El-Sayed Wessam N, Elwakeel Khalid Z, Shahat Ahmed, Awual Md Rabiul
Chemistry Department, Faculty of Science, Suez University Suez 43518 Egypt
Department of Environmental Science, Faculty of Science, Port-Said University Port-Said Egypt.
RSC Adv. 2019 May 7;9(25):14167-14175. doi: 10.1039/c9ra00383e.
Ligand-functionalized nanomaterials exhibit great potential for the removal of hazardous substances from the environment and industrial wastewater. In this work, a composite nanosphere material was fabricated using mesoporous silica and organic ligand, and employed for the efficient detection and subsequent removal of toxic sulfanilamide (SNA) from waste samples. The organic ligand 2-naphthol was successfully conjugated onto the mesoporous nanospheres, which then captured SNA under suitable conditions. A naked-eye color change was observed even when a trace amount of SNA interacted with the material, which is the most promising advantage of the fabricated material. A low limit of detection and quantification limit were also determined, and the new nanosphere material revealed the ultra-trace detection performance of 0.27 μg L of SNA in aqueous media. The effect of solution pH, competing ions, color optimization and initial concentration of SNA on the nanosphere material was investigated under the optimum conditions. The nanosphere material exhibited rapid adsorption properties, and its maximum adsorption capability approached 79.20 mg g. Several compounds were examined as common interfering substances including vanillin, glucose, lactose, starch and sucrose, which did not adversely interfere in both the detection and adsorption systems using the proposed nanosphere material. The data emphasized that the proposed material is highly suitable for the capture of SNA from contaminated water based on its selectivity, sensitivity, cost-effectiveness and eco-friendly approach. The results also indicate that this nanosphere material will attract attention from researchers for the efficient and selective capture of the toxic SNA.
配体功能化纳米材料在从环境和工业废水中去除有害物质方面展现出巨大潜力。在这项工作中，使用介孔二氧化硅和有机配体制备了一种复合纳米球材料，并将其用于从废物样品中高效检测及随后去除有毒的磺胺（SNA）。有机配体2 - 萘酚成功地共轭到介孔纳米球上，然后在合适条件下捕获SNA。即使痕量的SNA与该材料相互作用，也能观察到肉眼可见的颜色变化，这是所制备材料最具前景的优势。还确定了低检测限和定量限，这种新型纳米球材料在水介质中对SNA的超痕量检测性能为0.27 μg/L。在最佳条件下研究了溶液pH值、竞争离子、颜色优化以及SNA初始浓度对纳米球材料的影响。该纳米球材料表现出快速吸附性能，其最大吸附容量接近79.20 mg/g。考察了几种化合物作为常见干扰物质，包括香草醛、葡萄糖、乳糖、淀粉和蔗糖，它们在使用所提出的纳米球材料的检测和吸附系统中均未产生不利干扰。数据强调，基于其选择性、灵敏度、成本效益和环保方法，所提出的材料非常适合从受污染水中捕获SNA。结果还表明，这种纳米球材料将因其对有毒SNA的高效选择性捕获而吸引研究人员的关注。
