CuO/ZnO复合光催化剂降解海水养殖废水中盐酸四环素

Photocatalytic degradation of tetracycline hydrochloride in mariculture wastewater by CuO/ZnO composite photocatalyst

为降解海水养殖废水中盐酸四环素,采用沉淀法自制CuO/ZnO复合光催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外—可见漫反射(UV-Vis DRS)等表征手段对其进行表征,得到CuO/ZnO复合光催化剂的粒径、外貌特征以及光吸收范围。可见光照射下,考察了CuO/ZnO复合光催化剂投加量、煅烧温度、掺杂比(ZnO和CuO摩尔比)、过氧化氢浓度、反应时间以及盐酸四环素初始浓度6项因素对光催化降解海水养殖废水中盐酸四环素的影响。通过正交试验得到CuO/ZnO复合光催化剂降解盐酸四环素的优化反应条件为:海水养殖废水中含有的盐酸四环素初始质量浓度为0.025 g/L,过氧化氢质量浓度为0.5 g/L,掺杂比为10∶1,煅烧温度为550℃,CuO/ZnO复合光催化剂投加量为0.15 g/L,可见光下反应3.5 h。在此条件下海水养殖废水中盐酸四环素的平均去除率可达93.01%。

In order to degrade tetracycline hydrochloride in mariculture wastewater,CuO/ZnO composite photocatalyst was prepared by precipitation method,and characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),ultraviolet-visible diffuse reflection(UV-Vis DRS).The particle size,appearance characteristics and light absorption range of CuO/ZnO composite photocatalyst were obtained.The effects of dosage,calcination temperature,doping ratio(ZnO and CuO molar ratio),hydrogen peroxide concentration,reaction time and initial concentration of tetracycline hydrochloride on photocatalytic degradation of tetracycline hydrochloride were investigated under visible light irradiation.The optimal reaction conditions for the degradation of tetracycline hydrochloride by CuO/ZnO composite photocatalyst were determined by orthogonal experiment,which were as follows:the initial concentration of tetracycline hydrochloride contained in the mariculture wastewater 0.025 g/L,the hydrogen peroxide concentration 0.5 g/L,the doping ratio 10∶1,the calcination temperature 550℃,the dosage 0.15 g/L,and the reaction time 3.5 h in visible light.Under the optimized conditions,the average removal rate of tetracycline hydrochloride in mariculture wastewater was 93.01%.