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纳米TiO2光催化氧化处理直接耐晒翠蓝染料溶液 总被引:8,自引:1,他引:7
采用纳米级TiO2悬浮法光催化氧化处理直接耐晒翠蓝染料溶液,讨论了pH4值、催化剂用量、染料浓度、脱色时间等因素对脱色与降解的影响。实验发现,纳米TiO2对染料的脱色效率高、降解彻底,是一种较有前途的印染废水的处理方法。 相似文献
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利用纳米TiO2 PASS复合絮凝剂的光催化性能,处理模拟活性艳蓝染料废水和实际印染废水,研究溶液pH值、纳米TiO2 PASS投加量、煅烧温度、光照时间、H2O2用量及废水初始浓度对脱色率的影响。结果表明,纳米TiO2 PASS复合絮凝剂对模拟废水脱色的优化处理条件为:初始pH值2,纳米TiO2 PASS复合絮凝剂用量0.25 g/500 mL,光照时间120 min,复合絮凝剂煅烧温度500 ℃,H2O2用量0.4 mL/500 mL。对实际印染废水的优化处理条件为:废水pH值12.0,光照时间90 min,复合絮凝剂用量0.25 g/500 mL,H2O2用量0.4 mL/500 mL 相似文献
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复配兔毛蛋白脱色剂在印染废水脱色中的应用 总被引:1,自引:1,他引:0
介绍了兔毛蛋白脱色剂及其复配聚硅酸.硫酸铝脱色剂的制备方法,并模拟印染废水进行脱色。分析了兔毛蛋白脱色剂用量、pH值,以及复配脱色剂脱色时对pH值、聚硅酸.硫酸铝用量、兔毛蛋白脱色剂用量、脱色时间与染料浓度、染料类型对脱色效果的影响。优化得出复配脱色剂对活性艳红K-2BP模拟废水的的最佳脱色条件:兔毛蛋白脱色剂用量400mL/L,聚硅酸.硫酸铝用量4mL/L,pH值小于12,在室温(25℃)下用磁力搅拌器快速搅拌大于5min,且研究表明,该复配脱色剂对直接染料、酸性染料、分散染料脱色效果均较好。 相似文献
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采用纳米级TiO2悬浮法光催化氧化处理活性染料K-2G水溶液,讨论了pH值、TiO2用量、染料浓度、处理时间等因素对处理效果的影响.实验发现:在溶液pH值为中性、染料浓度不大、纳米TiO2用量适当的情况下光照1h,即可达到较好的降解效果.纳米TiO2对活性染料脱色效果较好、降解彻底、能将活性染料基本降解为无机物,不会造成二次污染,是一种值得深入研究并推广应用的印染废水处理方法. 相似文献
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纳米TiO2光催化氧化处理直接耐晒翠蓝染色废液 总被引:15,自引:1,他引:15
采用纳米级TiO2悬浮法光催化氧化处理直接耐晒翠蓝染液,讨论pH值、催化剂用量、染料浓度和脱色时间等因素对脱色与降解的影响。试验发现,纳米TiO2对染料的脱色效率高,降解彻底,是一种很有前途的印染废水处理方法。 相似文献
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活性染料废水具有色度高、可生化降解性差、有机物浓度高等特点,属于难处理工业废水.光催化氧化技术是高级氧化法在废水处理中的重要方法之一,氧化能力强和非选择性氧化是其主要特点,但各种工艺条件会影响光催化氧化的效果.本论文使用光催化法对活性紫5染料溶液进行氧化降解,所用催化剂为TiO2,重点讨论了溶液pH值对活性紫5染料降解率的影响,经过相关实验及讨论得知:光催化剂TiO2本身对活性紫5染料的吸附性能有限,经过30 min的吸附后,TiO2对活性紫5染料的吸附率最高只达到了 9.98%;在不同pH值条件下,TiO2都能够很好的光催化降解活性紫5染料,在pH值为2.95的条件下,经过120 min的反应后,活性紫5染料的脱色率最高可达到96.8%,且COD的去除率也高达79.3%,取得了很好的处理效果. 相似文献
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阳离子染料溶液的光催化氧化降解研究 总被引:8,自引:0,他引:8
研究了纳米TiO2降解阳离子染料时的影响因素及处理效果。试验发现,光催化氧化法对染料的降解过程是逐步进行的。光催化剂产生的高活性羟基自由基首先破坏染料分子中活性较高的生色团,然后逐步将其降解为低分子有机化合物。试验条件下,pH值对脱色效果影响最大,酸性和碱性较中性效果好。TiO2用量为1000mg/L时,效果较好。此外,随着染料浓度的增加,脱色率会迅速下降。 相似文献
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Agl/Ti02 was prepared by the deposition-precipitation method and was found to be a novel visible light driven photocatalyst. The catalyst showed high efficiency for the degradation of the nonbiodegradable azodyes reactive red K-2G, reactive brilliant red X-3B, reactive red K-2BP, and reactive yellow KD-3G under visible light irradiation (lambda > 420 nm). The catalyst's activity was maintained effectively after successive cyclic experiments under visible irradiation without the destruction of AgI. On the basis of the characterization of X-ray diffraction, X-ray photoelectron spectroscopy, and Auger electron spectroscopy, the structure of AgI loaded on TiO2 did not significantly change before and after reaction. K-2G was completely decolorized and partly mineralized. The main intermediates are the small organic acids besides CO2 and cyanuric acid, which is photostable. The *OH is the main active oxygen species in the photocatalytic reaction by the studies of electron spin resonance and the effect of radical scavengers. 相似文献
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以自然光为光源,悬浮纳米TiO2为光降解催化剂,研究了溶液pH值、酸性大红GR初始质量浓度、TiO2质量浓度、H2O2的质量浓度及光照时间对偶氮染料酸性大红GR降解的影响.结果表明悬浮纳米TiO2自然光光助催化降解酸性大红GR的适宜条件为:溶液pH值6.5,酸性大红GR初始质量浓度40 mg/L,TiO2质量浓度1.2 g/L,H2O2质量浓度5 g/L,光照时间为120 min.在此条件下,酸性大红GR降解率达75%以上,且降解反应符合一级反应动力学,其动力学常数为0.011 min-1. 相似文献
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The contribution of extracellular metabolites (EM) to the decolorant activity of newly isolated photosynthetic bacteria was observed. The decolorization process was considered to occur by two paths: photochemical decolorization by EM and photobiological decolorization by photosynthetic bacteria. In addition, the decolorization of several azo dyes by EM under black light and fluorescent light irradiation was investigated. It was found that EM were capable of decolorizing the azo dyes directly under visible light irradiation, and the overall dye decolorization followed first-order decay kinetics. Moreover, the decolorization reaction is a nonenzymatic reaction and the unknown metabolite with the decolorizing ability had an apparent molecular weight lower than 3 kDa as determined by ultrafiltration. In addition, its decolorization activity was stable even after heating sterilization at 121 degrees C for 10 min. Furthermore, the decolorization rate increased with increasing optical intensity, temperature and EM concentration, and decreased with increasing initial dye concentration. Decolorization of dye was best at pH 8. 相似文献
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