以芦苇秸秆为研究对象,在常压低温条件下利用碱性过氧化氢进行预处理实验的研究。在不同NaOH浓度、H2O2添加量、时间和温度下进行单因素实验,在单因素实验的基础上进行响应面优化实验得出最佳工艺条件为：NaOH浓度为1.38%,H2O2添加量为 1.67%,时间2.17 h,温度69 ℃,木质素的去除率为83.83%,纤维素、半纤维素保留率分别为91.69%和61.94%;对预处理残渣进行酶解,24 h酶解率为71.08%,已达到酶解平衡,相比较同等条件下的原料酶解率显著提升。通过显微傅里叶红外光谱、X-射线衍射、热重分析和扫描电镜等方法对原料和预处理残渣的分析表明,碱性过氧化氢体系对芦苇秸秆预处理能够有效脱除木质素和半纤维素,破坏原料的顽固性,促进酶解产糖效率。
Abstract
Reed straw was subjected to pretreatment using alkaline hydrogen peroxide under atmospheric pressure and low-temperature conditions. Single-factor experiments were conducted to investigate the effects of varying NaOH concentration, H2O2 addition amount, time and temperature. Response surface optimization experiments were subsequently performed, yilding the following optimal parameters： 1.38% NaOH, 1.67% H2O2, 2.17 hours, and 69 °C. Under these conditions, the lignin removal rate reached 83.83%, with cellulose and hemicellulose retention rates of 91.69% and 61.94%, respectively. The enzymatic hydrolysis of the pretreated residue achieved a 24-hour hydrolysis rate of 71.08%, significantly surpassing that of the untreated raw material under equivalent conditions, reaching enzymatic equilibrium. Analytical techniques, including Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy, were employed to analyze both raw materials and pretreatment residues. The results demonstrated that the alkaline hydrogen peroxide pretreatment effectively removed lignin and hemicellulose, disrupted the structural integrity of the raw material, and enhanced the efficiency of enzymatic hydrolysis for sugar production. These findings offer valuable technical insights into the high value-added utilization of reed straw.
关键词
生物质 /
碱性过氧化氢 /
酶解 /
预处理 /
木质素去除率
Key words
biomass /
alkaline hydrogen peroxide /
enzymolysis /
pretreatment /
lignin removal rate
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基金
国家重点研发计划（2022YFE0207100）
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