Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (07): 109-116.doi: 10.13475/j.fzxb.20190903908

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Application of magnetic-graphene oxide/poly(allylamine hydrochloride) microcapsules for adsorption of dyes

ZHAO Zhiqi1,2, LI Qiujin1,2, SUN Yuejing1,2, GONG Jixian1,2, LI Zheng1,2, ZHANG Jianfei1,2,3()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Key Laboratory of Advanced Textile Composites, Ministry of Education, Tiangong University, Tianjin 300387, China
    3. Collaborative Innovation Center for Eco-Textiles of Shandong Province, Qingdao, Shandong 266071, China
  • Received:2019-09-12 Revised:2020-03-23 Online:2020-07-15 Published:2020-07-23
  • Contact: ZHANG Jianfei E-mail:zhangjianfei1960@126.com

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Abstract:

Facing the problem that printing and dyeing wastewater pollutes environment, this paper reports on hybrid magnetic microcapsules with Fe3O4-graphene oxide (Fe3O4-GO) and poly(allylamine hydrochloride) (PAH) for purifying and cleaning the wastewater during dyeing processes. These microcapsules were made through layer-by-layer (LBL) self-assembly due to the opposite charges of Fe3O4-GO and PAH. The structure and morphology of Fe3O4-GO and (PAH/Fe3O4-GO)n were characterized. Cationic methylene blue was then used to study the adsorption behaviour and mechanism of magnetic microcapsules. When methylene blue dye (0.2-3.0 mg/mL) was absorbed for 20 minutes by microcapsules, the adsorption reached maximum. Moreover, the absorption reaches maximum value at pH of 12 with an adsorption rate of 96.5%. The pseudo-second-order adsorption kinetic and Langmuir adsorption isothermal model are more suitable for describing the adsorption process of methylene blue on magnetic (PAH/Fe3O4-GO)2 microcapsules, with the theoretical maximum adsorption of 219.996 mg/g.

Key words: graphene oxide, magnetic microcapsules, dyeing wastewater, methylene blue, adsorption

CLC Number: 

  • TS195.5

Fig.1

Schematic illustration of LBL assembly of (PAH/Fe3O4-GO)n"

Fig.2

Images of Fe3O4-GO. (a) Optical microscope image; (b) TEM image"

Fig.3

Optical microscope images of (PAH/Fe3O4-GO)n"

Fig.4

Separation of (PAH/Fe3O4-GO)n microcapsules from solution by magnetic field"

Fig.5

Fourier transform infrared spectrum of Fe3O4-GO and (PAH/Fe3O4-GO)n"

Fig.6

Effect of adsorbent mass on adsorption capacity"

Fig.7

Adsorption of (PAH/Fe3O4-GO)2 to MB at different initial concentration and time"

Fig.8

Effect of pH value on (PAH/Fe3O4-GO)2 absorption to MB"

Fig.9

Adsorption of (PAH/Fe3O4-GO)2 microcapsules on different concentrations of MB"

Fig.10

Pseudo-first-order(a) and pseudo-second-order (b) kinetic for adsorption of MB by (PAH/Fe3O4-GO)2 microcapsules"

Tab.1

Kinetic model parameters for adsorption of MB by (PAH/Fe3O4-GO)2"

MB质量
浓度/
(mg·mL-1)		 吸附量
测量值/
(mg·g-1)		 准一级动力学 准二级动力学
Qe/(mg·g-1) k1/min-1 R2 Qe/(mg·g-1) k2/(g·mg-1·min-1) R2
1.0 62.995 8 35.644 2 0.025 3 0.603 4 62.640 2 0.015 9 0.999 9
2.5 86.533 7 51.214 7 0.018 3 0.700 7 86.533 0 0.011 6 0.999 8

Fig.11

Langmuir and Freundlich adsorption isotherms of MB on (PAH/Fe3O4-GO)2 microcapsules"

Tab.2

Adsorption isotherm parameter for adsorption of MB by (PAH/Fe3O4-GO)2"

Langmuir模型 Freundlich模型
Qmax/
(mg·g-1)		 KL R2 1/n KF R2
219.996 0.422 12 0.958 21 0.849 29 5.126 48 0.947 94

Tab.3

Effect of elution times on desorption rate of (PAH/Fe3O4-GO)2"

洗脱次数 脱附率/%
1 52
2 53
3 54
4 54
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