State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
Chemosphere. 2022 Jan;287(Pt 3):132260. doi: 10.1016/j.chemosphere.2021.132260. Epub 2021 Sep 14.
Cementitious membrane (CM) is a promising microfiltration membrane with low cost for raw materials and low energy consumption of non-sintering fabrication process. A novel carbon-cementitious microfiltration membrane (CCM) was fabricated with powdered activated carbon (PAC) as an additive based on CM, to solve the low mechanical strength of CM during multiple practical uses. While maintaining adequate pure water flux and porosity, the mechanical strength of the membrane was greatly improved to ensure the stability of the membrane in the filtration process. The bending strength of the CCM was 2-3 times higher than that of CM. 10 wt% CCM has the smallest critical pore size and optimal permeability, which was chosen to be the optimal PAC doping ratio. The X-ray diffraction and FT-IR results indicated that the addition of PAC did not change the mineral composition of cement hydration products, and the appropriate amount of PAC acted as a nucleation site and accelerated hydration. The effect of size effect on bending strength was more obvious with the decrease of membrane thickness. In the membrane adsorption experiments of benzophenone-4, nitrobenzene and p-chloronitrobenzene, the CCM exhibited prominent adsorption properties than CM. These results broaden the application scope of microfiltration membranes in water treatment process.
水硬性膜（CM）是一种很有前途的微滤膜，其原材料成本低，非烧结制造工艺能耗低。本研究以 CM 为基础，采用粉末活性炭（PAC）作为添加剂，制备了一种新型的碳水硬性微滤膜（CCM），以解决 CM 在多次实际应用中机械强度低的问题。在保持足够纯水通量和孔隙率的同时，大大提高了膜的机械强度，确保了膜在过滤过程中的稳定性。CCM 的弯曲强度比 CM 高 2-3 倍。10wt%的 CCM 具有最小的临界孔径和最佳的渗透性，被选为最佳的 PAC 掺杂比。X 射线衍射和 FT-IR 结果表明，PAC 的加入并没有改变水泥水化产物的矿物组成，适量的 PAC 作为成核点加速了水化反应。随着膜厚度的减小，尺寸效应对弯曲强度的影响更加明显。在二苯甲酮-4、硝基苯和对氯硝基苯的膜吸附实验中，CCM 表现出比 CM 更优异的吸附性能。这些结果拓宽了微滤膜在水处理过程中的应用范围。
