超浸润性γ-氨丙基三乙氧基硅烷-TiO_(2)包覆织物的制备及其水净化性能

Preparation of superwetting γ-aminopropyltriethoxysilane-TiO_(2) coated fabric and its water purification performances

异向浸润性材料因其对油和水具有明显相反吸收特性成为油水分离研究的热点。本文通过将γ-氨丙基三乙氧基硅烷(APTES)与亲水纳米TiO_(2)混合并作用于织物上,经过水解、交联制备了APTES-TiO_(2)包覆的超亲水水下超疏油织物(APTES-TiO_(2)@fabric)。采用接触角测量仪、FTIR、XPS、FESEM、XRD和EDS对改性织物进行表征。结果表明,APTES-TiO_(2)成功包覆于织物表面,该织物在空气中具有0°的水接触角及在水中对所选用的油具有大于152°的油接触角。在油水分离测试中,对几种轻油的分离效率均在99%以上,且经过5次分离循环和酸碱盐溶液浸泡后依旧具有较好的分离效率。另外,织物还具有优异的光催化性能,在12 h的紫外照射下,能降解水中和吸附于自身的亚甲基蓝,达到净化水和自清洁的效果。结果表明,APTESTiO_(2)@fabric有良好的油水分离和光催化性能,对实际应用中水净化有借鉴意义。

Anisotropic wettable materials have become a hot spot in oil-water separation research because of their apparently opposite absorption characteristics for oil and water. In this paper, γ-aminopropyltriethoxysilane(APTES) and hydrophilic nano TiO_(2)were mixed and applied to the fabric. APTES-TiO_(2)coated superhydrophilic underwater superoleophobic fabric(APTES-TiO_(2)@fabric) was obtained after hydrolyzing and crosslinking. The modified fabric was characterized by contact angle measuring instrument, FTIR, XPS, FESEM, XRD and EDS. The results show that APTES-TiO_(2)is successfully coated on the surface of the fabric, which has a water contact angle of0° in air and an oil contact angle of greater than 152° for the selected oil in water. In the oil-water separation test, the separation efficiency of APTES-TiO_(2)@fabric for the several light oils is above 99%, and it still has a good separation efficiency after 5 separation cycles and soaked in acid-base salt solution. In addition, the fabric also has excellent photocatalytic performance. Under 12 h of ultraviolet irradiation, it can degrade the methylene blue in water and adsorb to itself, achieving the effect of water purification and self-cleaning. The results show that APTES-TiO_(2)@fabric has good oil-water separation and photocatalytic performance, which can be used as a reference for water purification in practical applications.