Page 126 - 《精细化工》2020年第1期

第 37 卷第 1 期 精 细 化 工 Vol.37, No.1
202 0 年 1 月 FINE CHEMICALS Jan. 2020

有机电化学与工业
基于单电流阶跃法的淀粉间接电化学氧化研究

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曹胜魁 1,2 ，顾 敏 ，陈 慧 1,2 ，单志华 1,2*
（1. 四川大学 轻工科学与工程学院生物质与皮革工程系，四川 成都 610065；2. 四川大学 皮革化学与
工程教育部重点实验室，四川 成都 610065）

摘要：以钛板作为阴极，石墨烯为阳极，NaCl 为支持电解质兼氧化源，进行淀粉的间接电氧化。以电流密度、
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可溶性淀粉（SS）质量分数、NaCl 质量分数、电解时间 4 个因素进行 L 9 (3 )正交实验。正交实验结果表明,最佳
的 SS 和 NaCl 质量分数分别为 10%、2%。采用单电流阶跃法对电流密度、电解时间进行了单因素考察，结果表
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明，最佳的电流密度是 20 mA/cm 。根据图像中电势的跃迁特征取样进行淀粉氧化过程醛基分析，获得间接氧
化实验体系最佳时间为电势的转折点。分析发现，转折点上的氧化淀粉含醛基质量分数已接近最大平衡。FTIR
及 XRD 的辅助分析证明，在转折点的氧化淀粉结构与原淀粉之间已发生了明显氧化变化，确定最佳电解时间是
1200 s。在此条件下，得到氧化淀粉含醛基质量分数为 0.432%。
关键词：氧化淀粉；电氧化；单电流阶跃法；醛基；有机电化学与工业
中图分类号：TQO35 文献标识码：A 文章编号：1003-5214 (2020) 01-0112-05

Research of indirect electrochemical oxidation of
starch on single current step method

1,2
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1,2
Cao Shengkui , Gu Min , Chen Hui , Shan Zhihua 1,2*
（1. Department of Biomass Chemistry and Leather Engineering, College of Biomass Science and Engineering, Sichuan
University, Chengdu 610065, Sichuan, China; 2. The Key Laboratory of Leather Chemistry and Engineering of
Ministry of Education, Sichuan University, Chengdu 610065, Sichuan, China）

Abstract: A titanium plate was used as a cathode, graphene was used as an anode, and NaCl was used as
supporting electrolyte and oxidation source for the indirect electrooxidation of the starch. Orthogonal
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experiment L 9(3 ) was carried out with four factors: current density, mass fraction of soluble starch (SS),
mass fraction of NaCl and electrolysis time. The results showed that the optimal SS and NaCl mass
fractions were 10% and 2%, respectively. The single-current step method was used to investigate the current
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density and electrolysis time. The optimal current density was 20 mA/cm . According to the transition
characteristics of the potential in the image, the aldehyde group analysis of the starch oxidation process was
carried out, and the optimal time of the dynamic equilibrium of the indirect oxidation experimental system
was obtained as the turning point of the potential. It was found that the mass fraction of aldehyde-
containing starch at the turning point was close to the maximum equilibrium. FTIR and XRD results
demonstrated that significant changes had occurred between the structure of the oxidized starch at the
turning point and the original starch. The optimum electrolysis time was determined to be 1200 s. Under
these conditions, the oxidized starch with a mass fraction of aldehyde group of 0.432% was obtained.
Key words: oxidized starch; electro oxidation; single current step method; aldehyde; electro-organic
chemisitry and industry

淀粉（Starch）可以通过物理、化学变性和生物 降解制得性质各异、适用于不同应用领域的变性淀

收稿日期：2019-05-14; 定用日期：2019-07-16; DOI: 10.13550/j.jxhg.20190431
基金项目：国家自然科学基金（51703100）
作者简介：曹胜魁（1994—），男，硕士生，E-mail：caoshengkui_1994@163.com。联系人：单志华（1957—），男，教授，E-mail：
163282243@qq.com。