Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong 3220, Victoria, Australia; Nano Surface Texturing Lab, Department of Metallurgical & Materials Engineering, Defence Institute of Advanced Technology (DU), Ministry of Defence, Girinagar, Pune 411025, India.
Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong 3220, Victoria, Australia.
J Hazard Mater. 2022 Mar 15;426:127822. doi: 10.1016/j.jhazmat.2021.127822. Epub 2021 Nov 18.
Superwettable and chemically stable waste silk fabric and degummed silk were used in this study for treatment of oily wastewater and oil/solvent recovery. Silk functionalized with a nano-fluoro dispersion showed a superhydrophobic and oleophilic nature. The functionalized silk demonstrated superoleophilicity towards petroleum oils and organic solvents, and exhibited filtration efficiencies of more than 95%, and up to 70% till 25 re-usable cycles. Furthermore, the functionalized silk materials demonstrated high permeation flux of 584 L.m.h (for Diesel) for continuous oil-water separation operation. The pH based study in highly acidic and alkaline mediums (pH from 1 to 13) showed excellent stability of nano-fluoro coated silk. Thermogravimetric analysis showed thermal stability up to 250 °C, and 400 °C, for functionalized waste silk, and degummed silk, respectively. FE-SEM analysis revealed randomly oriented spindle shaped nano particles anchored on the silk surface exhibiting hierarchical patterns, as required for the superhydrophobic Cassie-Baxter state. The rate absorption study showed close curve fitting for pseudo second order kinetics (R = 0.999), which indicated physical absorption process. BET analysis confirmed the porous nature, while the elemental XPS and EDX analysis confirmed strong bonding and uniform coating of fluoro nanoparticles on silk surface. The results demonstrated that nano-fluoro dispersion functionalized silk can be successfully employed for effective oil/solvent-water filtration, oil/solvent-spill cleanups, and treatment of oily wastewater for protection of water resources.
本研究采用超亲水、化学稳定性好的废弃丝绸和脱胶丝绸来处理含油废水和回收油/溶剂。经过纳米氟分散体功能化的丝绸表现出超疏水和亲油性。功能化丝绸对石油油和有机溶剂表现出超亲油性，过滤效率超过 95%，可重复使用 25 次，效率仍高达 70%。此外，功能化丝绸材料在连续油水分离操作中表现出高达 584 L.m.h（柴油）的高通量。在强酸性和碱性介质（pH 值从 1 到 13）中的 pH 值研究表明，纳米氟涂层丝绸具有优异的稳定性。热重分析表明，功能化废丝和脱胶丝的热稳定性分别高达 250°C 和 400°C。FE-SEM 分析表明，随机取向的纺锤形纳米颗粒固定在丝绸表面上，呈现出所需的超疏水 Cassie-Baxter 状态的分层图案。速率吸收研究表明，准二级动力学（R = 0.999）的拟合曲线非常接近，这表明是物理吸收过程。BET 分析证实了多孔性，而元素 XPS 和 EDX 分析证实了氟纳米颗粒在丝绸表面的强键合和均匀涂层。结果表明，纳米氟分散体功能化丝绸可成功用于有效过滤油/溶剂-水、油/溶剂泄漏清理以及处理含油废水以保护水资源。
