钴基金属有机骨架材料/钛基复合材料的合成及其可见光催化降解机理

Synthesis of Co-based metal-organic framework materials/Ti-based composite materials and its photocatalytic degradation mechanism under visible-light

采用原位合成法将基于3,5-吡啶二羧酸配体的一维钴基金属有机骨架材料(CP)负载到预合成的TiO_(2)^(-)TiOF2(TOF)上,制备得到复合光催化剂CP/TOF。考察了该催化剂在模拟太阳光条件下催化降解盐酸四环素(TCH)的活性,并表征了其物理化学特性。实验结果表明:CP/TOF催化剂的催化活性顺序为5%CP/TOF>20%CP/TOF>3%CP/TOF>10%CP/TOF;在催化剂投加量为0.3 g/L、TCH质量浓度为10 mg/L的条件下反应120 min,TCH去除率分别为88%、84%、83%和82%;光催化反应过程中的主要活性物种为·O_(2)^(-),CP/TOF光催化降解TCH的途径符合Z型异质结催化降解机理。

The one-dimensional Co-based metal organic framework Co-PYDC(CP)was loaded onto the pre-synthesized TiO_(2)^(-)TiOF2(TOF)to prepare the composite photocatalyst CP/TOF by in-situ synthesis method.The photocatalytic activity of the catalyst was investigated by degrading tetracycline hydrochloride(TCH)under simulated sunlight,and its physicochemical properties were characterized.The experimental results show that:The catalytic activity of CP/TOF catalysts is in the order of 5%CP/TOF>20%CP/TOF>3%CP/TOF>10%CP/TOF;Under the conditions of catalyst amount 0.3 g/L,TCH mass concentration 10 mg/L and reaction time 120 min,the TCH removal rate is 88%,84%,83%and 82%,respectively;The predominant active species in the photocatalytic reaction process is·O_(2)^(-).The pathway of photocatalytic degradation of TCH by CP/TOF is consistent with the catalytic mechanism by Z-type heterojunction.