三种配合物微晶的尺寸可控合成及其光催化性质（英文）

Three Coordination Polymer Microcrystals: Size-Controlled Syntheses and Photocatalytic Properties

以4,4′-二苯醚二甲酸和4,4′-联吡啶为配体,通过调节水热反应的条件,如三乙胺的加入量,反应时间和反应温度等因素,可控合成了尺寸从10到250μm的Ni(Ⅱ)、Co(Ⅱ)和Zn(Ⅱ)3种配合物微晶,其尺寸、形貌和结构用扫描电镜和X射线粉末衍射进行了表征和分析。光催化性能测试表明3种配合物对有机染料罗丹明B、甲基橙和亚甲基蓝均具有杰出的降解能力,且随着配合物晶粒尺寸减小其催化能力明显提高。最引人注目的是尺寸为30μm的Ni(Ⅱ)配合物,其光催化性降解Rh B染料的能力已超越纳米TiO_2。此外,X射线粉末衍射表明,在一次光降解过程后配合物结构保持稳定,可作为重复利用的光催化剂。

Microcrystals of Ni（Ⅱ）, Co（Ⅱ） and Zn（Ⅱ）coordination polymers based on 4,4＇-oxybisbenzoic acid （oba） and 4,4＇-bipyridine （4,4＇-bpy） with sizes ranging from 10 to 250 μm were prepared hydrothermally by regulating the amount of NEt3, reaction time and reaction temperature. The crystal sizes, morphologies and structures were characterized and analyzed by scanning electron microscopy （SEM） and X-ray powder diffraction （XRPD）. Photocatalytic measurements demonstrate that three polymers have excellent degradation capacities of organic dyes such as rhodamine B （RhB）, methyl orange （MO） and methylene blue （MB） and the degradation rate increases with the decrease of catalyst sizes. Remarkably, the photocatalytic performance of Ni（Ⅱ） complex （30 μm） for RhB exceeds that of the nano-sized TiO2 under same experimental conditions. In addition, XRPD studies show three coordination polymers are structurally stable after one cycle of photodegradation and thus can be utilized repeatedly as photocatalysts.