Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China.
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China; Department of Civil and Ecological Engineering, I-Shou University, Kaohsiung City, 84008, Taiwan.
J Environ Manage. 2018 Jan 15;206:565-576. doi: 10.1016/j.jenvman.2017.11.006. Epub 2017 Nov 8.
The present study examined the oxidation power of a Fe aggregates/persulfate (PS/Fe) system for the degradation of the wastewater containing mixed primary direct dyes (i.e., Sirius Gelb S-2G, Sirius Red F3B, and Sirius Turkis GL01). Results indicated that decolorization efficiency was determined by operating parameters of the PS/Fe system and the structural complexity of dye molecules. System efficiency increased with increasing persulfate and Fe dosages. Faster decolorization was observed in experiments conducted at pH < 10. The process obeyed a first-order kinetics. Slow heterogeneous reactions were observed at high initial pH (>10.5) and low PS concentration (<2 × 10 M). Inhibitory effect occurred in systems containing salts NaSO, NaCl, NaCO, and NaHPO at 1 × 10 M. The effect was suppressed when reaction temperature was raised to 55 °C. Heat enhanced not only decolorization efficiency, but also COD removal. Complete decolorization of a mixed dye containing ADMI (the American Dye Manufacture Institute) 15105 was achieved within10 min in the PS/Fe/55 °C system with an initial pH of 6.0 and dosages of 5 × 10 M NaSO and 0.5 g/L Fe. Low molecular weight intermediates including organic acids were identified. Due to a relatively low activation energy (4.68 kcaL/mol), the PS/Fe system exhibited higher efficiency at higher temperature. This study demonstrated that Fe-activated PS is a promising process for the treatment of textile wastewaters containing mixed azo direct dyes.
本研究考察了 Fe 聚集体/过硫酸盐（PS/Fe）体系的氧化能力，用于降解含有混合直接染料（即 Sirius Gelb S-2G、Sirius Red F3B 和 Sirius Turkis GL01）的废水。结果表明，脱色效率取决于 PS/Fe 体系的操作参数和染料分子的结构复杂性。随着过硫酸盐和 Fe 剂量的增加，系统效率提高。在 pH < 10 的实验中观察到更快的脱色。该过程遵循一级动力学。在初始 pH 值较高 (>10.5) 和 PS 浓度较低 (<2 × 10 -2 M) 的情况下，观察到缓慢的多相反应。在含有盐 Na 2 SO 4 、NaCl、Na 2 CO 3 和 Na 3 PO 4 的 1 × 10 -1 M 的系统中会发生抑制作用。当反应温度升高到 55°C 时，这种抑制作用会被抑制。热不仅提高了脱色效率，还提高了 COD 去除率。在 PS/Fe/55°C 体系中，初始 pH 值为 6.0，Na 2 SO 4 和 Fe 的剂量分别为 5 × 10 -1 M 和 0.5 g/L 时，10 分钟内即可完全去除 ADMI（美国染料制造商协会）15105 混合染料的颜色。鉴定出包括有机酸在内的低分子量中间产物。由于相对较低的活化能（4.68 kcaL/mol），PS/Fe 体系在较高温度下表现出更高的效率。本研究表明，Fe 激活的 PS 是处理含有混合偶氮直接染料的纺织废水的一种很有前途的工艺。
