Sb-SnO_2/炭膜对水中四环素电催化降解性能研究

Study on Electrocatalytic Degradation Performance of Aqueous Tetracycline by Using Sb-SnO_2/Carbon Electrocatalytic Membrane

以炭膜为基膜,通过溶胶凝胶法制备了载有纳米Sb掺杂SnO_2的Sb-SnO_2/炭膜电催化膜,通过SEM、TEM和XRD对基膜和Sb-SnO_2/炭膜进行了结构表征及降解水中四环素实验。结果表明,基膜和Sb-SnO_2/炭膜都具有多微孔的表面结构,粒径约为10 nm的Sb-SnO_2均匀涂覆在炭膜表面且Sb-SnO_2为四方形金红石结构,与基膜相比,Sb-SnO_2/炭膜提高了对水中四环素的吸附性能;在电压为2.5 V直流电场作用下,Sb-SnO_2/炭膜对水中四环素的去除率显著提高,连续运行12 h,Sb-SnO_2/炭膜对四环素质量浓度为50 mg/L的水溶液中的四环素的去除率可达92.3%,预示着电催化膜在抗生素废水处理中将有很好的应用前景。

Carbon base membrane coated with nano Sb-SnO2 （SbdopedSnO2） was fabricated through sol-gel and heat-treatment process and was investigated by means of SEM, TEMandXRD. Thecarbon base membraneandSb-SnO2/carbon membranewere employedto treat aqueous tetacyclinesolution. Experimental results showed that both carbon base membrane and （Sb-SnO2）/carbon membrane were of microporousstructure, Sb-SnO2 with the size about 10 nm were uniformly coated on the surface of carbon membrane, moreover, the Sb-SnO2 possessed tetragonalrutile structure. Compared with the carbon basemembrane, Sh-SnO2/carbonmembrane improved the adsorption performance of tetracycline in water and the removal rate of carbon membrane for tetracycline increased significantly after coating with Sb-SnO2 under the condition of 2.5 V DC field. The tetracycline removal rate was still as high as 92.3% even the operation time was up to 12 hours. This indicates that there will be promising application prospects for electrocatalytic membrane in the field of treating antibiotic wastewater in the near future.