Supercritical water catalytic oxidation of dye wastewater: catalytic oxidation effect, oxidation mechanism and transformation characteristics of organic matters

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2025-03-04 DOI:10.1002/jctb.7834

Rui Bao, Shuzhong Wang, WenLi Feng, Jiaqi Feng, Tao Wang

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引用次数: 0

Abstract

Background

Dye wastewater has complex composition and strong toxicity, and effects large water quality changes. Ensuring its reasonable and efficient treatment has always been a challenging issue for the dye industry. This study used supercritical water catalytic oxidation technology to harmlessly treat dye wastewater. By adding different types of metal oxide and nitrates, and changing the type of alcohol in the system, the effects of these factors on the catalytic oxidation reaction of dye wastewater under supercritical conditions were studied. Additionally, the mechanism of the oxidation process and the characteristics of organic matter transformation also were explored.

Results

The oxides of copper (CuO) and cerium (CeO₂) have better oxidation effects on supercritical water oxidation, with chemical oxygen demand (COD) removal rates and ammonium (NH₃)-N removal rates of 99.29% and 95.99%, respectively. The COD and NH₃-N removal rates of dye wastewater using copper [Cu(NO₃)₂] and iron [Fe(NO₃)₃] nitrates can reach 99.36% and 66.41%, respectively. The catalytic effect of nitrate on the degradation of dye wastewater consists of two parts: the effect of metal ions and the effect of NO₃ ions. The COD removal rate of methanol wastewater co-oxidation can reach up to 99.32%. The hydrogen (H) atoms in monohydric alcohols are generally more easily attacked by active free radicals than H atoms in polyhydric alcohols, so more HO₂· free radicals can be produced, which promotes the removal of COD and NH₃-N in dye wastewater.

Conclusion

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染料废水的超临界水催化氧化：催化氧化效果、氧化机理及有机物转化特性

背景染料废水成分复杂，毒性强，对水质变化影响较大。如何对其进行合理、高效的处理一直是染料工业面临的难题。采用超临界水催化氧化技术对染料废水进行无害化处理。通过添加不同类型的金属氧化物和硝酸盐，以及改变体系中醇的类型，研究了这些因素对超临界条件下染料废水催化氧化反应的影响。此外，还探讨了氧化过程的机理和有机质转化的特点。结果铜（CuO）和铈（CeO2）的氧化物在超临界水氧化中具有较好的氧化效果，化学需氧量（COD）去除率为99.29%，铵(NH3)-N去除率为95.99%。硝酸铜[Cu(NO3)2]和硝酸铁[Fe(NO3)3]对染料废水的COD和NH3-N去除率分别达到99.36%和66.41%。硝酸盐对染料废水降解的催化作用由两部分组成：金属离子的作用和NO3离子的作用。甲醇废水共氧化的COD去除率可达99.32%。单水醇中的氢(H)原子一般比多水醇中的H原子更容易受到活性自由基的攻击，因此能产生更多的HO2·自由基，促进了染料废水中COD和NH3-N的去除。结论超临界水催化氧化技术在染料废水处理中具有较大的应用潜力。©2025化学工业学会（SCI）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.