摘要
以聚乙烯醇、二乙烯基苯和二甲基丙烯酸乙二醇酯为原料,采用悬浮聚合法和悬挂双键后交联法,选用不同的制孔剂,制备出4种不同树脂,并考察了4种树脂作为香草醛吸附介质的吸附性能,并优选出香草醛平衡吸附容量最高的树脂。通过FTIR、XPS、SEM表征其结构组成和表面形貌;结合吸附热力学和动力学,分析其在香草醛水溶液中的静态吸附行为,并考察其吸附-解吸循环中的吸附稳定性。结果表明,以甲苯为制孔剂制备的后交联聚二乙烯基苯-共乙二醇二甲基丙烯酸酯树脂(PCL-PDE)对香草醛具有最优的吸附性能,在吸附温度25℃、香草醛溶液初始质量浓度1.0 g/L、固液比1∶100,吸附时间4 h的条件下,PCL-PDE对香草醛的平衡吸附容量高达79.3 mg/g湿PCL-PDE;PCL-PDE对香草醛的吸附过程是一个先快后慢的自发(ΔG<0)、放热(ΔH<0)物理过程,可在180 min内达到吸附平衡。PCL-PDE在吸附-解吸5次循环过程中,其吸附性能稳定不变。
Using polyvinyl alcohol,divinylbenzene and ethylene glycol dimethacrylate as raw materials,four different resins were prepared as adsorption medium for vanillin by suspension polymerization and suspension double bond post-crosslinking method using different pore-making agents,and evaluated for their vanillin adsorption performance,of which the one with the highest equilibrium vanillin adsorption capacity was selected.Its structure composition and surface morphology were characterized by FTIR,XPS and SEM,while its static adsorption behavior in vanillin aqueous solution was analyzed from the aspects of adsorption thermodynamics and kinetics,with its adsorption stability in the adsorption-desorption cycle further assessed.The results showed that the post-cross-linked polydivinylbenzene-co-ethyleneglycol-dimethacrylate(PCL-PDE) resin prepared using toluene as pore-making agent exhibited the highest adsorption performance for vanillin.Under the conditions of adsorption temperature 25 ℃ and initial mass concentration of vanillin solution 1.0 g/L,the equilibrium adsorption capacity of PCL-PDE for vanillin reached as high as 79.3 mg/g wet PCL-PDE.The adsorption process of vanillin by PCL-PDE was a fast and then slow spontaneous(ΔG < 0) and exothermic(ΔH < 0) physical process,reaching adsorption equilibrium within 180 min.The adsorption performance of PCL-PDE remained stable during 5 cycles of adsorption-desorption.
作者
邱全源
胡蕾
曾越任
刘泾柯
宋九航
林晓清
QIU Quanyuan;HU Lei;ZENG Yueren;LIU Jingke;SONG Jiuhang;LIN Xiaoqing(School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Guangdong Provincial Key Laboratory of Plant Resources Biorefinery,Guangzhou 510006,Guangdong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2024年第12期2682-2692,2736,共12页
Fine Chemicals
基金
国家自然科学基金项目(21978053,51508547)
广东省重点领域研发计划项目(2020B0101070001)。
关键词
香草醛
吸附
超高交联吸附树脂
动力学
热力学
分离技术
vanillin
adsorption
hyper-crossed-linked adsorption resin
kinetics
thermodynamics
separation technology
