Department of Transportation and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, PR China.
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, PR China.
Ecotoxicol Environ Saf. 2021 Feb;209:111803. doi: 10.1016/j.ecoenv.2020.111803. Epub 2020 Dec 22.
The development of efficient and sustainable sorbents for emergent oil cleanup has attracted tremendous attention. In this study, the feasibility of enzymatic grafting of octadecylamine (ODA) on corn stalk pith (CSP) by laccase-TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) treatment for enhanced oil-water separation was investigated. The dynamic contact angle tests suggest that the modified CSP (LCSP) had higher hydrophobicity (WCA, 157.2˚) and lipophilicity (OCA, 0˚) than the CSP did. In addition, the introduction of ODA onto the surface of modified CSP was verified by a variety of characterization techniques including SEM, FT-IR, and XPS. Compared with the control, laccase-TEMPO treatment of CSP coupled with octadecylamine grafting greatly improved the oil sorption capacity from 13.24 g/g to 44.25 g/g, while substantially reduced the water sorption capacity from 15.52 g/g to 2.76 g/g. LCSP has fast kinetic (sorption equilibrium reached before 60 min) and high fits to the pseudo-second-order kinetic model. The results obtained in this study reveal the feasibility of using Laccase-TEMPO treatment to graft the ODA onto the surface of CSP, thereby enhancing the rate and capacity of oil separation from oily water. The method and sorbent developed in this study hold promise for green, simple and cost-effective oil cleanup during oil spillage emergency events.
高效、可持续的吸油材料的开发在油污清理中引起了极大关注。本研究通过漆酶-TEMPO（2,2,6,6-四甲基哌啶-1-氧自由基）处理，考察了在玉米芯髓（CSP）上酶接枝十八胺（ODA）用于增强油水分离的可行性。动态接触角测试表明，改性后的 CSP（LCSP）具有更高的疏水性（WCA，157.2°）和亲油性（OCA，0°）。此外，通过多种表征技术，包括 SEM、FT-IR 和 XPS，验证了 ODA 被引入到改性 CSP 的表面。与对照相比，漆酶-TEMPO 处理 CSP 并接枝十八胺大大提高了吸油能力，从 13.24 g/g 提高到 44.25 g/g，同时将吸水量从 15.52 g/g 降低到 2.76 g/g。LCSP 具有快速动力学（60 min 内达到吸附平衡）和高拟合度伪二级动力学模型。本研究结果表明，利用漆酶-TEMPO 处理在 CSP 表面接枝 ODA 是可行的，从而提高了从含油污水中分离油的速率和容量。本研究中开发的方法和吸附剂有望在溢油应急事件中实现绿色、简单和经济有效的油污清理。
