Facile Fabrication, Structure, and Applications of Polyvinyl Chloride Mesoporous Membranes

Abstract

Mesoporous polymer membranes are important in various separation processes and have become more crucial with increasing concerns in environment protection. Here, we report novel mesoporous membranes of polyvinyl chloride (PVC) nanofibers prepared via a modified freeze-extraction technique. The as-prepared nanofibers have an average diameter of ∼45 nm and are dispersed heterogeneously in an ethanol solution. The nanofiber formation is studied in detail. The resulting nanofiber dispersion is directly filtered on a macroporous support to fabricate mesoporous membranes. The as-fabricated membranes have a controllable thickness ranging from 360 nm to 1055 nm, and a high porosity up to 63% that is at least 5 times greater than that of most of the commercial ultrafiltration membranes. These membranes present an ultrahigh water flux up to 6612 L m −2 h −1 bar −1 and a good ferritin rejection during ultrafiltration. Moreover, these membranes show a fast and high-efficient absorption for Methylene Blue (MB). The newly developed mesoporous membranes have a great potential application in various separation processes.

Facile preparation and separation performances of cellulose nanofibrous membranes

“…This decrease in the crystallinity band (1431 cm –1 ) and increase in the amorphous band (897 cm –1 ) indicates the reduction in the degree of crystallinity and the increasing intensity of the amorphous content in the samples, respectively. Moreover the increase in the absorbance at about 897 cm –1 is a confirmation of the transformation of the cellulose type (I) to cellulose type (II) lattice structure at high alkaline concentration . The absorbance peak at 1431 cm –1 is the highest and the lowest for the 5 wt % and 17.5 wt % NaOH treated fibers respectively.…”

“…The rejection efficiency ( R , %) was calculated by where C i and C 0 are the concentrations in the permeate and the feed, respectively. The dye adsorbed (decolorized) and the adsorption capacity were calculated in a similar way following the previous method …”

A Versatile Approach Towards the Fast Fabrication of Highly-Permeable Polymer Mesoporous Membranes

“…However, this method is only suitable to some kinds of polymer. Other methods also have been developed to prepare polymer membranes but only are used for few kinds of polymer, such as template removal and nanofiber construction . Therefore, there is a continuous demand for a practical approach to fabricate highly‐efficient mesoporous membranes of common polymers.…”

Kesterite Cu2ZnSnS4 compounds via electrospinning: A facile route to mesoporous fibers and dense films

“…[12] However, these efficiencies in CZTSSe or CZTS based solar cells are still far away from the efficiencies which can be comparable to CIGS. [13] Low dimensional materials including fibers [14] and porous films [15][16][17] are gaining increasing interests in various applications due to its high specific surface area as well high load capacity. Besides, low dimensional electronic materials such as crystal conducting fibers have also the unique advantage of high electron mobility [18,19] along the fibers' axis due to the preferential crystallization, which would lead to fantastic properties of composing electronic devices.…”