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首页> 外文期刊>RSC Advances >Drastic enhancement on Fenton oxidation of organic contaminants by accelerating Fe(iii)/Fe(ii) cycle with l-cysteine
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Drastic enhancement on Fenton oxidation of organic contaminants by accelerating Fe(iii)/Fe(ii) cycle with l-cysteine

机译：用L-半胱氨酸加速Fe（III）/ Fe（II）循环对有机污染物芬顿氧化的急剧增强

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The development of a highly efficient and pH-tolerant Fenton system has been one of the most important and challenging goals in water remediation. Herein, a green natural organic ligand, L -cysteine (Cys), was innovatively introduced into Fenton's reagent to construct an excellent catalytic oxidation system. The introduction of Cys into the Fenton system expanded the effective pH range up to 6.5 and achieved a superior oxidation efficiency, representing about 70% higher removal ratio and 12 times higher reaction rate constant with methylene blue dye as the probe compound. The Cys-driven Fenton reaction presented an outstanding pH adaptability and oxidative activity compared with other common organic ligands or reducing agent-modified Fenton reactions. An investigation of the reaction mechanism indicated that the addition of Cys into the system accelerated the Fe( III )/Fe( II ) cycle, and led to a relatively steady Fe( II ) recovery, which enhances the generation of hydroxyl radicals (˙OH). The presence of Cys in the Fenton system remarkably reduced the apparent activation energy from 95.90 to 47.93 kJ mol ~(?1) . The findings from this study provide a feasible approach for a highly efficient and pH-tolerant wastewater treatment process with environmentally benign characteristics, and initiates an inspiring research domain of amino acids in the environmental catalysis field.
机译：高效和耐普顿福森系统的发展是水处理中最重要和最具挑战性的目标之一。在此，创新地将绿色天然有机配体，L-琥珀（CYS）引入FENTON试剂中以构建优异的催化氧化体系。将Cys引入FENTON系统扩展了高达6.5的有效pH范围，并实现了优异的氧化效率，其去除率高出约70％，与亚甲基蓝色染料恒定的12倍较高的反应速率恒定为探针化合物。与其他常见的有机配体或还原剂改性的芬顿反应相比，Cys-Drive Fenton反应呈现出优异的pH适应性和氧化活性。对反应机制的研究表明，在系统中加入CYS加速了Fe（III）/ Fe（II）循环，并导致了相对稳定的Fe（II）回收，增强了羟基自由基的产生（˙OH ）。 FENTON系统中的CYS的存在显着降低了95.90至47.93 kJ mol〜（α1）的表观激活能量。本研究的发现提供了一种可行的方法，可用于高效和耐润的污水处理过程，具有环境良好的特征，并在环境催化区域中启动了氨基酸的鼓舞人心的研究结构域。

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