2,4-二氯苯酚在炭载铜和铁催化剂上的微波降解

Microwave decomposition of 2,4-dichlorophenol adsorbed on GAC-supported copper and iron catalysts

采用微波加热的方法制备了炭载铜、铁催化剂,并对其进行了X射线衍射(XRD)、X光电子能谱(XPS)、扫描电镜(SEM)表征,考察了2种催化剂对2,4-二氯苯酚(2,4-DCP)微波降解的反应活性并记录了反应床层的温升过程.结果表明,元素铜和铁分别以金属及氧化物的形式均匀地附着在活性炭表面;炭载铁催化剂对2,4-DCP的微波降解具有较大的反应活性,反应过程中床层温升迅速,而炭载铜催化剂对2,4-DCP的微波降解活性较弱,反应床层温升较慢,造成这种差别的主要原因是由于活性炭表面铁及铁的氧化物具有较强的微波吸收性能,在微波场中可促使床层温度的迅速升高,进而促进了2,4-DCP的微波降解,而活性炭表面载铜时则起相反的作用.

Granular activated carbon （GAC）-supported copper and iron catalysts were prepared by microwave irradiation and characterized by X-ray diffraction （XRD）,X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy （SEM）. The activities of these two catalysts for 2,4-dichlorophenol （2,4-DCP） decomposition were studied in the presence of microwave irradiation,and the temperature rising courses of the catalyst beds were recorded by a sheltered type-K thermocouple. Results show that elemental copper and iron are highly dispersed on the surface of GAC in the forms of element and oxide. GAC-supported iron catalyst shows desirable activity in the decomposition of 2,4-DCP under microwave irradiation and the temperature of catalyst bed rises quickly,but GAC-supported copper catalyst gives the counteractive effect. The main reason for this difference is that the role of powder iron and its oxide are suggested to adsorb microwave irradiation more intensively,so the temperature rising of catalyst bed is promoted during microwave irradiation,which facilitating the microwave decomposition of 2,4-DCP,while copper brings the negative effect.