The smart superhydrophobic surface with super-oleophilic features is key to fundamental research and practical applications for cleaning an oil spill from the oil-water mixture. Oil contamination has a detrimental effect on the environment, eventually adversely affecting the aquatic ecosystem and potable water. Herein, Cdots coated cotton (CDC), having a smart affair with oil, was developed for selective oil separation application from water. The guava leaf-derived Cdots was synthesized from the guava leaves extraction under microwave irradiation. As synthesized Cdots (contains ~92 % carbon) and CDC exhibited excellent superhydrophobic characteristics with water contact angles ~151° and ~148°, respectively. CDC endowed superior oil absorbing capability and the ability to remove oils (light and heavy oils) from contaminated water instantly in diverse environments. CDC was tolerant to harsh chemical and environmental insults, which emphasizes the outstanding robustness and durability of CDC. Further, Cdots was employed to separate crude oil from the oil-water mixture by absorption and filtration method as proof of concept application. The maximum separation efficiency was about 98 % with around 1291 wt% oil absorption capacity at room temperature. The study contains a complete green methodology of the biomass-derived synthesis of Cdots and their applications in the energy-efficient and eco-friendly cleanup of oil spills.

具有超亲油特性的智能超疏水表面是从油水混合物中清除溢油的基础研究和实际应用的关键。石油污染对环境产生不利影响，最终对水生生态系统和饮用水产生不利影响。在此，Cdots 涂层棉 (CDC) 与油有密切的关系，被开发用于从水中选择性油分离应用。番石榴叶衍生的 Cdots 是在微波辐射下从番石榴叶提取物中合成的。合成的碳点（含约 92% 碳）和 CDC 表现出优异的超疏水特性，水接触角分别为约 151° 和约 148°。CDC 赋予了卓越的吸油能力和在不同环境中立即从受污染的水中去除油（轻油和重油）的能力。CDC 能够耐受苛刻的化学和环境损害，这强调了 CDC 出色的稳健性和耐用性。此外，Cdots 用于通过吸收和过滤方法从油水混合物中分离原油，作为概念应用的证明。在室温下，最大分离效率约为 98%，吸油量约为 1291 wt%。该研究包含一个完整的绿色方法，用于 Cdots 的生物质衍生合成及其在石油泄漏的节能和环保清理中的应用。它强调了 CDC 出色的稳健性和耐用性。此外，Cdots 用于通过吸收和过滤方法从油水混合物中分离原油，作为概念应用的证明。在室温下，最大分离效率约为 98%，吸油量约为 1291 wt%。该研究包含一个完整的绿色方法，用于 Cdots 的生物质衍生合成及其在石油泄漏的节能和环保清理中的应用。它强调了 CDC 出色的稳健性和耐用性。此外，Cdots 用于通过吸收和过滤方法从油水混合物中分离原油，作为概念应用的证明。在室温下，最大分离效率约为 98%，吸油量约为 1291 wt%。该研究包含一个完整的绿色方法，用于 Cdots 的生物质衍生合成及其在石油泄漏的节能和环保清理中的应用。