黑砂作为一种高性价比的可见光下亚甲基蓝光修复催化剂

IF 2.4 Q3 ENVIRONMENTAL SCIENCES Discover Sustainability Pub Date : 2023-09-25 DOI:10.1007/s43621-023-00157-3
Wael A. Aboutaleb, Ibrahim M. Nassar, Ragab M. Mahmoud, A. Marey, Radwa A. El-Salamony
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引用次数: 0

摘要

亚甲基蓝(MB)是工业废水中常见的持久性有害污染物。而MB对人类和生态安全有着巨大的负面影响。这些有害物质的中和将节省大量的清洁水。本研究提出了天然丰富的黑砂作为光降解MB的催化剂。砂样在300°、400°和600°C三种温度下煅烧。用不同的显微和光谱技术分析了样品的性质。实验数据表明,样品的主要成分为sio2、fe2o3和al2o3。XRD和XPS结果表明,在400℃时煅烧形成了混合氧化物复合材料。紫外可见分析表明,样品能吸收可见光范围内的光。bs400、bs600和bs300的最大光降解率分别为975.3%、82.7%和75.7%;在可见光范围内照明2.5小时。通过光谱分析和催化剂晶格中的氧可用性讨论了所观察到的可区分的催化性能。在bs400催化剂上光降解MB染料时,用AO、t-BuOH和BQ代替BQ作为清除剂,光降解率明显下降。AO、t-BuOH和BQ对MB染料的降解率分别降至60%和70%;分别。这证明,在bs400催化剂上,超氧自由基或正空穴的产生是MB光降解的主要决定步骤,而不是羟基自由基。
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Black sand as a cost-effective catalyst for methylene blue photo-remediation under visible light
Abstract Methylene blue (MB) is commonly a persistent and perilous pollutant in industrial wastewater effluent. While MB has a massive negative effect on human and ecology safety. The neutralization of such harmful material would save a huge clean water amount. This work proposes the natural and abundant black sand as a catalyst for MB photodegradation. The sand sample was calcined at three temperatures of 300°, 400°, and 600 °C. The properties of samples were analyzed with different micro- as well as spectroscopic techniques. The experimental data revealed the sample's main composition of SiO 2 , Fe 2 O 3 , and Al 2 O 3 . XRD and XPS results proved the formation of mixed oxides composites due to calcination, especially at 400 °C. The UV– vis analysis conducted showed that samples can absorb light in the visible range. The photodegradation reached a maximum of 975.3%, 82.7%, and 75.7% for BS 400 , BS 600 , and BS 300 respectively; by illumination for 2.5 h in the visible range. The observed distinguishable catalytic performance was discussed via the spectroscopic analysis and oxygen availability in the catalyst lattice. When AO, t-BuOH, and BQ are used as scavengers instead of just BQ during the photodegradation of MB dye over BS 400 catalyst, the photodegradation rate drops significantly. The degradation % of MB dye diminished to 60%, and 70% by using AO, t-BuOH, and BQ scavengers; respectively. This proved that rather than hydroxyl radicals, superoxide radicals or positive hole production is the main determining step in MB photo-degradation over BS 400 catalyst.
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来源期刊
Discover Sustainability
Discover Sustainability sustainability research-
CiteScore
4.00
自引率
7.70%
发文量
38
审稿时长
26 days
期刊介绍: Discover Sustainability is part of the Discover journal series committed to providing a streamlined submission process, rapid review and publication, and a high level of author service at every stage. It is a multi-disciplinary, open access, community-focussed journal publishing results from across all fields relevant to sustainability research. We need more integrated approaches to social, environmental and technological systems to address some of the challenges to the sustainability of life on Earth. Discover Sustainability aims to support multi-disciplinary research and policy developments addressing all 17 of the United Nations Sustainable Development Goals (SDGs). The journal is intended to help researchers, policy-makers and the general public understand how we can ensure the well-being of current and future generations within the limits of the natural world by sustaining planetary and human health. It will achieve this by publishing open access research from across all fields relevant to sustainability. Submissions to Discover Sustainability should seek to challenge existing orthodoxies and practices and contribute to real-world change by taking a multi-disciplinary approach. They should also provide demonstrable solutions to the challenges of sustainability, as well as concrete suggestions for practical implementation, such as how the research can be operationalised and delivered within a wide socio-technical system.
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