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| 在进行光催化反应实验时，每隔一定时间从反应器中取出5~7 mL溶液，离心分离后，由紫外-可见分光光度计在664 nm处测定亚甲基蓝的吸光值。图4-7是太阳光下样品对亚甲基蓝的光催化降解效果图。从图4-7可以看出，光催化降解率随反应时间增加而增加。当太阳光照射仅20 min时，亚甲基蓝降解率X高达86.68%，表明Sb2S3在太阳光下对亚甲基蓝有较高的光催化降解效率，表现出较高的可见光催化活性。由样品的紫外可见光谱图可知Sb2S3的吸收峰值范围为730~780 nm，落在可见光范围内，经计算其能带间隙为1.53 eV，故太阳光照射时，Sb2S3吸收太阳光中的可见光经激发产生空穴-电子对。吸附“溶解”在催化剂Sb2S3表面的氧俘获电子形成•O2，而空穴则将吸附在催化剂Sb2S3表面的OH-和H2 O氧化成 HO•， 生成的原子氧和氢氧自由基有很强的化学活性空穴具有很强的氧化能力[88]，能够有效地光催化降解亚甲基蓝。 |
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小油2716
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ygb123456(金币+15, 翻译EPI+1): 2010-05-06 16:14:43
During the photocatalytic reaction,remove 5 ~ 7 mL solutionat from the reactor at regular intervals.Then measured the absorbance of methylene blue by UV at 664nm after centrifugation.Figure 4-7 is the map of photocatalytic degradation of samples to methylene blue.From figure 4-7,we know that photocatalytic degradation rate is increased with the increase of the reaction time.When sunlight is only 20 mins,the degradation rate of methylene blue is up to 86.68%.This shows that Sb2S3 has a high efficiency of photocatalytic degradation to methylene blue in the sunlight,giving a high visible light photocatalytic activity.From the samples' UV-visible spectra,the absorption peak area of Sb2S3 is between 730 to 780nm which is in the visible range.After calculating,we know that the band gap is 1.53 eV.As a result,Sb2S3 can adsorbe the sunlight in the visible light and producing hole - electron pairs through irradiating by sunlight.By adsorpting the oxygen in the surface of the catalyst Sb2S3 trappes electron and produce •O2.In the same time,the hole oxidizes OH-and H2 O which adsorbe on the surface of the catalyst Sb2S3 into HO•.The atomic oxygen and hydroxyl radicals of the hole with a strong chemical activity has a strong oxidation[88].It can degradate methylene blue by photocatalysis effectively.希望有用 |
2楼2010-05-06 14:10:28
xiaomei1314
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3楼2011-04-10 16:26:15
