立方体形α-Fe_(2)O_(3)光催化剂的合成及其可见光芬顿降解抗生素

Synthesis of cubicα-Fe_(2)O_(3) catalyst and its photo-Fenton degradation performance of antibiotic under visible light

抗生素的滥用和生产废水的无序排放造成了水体中抗生素污染问题日益严重。通过溶剂热法合成了立方体形貌的α-Fe_(2)O_(3)光芬顿催化剂,采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)等方法对其微观结构、物相等进行了表征。以盐酸四环素(TC)为模型抗生素污染物,研究了新型催化剂对TC的吸附和光芬顿降解性能,并探究了催化剂浓度、H_(2)O_(2)加入量、LED光源波长和pH等因素对TC降解效果的影响规律。结果表明,该工作成功合成出了粒径分布均一且具有立方体形貌的α-Fe_(2)O_(3),其对TC的吸附在30 min内即可达到平衡,吸附量可达7.06 mg/g。当TC的初始质量浓度为20 mg/L、α-Fe_(2)O_(3)催化剂的质量浓度为0.5 g/L时,采用可见光LED光源光芬顿降解30 min,TC的去除率可达80%以上。

The abuse of antibiotics and disordered discharge of production wastewater cause the pollution of antibiotics in the water.The cubic morphologyα-Fe_(2)O_(3) photo-Fenton catalyst was synthesized by solvothermal method,and its micro‐structure and physical properties were characterized by scanning electron microscopy(SEM),transmission electron micros‐copy(TEM),and X-ray diffraction(XRD).The adsorption and photo-Fenton degradation of TC by the new catalysts were in‐vestigated using tetracycline hydrochloride(TC)as a model antibiotic pollutant,and the effects of various factors including catalyst concentration,H_(2)O_(2) content,LED light wavelength,and pH on TC degradation removal were investigated.The re‐sults showed that the cubicα-Fe_(2)O_(3) with uniform particle size distribution was successfully synthesized and its adsorption on TC could reach equilibrium within 30 min,and the adsorption capacity could reach 7.06 mg/g.When the initial mass con‐centration of TC was 20 mg/L and the mass concentration ofα-Fe_(2)O_(3) catalyst was 0.5 g/L,the removal rate of TC could reach more than 80%by using visible LED light source photo-Fenton degradation for 30 min.