Institute for Nanotechnology and Water Sustainability (iNanoWS), University of South Africa (UNISA), Johannesburg, South Africa.
College of Science, Engineering and Technology, University of South Africa (UNISA), Johannesburg, South Africa.
Biofouling. 2022 May;38(5):441-454. doi: 10.1080/08927014.2022.2084613. Epub 2022 Jun 10.
This work investigates the enhancement of antifouling properties of ceramic nanofiltration membranes by surface modification atomic layer deposition (ALD) of TiO. Feed solutions containing bovine serum albumin (BSA), humic acid (HA) and sodium alginate (SA) were used as model foulants. The classic fouling mechanism models and the modified fouling indices (MFI) were deduced from the flux decline profiles. Surface roughness values of the ALD coated and uncoated membranes were 63 and 71 nm, respectively, while the contact angles were 34.2 and 59.5°, respectively. Thus, coating increased the water affinity of the membrane surfaces and consequently improved the anti-fouling properties. The MFI values and the classic fouling mechanism correlation coefficients for cake filtration for the ALD coated and the uncoated membrane upon SA fouling were 42,963 ( = 0.82) and 143,365 sL ( = 0.98), respectively, whereas the correlation coefficients for the combined foulants (SA + BSA + HA) were 267,185 ( = 0.99) and 9569 sL ( = 0.37), respectively. The study showed that ALD can effectively enhance the antifouling properties of ceramic membranes.
本工作通过原子层沉积（ALD）在陶瓷纳滤膜表面修饰 TiO2 来提高其抗污染性能。以牛血清白蛋白（BSA）、腐殖酸（HA）和海藻酸钠（SA）为模型污染物，使用含有这些污染物的进料溶液。从通量下降曲线推导了经典的污染机制模型和改进的污染指数（MFI）。ALD 涂层和未涂层膜的表面粗糙度值分别为 63nm 和 71nm，接触角分别为 34.2°和 59.5°。因此，涂层增加了膜表面的亲水性，从而提高了抗污染性能。在 SA 污染时，ALD 涂层和未涂层膜的 MFI 值和经典污染机制相关系数分别为 42963sL（ = 0.82）和 143365sL（ = 0.98），而对于组合污染物（SA+BSA+HA），相关系数分别为 267185sL（ = 0.99）和 9569sL（ = 0.37）。研究表明，ALD 可以有效提高陶瓷膜的抗污染性能。
