Vainoris Modestas, Nicolenco Aliona, Tsyntsaru Natalia, Podlaha-Murphy Elizabeth, Alcaide Francisco, Cesiulis Henrikas
Faculty of Chemistry and Geosciences, Vilnius University, Vilnius, Lithuania.
Institute of Applied Physics of ASM, Chisinau, Moldova.
Front Chem. 2022 Sep 15;10:977980. doi: 10.3389/fchem.2022.977980. eCollection 2022.
In many countries, the textile industry remains the major contributor to environmental pollution. Untreated textile dyes discharged into water negatively impact the performance of aquatic organisms and may cause a variety of serious problems to their predators. Effective wastewater treatment is a key to reducing environmental and human health risks. In this work, the Fe/Cu catalysts were used in heterogeneous Fenton's reaction for the degradation of high concentrations of methyl orange (model azo dye) in aqueous solutions. For the first time, the catalysts were prepared onto commercial copper foams by potentiostatic electrodeposition of iron using an environmentally friendly electrolyte. The influence of electrodeposition conditions, HO concentration, dye concentration and temperature on the model dye degradation was investigated. It was revealed that both the surface area and the catalyst loading play the major role in the effective dye degradation. The experimental results involving spectrophotometric measurements coupled with total carbon and nitrogen quantification suggest that a solution containing up to 100 mg/L of methyl orange can be successfully decolorized within 90 s at 50°C using porous Fe/Cu catalyst in the presence of hydrogen peroxide that largely surpasses the current state-of-the-art performance. Already within the first 10°min, ∼ 30% of total methyl orange concentration is fully mineralized. The described process represents a cost-efficient and environmentally friendly way to treat azo dyes in aqueous solutions.
在许多国家，纺织工业仍是环境污染的主要来源。未经处理的纺织染料排放到水中会对水生生物的生存造成负面影响，并可能给它们的捕食者带来各种严重问题。有效的废水处理是降低环境和人类健康风险的关键。在这项工作中，铁/铜催化剂被用于非均相芬顿反应，以降解水溶液中高浓度的甲基橙（典型偶氮染料）。首次使用环保型电解质通过铁的恒电位电沉积将催化剂制备在商用泡沫铜上。研究了电沉积条件、羟基自由基浓度、染料浓度和温度对典型染料降解的影响。结果表明，表面积和催化剂负载量对染料的有效降解起主要作用。涉及分光光度测量以及总碳和氮定量的实验结果表明，在50℃下，使用多孔铁/铜催化剂并在过氧化氢存在的情况下，含有高达100mg/L甲基橙的溶液能够在90秒内成功脱色，这大大超越了目前的先进性能。在最初的10分钟内，约30%的甲基橙总浓度被完全矿化。所描述的过程是一种处理水溶液中偶氮染料的经济高效且环保的方法。
