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摘要
以微晶纤维素(MCC)为原料,利用NaOH/尿素/H2O作为溶剂体系,采用溶胶-凝胶和冷冻干燥反应制备纤维素气凝胶,再以氨丙基三甲氧基硅烷(APS)为改性剂,对纤维素气凝胶进行氨基化修饰,通过红外光谱和扫描电镜对合成产物进行表征,并探讨吸附剂用量、初始浓度、吸附剂用量、溶液pH和吸附时间等参数,考察合成的氨基硅烷改性纤维素气凝胶对Zn2+的吸附效果。结果表明:当初始浓度为400mg/L,吸附时间为150min,吸附剂用量为0.4g,pH为6,吸附量达到最大值为45.1mg/g,吸附效果较好,可为实际处理Zn2+污染提供理论依据。
Abstract
Aminosilane modified cellulose aerogels were prepared by sol-gel method and freeze-drying method using microcrystalline cellulose(MCC)as raw material,NaOH/urea/H2O as green solvent system,and aminopropyltrimethoxysilane (APS) was modifying agent that aminated the surface of cellulose aerogels.Infrared spectroscopyand scanning electron microscopy were used to characterize the product,and then investigation of Zn2+ adsorption effect of the aerogels under adsorbent dosage,initial concentration,adsorbent dosage,solution pH value and adsorption time.The results showed that when the initial concentration was 400mg/L,the adsorption time was 2.5h,the aerogel amount was 0.4g,the pH was 6,and the maximum adsorption amount was 45.1mg/g.The adsorption effect was good and and it can provided a theoretical basis for the actual treatment of Zn2+ pollution.
关键词
微晶纤维素
/
氨基硅烷改性
/
NaOH/尿素/H2O
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溶胶-凝胶
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气凝胶
/
锌离子
Key words
microcrystalline cellulose
/
aminosilane modification
/
NaOH/urea/H2O
/
sol-gel
/
aerogel
/
zinc ion
氨基硅烷改性纤维素气凝胶的合成及其吸附性能研究[J].
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基金资助
国家自然基金地区基金(51762041);国家自然基金青年项目(51602275)
