可见光照射下温敏锌酞菁共聚物光催化氧化对氯苯酚

将含有不饱和双键的四马来酰胺基锌酞菁（ZnMPc）与N-异丙基丙烯酰胺（NIPA）共聚，制备得到一种新型温敏锌酞菁共聚物光催化剂：P（NIPA—co—ZnMPc），采用差示扫描量热法测得其低临界溶解温度（LCST）为33．5℃．在可见光照射下利用氧气作为氧化剂，P（NIPA—co-ZnMPc）~g有效地催化氧化对氯苯酚（4-CP），与小分子ZnMPc相比，P（NIPA-co-ZnMPc）具有更高的光催化活性．两者在水溶液中的紫外．可见光谱图显示，共聚后大分子链的阻隔作用能有效地抑制酞菁分子的二聚，从而大大提高了其催化活性．温度对其光催化活性的实验结果显示，P（NIPA-co-ZnMPc）在其LCST附近具有最高的催化效率，说明催化剂的聚集态结构对其光催化活性产生直接影响，通过测定其在不同温度下的流体力学半径，可推测在其LCST附近发生了分子间的疏水聚集，会对4-CP起富集作用，从而加快了光催化反应速率．该光催化剂可通过均相催化异相分离实现循环利用，实验表明该催化剂具有较高的稳定性．

Photocatalytic oxidation of 4-chlorophenol using thermosensitive zinc phthalocyanine copolymer under visible light irradiation

A novel thermosensitive photocatalyst, P（NIPA-co-ZnMPc）, has been prepared using zinc tetra（N-carbonylacrylic） aminophthalocyanine（ZnMPc） to copolymerize with N-isopropylacrylamide （NIPA）. The lower critical solution temperature （LCST） of P（NIPA-co-ZnMPc） measured by differential scanning calorimetry （DSC） was 33.5℃. P（NIPA-co-ZnMPc） can catalyze the oxidation of 4-chlorophenols （4-CP） effectively using oxygen as oxidant under the visible light irradiation, and it has higher photocatalytic activity than ZnMPc under the same condition. The UV-Vis spectra of them in aqueous solution indicate that the macromolecular chains in P（NIPA-co-ZnMPc） restrain the aggregation of ZnMPc availably, resulting in the enhanced photocatalytic performance. The results of photocatalytic oxidation at different temperature show that P（NIPA-co-ZnMPc） presents the highest photocatalytic efficiency around the LCST, suggesting that the macromolecular structure of P（NIPA-co-ZnMPc） can directly influence their photocatalytic activity. The hydrodynamic radius of this copolymer at different temperatures implied the intermolecular hydrophobic aggregation around the LCST, which is advantageous for the enrichment and the photocatalytic oxidation of 4-CP. Due to the high stability of P（NIPA-co-ZnMPc）, it can be cyclic ally used in homogeneous photocatalytic oxidation and heterogeneous separation.