Riyal Isha, Joshi Gunjan, Sharma Himani, Dwivedi Charu
Department of Chemistry, Doon University, Dehradun-248001, India.
Department of Physics, Doon University, Dehradun-248001, India.
Environ Res. 2023 Nov 15;237(Pt 2):116982. doi: 10.1016/j.envres.2023.116982. Epub 2023 Aug 30.
A hydrophobic composite sponge (HPCS) is developed for the first time using the dip coating and drying method in an effort to remove organic contaminants like toluene and various oils from water. We employed a polyurethane (PU) sponge, which is reasonably priced, easily accessible, high mechanical strength and a suitable porous substrate on which the hydrophobic composite of MIL-53(Al) along with PDMS was anchored. A crystalline metal organic framework (MOF), MIL-53(Al), with adjustable porosity, functionality, and hydrophobicity is used for oil absorption. Polydimethylsiloxane (PDMS) is utilized to increase the hydrophobicity of MIL-53(Al). The MIL-53(Al)@PDMS composite was used to the produce a sponge having high hydrophobicity and oleophilicity. In contrast to PU sponge, which has a low water contact angle (79.64°), the hydrophobic composite sponge showed a wide range of oil absorption capacity (12-50.5 g/g), a very low amount of water absorption (0.84 g/g), and water contact angle of 128.13°. This hydrophobic composite performed phenomenally by separating out various oils and solvents from water even in varying ionic strengths. Moreover, the recyclability of the formed composite was also performed resulting into 6-20 cycles for different oils and solvents. The synthesized hydrophobic composite sponge was characterized using FT-IR, XRD, TEM, surface area analysis, FESEM, XPS, TG analysis and contact angle measurement. Furthermore, the materials used in the synthesis of composite are non-toxic and do not harm the environment, resulting in no greenhouse gas emissions making our composite environmentally friendly.
首次采用浸涂和干燥方法开发了一种疏水性复合海绵（HPCS），旨在从水中去除甲苯和各种油类等有机污染物。我们使用了聚氨酯（PU）海绵，其价格合理、易于获取、具有较高的机械强度，是一种合适的多孔基材，可在其上锚定MIL-53（Al）与聚二甲基硅氧烷（PDMS）的疏水复合材料。一种具有可调节孔隙率、功能性和疏水性的晶体金属有机框架（MOF），即MIL-53（Al），用于吸油。聚二甲基硅氧烷（PDMS）用于提高MIL-53（Al）的疏水性。MIL-53（Al）@PDMS复合材料被用于制备具有高疏水性和亲油性的海绵。与水接触角较低（79.64°）的PU海绵相比，疏水性复合海绵表现出广泛的吸油能力（12 - 50.5 g/g）、极低的吸水量（0.84 g/g）以及128.13°的水接触角。这种疏水性复合材料在不同离子强度下从水中分离出各种油类和溶剂的表现非常出色。此外，还对形成的复合材料的可回收性进行了测试，不同油类和溶剂的回收次数为6 - 20次。使用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、透射电子显微镜（TEM）、表面积分析、场发射扫描电子显微镜（FESEM）、X射线光电子能谱（XPS）、热重分析（TG）和接触角测量对合成的疏水性复合海绵进行了表征。此外，合成复合材料所用的材料无毒且不危害环境，不会产生温室气体排放，使得我们的复合材料对环境友好。
