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Citation: CHANG Yanhong, DONG Xiaoning. Preparation of Porous Chitosan-graft-poly(acrylic acid)/Na-montmorillonite Superabsorbent Composite and Its Absorption Performance for Pb²⁺[J]. Chinese Journal of Applied Chemistry, ;2015, 32(6): 623-628. doi: 10.11944/j.issn.1000-0518.2015.06.140337 shu

Preparation of Porous Chitosan-graft-poly(acrylic acid)/Na-montmorillonite Superabsorbent Composite and Its Absorption Performance for Pb²⁺

CHANG Yanhong ^, ,
DONG Xiaoning

1.
School of Chemical Engineer and Technology, Tianshui Normal University, Tianshui, Gansu 741001, China

Corresponding author: CHANG Yanhong,
Received Date: 4 October 2014
Available Online: 13 January 2015
Fund Project: 天水师范学院中青年科研项目(TSB1106)资助 (TSB1106)

Using the self-assembled anionic surfactant sodium n-dodecyl sulfonate(SDS) micelles as porous templates, a novel porous chitosan-graft-poly(acrylic acid)/Na-montmorillonit(CS-g-PAA/Na-MMT)superabsorbent composite was successfully prepared by grafting copolymerization of chitosan(CS),acrylic acid(AA) and Na-montmorillonite(Na-MMT),using ammonium persulfate(APS) as the initiator and N,N'-methylenebisacrylamide(MBA) as the crosslinker. The mechanism for this reaction was proposed. Scanning electron microscope(SEM) analysis demonstrated that the morphologies of the SDS-added sample displays homogeneous and well-defined porous structures. Effect of SDS concentration on the equilibrium swelling ratio and swelling rate of the hydrogels were evaluated. The results show that the equilibrium swelling ratio of the1.5 mmol/L SDS sample in distilled water and 0.9% mass fraction of Na Cl solution are improved to 53.9%and 35.3%,respectively. Compared to the sample without SDS,the initial swelling rate constant,K_is,is also improved from 1.2652 g/(g·s) to 5.1680 g/(g·s). In addition,the porous structure can accelerate the adsorption rate for Pb²⁺,which reaches the 95% saturation adsorption capacity during the initial 10 min,and achieves adsorption equilibrium within 30 min.
- chitosan,
- Na-montmorillonite,
- porous superabsorbent composite,
- swelling properties,
- Pb²⁺ absorption
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Preparation of Porous Chitosan-graft-poly(acrylic acid)/Na-montmorillonite Superabsorbent Composite and Its Absorption Performance for Pb2+

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通讯作者: 陈斌, bchen63@163.com

Preparation of Porous Chitosan-graft-poly(acrylic acid)/Na-montmorillonite Superabsorbent Composite and Its Absorption Performance for Pb²⁺