Performances of waste paper cellulose/SiO2 composite aerogel

doi:10.11949/j.issn.0438-1157.20180916

Abstract

Abstract:

The waste paper cellulose was treated, and the cellulose/SiO₂ composite hydrogel was prepared by using methyltrimethoxysilane (MTMS) as a silicon source, and freeze-dried to obtain a cellulose/SiO₂ composite aerogel having good performance. The prepared aerogels were characterized by scanning electron microscopy (SEM), contact angle measuring instrument and thermogravimetric analysis (TGA). The results show that the material consists of macropores, mesopores, and micropores with a minimum density of 0.107 g/cm³, which has good hydrophobic properties, static hydrophobic contact angle of up to 148.5°, good mechanical properties, and 100% recovery after compression in 50% range. The material has good adsorption performance, and the adsorbed oil can reach 12.7 times of its own quality, and the thermal stability is improved. It has broad application prospects in the treatment of organic wastewater, especially water pollution.

Key words: cellulose, aerogel, composite material, adsorption, elasticity, hydrophobic

摘要：

对废纸纤维素进行处理，以甲基三甲氧基硅烷（MTMS）作为硅源，制备纤维素/SiO₂复合水凝胶，经过冷冻干燥得到性能良好的纤维素/SiO₂复合气凝胶。利用扫描电镜（SEM）、接触角测量仪及热重分析（TGA）等对制得的气凝胶进行了表征测试。结果显示材料由大孔、介孔、微孔组成，最低密度为0.107 g/cm³，具有较好的疏水性能，静态疏水接触角可达148.5°，力学性能良好，可实现50%范围内压缩后100%恢复，材料具备良好的吸附性能，吸附油污可达到本身质量的12.7倍，热稳定性提高。在处理有机废水，尤其是水体油污方面有着广阔的应用前景。

关键词: 纤维素, 气凝胶, 复合材料, 吸附, 弹性, 疏水

CLC Number:

TQ 35

Yuhan ZHOU, Xiaoyu CHEN, Cheng ZUO, Qingjie GUO, Jun ZHAO. Performances of waste paper cellulose/SiO₂ composite aerogel[J]. CIESC Journal, 2019, 70(3): 1120-1126.

周钰寒, 陈晓玉, 左成, 郭庆杰, 赵军. 废纸纤维素/SiO₂复合气凝胶的性能[J]. 化工学报, 2019, 70(3): 1120-1126.

Figures/Tables 10

Table 1 Influence of cellulose content and pH on aerogel materials

Sample number	Cellulose content/%(mass)	pH	Density/(g/cm³)	Porosity/%
1	5	4	0.167	78.6
2	10	4	0.146	82.7
3	15	4	0.122	89.2
4	20	4	0.107	91.5
5	20	7	0.102	90.4
6	20	10	0.104	90.1

Fig.1 SEM of cellulose/SiO2 composite aerogel material with different cellulose content and different hydrolysis pH

Fig.2 Derivative TGA curves of cellulose aerogel and cellulose/SiO2 composite aerogel materials

Fig.3 Compression springback photographs of cellulose/SiO2 composite aerogels

Fig.4 Organization chart of cellulose/SiO2 composite aerogels

Fig.5 Contact angle of cellulose /SiO2 composite aerogel materials with different cellulose content

Fig.6 Oil absorbency rate of cellulose /SiO2 composite aerogel

Fig.7 Adsorption capacity of cellulose / SiO2 composite aerogel to different oil varied with time

Fig.8 Adsorption capacity of cellulose / SiO2 composite aerogel to different oil

Fig.9 Recyclability of cellulose / SiO2 composite aerogel

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Performances of waste paper cellulose/SiO₂ composite aerogel

废纸纤维素/SiO₂复合气凝胶的性能

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