CAJ | 학술논문

分别使用具有相似羧基含量的海藻纤维、丙烯酸接枝改性聚四氟乙烯纤维和聚丙烯纤维( PAA-g-PP和PAA-g-PTFE)3种含羧酸纤维与Fe3+进行配位反应,研究和比较了反应的动力学特性及影响因素.将3种含羧酸纤维铁配合物分别作为非均相Fenton反应催化剂应用于染料降解反应中,分析和评价了其配位结构和表面性能对催化活性的影响.结果表明,在所涉及的温度和浓度范围内,3种含羧酸纤维与Fe3+的反应均很好地符合Langmuir等温吸附模型和Lagergren准二级动力学方程. Fe3+初始浓度的增加会降低反应速率常数,而反应温度的升高则会增加配合物中Fe3+的配合量.在相同反应条件下,海藻纤维比PAA-g-PP和PAA-g-PTFE更容易与Fe3+发生反应,且反应速率常数和Fe3+配合量按照下列顺序排列：海藻纤维>PAA-g-PP>PAA-g-PTFE.3种含羧酸纤维铁配合物都能够在染料氧化降解反应中作为非均相Fenton催化剂,且紫外光比可见光更能够提高其催化活性.海藻纤维铁配合物比其它2种含羧酸纤维铁配合物具有更好的催化作用,这与三者在配位结构和表面性能之间的显著差异有关.
분별사용구유상사최기함량적해조섬유、병희산접지개성취사불을희섬유화취병희섬유( PAA-g-PP화PAA-g-PTFE)3충함최산섬유여Fe3+진행배위반응,연구화비교료반응적동역학특성급영향인소.장3충함최산섬유철배합물분별작위비균상Fenton반응최화제응용우염료강해반응중,분석화평개료기배위결구화표면성능대최화활성적영향.결과표명,재소섭급적온도화농도범위내,3충함최산섬유여Fe3+적반응균흔호지부합Langmuir등온흡부모형화Lagergren준이급동역학방정. Fe3+초시농도적증가회강저반응속솔상수,이반응온도적승고칙회증가배합물중Fe3+적배합량.재상동반응조건하,해조섬유비PAA-g-PP화PAA-g-PTFE경용역여Fe3+발생반응,차반응속솔상수화Fe3+배합량안조하렬순서배렬：해조섬유>PAA-g-PP>PAA-g-PTFE.3충함최산섬유철배합물도능구재염료양화강해반응중작위비균상Fenton최화제,차자외광비가견광경능구제고기최화활성.해조섬유철배합물비기타2충함최산섬유철배합물구유경호적최화작용,저여삼자재배위결구화표면성능지간적현저차이유관.
Three carboxylic fibers including alginate fiber, polyacrylic acid grafted polypropylene and polyte-trafluoroethylene fibers ( PAA-g-PP and PAA-g-PTFE ) with similar carboxyl contents were coordinated with Fe3+, respectively to prepare the different Fe (Ⅲ)-carboxylic fiber complexes. The coordinating kinetics of three carboxylic fibers with Fe3+was compared, and the effecting factors were also examined. And the catalytic performance of three Fe(Ⅲ)-carboxylic fiber complexes was then evaluated as the heterogeneous Fenton cata-lysts in the dye degradation in water. The results indicated that within the observed temperature and concentra-tion range, the coordination of carboxylic fiber with Fe3+showed better agreement with Langmuir isotherm equa-tion and Lagergren second order equation. Increasing Fe3+initial concentration led to a low coordination rate constant. Higher temperature increased the Fe content of the resulting complexes. Alginate fiber reacted more easily with than PAA-g-PP and PAA-g-PTFE at the same conditions. Moreover, their coordination rate con-stants and Fe contents were ranked as follow: alginate fiber >PAA-g-PP >PAA-g-PTFE. Three Fe(Ⅲ)-car-boxylic fiber complexes acted as the heterogeneous Fenton catalysts for dye degradation. UV irradiation could more significantly enhance the catalytic capacity of the complexes than visible irradiation. Fe (Ⅲ)-alginate fiber complex has a higher catalytic performance than the other Fe(Ⅲ)-carboxylic fiber complexes with similar Fe content, which is in relation to the big difference in coordinating structure and surface property between them.