Mansouriieh Nafiseh, Reza Sohrabi Mahmoud, Pouramir Vajargah Rogayyeh, Roudbaraki Hasan
Young Researchers and Elite Club, Tabriz Branch, Islamic Azad University, Tabriz, Islamic Republic of Iran E-mail:
Department of Chemistry, Islamic Azad University, North Tehran Branch, P.O. Box 1913674711, Tehran, Islamic Republic of Iran.
Water Sci Technol. 2017 Oct;76(7-8):1992-2002. doi: 10.2166/wst.2017.339.
This study synthesized sulfanilic acid (SA)-modified TiO nanocomposites and used them as an effective photocatalyst for Direct yellow 86 diazo dye removal from aqueous solution. This novel nanocomposite (SA/TiO) was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy and X-ray diffraction. The results showed the formation of SA/TiO nanocatalyst. The photocatalytic activity of the modified photocatalyst was examined by degradation of Direct yellow 86 (GE) under UV and visible light. The effects of five parameters, the concentration of GE, dosage of SA/TiO nanocomposite, UV light irradiation intensity, pH and visible light illumination, on the removal of GE using SA/TiO nanocomposite were studied. The highest GE removal was determined at pH of 9, nanocomposite dosage of 0.15 g/l and initial GE concentration of 50 mg/l at the constant temperature of 25 °C. However, the results showed that the GE removal rate increased as the UV light intensity increased. In addition, an enhancement in the photodegradation rate was observed with visible light illumination. The adsorption trends of GE at various initial concentrations followed the Langmuir isotherm model.
本研究合成了磺胺酸（SA）改性的TiO纳米复合材料，并将其用作从水溶液中去除直接黄86重氮染料的有效光催化剂。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜和X射线衍射对这种新型纳米复合材料（SA/TiO）进行了表征。结果表明形成了SA/TiO纳米催化剂。通过在紫外光和可见光下降解直接黄86（GE）来考察改性光催化剂的光催化活性。研究了GE浓度、SA/TiO纳米复合材料用量、紫外光照射强度、pH值和可见光照射这五个参数对使用SA/TiO纳米复合材料去除GE的影响。在25℃恒温下，pH为9、纳米复合材料用量为0.15 g/l、初始GE浓度为50 mg/l时，GE去除率最高。然而，结果表明，随着紫外光强度的增加，GE去除率提高。此外，可见光照射下光降解速率有所增强。不同初始浓度下GE的吸附趋势遵循朗缪尔等温线模型。
