Multifunctional chemically powered micromotors were fabricated from the airborne contaminant carbon soot (CS) for environmental remediation following two approaches: first, by physical deposition of catalytic platinum (Pt) and magnetic nickel (Ni) nanoscale films of ∼110 nm and ∼100 nm, respectively, on CS (CARBOts) and second, by the chemical deposition of magneto-catalytic iron nanoparticles (FeNPs) of ∼30 nm or less in size on the CS surface (iCARBOts). The chemical synthesis of magneto-catalytic iron nanoparticle (FeNPs)-based iCARBOts provides an economical alternative to the synthesis of CARBOts by a physical method. The hydrophobic soot contained agglomerates of high-density carbon nanospheres of ∼40 nm or less in size, generated from the incomplete combustion of a hydrocarbon source. The catalytic component (Pt nanofilm or FeNPs) on the nanostructures on the CS surface allowed the rapid catalytic decomposition of aqueous peroxide fuel (H₂O₂) to generate chemical propulsion. The issuance of O₂ microbubbles from the motor surface imparted the required thrust for active bubble propulsion. Integration of a magnetic component (Ni nanofilm or FeNPs) facilitated remote magnetic control for micromotor navigation. These magneto-catalytic micromotors demonstrated the efficient catalytic degradation of methylene blue (MB) dye in the presence of 10% (v/v) H₂O₂ fuel under ambient conditions. The CARBOts completely decolorized the nonbiodegradable MB dye pollutant within 40 min of treatment. The magnetic sensitivity of motors facilitated the ease of retrieval and reusability after the execution of the remediation tasks, thereby increasing the feasibility of the water detoxification process. In addition, with the help of remote magnetic guidance, micromotors were employed for the removal of freely floating and surfactant-stabilized oil droplets in seawater without any further surface modification. The intrinsic superoleophilic nature of the micromotors owing to the presence of the nanostructured soot surface facilitated an enhanced oil–motor interaction, which led to efficient on-the-fly capturing of oil droplets with remote magnetic guidance.

中文翻译：

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涂有Ni / Pt纳米膜的磁驱动碳烟纳米颗粒催化CARBOts用于水的解毒和溢油回收

由空气污染物碳烟（CS）制造的用于环境修复的多功能化学动力微电机，采用以下两种方法：首先，通过物理沉积约110 nm和约100 nm的催化铂（Pt）和磁性镍（Ni）纳米级薄膜，分别通过在CS表面（iCARBOts）上化学沉积大小约为30 nm或更小的磁催化铁纳米颗粒（FeNPs）在CS（CARBOts）上进行。基于磁催化铁纳米粒子（FeNPs）的iCARBOts的化学合成为通过物理方法合成CARBOts提供了经济的选择。疏水性烟灰包含烃源不完全燃烧产生的〜40 nm或更小尺寸的高密度碳纳米球的附聚物。₂ O ₂）产生化学推进力。从电动机表面发出的O ₂微气泡赋予了主动气泡推进所需的推力。磁性组件（Ni纳米膜或FeNPs）的集成促进了微电机导航的远程磁性控制。这些磁催化微电机证明了在10％（v / v）H ₂ O ₂存在下亚甲基蓝（MB）染料的有效催化降解。在环境条件下加油。在处理后的40分钟内，CARBOts将不可生物降解的MB染料污染物完全脱色。电机的磁灵敏度有助于在执行修复任务后易于恢复和重复使用，从而提高了水排毒过程的可行性。另外，借助于远程磁导，微型马达被用于去除海水中自由浮动和表面活性剂稳定的油滴，而无需进行任何进一步的表面修饰。由于存在纳米结构的烟灰表面，微电机的固有超亲油性质促进了油-电机相互作用的增强，从而在远程磁引导下有效地实时捕获了油滴。