摘要
本文利用腈纶纤维(PANF)便于回收、易于修饰、价格低廉等优点,通过不同链长卤代烃的季铵化反应,构建系列极性可调的功能化腈纶纤维,通过红外光谱、扫描电镜、X-射线衍射等技术进行表征,并研究纤维表层极性调控对水体磷酸盐的吸附性能的影响。结果表明,正溴丁烷修饰的季铵化纤维(PAN_(T-C4)F)对磷的吸附能力(25 mg·g^(−1)P)优于正溴己烷和正溴辛烷修饰的季铵盐功能化纤维(PAN_(T-C6)F、PAN_(T-C8)F)。改性纤维材料的吸附动力学更符合准二级动力学模型,吸附等温线采用Langmuir模型拟合更优,说明功能化纤维对磷的去除主要为单分子层化学吸附。PAN_(T-C4)F在pH 7左右时,对磷的吸附效果最好,且3 min达到平衡,因此具有较高的吸附效率。此外,PAN_(T-C4)F吸附的磷酸盐可以在NaCl溶液中解吸附,至少可以循环5次以上,实现功能化纤维的循环利用和磷的有效回收。研究表明,PAN_(T-C4)F是一种高效的水体磷酸盐吸附材料,具有较高的实际应用价值。
This study utilized the characteristic of polyacrylonitrile fiber(PANF)which can be easily recycled and modified with low price,we constructed a series of polarity regulable functional polyacrylonitrile fibers by the quaternary ammonium reaction with halogenated hydrocarbons of different chain lengths,which was characterized by FTIR,SEM and XRS,the adsorption ability effect of polar regulation on water phosphate was also be investigated.The results showed that phosphorus adsorption capacity(25 mg·g^(−1) P)of n-brombutane modified quaternary ammonium fibers(PAN_(T-C4)F)was better than quaternary ammonium fibers modified with n-bromhexane and n-bromocane(PAN_(T-C6)F、PAN_(T-C8)F).The second-order plot for modified polyacrylonitrile fiber materials are more suitable to describe the adsorption kinetics,and the Langmuir model are better to fit the adsorption isotherms,which indicate the phosphorus adsorption by functional fibers is mainly occurred through single molecular layer chemisorption.When the pH was about 7,the functional fibers had the best adsorption effect on phosphorus,and reached the balance of suction in 3 min which proved it has high adsorption efficiency.In addition,those phosphate adsorbed by PAN_(T-C4)F can be desorbed in NaCl solution to realize the recycling of functionalized fibers and the effective recovery of phosphorus at least 5 times,the results showed the PAN_(T-C4)F is a kind of high efficient material for phosphorus adsorption in wastewater with high practical application value.
作者
吴语潇
杨甜
徐武松
熊启中
徐刚
叶新新
郜红建
WU Yuxiao;YANG Tian;XU Wusong;XIONG Qizhong;XU Gang;YE Xinxin;GAO Hongjian(Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention,Key Laboratory of JiangHuai Arable Land Resources Protection andEco-restoration,Research Centre of Phosphorous Highly Efficient Utilization and Water Environment Protection Along the Yangtze River Economic Zone,College of Resources and Environment,Anhui Agricultural University,Hefei,230036,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第12期3898-3908,共11页
Environmental Chemistry
基金
安徽省自然科学基金(1908085QB87)
国家级大学生创新训练项目(202110364080)资助。
关键词
腈纶纤维
极性
季铵化
吸附
磷酸盐
polyacrylonitrile fibers
polarity
quaternization
adsorption
phosphate
