Fabrication and Evaluation of Chitosan-based Composite Antibacterial Air Filter

doi:10.12068/j.issn.1005-3026.2024.02.015

Abstract

Abstract:

With the outbreak of COVID-19， there is a growing demand for improved indoor air quality. It is of great significance to explore filter materials that can not only filter fine particulate matter， but also inhibit and disinfect microbial bacteria and prevent secondary pollution. Chitosan impregnation solutions with different concentrations were prepared with 1% mass fraction of polytetrafluoroethylene （PTFE） emulsion， and chitosan/polyester/polytetrafluoroethylene composite antibacterial air filter was designed and fabricated by direct impregnation post-processing. Escherichia coli was used as the experimental colony to verify its bacteriostatic properties， and its fabric characteristics， collection efficiency and pressure drop characteristics were studied. The results showed that the initial pressure drop of the composite air filter was the lowest when the chitosan concentration was 12.5 mg/mL， the collection efficiency for PM_2.5 was 93.88%， the quality factor was 0.020 13， which was 19.56% and 0.004 4 higher than that of the raw air filter， and the bacteriostatic rate of E. coli was 84.12%. In conclusion， chitosan/polyester/polytetrafluoroethylene composite antibacterial air filter prepared with chitosan concentration of 12.5 mg/mL and PTFE emulsion concentration of 1% impregnation solution has both good filtration capacity and antibacterial effect.

Key words: chitosan, composite antibacterial air filter medias, antibacterial, collection efficiency, filtration properties

CLC Number:

TB 33

Jing-xian LIU, Qi ZHAO. Fabrication and Evaluation of Chitosan-based Composite Antibacterial Air Filter[J]. Journal of Northeastern University(Natural Science), 2024, 45(2): 270-275.

Figures/Tables 13

Table 1 Parameter characteristics of oligomeric chitosan

CAS编码

分子式

相对分子

质量

脱乙酰度

干燥

失重率

C_6nH_11nNO_4n

Table 2 PTFE emulsion parameter characteristics

类别	密度/（g·cm^-3）	运动黏度/（mm²·s^-1）	PTFE质量分数/%	乳液质量分数/%
SFN-1	1.48～1.53	6～14	53～63	4～8

Table 3 Parameter characteristics of air filter media

规格	厚度/mm	透气度@200 Pa/（m³·m^-2·min^-1）	密度/（g·cm^-3）
F7	4.60	91.73	1.97/64=0.030 8

Table 4 The characteristics of the filter fabric change before and after emulsion impregnation

w（PTFE）/%	浸渍前质量	浸渍后质量	差值	壳聚糖质量	吸附率	浸渍前透气度	浸渍后透气度	变化率
w（PTFE）/%	g	g	g	g	%	m³·m^-2·min^-1	m³·m^-2·min^-1	%
0.5	1.76	2.36	0.60	0.49	79.20	98.8	83.6	-15.38
1	1.95	2.68	0.73	0.53	84.04	90.9	74.7	-17.82
3	1.98	3.16	1.18	0.53	84.88	92.2	69.3	-24.83
5	2.01	3.34	1.33	0.43	69.56	89.6	65.9	-26.44
7	1.90	3.55	1.65	0.42	67.43	92.9	60.2	-35.15
10	2.15	4.64	2.49	0.40	64.00	93.9	48.5	-42.19
0（纯壳聚糖）	2.00	2.51	0.51	0.51	81.60	95.8	86.5	-9.71

Fig. 2 Composite filter resistance characteristics for different PTFE emulsion concentrations

Fig. 3 Microscopic morphology of composite filter media after impregnation with different PTFE emulsion concentrations

Fig. 4 Composite filter material resistance characteristics at different wind speeds

Fig. 5 Capture efficiency of composite filter media at different wind speeds

Fig. 6 Apparent morphology of the composite filter media after impregnation with different chitosan concentrations (a)—12.5 mg/mL； (b)—25 mg/mL； (c)—50 mg/mL.

Fig. 7 Composite filter media quality factors

Fig. 8 Antibacterial circle results of E. coli

Fig. 9 Solid medium colonies

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