Comparative Studies on Photo-Degradation of Landfill Leachate Using TiO2 Doped Fe2O3 and Cu

IF 1.7 4区工程技术 Q3 ENGINEERING, CIVIL

Iranian Journal of Science and Technology, Transactions of Civil Engineering Pub Date : 2024-08-30 DOI:10.1007/s40996-024-01577-5

N. Thangam, V. Lavanya, S. Suriya

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Abstract

Leachate generation is a serious problem for groundwater quality in and around municipal solid waste dumpsites. The degradation of leachate water contaminants using TiO₂-doped nanocomposites as photocatalysts is studied. The Fe₂O₃-doped TiO₂ and Cu-doped TiO₂ nanocomposites are synthesized by the sol–gel method to degrade landfill leachate water contaminants. The impregnation of Fe₂O₃ and Cu into TiO₂ aims to enhance the separation and migration of electron–hole pairs, increase the generation of reactive oxygen species, and ultimately improve the efficiency of photocatalytic degradation of contaminants in landfill leachate.SEM, XRD, EDX, FITR, and UV-DRS are used to analyze the surface morphology, particle size, elemental composition, and band gap energy of the prepared photocatalysts. The XRD results show Fe₂O₃/TiO₂ and Cu/TiO₂ have crystalline sizes of 40.03 nm and 18.15 nm, respectively. The surface morphologies of Fe₂O₃/TiO₂ have a non-uniform size and a spherical shape, but Cu/TiO₂ are tiny, spherical, and slightly clustered. The bandgap energies of Fe₂O₃/TiO₂ and Cu/TiO₂ are 3.75 eV and 3.87 eV, respectively. The optimal parameters, such as pH, catalyst dosage, and light intensity, are studied to determine the degradation of chemical oxygen demand (COD) and color removal. Results revealed that in the trapezoidal reactor, the maximum decolorization of 67%, 90%, and 78% and COD removal of 63%, 81%, and 72% are achieved for TiO₂, Fe₂O₃/TiO₂, and Cu/TiO₂ photocatalysts, respectively, at 3.5 h. Similarly, for the cylindrical reactor, color removal of 60%, 80%, and 70% and COD removal of 55%, 72%, and 65% are achieved for TiO₂, Fe₂O₃/TiO₂, and Cu/TiO₂ photocatalysts, respectively, at 3 h. The results of photocatalytic degradation of the leachate ensures the efficiency of the reactor and it is reused for several times to attain the maximum stability for real-time application in the treatment of landfill leachate.

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使用掺杂 Fe2O3 的二氧化钛和铜对垃圾填埋场渗滤液进行光降解的比较研究

渗滤液的产生是城市固体废物倾倒场及其周围地区地下水质量的一个严重问题。本研究采用掺杂 TiO2 的纳米复合材料作为光催化剂，对渗滤液中的污染物进行降解。采用溶胶-凝胶法合成了掺杂 Fe2O3 的 TiO2 和掺杂 Cu 的 TiO2 纳米复合材料，用于降解垃圾渗滤液中的污染物。在 TiO2 中浸渍 Fe2O3 和 Cu 的目的是增强电子-空穴对的分离和迁移，增加活性氧的生成，最终提高光催化降解垃圾渗滤液中污染物的效率。SEM、XRD、EDX、FITR 和 UV-DRS 用于分析制备的光催化剂的表面形貌、粒度、元素组成和带隙能。XRD 结果显示，Fe2O3/TiO2 和 Cu/TiO2 的结晶尺寸分别为 40.03 nm 和 18.15 nm。Fe2O3/TiO2 的表面形貌大小不均匀，呈球形，而 Cu/TiO2 的表面形貌微小，呈球形，略有团聚。Fe2O3/TiO2 和 Cu/TiO2 的带隙能分别为 3.75 eV 和 3.87 eV。研究了 pH 值、催化剂用量和光照强度等最佳参数，以确定化学需氧量（COD）的降解和颜色的去除。结果显示，在梯形反应器中，TiO2、Fe2O3/TiO2 和 Cu/TiO2 光催化剂在 3.5 小时内的最大脱色率分别为 67%、90% 和 78%，COD 去除率分别为 63%、81% 和 72%。同样，对于圆柱形反应器，TiO2、Fe2O3/TiO2 和 Cu/TiO2 光催化剂在 3 小时内的色度去除率分别为 60%、80% 和 70%，COD 去除率分别为 55%、72% 和 65%。渗滤液的光催化降解结果确保了反应器的效率，并可重复使用多次，以达到最大的稳定性，实时应用于垃圾填埋场渗滤液的处理。

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来源期刊

Iranian Journal of Science and Technology, Transactions of Civil Engineering ENGINEERING, CIVIL-

CiteScore

3.30

自引率

11.80%

发文量

203

期刊介绍： The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.