Alkoxysilanes play an important role in the development of new superhydrophobic sorbent materials with high sorption capacity for the cleanup of oil spills from water. Here, three different alkoxysilanes with 1, 8 and 16 carbon (C) chains were used for the first time to elucidate the role of alkoxysilanes and to determine the relation between the functional alkyl chain length of alkoxysilane compound within the coating formulation and the surface, sorption and separation properties of novel superhydrophobic sorbent materials fabricated in scCO atmosphere. Both the modification of activated halloysite nanotube (HNT) with each methyltrietoxysilane (METES), octyltriethoxysilane (OTES) and hexadecyltrimethoxysilane (HDTMS) separately and the direct fabrication of melamine sponge (MS)-HNT/alkoxysilane hybrid composite sorbents (MS-METES, MS-OTES and MS-HDTMS) were achieved by innovative drainage technique in scCO atmosphere. The surface properties of superhydrophobic sorbents were examined using contact angle, SEM, EDS, FTIR, XPS and Si-MAS NMR techniques. Maximum sorption capacity of melamine sponge-based hybrid materials decreased from 122.2 g/g to 90.4 g/g as the chain length of alkoxysilane was increased from C to C. Water contact angle, density and porosity of superhydrophobic MS-METES, MS-OTES and MS-HDTMS sorbents were determined to be 153.0°, 13.56 mg/cm and 99.10 %; 159.4°, 16.58 mg/cm and 98.90 %; and 165.4°, 18.90 mg/cm and 98.75 %, respectively. All sorbents exhibited excellent thermal stability, good chemical stability, good robustness, and high mechanical durability. Experimental results revealed that the novel coating technique applied to porous MS have a significant potential for the direct fabrication of new superhydrophobic and superoleophilic sponge-based sorbent materials.

中文翻译：

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烷氧基硅烷链长对在 scCO2 气氛中采用创新排水技术生产的新型超疏水多孔吸附剂材料的表面、稳定性、吸附和油水分离性能的影响


烷氧基硅烷在开发具有高吸附能力的新型超疏水吸附剂材料中发挥着重要作用，可用于清除水中的溢油。在此，首次使用具有 1、8 和 16 个碳 (C) 链的三种不同的烷氧基硅烷来阐明烷氧基硅烷的作用，并确定涂料配方中烷氧基硅烷化合物的官能烷基链长度与表面之间的关系， scCO气氛中制备的新型超疏水吸附剂材料的吸附和分离性能。分别用甲基三乙氧基硅烷（METES）、辛基三乙氧基硅烷（OTES）和十六烷基三甲氧基硅烷（HDTMS）对活化埃洛石纳米管（HNT）进行改性，以及直接制备三聚氰胺海绵（MS）-HNT/烷氧基硅烷杂化复合吸附剂（MS-METES，MS） -OTES 和 MS-HDTMS）是通过 scCO 气氛中的创新排水技术实现的。使用接触角、SEM、EDS、FTIR、XPS 和 Si-MAS NMR 技术检查超疏水吸附剂的表面性质。随着烷氧基硅烷的链长从C增加到C，三聚氰胺海绵基杂化材料的最大吸附容量从122.2 g/g下降到90.4 g/g。超疏水MS-METES、MS-OTES的水接触角、密度和孔隙率MS-HDTMS 吸附剂测定为 153.0°、13.56 mg/cm 和 99.10%； 159.4°、16.58 毫克/厘米和 98.90%；分别为 165.4°、18.90 mg/cm 和 98.75%。所有吸附剂均表现出优异的热稳定性、良好的化学稳定性、良好的坚固性和高机械耐久性。 实验结果表明，应用于多孔MS的新型涂层技术对于直接制造新型超疏水和超亲油海绵基吸附剂材料具有巨大的潜力。