分子印迹型FentoN-like催化剂的制备及其选择性性能研究.docx

30℃，此时实验条件较为适宜。此外，碱性条件下吸附效果较好，这可能是因为碱性时的絮凝作用。MI．FZ对Ⅷ的吸附行为符合Langmuir模型和拟 30℃，此时实验条件较为适宜。此外，碱性条件下吸附效果较好，这可能 是因为碱性时的絮凝作用。MI．FZ对Ⅷ的吸附行为符合Langmuir模型和拟 二级吸附动力学方程，且主要为化学吸附。 (3)MI．FZ对目标分子MB具有选择吸附能力。FZ对MB的平衡吸附量 (15．7 mg／g)约为FZ(44．4 mg／g)的3倍，而FZ对BPA的吸附量明显高于 MI．FZ；混合溶液中，MI．FZ对MB的平衡吸附率为44．7％，远大于其对BPA 的吸附率14．9％，而FZ对BPA的吸附率增至21％，对MB的吸附率减至28．8％。 (4)催化剂投加量、过氧化氢投加量、pH和温度会对MI．FZ催化MB产 生影响。催化剂投加量为0．3 g／L，初始pH为4，过氧化氢投加量为0．16 mol／L， 反应温度为30℃，此时实验条件较为适宜。一级反应动力学方程能更好地 描述MI．FZ和FZ对MB的催化降解过程。 (5)MI-FZ对MB的具有选择催化能力。FZ对MB的降解率为92．2％，远 大于FZ的76．6％；对干扰物BPA，FZ的降解效率高达99．8％，远远大于MI．FZ 的56．4％，表明印迹后MI。FZ对目标分子MB的催化效率增强，而对非目标物 质的催化效率降低。混合溶液中，MI．FZ对MB的降解率(82．7％)远大于 BPA(37．8％)，而FZ对MB的降解率降至53．8％，对BPA的降解率增至1J73．5％， 进一步证明了催化剂的选择性。 (6)MI．FZ具有较好的使用寿命。在六次重复催化试验中，MI．FZ对MB 的催化效率保持在87．0±5．O％。 关钺司：分子印迹Fenton-Hke选择性氧化吸附亚甲基董 万方数据 PREnURATIoN PREnURATIoN oF MoLECULAR玎垣PR小TED FENToN．LIK：E C ATAI YST AND ITS A．PPLICATIoN IN SELECTrⅥTY ABSTRACT As heterogeneous Fenton-like process yield highly reactive and non．selective hydroxyl radical(·OH)by iron interacted with hydrogen peroxide， it iS stiU difficult to realize selective removal of harmful materials from complicated wastewaters in the presence of other pollutants．Molecular imprinted materials have been extensively studied due to their molecular recognition ability,this inspires US to study the molecular imprinted heterogeneous Fenton-like catalyst for selective removal of the organic pollutants．The molecular imprinted material was prepared with 4A zeolite as the base and methylene blue(MB)as the template molecules．After imprinted，the template molecule was washed out and iron ions were introduced to form the Fenton—like sites．Then，the molecule imprinted Fe-zeolite Fenton—like catalyst (MI—FZ)Was prepared．The Fe—immobilized zeolite catalyst without molecular imprinted(FZ)was also prepared for comparison．IvlI-FZ and FZ were characterized by SEM，XRD，BET and FT-IR．Besides，adsorptive and catalytic conditions of MI—FZ for MB were optimized．Bisphe