El-Shafey Shaymaa E, Obada Mohammed K, El-Shamy A M, Mohamed Wael S
Surface Chemistry and Catalysis Lab., Physical Chemistry Department, National Research Centre, El-Bohouth St. 33, Dokki, P.O. 12622, Giza, Egypt.
Egyptian Projects Operation and Maintenance Co. (EPROM), Petroleum Complex, Alexandria, Egypt.
Sci Rep. 2024 Oct 30;14(1):26095. doi: 10.1038/s41598-024-74680-2.
The removal of heavy metals, such as lead, from industrial wastewater is imperative due to their detrimental effects on both human health and the environment. This study delves into investigating the feasibility of employing a novel adsorbent, specifically a silica/klucel nanocomposite, for effectively extract lead from industrial effluents. The synthesis of this nanocomposite involved a simple and cost-effective method, combining silica nanoparticles with klucel. XRD, FTIR, E-SEM, Raman, and N gas adsorption at - 196 °C tools were employed to prospect the formation of silica/klucel nanocomposite. Outstandingly, treating 50 ml of 50 mg/l of lead with 10 mg of adsorbent exhibited rapid removal, which reached a maximum (95%) at 60 min contact time. The resulting composite demonstrated remarkable adsorption capabilities, primarily attributed to two factors: the expansive surface area of silica nanoparticles 139.1 m/g and the porous structure provided by klucel. Through batch adsorption experiments, the nanocomposite's proficiency in removing lead ions from aqueous solutions became evident. The kinetics of the adsorption process were found to adhere closely to a pseudo-second-order model, hinting at chemical adsorption as the rate-determining step. Langmuir isotherm model revealed that lead ions tend to form a monolayer on the surface of the nanocomposite and the maximum adsorption capacity (q) was 63.938 mg/g. Additionally, the nanocomposite, exhibited notable stability and could be reused multiple times, where 65% removal efficiency was announced until the 7th cycle without significant degradation in performance. In summary, the silica/klucel nanocomposite emerges as a promising and eco-friendly adsorbent for removing lead from industrial effluents. Its efficient performance and sustainability offer a compelling solution to combat heavy metal contamination, thereby contributing to environmental preservation and human well-being.
由于重金属（如铅）对人类健康和环境都有不利影响，因此从工业废水中去除它们势在必行。本研究深入探讨了使用新型吸附剂（特别是二氧化硅/羟丙基纤维素纳米复合材料）从工业废水中有效提取铅的可行性。这种纳米复合材料的合成采用了一种简单且经济高效的方法，即将二氧化硅纳米颗粒与羟丙基纤维素结合。利用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜（E-SEM）、拉曼光谱以及在-196°C下的N₂气体吸附等工具来探究二氧化硅/羟丙基纤维素纳米复合材料的形成情况。值得注意的是，用10毫克吸附剂处理50毫升50毫克/升的铅溶液时，铅的去除速度很快，在接触60分钟时达到最大值（95%）。所得复合材料表现出显著的吸附能力，这主要归因于两个因素：二氧化硅纳米颗粒的大表面积（139.1平方米/克）以及羟丙基纤维素提供的多孔结构。通过批量吸附实验，该纳米复合材料从水溶液中去除铅离子的能力变得明显。吸附过程的动力学被发现紧密遵循准二级模型，这表明化学吸附是速率决定步骤。朗缪尔等温线模型表明，铅离子倾向于在纳米复合材料表面形成单分子层，最大吸附容量（q）为63.938毫克/克。此外，该纳米复合材料表现出显著的稳定性，可以重复使用多次，直到第7个循环时仍宣布有65%的去除效率，且性能没有明显下降。总之，二氧化硅/羟丙基纤维素纳米复合材料是一种有前途的环保吸附剂，可用于从工业废水中去除铅。其高效的性能和可持续性为对抗重金属污染提供了一个有吸引力的解决方案，从而有助于环境保护和人类福祉。
