Microwave-Assisted Hydrolysis of Cellulose in Towel and Wheat Straw Using Freeze-Thawing with NaOH
Microwave-Assisted Hydrolysis of Cellulose in Towel and Wheat Straw Using Freeze-Thawing with NaOH
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DOI：
10.1007/s12649-020-01219-7
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发表时间：
2020-09
影响因子：
3.2
通讯作者：
C. Sasaki;Yuka Sumitomo;Kai Odashima;C. Asada;Y. Nakamura
中科院分区：
文献类型：
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作者：
C. Sasaki;Yuka Sumitomo;Kai Odashima;C. Asada;Y. Nakamura
目的研究微波直接水解棉巾和麦秸中葡萄糖的高产率。方法为了达到这种效果，在MW处理前加入3% NaOH冷冻解冻。测试了多个MW参数。结果经200℃、2%硫酸催化、30 s的MW处理后，经3% naoh处理后的毛巾的葡萄糖收率最高，为42.4%。根据处理后样品的纤维素含量，这相当于44.4%的产率，比仅在200°C下以1%硫酸作为催化剂进行MW处理7分钟的样品高1.3倍（我们之前报告的最大葡萄糖产率）。对于麦秸，以3% naoh处理的样品进行冻融，葡萄糖收率最高，为27.0%；以0.5%硫酸为催化剂，在200℃、3 min条件下进行MW处理，纤维素含量最高，为41.9%。在此条件下，生毛巾和麦秸的葡萄糖得率分别为40.5%和14.7%。结论综合严重性参数分析表明，在MW处理前添加NaOH冻融可提高葡萄糖产量，降低处理条件的严重性。综上所述，在MW处理前，用3% NaOH进行冻融对直接水解毛巾和麦秸中的葡萄糖是有效的。图形抽象
PurposeThe aim of this study was to produce a high yield of direct hydrolysis of glucose from a cotton towel and wheat straw by microwave-assisted (MW) treatment.MethodsTo this effect, a freeze-thawing with 3% NaOH was added before MW treatment. Multiple MW parameters were tested.ResultsFor the towel, the highest glucose yield of 42.4% based on freeze-thawing with 3% NaOH-treated sample was observed after MW treatment at 200 °C for 30 s with 2% sulfuric acid as a catalyst. This corresponded to a 44.4% yield based on the cellulose content of treated samples, which was 1.3-fold higher than that of samples treated only by MW at 200 °C for 7 min with 1% sulfuric acid as a catalyst (maximum glucose yield in our previous report). For wheat straw, the highest glucose yield of 27.0% based on freeze-thawing with 3% NaOH-treated sample, and 41.9% based on the treated sample cellulose content were observed after MW treatment at 200 °C for 3 min with 0.5% sulfuric acid as a catalyst. Under the optimum conditions, the glucose yield was 40.5% from raw towel and 14.7% from wheat straw.ConclusionCombined severity parameter analysis revealed that the addition of freeze-thawing with NaOH before the MW treatment increased the glucose yield and reduced the severity of the treatment conditions. In conclusion, freeze-thawing using 3% NaOH before MW treatment is effective for the direct hydrolysis of glucose from towels and wheat straw.Graphic Abstract