Kim Jong Beom, Park Hee Ju, Shon Ho Kyong, Cho Dong Lyun, Kim Geon-Joong, Choi Sung Woo, Kim Jong-Ho
School of Applied Chemical Engineering and The Institute for Catalysis Research, Chonnam National University, Gwangju 500-757, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3260-5. doi: 10.1166/jnn.2010.2316.
Dye wastewater flocculation using TiCl4 and FeSO4 coagulants was studied for organic removal and precipitation efficiency. Moreover, TiCl4 was assessed in a pilot-scale flocculation process to investigate organic removal and solution pH effect. A large amount of TiO2 was produced from sludge of Ti-salt flocculation in dye wastewater. This flocculation process simultaneously reduces a large amount of sludge produced from wastewater. The TiO2 nanoparticle was characterized in terms of physical and chemical properties. Results showed that 77.6% of organic matter was removed from dye wastewater when using FeSO4 as coagulant, while TiCl4 degraded 75.9% of organic matter. On the other hand, floc precipitation efficiency was better for TiCl4 if compared with FeSO4. The optimum concentration of TiCl4 for pilot-scale flocculation was found to be equal to 2.1 g/L. DWT (Dye wastewater titania) size was 15-20 nm, mainly doped with carbon atoms and exhibited a dominant anatase structure. DWT was similar to P-25 in decomposing acetaldehyde under UV-irradiation and complete photocatalytic degradation was achieved after 140 min.
研究了使用四氯化钛（TiCl4）和硫酸亚铁（FeSO4）混凝剂对染料废水进行絮凝处理时的有机物去除率和沉淀效率。此外，在中试规模的絮凝过程中对四氯化钛进行了评估，以研究有机物去除情况和溶液pH值的影响。染料废水中钛盐絮凝产生的污泥中生成了大量二氧化钛。该絮凝过程同时减少了废水产生的大量污泥。对二氧化钛纳米颗粒的物理和化学性质进行了表征。结果表明，以硫酸亚铁作为混凝剂时，染料废水中77.6%的有机物被去除，而四氯化钛降解了75.9%的有机物。另一方面，与硫酸亚铁相比，四氯化钛的絮凝沉淀效率更高。中试规模絮凝的四氯化钛最佳浓度为2.1 g/L。染料废水二氧化钛（DWT）粒径为15 - 20 nm，主要掺杂碳原子，呈现出主要的锐钛矿结构。DWT在紫外光照射下分解乙醛的性能与P - 25相似，140分钟后实现了完全光催化降解。
