摘要
以Fe2 +/H2 O2 作为引发剂 ,将丙烯腈和木粉进行接枝共聚 ,得到丙烯腈 /木粉接枝共聚物 (PANW ) ,再经适度水解的方法合成阳离子交换树脂———羧基木粉。研究影响接枝共聚反应的各种因素和水解条件 ,并讨论羧基木粉对重金属离子和阳离子型染料的吸附特性。实验结果表明 :( 1)在适量引发剂 (FeSO4 ·7H2 O =1g)和适当温度 ( 60℃ )作用下 ,可得到较高接枝增量和接枝率的PANW ;( 2 )在PANW的水解反应中 ,在碱性催化剂作用下 ,可得到羧基含量高的产物 ,但收率较低 ;而在酸性催化剂作用下 ,则得到羧基含量低的产物 ,但收率较高 ;( 3)羧基木粉对阳离子型染料———碱性桃红的吸附容量与起始浓度有关 ,本实验中 ,羧基木粉对碱性桃红的吸附容量最高可达 50 0mg/g ,对Cu2 +的吸附容量最高可达 39mg/g ;( 4 )经 0 .3mol/LHCl再生4次后 ,羧基木粉对碱性桃红的吸附容量保持在 4 4 0mg/g以上 ,在含有多种金属离子的溶液中 。
In this study,carboxylic wood powder,a cationic exchanging resin,was prepared from hydrolysis of the grafted copolymer(PANW),which was prepared by reacting acrylonitrile with wood powder.Experiments on graft copolymerization and acid/alkaline hydrolysis of PANW were carried out to study the effects of dosage,temperature and time on the yield and properties of the products. Results show that acid value of carboxylic wood powder from alkaline hydrolysis is higher,but its yield is lower than that from acid hydrolysis. The adsorption capacity of carboxylic wood powder for basic pink dye increased with increase of the initial concentration of the adsorbate,and could be kept over 500 mg/g after repeated use and regeneration for 4 times.
出处
《林产化学与工业》
EI
CAS
CSCD
2001年第2期9-15,共7页
Chemistry and Industry of Forest Products
基金
江苏省自然科学基金资助项目 (BK99173)
