| 摘要: |
| 【目的】探求丝瓜络纳米纤维素晶体(Luffa sponge nanocellulose crystals,LNCC)的最优制备工艺，为提高丝瓜络资源的综合利用提供方法支持。【方法】以丝瓜络废弃物为原料，采用单因素试验研究不同硫酸质量分数(58%，60%，62%，64%，66%)、不同反应温度(30，40，50，60，70 ℃)、不同超声时间(25，35，45，55，65 min) 对超声 硫酸水解法制备LNCC得率的影响；在单因素试验的基础上，采用响应面试验对LNCC制备工艺条件进行优化，使用Design Expert 8.05b软件进行数据分析，求出数学模型，进而得到最佳的制备工艺条件。【结果】单因素试验结果显示，LNCC制备的最佳应温度为50 ℃，超声时间为45 min，硫酸质量分数为62%。建立了3个因素与LNCC得率的二次多项式回归模型，该模型拟合度良好，相关系数为99.95%，校正决定系数为99.88%。LNCC制备最佳的工艺条件为：硫酸质量分数62%，反应温度51 ℃，超声时间46 min；在该条件下制备的LNCC得率高达93.64%，与理论预测值(93.20%)吻合较好，表明建立的数学模型是合理有效的。【结论】建立了优化的LNCC制备工艺，该工艺可提高LNCC的得率。 |
| 关键词: 丝瓜络纳米纤维素晶体 响应面优化 得率 |
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| 基金项目:国家自然科学基金项目(31000276)；福建省高校杰出青年人才基金项目(JA11071)；福建省高校新世纪优秀人才基金项目(JA12088)；福建农林大学杰出青年基金项目(xjq201208) |
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| Optimizing preparation process for Luffa sponge nanocellulose crystals |
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WU Qiao-mei,WANG Jia-lun,LIU Xiao-ze,et al
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| Abstract: |
| 【Objective】This study investigated the optimal preparation process for Luffa sponge nanocellulose crystals (LNCC) to provide methodological support for comprehensive utilization of Luffa sponge.【Method】Using waste Luffa sponge as raw material,the influences of sulfuric acid concentration (58%,60%,62%,64% and 66%),reaction temperature (30,40,50,60 and 70 ℃),and time of ultrasonic process (25,35,45,55 and 65 min) on yield of LNCC by method of ultrasonic-sulfuric acid were investigated with single-factor experiments.Then,preparation conditions were optimized using response surface methodology.The results were analyzed by Design-Expert 8.05b to obtain mathematical model and the optimal conditions were determined.【Result】Single-factor experiments showed that the optimal conditions were: reaction temperature 50 ℃,time of ultrasonic process 45 min,and sulfuric acid concentration 62%.The established quadratic polynomial regression equations of 3-factor and LNCC yield by response surface methodology were well fit with correlation coefficient and corrected determination coefficient of 99.95% and 99.88%,respectively.The optimal conditions for LNCC were:reaction temperature 51°C,time of ultrasonic process 46 min,and sulfuric acid concentration 62%.The actual yield of LNCC (93.64%) was in good agreement with prediction (93.20%),indicating the established model was reasonable and effective.【Conclusion】Optimal preparation conditions of LNCC were determined and high yield was obtained. |
| Key words: Luffa sponge nanocellulose crystals response surface methodology yield |
