关键词: Geopolymers Green oxidation Photocatalysis Water wastes

Mesh : Humans Wastewater Environmental Pollutants Hydrogen Peroxide / chemistry Iron / chemistry Water Oxidation-Reduction Water Pollutants, Chemical / analysis

来  源:   DOI:10.1016/j.chemosphere.2023.140333

Abstract:
Environmental pollution is a serious threat to human health and the natural environment, and it has aroused widespread concern. One of the most effective processes in the removal of pollutants from wastewater is the Fenton reaction. This process is based on the production of highly reactive •OH radicals due to the rapid reaction between Iron ions and hydrogen peroxide under acidic conditions. The hydroxyl radical has a high oxidation potential of E°(•OH/H2O) = 2.8 V/SHE at acidic pH, so they are extremely reactive and non-selective oxidizing agent towards organic contaminants in wastewater. In order to avoid the drawbacks of a standard Fenton reaction, a photo Fenton reaction has been tested working at neutral pH in water in the removal of refractory pollutants. For the first time, a heterogeneous system was experimented, impregnating porous metakaolin-based geopolymers, obtained by using hydrogen peroxide and vegetable oil in different ratios, as foaming agents, with iron working as photocatalyst. The dirty wastewater as scrubber water (SCRW) and liquid fraction of digestate (LFD) were tested obtaining 40-90% abatement of Total Carbon Content.
摘要:
环境污染严重威胁人类健康和自然环境,引起了广泛关注。从废水中去除污染物的最有效方法之一是Fenton反应。该方法基于由于在酸性条件下铁离子和过氧化氢之间的快速反应而产生高反应性的OH自由基。在酸性pH下,羟基自由基具有E°(•OH/H2O)=2.8V/SHE的高氧化电位,因此,它们对废水中的有机污染物具有极强的反应性和非选择性氧化剂。为了避免标准Fenton反应的缺点,已经在水中的中性pH下测试了Fenton反应在去除难降解污染物中的作用。第一次,实验了一个异构系统,浸渍多孔偏高岭土基地质聚合物,通过使用不同比例的过氧化氢和植物油获得,作为发泡剂,以铁作为光催化剂。测试了作为洗涤水(SCRW)和消化物液体部分(LFD)的脏废水,总碳含量减少了40-90%。
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