Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (03): 137-147.doi: 10.13475/j.fzxb.20220907601

• Dyeing and Finishing Engineering • Previous Articles     Next Articles

Preparation and photocatalytic properties of N-TiO2/ polypropylene melt-blown nonwovens

CHEN Rongxuan1,2, SUN Hui1,2(), YU Bin1,2   

  1. 1. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, Zhejiang 312000, China
  • Received:2022-12-29 Revised:2023-12-14 Online:2024-03-15 Published:2024-04-15
  • Contact: SUN Hui E-mail:wlzxjywl@126.com

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Abstract:

Objective Titanium dioxide (TiO2) has non-toxicity, low cost, and high photocatalytic activity. However, the photocatalytic ability of TiO2 itself cannot reach the application level, and the powdered TiO2 is difficult to recycle and reuse.Thus, it is difficult for TiO2 to be practically applied in industrial fields. Polypropylene (PP) melt-blown nonwoven material with good chemical stability, low price, and simple manufacturing process has been widely used in air filtration, medical protection, and other fields. However, its single function limits its application. This research aims to improve photocatalytic ability and to tackle the recycling of TiO2 by doping N with TiO2 and then loading N-TiO2 nanoparticles on the surface of PP melt-blown nonwovens.

Method N-TiO2 photocatalyst was first prepared by sol-gel method, and the optimal doping amount of N was determined by studying the surface morphology, microstructure, chemical structure, and photocatalytic performance of N-TiO2. The N-TiO2 photocatalyst with the best performance was loaded on the surface of PP melt-blown nonwovens by ultrasonic impregnation method. The surface morphology, chemical composition and structure, and photocatalytic properties of N-TiO2/PP composite melt-blown nonwovens with different N-TiO2 loading concentrations were studied. The photocatalytic mechanism of N-TiO2/PP composite melt-blown materials for organic dyestuff was verified and analyzed by free radical capture experiments.

Results The particle size of N-TiO2 reached about 10 nm. N-TiO2 with N doping amount of 1% was found to have the best photocatalytic performance for MB. After loading the optimal N-TiO2 on the surface of PP melt-blown nonwovens, N-TiO2 were found uniformly wrapped on the surface of PP fibers. The agglomeration of N-TiO2 on the surface of PP fibers occurs when the loading amount of N-TiO2 exceeds 30 mg. Compared with PP melt-blown materials, the water contact angle of N-TiO2/PP composite melt-blown materials was significantly reduced, and the thermal stability was also improved. When the N-TiO2 loading amount is 30 mg, the photocatalytic degradation rate of N-TiO2/PP composite melt-blown material for MB reached 98% under the conditions of 30 min dark adsorption and 90 min photocatalysis. After trapping superoxide radicals (· O 2 -) and hydroxyl radicals (·OH), the photocatalytic MB degradation efficiency of N-TiO2 with 1% N doping were decreased by 22% and 23%, respectively. After being first used for the MB photocatalytic degradation, the crystalline structure and morphology of N-TiO2/PP composite melt-blown nonwovens remained the same. After the fourth MB photocatalytic degradation, the photocatalytic degradation efficiency of the composite melt-blown material for MB was about 58%.

Conclusion Low N doping amount can effectively improve the photocatalytic performance of TiO2. N-TiO2/PP composite melt-blown material has proved to effectively degrade methylene blue dye. The composite melt-blown material has good stability and is recyclable. The research provides reference for expanding the application of PP melt-blown materials in the water treatment industry.

Key words: nitrogen doped titanium dioxide, polypropylene melt-blown nonwoven, photocatalytic, methylene blue, radical, dyeing and printing wastewater, wastewater treatment

CLC Number: 

  • TS176

Tab.1

Sample ratio"

样品
编号		 样品名称 尿素质量
分数/%		 TiO2质量
分数/%		 N-TiO2负载
量/mg
1# TiO2 0 100 —
2# 1 99 —
3# N-TiO2 5 95 —
4# 10 90 —
5# 20 80 —
6# PP熔喷材料 0 0 —
7# 1 99 10
8# N-TiO2/PP 1 99 20
9# 复合熔喷 1 99 30
10# 材料 1 99 40
11# 1 99 50

Fig.1

SEM images of TiO2 and N-TiO2 materials with different N doping ratios"

Fig.2

TEM images of N-TiO2 material with 20% N doping ratio. (a) Low resolution image; (b) High resolution image"

Fig.3

FT-IR spectra of TiO2 and N-TiO2 materials with different N doping ratios"

Fig.4

Degradation curves of TiO2 and N-TiO2 materials with different doping ratios to methylene blue (a) and their first-order reaction rates (b)"

Fig.5

SEM images of PP and N-TiO2/PP composite melt-blown materials with different loadings"

Tab.2

Element contents of PP and N-TiO2/PP material material with loading amount of 30 mg"

样品
编号		 元素 质量
百分比/%		 原子
百分比/%
6# C 100.00 100.00
9# C 32.72 53.94
N 18.24 25.79
Ti 49.04 20.27

Fig.6

Elemental distribution of PP and N-TiO2/PP composite melt-blown material with loading amount of 30 mg"

Fig.7

XRD patterns of PP, Ti O 2 , N-TiO2 and N-TiO2/PP composite melt-blown materials with different loadings amount"

Fig.8

FT-IR spectra of PP, N-TiO2 and N-TiO2/PP composite melt-blown materials with different loading amount"

Fig.9

UV-Vis diffuse reflectance spectra of PP, N-TiO2/PP composite melt-blown materials with different loading amount"

Fig.10

TG (a) and DTG (b) curves of PP and N-TiO2/PP composite melt-blown materials with different loading amount"

Fig.11

Water contact angles of PP and N-TiO2/PP composite melt-blown materials with different loading amount"

Fig.12

Degradation curves of methylene blue(a) and first-order reaction rate curves (b) of N-TiO2/PP composite melt-blown material with different loading amount"

Fig.13

Photocatalytic degradation efficiency of methylene blue for N-TiO2 materials after different radical trapping (a) and photocatalytic mechanism of N-TiO2/PP composite melt-blown material(b)"

Fig.14

XRD pattern(a)and SEM image(b)of N-TiO2/PP composite melt-blown nonwoven material after being first used for MB photocatalytic degradation, and repeated photocatalytic degradation efficiency of MB (c)"

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