TiO2纳米颗粒在水溶液中的沉积过程

D. Ariyanti, A. Purbasari, Dina Lesdantina, E. Saputro, Wei Gao
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引用次数: 0

摘要

二氧化钛纳米粒子是一种半导体光催化剂,在水处理领域有着广泛的应用。该应用程序的常见问题是将纳米颗粒从水体中分离出来并将其回收再利用。本研究通过化学加成研究了TiO2纳米粒子的聚集和沉降性能。通过改变pH、离子强度、加入罗丹明B、亚甲基橙、腐植酸等有机物质,进行5小时的实验。结果表明,pH和离子强度对TiO2的沉积过程影响较大。当溶液的pH值为1和14时,沉淀可以适当地形成,这是因为pH值接近等电点。同时,离子强度浓度为0.1 M时TiO2沉降效果最佳。在适当浓度的离子强度存在下,双电层粒子的厚度可以减小,从而使吸引力增加并发生沉降。同时,在有机物存在的情况下,罗丹明B、亚甲基橙、腐植酸对TiO2沉淀的形成影响不显著。关键词:二氧化钛,沉降,离子强度,等电点,水处理
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Sedimentation Process of TiO2 Nanoparticles in Aqueous Solution
TiO2 nanoparticles, a semiconductor photocatalyst is widely used in various applications especially for water treatment. The common problems for the application are separating the nanoparticles from the water body and recovering it to be reused. This research was conducted to investigate the aggregation and sedimentation properties of TiO2 nanoparticles via chemical addition. The experiment was carried out for 5 hours by varying the pH, ionic strength, and the addition of organic matter such as rhodamine B, methylene orange, and humic acid. The results indicate that pH and ionic strength greatly affect the TiO2 sedimentation process. Sedimentation can be formed properly when the solution is at pH 1 and 14, this happens because pH is close to the isoelectric point. Meanwhile, ionic strength with a concentration of 0.1 M gave the most optimal results in TiO2 sedimentation. In the presence of ionic strength with the appropriate concentration, the thickness of the electrical double layer particles can be reduced so the attractive force increases and sedimentation occur. Meanwhile, in the presence of organic matter, rhodamine B, methylene orange, and humic acid did not significantly affect the formation of TiO2 sedimentation.Keywords: titanium dioxide, sedimentation, ionic strength, isoelectric point, water treatment
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发文量
15
审稿时长
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