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为了解决淀粉氧化过程中产生无机废料和有毒气体而造成的环境污染问题,以过氧化氢为氧化剂,咪唑磷钼钒酸盐为催化剂,在温和条件下对玉米淀粉进行氧化研究。咪唑磷钼钒酸盐以磷钼钒多阴离子[PMo_10V_2O_40]5-与1-十八烷基-3-甲基咪唑阳离子为原料通过离子交换反应被制备。淀粉氧化实验均在25 mL烧瓶中,油浴条件下进行,实验中分别考察淀粉与水的固液比、氧化剂和催化剂用量、反应温度和时间对淀粉氧化程度的影响。氧化程度以产物中羧基含量确定,结果显示最优的氧化条件是:2.5 g淀粉,6 mL水,2.5 mL过氧化氢(30%),4 mg催化剂,60℃,反应8 h。羧基含量为:0.217 5 mol CO_2H/100 g产品。咪唑磷钼钒酸盐不仅可以使过氧化氢的分解反应速率从每小时0.095 mol/L增加到0.154 mol/L,而且实验结束后易于回收,可重复使用。基于以上研究认为,以咪唑磷钼钒酸盐为催化剂,过氧化氢为氧化剂在淀粉氧化方面具有潜在应用价值。
Abstract：The study aimed to solve the problem of environmental pollution causing by inorganic waste and toxic gases in the process of starch oxidation. The oxidation of corn starch with hydrogen peroxide as oxidant was explored using polyoxometalates catalyst under mild conditions. Imidazole molybdovanadophosphoric salt was prepared by straightforward ion exchange reaction of 1-octadecyl-3-methyl imidazolium cation and molybdovanadophosphoric heteropolyoxoanions [PMo_10V_2O_40]5-. The starch oxidation experiment was carried in 25 mL flask and in oil bath conditions. The effects of solid to liquid ratio in water and starch, the amount of hydrogen peroxide and catalyst,temperature and time of reaction were studied. The degree of oxidation was determined by carboxyl content. The results showed that the optimal reaction conditions were: 2.5 g of corn starch, 6 ml of distilled water, 2.5 mL of hydrogen peroxide(30%), 4 mg of the catalyst, the reaction temperature of 60℃, and the reaction time of 8 h. Under the above conditions, the highest amount of carboxyl content could reach 0.217 5 mol CO_2H/100 g production.Imidazole molybdovanadophosphoric salt could not only increase the decomposition rate of hydrogen peroxide from 0.095 mol/L per hour to about 0.154 mol/L, but also is easy to recycle and reuse after the end of the experiment. Our study suggested that it had potential application value for application of hydrogen peroxide as oxidant in the oxidation of starch.
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基本信息:
DOI：10.13417/j.gab.037.000909
中图分类号:O636.12;O643.36
引用信息:
[1]蒋云霞,温俊成,姜迪,等.咪唑磷钼矾酸盐的制备及其催化玉米淀粉氧化[J].基因组学与应用生物学,2018,37(02):909-914.DOI:10.13417/j.gab.037.000909.
基金信息:
吉林市科技局青年基金项目(20156422);; 吉林化工学院项目共同资助
2017-10-20
2017-10-20
2017-10-20