through a precipitation method using Bi(NO3)3-5H2O as raw material. A novel iodine doped Bi4Ti3O12/TiO2photocatalyst was synthesized after annealing the precipitation precursor containing titania and followed by reacting with HI acid. X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy(DRS) and X-ray photoelectron spectroscopy(XPS) were used to characterize the products. Several factors such as pH value of bismuth precipitation precursor, annealing temperature and the influence of mole ratio of Bi/Ti and I/Bi were also studied. It revealed that when the precipitation pH value was at8, annealing temperature at500℃, and mole ratio of I/Bi was0.1, Bi/Ti mole ratio0.2, the photocatalyst synthesized behaves the best photocatalytic activity. The degradation of phenol was up to96.9%after4h irradiation.
2. BiOI sensitized TiO2photocatalyst was synthesized via hydrothermal method. The sample was investigated by X-ray powder diffraction(XRD), high resolution transmission electron microscopy(HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photocatalytic activities was evaluated using phenol as a model pollutant. The influence of amount of BiOI on catalytic activities was studied. It revealed that photocatalytic activities of BiOI/TiO2were higher than pure BiOI and TiO2, and BiOI amount greatly influenced catalytic activities of the sample. The best catalytic activity was achieved when BiOI mole ratio was3.0%, the degradation of phenol was up to98.2%after4h irradiation.
1.以Bi(NO3)3·5H2O为原料,采用沉淀法在Ti02颗粒表面制备出铋前躯体沉淀Bi6O6(OH)2(NO3)4·2H2O,经高温煅烧(500℃)得到Bi4Ti3O12/TiO2异质结,然后用HI酸处理,合成了一种新颖的I掺杂i4Ti3012/TiO2光催化剂。采用XRD、 HRTEM、DRS、XPS等手段对样品进行了表征,并以苯酚溶液为模型污染物评价了I/Bi4Ti3O12/TiO2复合光催化剂的催化活性。系统研究了沉淀前躯体制备过程中沉淀pH值、前躯体沉淀煅烧温度等因素对I/Bi4Ti3O12/TiO2复合光催化剂的催化活性的影响。同时还考察了Bi/Ti摩尔比及I/Bi摩尔比对催化剂光催化活性的影响。结果表明：前躯体沉淀pH值为8、煅烧煅烧温度为500℃时,经HI酸处理后,I/Bi摩尔比为0.1、Bi/Ti摩尔比为0.2时,复合催化剂对苯酚的降解率达到最高,经过4h的光照,降解率达到96.9%。
2.溶剂热法合成了BiOI敏化TiO2光催化剂,采用XRD、DRS、HRTEM等手段对样品进行了表征,研究了其对苯酚的光催化降解性能,考察了BiOI负载量对BiOI/TiO2样品光催化性能的影响。研究表明：BiOI/TiO2的光催化活性明显高于纯BiOI和TiO2,并且负载量对其光催化活性影响显著,BiOI的负载量为3.0%(摩尔比)时,催化剂对苯酚降解效率最高,经过4h的光照,降解效率为98.2%。
In this article, iodine doped Bi4Ti3O12/TiO2photocatalyst was successfully synthesized via the reaction of HI acid with Bi4TisO12/TiO2hetero structure which was obtained through annealing precipitation precursor containing bismuth and titanium. The photocatalytic activities of photocatalyst were evaluated using phenol as a model pollutant under200W Xe lamp. Furthermore, BiOI/TiO2photocatalyst was also synthesized via hydrothermal method. The photocatalytic activities were evaluated using phenol as a model pollutant under500W Xe lamp.
1. Bi6O6(OH)2(NO3)4-2H2O precipitation precursor on TiO2particles was synthesized through a precipitation method using Bi(NO3)3-5H2O as raw material. A novel iodine doped Bi4Ti3O12/TiO2photocatalyst was synthesized after annealing the precipitation precursor containing titania and followed by reacting with HI acid. X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy(DRS) and X-ray photoelectron spectroscopy(XPS) were used to characterize the products. Several factors such as pH value of bismuth precipitation precursor, annealing temperature and the influence of mole ratio of Bi/Ti and I/Bi were also studied. It revealed that when the precipitation pH value was at8, annealing temperature at500℃, and mole ratio of I/Bi was0.1, Bi/Ti mole ratio0.2, the photocatalyst synthesized behaves the best photocatalytic activity. The degradation of phenol was up to96.9%after4h irradiation.
2. BiOI sensitized TiO2photocatalyst was synthesized via hydrothermal method. The sample was investigated by X-ray powder diffraction(XRD), high resolution transmission electron microscopy(HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photocatalytic activities was evaluated using phenol as a model pollutant. The influence of amount of BiOI on catalytic activities was studied. It revealed that photocatalytic activities of BiOI/TiO2were higher than pure BiOI and TiO2, and BiOI amount greatly influenced catalytic activities of the sample. The best catalytic activity was achieved when BiOI mole ratio was3.0%, the degradation of phenol was up to98.2%after4h irradiation.
引文
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[2]Mills. A, Davies. R.H. Worseley, D. Water-purification by semiconductor photocalysis[J]. Chem. Soc.Rev.,1993,22:417-425
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