林业科学 ›› 2021, Vol. 57 ›› Issue (7): 150-157.doi: 10.11707/j.1001-7488.20210716
杨利梅1,2,刘杏娥1,江泽慧1,田根林1,杨淑敏1,尚莉莉1,*
收稿日期:
2020-01-07
出版日期:
2021-07-25
发布日期:
2021-09-02
通讯作者:
尚莉莉
基金资助:
Limei Yang1,2,Xing Liu1,Zehui Jiang1,Genlin Tian1,Shumin Yang1,Lili Shang1,*
Received:
2020-01-07
Online:
2021-07-25
Published:
2021-09-02
Contact:
Lili Shang
摘要:
目的: 研究单叶省藤材水分吸附的变化规律,阐明藤材内部水分吸附变化的深层机理,为解决藤材安全贮存与合理加工利用过程中由水分吸附和散失引起的质量问题提供理论依据。方法: 采用动态水蒸气吸附仪测定藤材的水分吸附行为,选择H-H模型、GAB模型、Halsey模型、Henderson模型、Oswin模型和Smith模型对平衡含水率(EMC)数据进行非线性拟合并评价其拟合效果,运用最佳拟合模型分析水分吸附过程中平衡含水率、单分子层吸附水和多分子层吸附水的变化规律。结果: 单叶省藤材水分吸附等温线呈"S"形,属于第Ⅱ类等温线,具有多分子层吸着特性;与木、竹材相似,单叶省藤材在整个吸湿过程中表现出明显的吸湿滞后现象,且其吸滞滞后率在相对湿度(RH)80%时达0.8,早于木材(RH=95%);6种模型中,H-H模型和GAB模型对数据的拟合度最高,R2均高于0.99;H-H模型中代表含有单位摩尔数吸附位的绝干藤材质量参数(W1)显著低于木、竹材,在吸湿阶段,当RH < 60%时,主要以单分子层吸附为主,单分子层吸附水含量为6.80%;通过GAB模型计算得出藤材吸湿阶段的水分可及内比表面积(S)和单分子层吸附水含量(W0)分别为293 m2·g-1和7.67%,均大于木、竹材,分析其原因可能是单叶省藤材的纤维细胞壁薄腔大,相邻薄壁细胞之间的空隙较大且结晶度较小;由H-H模型和GAB模型推测出的纤维饱和点(FSP)分别为20.28%和18.67%。结论: H-H模型和GAB模型可用于描述单叶省藤材水分吸附等温线,拟合度较高;单叶省藤材的化学组分含量、解剖构造和结晶度是影响其单分子层吸附水含量的主要因素,单叶省藤材单分子层吸附水含量略高于竹材,水分可及内比表面积大于竹材。
中图分类号:
杨利梅,刘杏娥,江泽慧,田根林,杨淑敏,尚莉莉. 单叶省藤材水分吸附特性[J]. 林业科学, 2021, 57(7): 150-157.
Limei Yang,Xing Liu,Zehui Jiang,Genlin Tian,Shumin Yang,Lili Shang. Water Adsorption Characteristics of Calamus simplicifolius Cane[J]. Scientia Silvae Sinicae, 2021, 57(7): 150-157.
表1
常用的等温吸湿解吸模型①"
模型Model | 表达式Expression | |
H-H | (1) | |
GAB | (2) | |
Halsey | (3) | |
Henderson | (4) | |
Oswin | (5) | |
Smith | (6) |
表3
各模型的系数、拟合效果及评价指标"
模型Model | W1(W0,a) | K1(C,b) | K2(K,c) | R2 | |
吸湿Adsorption | H-H | 327.98 | 6.80 | 0.74 | 0.992 8 |
GAB | 7.67 | 5.42 | 0.74 | 0.994 3 | |
Halsey | 153.79 | 2.68 | 0.947 5 | ||
Henderson | 1.33×1044 | -46.07 | 0.099 1 | ||
Oswin | 7.72 | 0.32 | 0.978 0 | ||
Smith | 2.89 | 5.72 | 0.937 6 | ||
解吸Desorption | H-H | 174.19 | 4.95 | 0.53 | 0.994 6 |
GAB | 10.33 | 5.95 | 0.53 | 0.994 6 | |
Halsey | 1 110.41 | 3.29 | 0.888 9 | ||
Henderson | 1.31×1045 | -43.74 | 0.163 8 | ||
Oswin | 9.64 | 0.26 | 0.935 0 | ||
Smith | 4.42 | 5.72 | 0.832 9 |
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