球磨辅助海藻酸钠降解工艺参数的优化及其产物的结构和性能

doi:10.11896/cldb.21010003

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Abstract In order to promote the development and efficient utilization of seaweed resources, mechanical ball milling was used to assist the degradation of sodium alginate (SA) to obtain low molecular weight SA. Taking the mass average molecular weight (M_W) of the degraded SA as the response value, the Box-Behnken design was used to build the model and analyze the effects of ball milling time, CuCl₂ concentration and solution pH on the response value. Furthermore, the structure and performance of the degraded SA were characterized by gel chromatography (GPC), infrared spectrometer (FTIR), nuclear magnetic resonance spectrometer (¹H-NMR), thermos-gravimetric analyzer (TGA) and X-ray diffracto-meter (XRD). The experimental results showed that the relationship between the response value and three independent variables were in line with the quadratic model. The mathematical regression model had good predictability and the optimal conditions within the experimental ranges for the response value were forecasted to be 94.38 min for ball milling time, 4.00 mmol/L for CuCl₂ concentration, and 1.43 for solution pH. Meanwhile, the structure and performance test results of the degraded SA showed that due to the strong oxidation of H₂O₂ and the coordination of Cu²⁺, the SA was degraded, the molecular weight reduced, the intramolecular hydrogen bond was destroyed, and the force weakened. As a result, part of the molecular skeleton structure had changed, forming a molecular lactone.

Key words： mechanical ball milling method alginate degradation response surface methodology optimization

Published: 25 March 2022 Online: 2022-03-21

CLC number:

O648.2+3

Fund:National Natural Science Foundation of China (51963009), the Natural Science Foundation of Hainan Province (219QN209), and the Innovation and Scientific Research Projects for Graduates of Hainan Province (Hys2020-309).

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	Articles by authors
	LI Zhengyue
	LI Dongze
	SUN Xiuying
	CAI Peiwen
	LIAO Yuqing
	CHEN Xiuqiong
	YAN Huiqiong
	LIN Qiang

Cite this article:

LI Zhengyue,LI Dongze,SUN Xiuying, et al. Process Optimization for Ball Milling-assisted Degradation of Sodium Alginate as Well as Its Structure and Property[J]. Materials Reports, 2022, 36(6): 21010003-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21010003 OR http://www.mater-rep.com/EN/Y2022/V36/I6/21010003

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