大豆膳食纤维改性及其对阳离子染料吸附特性  

Modification of soybean dietary fiber and its adsorption to cationic dyes

作　　者：吴称意[1,2] 卲宇 方敦[2] 孟倩茹 彭枫[2] 

机构地区：[1]湖北民族学院生物资源保护与利用湖北省重点实验室,恩施445000 [2]湖北民族学院化学与环境工程学院,恩施445000

出　　处：《环境工程学报》2015年第6期2802-2806,共5页Chinese Journal of Environmental Engineering

基　　金：湖北省自然科学青年基金项目(2014CFB618);湖北民族学院科研团队项目(MY2014T007);湖北民族学院博士科研启动基金(MY2013B017))

摘　　要：对大豆膳食纤维进行了羧甲基化改性,并利用红外光谱(FT-IR)和扫描电镜(SEM)对其结构进行了表征。研究了羧甲基化大豆膳食纤维用量、吸附时间、吸附温度、溶液p H值等因素对其吸附亚甲基蓝、结晶紫和品红效果的影响。结果表明,当吸附温度为25℃、羧甲基化大豆膳食纤维浓度为20 mg/L、溶液p H值为6.8和吸附时间为60 min时,羧甲基化大豆膳食纤维对亚甲基蓝、结晶紫和品红的去除率分别达到96.4%、95.6%和94.7%。另外,此吸附过程较好地符合Langmuir和Freundlich等温吸附模型。In this study,soybean dietary fiber( SDF) was modified by carboxymethylation,and characterized by Fourier transform infrared spectra( FT-IR) and scanning electron microscope( SEM). The obtained carboxymethyl soybean dietary fiber( CSDF) was applied to remove methylene blue,magenta and crystal violet in aqueous solution. Some influencing factors,such as absorbent dosage,contact time,temperature and p H value,were investigated in details. The results showed that the optimum conditions for adsorption of dyes are 20 mg / L of adsorbent,p H of 6. 8,contacting 60 min at 25℃. The removal rate got to 96. 4% of methylene blue,95. 6%of crystal violet and 94. 7% of magenta. Meanwhile,it was found that adsorption mechanism fit Langmuir and Freundlich model.

关 键 词：羧甲基化大豆膳食纤维 吸附 去除率 阳离子染料 

分 类 号：X788[环境科学与工程—环境工程]