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A novel cementitious microfiltration membrane: mechanisms of pore formation and properties for water permeation

机译:新型水泥微滤膜:孔形成机理和透水性能

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This study involved the fabrication of a novel low-cost microfiltration membrane using quartz and cement. The entire fabrication process was conducted at room temperature, rather than utilizing high-temperature sintering, as is generally done during the fabrication of traditional inorganic membranes. The mean pore size of the membrane ranged from 0.4 to 2.4 mu m depending on the quartz-to-cement ratio (q/c) used. Two types of pores (I and II) were formed in the membrane. The formation of type I pores was mainly attributed to the stacking of cement particles. The formation of type II pores, which were less prevalent than type I pores, was attributed to the division of bigger pores by the thin needle-like ettringite. The sizes of the type I and type II pores varied significantly, depending on the used q/c. Moreover, investigation of the membrane properties showed that as the q/c used increased, increases were obtained for both the membrane porosity (from 18.4% to 31.4%) and water flux (from 0.16 to 13.26 m(3) m(-2) h(-1) bar(-1)), whereas the bending strength decreased (from 9.75 to 3.54 MPa). Additionally, element dissolution experiments demonstrated that the membrane was suitable for use for water treatment.
机译:这项研究涉及使用石英和水泥制造新型低成本微滤膜。整个制造过程是在室温下进行的,而不是像传统无机膜的制造过程中那样,利用高温烧结进行的。膜的平均孔径在0.4至2.4微米之间,具体取决于所使用的石英与水泥的比率(q / c)。膜中形成了两种类型的孔(I和II)。 I型孔的形成主要归因于水泥颗粒的堆积。 II型孔的形成要比I型孔的流行少,这归因于细针状钙矾石对较大孔的划分。 I型和II型孔的大小差异很大,具体取决于所用的q / c。此外,对膜性能的研究表明,随着使用的q / c的增加,膜的孔隙率(从18.4%增至31.4%)和水通量(从0.16到13.26 m(3)m(-2)均增加。 h(-1)bar(-1)),而抗弯强度却有所降低(从9.75到3.54 MPa)。另外,元素溶解实验证明该膜适合用于水处理。

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