CN-117449035-B - Preparation method of beaded sodium alginate nanofiber membrane

CN117449035BCN 117449035 BCN117449035 BCN 117449035BCN-117449035-B

Abstract

The invention belongs to the technical field of nano materials, and particularly discloses a preparation method of a beaded sodium alginate nanofiber membrane for air purification. Comprises (1) respectively preparing SA aqueous solution and PEO aqueous solution, mixing the SA aqueous solution and the PEO aqueous solution according to the proportion of 9:1 to obtain SA/PEO solution with the concentration of 2.4% -2.8%, and dripping ethanol and triton into the SA/PEO solution to obtain spinning solution. (2) And carrying out electrostatic spinning on the spinning solution to obtain the sodium alginate nanofiber membrane. (3) Placing the sodium alginate nanofiber membrane into absolute ethyl alcohol, standing for 1min, then placing the sodium alginate nanofiber membrane into calcium chloride crosslinking liquid with the concentration of 5.0% for soaking for 1min to crosslink calcium ions, and then freeze-drying the sodium alginate nanofiber membrane crosslinked by the calcium ions. The invention can simply and conveniently obtain the high-efficiency low-resistance beaded sodium alginate nanofiber membrane by regulating and controlling the concentration of the SA/PEO solution.

Inventors

JU JUNPING
SUN WEI
YANG JINZHU
YUAN HUA
TAN YEQIANG

Assignees

青岛大学

Dates

Publication Date: 20260512
Application Date: 20231026

Claims (1)

1. The preparation method of the beaded sodium alginate nanofiber membrane is characterized by comprising the following steps of: S1, preparing a spinning solution, namely respectively preparing an SA aqueous solution and a PEO aqueous solution, mixing the SA aqueous solution and the PEO aqueous solution according to the proportion of 9:1 to obtain an SA/PEO solution with the solute mass concentration of 2.6%, dropwise adding ethanol and triton into the SA/PEO solution, stirring for a period of time to obtain the spinning solution, and carrying out centrifugal defoaming treatment on the spinning solution for later use, wherein the ethanol and the triton account for 10 w% and 0.8: 0.8 w% respectively in the spinning solution; S2, carrying out electrostatic spinning on the spinning solution after centrifugal defoaming to obtain a sodium alginate nanofiber membrane, wherein the centrifugal defoaming condition is that the spinning solution is subjected to centrifugation at 3000r/min for 10min, and the electrostatic spinning process conditions comprise a spinning voltage of 30kV, a propelling speed of 0.01mL/min, a receiving distance of 18cm, a receiving roller rotating speed of 180-200 r/min, a spinning environment is controlled to be at 15-25 ℃ and humidity of 20-30%, and a spinning needle moving speed of 10cm/min; s3, placing the sodium alginate nanofiber membrane into absolute ethyl alcohol, standing for 1min, then placing the sodium alginate nanofiber membrane into calcium chloride crosslinking liquid with the concentration of 5.0% for soaking for 1min to crosslink calcium ions, and then freeze-drying the sodium alginate nanofiber membrane crosslinked by the calcium ions, wherein the beaded sodium alginate nanofiber membrane is used for air filtration.

Description

Preparation method of beaded sodium alginate nanofiber membrane Technical Field The invention belongs to the technical field of nano materials, and particularly relates to a preparation method of a beaded sodium alginate nanofiber membrane. Background Air filtration is considered to be one of the most effective techniques for alleviating this problem, because air contains dust particles carrying bacteria, viruses, and the like. Fiber filters have been receiving attention for their advantages in comparison to membrane filters, such as ease of mass production, cost effectiveness, variety of materials, and energy conservation. Currently, the fiber filters are manufactured by a variety of techniques, such as stretching, spin bonding, templating and melt blowing. The electrospinning fiber is considered to be a simple and universal method for preparing the efficient nanofiber membrane from top to bottom due to the fact that the diameter and the morphology are controllable, the pore structures are mutually communicated, the specific surface area and the porosity are high. The electrostatic spinning nanofiber membrane with the mutually coherent pore structure has a huge application prospect in the field of air purification. At present, an electrostatic spinning nanofiber membrane is mainly formed by random arrangement and deposition of fibers with smooth surfaces, the stacking structure is single, the fiber membrane is compact, and air and liquid permeation is not facilitated, so that the filtration resistance is large. Disclosure of Invention The invention aims to provide a preparation method of a beaded sodium alginate nanofiber membrane, which effectively solves the problem of high filtration resistance of the conventional electrostatic spinning nanofiber membrane. In order to solve the technical problems, the invention adopts the following technical scheme: The preparation method of the beaded sodium alginate nanofiber membrane comprises the following steps of S1, preparing an SA aqueous solution and a PEO aqueous solution respectively, mixing the SA aqueous solution and the PEO aqueous solution according to a ratio of 9:1 to obtain an SA/PEO solution with a solute mass concentration of 2.4% -2.8%, dropwise adding ethanol and triton into the SA/PEO solution, stirring for a period of time to obtain a spinning solution, and carrying out centrifugal defoaming treatment on the spinning solution for later use. And S2, carrying out electrostatic spinning on the spinning solution after centrifugal defoaming to obtain the sodium alginate nanofiber membrane. S3, placing the sodium alginate nanofiber membrane into absolute ethyl alcohol, standing for 1min, then placing the sodium alginate nanofiber membrane into calcium chloride crosslinking liquid with the concentration of 5.0% for soaking for 1min to crosslink calcium ions, and then freeze-drying the sodium alginate nanofiber membrane crosslinked by the calcium ions. Further, in step S1, the ratio of ethanol to triton in the spinning solution is 10w% and the ratio of triton in the spinning solution is 0.8w%, respectively. Further, in step S1, the SA/PEO solution has a solute mass concentration of 2.6%. Further, in the step S1, the condition of centrifugal defoaming is that the centrifugal defoaming is carried out for 10min at 3000 r/min. Further, in the step S2, the process conditions of the electrostatic spinning comprise a spinning voltage of 30kV, a propelling speed of 0.01mL/min, a receiving distance of 18cm, a rotating speed of a receiving roller of 180-200 r/min, a spinning environment controlled to be at 15-25 ℃ and 20-30% of humidity, and a spinning needle moving speed of 10cm/min. The invention has the beneficial technical effects that the invention can realize the regulation and control of the beaded multi-stage structure of the sodium alginate nanofiber membrane without using expensive nano additives and various materials and complicated experimental preparation steps. The invention can simply and conveniently obtain the high-efficiency low-resistance beaded sodium alginate nanofiber membrane by regulating and controlling the concentration of the SA/PEO solution. Drawings Fig. 1 is an SEM image of the sodium alginate nanofiber membranes of examples 1 to 3 and comparative example 1 of the present invention, wherein (a) is the sodium alginate nanofiber membrane of example 1, (B) is the sodium alginate nanofiber membrane of example 2, (C) is the sodium alginate nanofiber membrane of example 3, and (D) is the sodium alginate nanofiber membrane of comparative example 1; FIG. 2 is a steady-state shear diagram (A) and an extensional rheology diagram (B) of the spinning solutions of examples 1 to 3 and comparative example 1 of the present invention; FIG. 3 is a graph showing pore size distribution of the sodium alginate nanofiber membranes of examples 1-3 and comparative example 1 of the present invention. Detailed Description The present invention will be described