Binding of Lignin Nanoparticles at Oil-Water Interfaces: An Ecofriendly Alternative to Oil Spill Recovery
Binding of Lignin Nanoparticles at Oil-Water Interfaces: An Ecofriendly Alternative to Oil Spill Recovery
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DOI：
10.1021/acsami.8b17748
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发表时间：
2018-12-12
影响因子：
9.5
通讯作者：
Bharti, Bhuvnesh
中科院分区：
文献类型：
--
作者：
Lee, Jin Gyun;Larive, Luke L.;Bharti, Bhuvnesh
用于管理大规模漏油的合成两亲性物质对环境和海洋生物有有毒影响。开发新的溢油回收技术对于最大限度地减少此类灾害对环境和生态的影响至关重要。在这里，我们展示了木质素纳米颗粒和1-戊醇的混合物形成了一种生物相容性的替代品，可以替代用于漏油回收的不可降解的合成两亲化合物。混合物中的戊醇会产生初始的Marangoni流，并将泄漏的石油限制在水面上的一层厚厚的浮油中。当酒精溶解时，木质素纳米颗粒不可逆地吸附到油水界面上。我们发现，木质素纳米颗粒对油水界面的吸附是由颗粒与界面之间的静电作用、范德华作用和疏水作用共同控制的。这些相互作用，再加上吸附在油水界面上的纳米颗粒之间的粒子间静电斥力，推动了亚单分子层的形成。在戊醇的增溶作用下，由于压应力作用于界面，亚单分子层转变为一层堵塞的纳米颗粒薄膜。这种木质素纳米颗粒的界面层限制了石油的重新扩散，并将石油锁定在其受限状态。油与纳米颗粒界面层的聚集状态有助于使用机械方法安全地清除泄漏的油。这项研究提出了一种新的原理，将重醇和生物相容纳米颗粒的混合物用于石油聚集应用，从而为石油泄漏回收提供了一种生态友好的替代方案。
Synthetic amphiphiles used for managing large-scale oil spills have a toxic impact on the environment and marine life. Developing new oil spill recovery technologies is critical to minimize the environmental and ecological impact of such disasters. Here, we show that a mixture of lignin nanoparticles and 1-pentanol forms a biocompatible alternative to nondegradable, synthetic amphiphiles used for oil spill recovery. The pentanol in the mixture generates initial Marangoni flow and confines the spilled oil into a thick slick on the surface of water. While the alcohol solubilizes, lignin nanoparticles irreversibly adsorb onto the oil water interface. We find that the lignin nanoparticle adsorption to the oil water interface is governed by a combination of electrostatic, van der Waals, and hydrophobic interactions between the particles and the interface. These interactions, combined with interparticle electrostatic repulsion between nanoparticles adsorbed at the oil water interface, drive the formation of a submonolayer. The submonolayer transforms into a film of jammed nanoparticles due to compressive stress acting on the interface upon the solubilization of pentanol. This interfacial layer of lignin nanoparticles restricts oil from respreading and locks the oil in its confined state. The herded state of the oil with the interfacial layer of nanoparticles facilitates safe removal of the spilled oil using mechanical methods. The study presents a new principle of using a mixture of heavy alcohol and biocompatible nanoparticles for oil herding applications, thus providing an ecofriendly alternative to oil spill recovery.