共查询到17条相似文献,搜索用时 961 毫秒
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制备了玻璃负载纳米Ti O_2/Si O_2光催化膜,以甲基橙溶液作为模拟废水研究了其光催化性能,分别考察了光催化膜中m(Ti O_2)∶m(Si O_2)、膜厚度、使用次数和中试扩大以及再生方式对甲基橙模拟废水降解率的影响。试验结果表明,在太阳光下照射4 h,厚度为200~400 nm的光催化膜对10 mg/L的甲基橙模拟废水降解率为84%,失活的光催化膜可用模拟风、光、酸雨和人工清洗方式再生。纳米Ti O_2/Si O_2光催化膜可应用于光催化水处理设备、建筑易清洁玻璃和太阳电池玻璃。 相似文献
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光催化降解有机磷农药的研究-玻璃弹簧负载TiO2与悬浮体系TiO2的比较 总被引:5,自引:2,他引:3
研究了利用玻璃弹簧填料为载体,采用浸涂烧结法制备负载型纳米TiO_2的过程、及其对有机磷农药敌百虫和乐果的光催化降解效果,并与单TiO_2粉末做了简单对比。结果表明:低浓度的两种有机磷农药,8W紫外灯照射2h时,无负载TiO_2对敌百虫和乐果的降解率分别为56.7%和68.6%;而玻璃弹簧负载TiO_2对二者的降解率分别为76.6%和88.7%;并且玻璃弹簧上负载的TiO_2光催化活性没有减弱,可以连续使用。同时还研究了改良型P25(P25/20)悬浮体系中的光催化降解效果,并展望了其在军事防化洗消领域中的应用前景。 相似文献
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《电镀与涂饰》2017,(22)
以溶胶-凝胶法制备了Fe~(3+)掺杂TiO_2胶体,并通过浸渍提拉法制备了Fe~(3+)掺杂TiO_2薄膜玻璃。以光催化能力(即对5 mg/L甲基橙溶液的降解率)和透光率为指标,通过正交试验考察了制备工艺对其性能的影响。增加镀膜次数可以增强薄膜玻璃的光催化性能,但是透光性降低。最优工艺为:镀膜5次、烘烤温度100℃、煅烧温度550℃、烘烤时间25 min、煅烧时间0.5 h。所得薄膜玻璃对甲基橙的光催化降解率和透光率分别达到81.8%和78.7%。对比相同条件下制备的TiO_2薄膜玻璃,Fe~(3+)掺杂TiO_2薄膜玻璃具有更好的光催化能力和更小的水接触角,意味着亲水性更好。 相似文献
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采用化学浴沉积法制备了ITO玻璃负载ZnO纳米膜,以甲基橙溶液作为模拟有机废水,研究了其光催化性能,考察了光催化时间、光催化膜循环使用次数对甲基橙模拟废水降解率的影响。试验结果表明,制备的纳米ZnO膜纯度高,结构均匀有序;在紫外光下照射4h,对甲基橙的降解率达到76.8%;简单冲洗干燥后即可重复使用,循环使用5次,对甲基橙的降解率仍良好。 相似文献
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光催化降解糖蜜酒精废水的研究 总被引:12,自引:0,他引:12
研制了对糖厂废水具有较好光催化降解性能的钨酸铋、钨酸铅、二氧化钛等一系列催化剂,比较了催化剂的光催化降解活性,发现光催化降解2h后,糖蜜酒精废水的脱色率可达90.2%,COD去除率可达72.56%。采用紫外-可见光谱、质谱对不同时间段降解的糖蜜酒精废水进行扫描分析,发现废水中难降解的主要物质——荷质比为333左右的分子随光催化降解而显著减少。 相似文献
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指数平滑法在光催化涂料效果预测中的应用 总被引:1,自引:0,他引:1
通过自制Cu-TiO2光催化涂料,针对光催化涂料降解甲醛气体效果与光催化时间的关系,利用环境测试舱模拟可见光源下的室内环境,从而获得甲醛气体浓度实测值。根据甲醛气体浓度实测值采用指数平滑法中的三次指数平滑模型,建立光催化涂料降解甲醛气体效果的模型,对其光催化效果进行预测,为光催化涂料的研究提供一定的技术支持。 相似文献
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Hana Žabová Vladimír Církva Milan Hájek 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(8):1125-1129
BACKGROUND: A continuous‐flow microwave photocatalytic reactor was set up consisting of a glass tube equipped with microwave powered mercury electrodeless discharge lamps (EDLs) coated with thin films of nanoporous titanium(IV) oxide. The effect of operational parameters on photocatalytic degradation of aqueous mono‐chloroacetic acid (MCAA) by a TiO2/UV/MW process was investigated. RESULTS: Studies were carried out at a relatively high concentration of MCAA (0.1 mol L?1), and revealed that reaction temperature and light intensity of the EDLs depend inversely on the flow rate, but that the 366 nm line intensity of EDL is directly proportional to the reaction temperature. The photodegradation of MCAA was enhanced by heating and significantly enhanced by air bubbling of the reaction mixture in the glass reservoir at laboratory temperature. The photocatalytic efficiency increased with the number of titania‐coated EDLs inserted in the glass tube reactor. CONCLUSIONS: It was found that the operational parameters (i.e. flow rate, reaction temperature, number of titania‐coated EDLs, and air bubbling) had important effects on degradation efficiency. The photocatalytic degradation of MCAA on thin films of titanium(IV) oxide in the continuous‐flow microwave photoreactor can be enhanced in the TiO2/UV/MW system. Copyright © 2009 Society of Chemical Industry 相似文献
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Influence of TiO2‐Layer Thickness of Spray‐Coated Glass Beads on Their Photocatalytic Performance 下载免费PDF全文
Susann Holze Benjamin Krüger Torsten Hoffmann Andreas Bück Michael Schwidder 《化学工程与技术》2017,40(6):1084-1091
TiO2 is a suitable catalyst for potential photocatalytic processes, e.g., in wastewater treatment. For a technical realization of such processes, the application of immobilized TiO2 in a continuous process would be desirable. However, since UV radiation has a limited penetration depth into a packed bed of pure TiO2, supporting it on UV‐transparent glass beads offers the possibility to implement continuous photocatalytic processes in a fixed‐bed reactor. Considering this fact, glass beads were coated with TiO2 powder in a fluidized‐bed reactor. The coated glass beads with varying TiO2 layer thickness were tested in the photocatalytic degradation of methylene blue, and the influence of an addition of methyl cellulose during the coating process on the photocatalytic performance was investigated. 相似文献
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本文采用sol-gel法制备了TiO2溶胶,以载玻片作为底材,用提拉法镀膜,经高温热处理后得到了TiO2纳米晶薄膜。采用XRD、SFM研究了薄膜的物相及其结构特征,UV-vis研究了薄膜的光吸收特性,以罗丹明B溶液作为目标反应物,研究了溶胶的浓度、pH值以及热处理气氛对TiO2薄膜光催化性能的影响。 相似文献
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以无机盐TiOSO4为主要原料,采用低温回流技术,于130℃下在玻璃基底上制备了TiO2纳米薄膜,研究了单离子掺杂和双离子掺杂对材料结构特性和可见光催化降解甲醛特性的影响。结果表明,选取La3+和Fe3+分别掺杂以及以2种离子共同掺杂,在可见光下对甲醛气体的降解试验中,TiO2基薄膜均表现出较高的光催化活性,尤其是在2种离子双掺杂的情况,在6 h可见光照射下,对甲醛的降解率达到90%。纳米尺度的锐钛矿结构以及离子掺杂改变TiO2材料带隙结构是该薄膜材料具有可见光催化活性的根本原因。 相似文献