摘要
为研究不同催化剂对臭氧降解印染废水的影响,以葡萄糖为原料,通过水热法制备碳微球,在焙烧的条件下,进而将微球碳化成中空。利用溶胶凝胶法制备单壳中空SiO_(2),单壳中空SiO_(2)@Cu O、单壳中空SiO_(2)@Zn O、单壳中空SiO_(2)@ZnO-CuO、双壳中空SiO_(2)@Zn O-CuO等催化剂。用酸性大红染料(硝基苯溶液)作为模拟印染废水,对所制备的催化剂进行性能评价,筛选催化性能最高的的催化剂;采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、N2吸脱附试验(BET)、能谱监测仪(EDS)等设备对催化剂的微结构、表面元素、形态及催化剂内部孔道分布进行表征。结果表明,双壳中空SiO_(2)@ZnO-CuO催化剂对臭氧氧化印染废水的去除效果最佳,对酸性大红染料废水去除率可达到99%以上。扫描电子显微镜及透射电子显微镜表征显示:SiO_(2)@ZnO-CuO催化剂为双壳中空球形结构,粒径在150~200 nm;负载在催化剂壳上的活性组分以氧化铜和氧化锌的形态存在,且氧化锌及氧化铜的衍射峰较尖锐,催化剂表面的活性组分结晶良好。臭氧氧化印染废水反应过程符合一级动力学方程,在添加催化剂的条件下,其反应速率常数为0.00588 min-1;在未添加催化剂的条件下,其反应速率常数仅为1.07026×10-4min-1。随着催化剂的添加,臭氧对印染废水的氧化效果显著提高。
To study the effect of different catalysts on the degradation of printing and dyeing wastewater by ozone,in this experiment,glucose is used as the raw material for preparing carbon microspheres of a spherical structure by hydrothermal method.In the case of roasting,it is carbonized into a hollow.Then the solgel method is used to prepare single-shell hollow SiO_(2),singleshell hollow SiO_(2)@CuO,single-shell hollow SiO_(2)@ZnO,singleshell hollow SiO_(2)@ZnO-CuO,double-shell hollow SiO_(2)@ZnOCuO,and other catalysts.The experiment uses acid scarlet dye as simulated printing and dyeing wastewater,evaluates the performance of the prepared catalysts and selects the catalyst with the highest catalytic performance;Then X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),N2 adsorption and desorption test(BET),energy spectrum monitor(EDS)and other equipment are used to characterize and analyze the microstructure,surface elements,morphology,and pore distribution of the catalyst.The results show that the double-shell hollow SiO_(2)@ZnO-CuO catalyst has the best removal performance on ozone oxidation printing and dyeing wastewater,and the removal rate of acid scarlet dye wastewater can reach more than 99%.Characterized by SEM and TEM,the SiO_(2)@ZnO-CuO catalyst has a double-shell hollow spherical structure with a particle size of about 150-200 nm.The active components supported on the catalyst shell are CuO and Zn O.The diffraction peaks of CuO and Zn O are sharper,indicating that the active components on the catalyst surface are well crystallized.The entire catalytic reaction process of ozone oxidation printing and dyeing wastewater conformed to the firstorder kinetic equation.The reaction rate constant is 0.00588 min-1 while that without the catalyst is 1.07026×10-4.With the addition of the catalyst,the oxidation effect of ozone on printing and dyeing wastewater is greatly improved.
作者
范文玉
刘健
谷精华
应志明
FAN Wen-yu;LIU Jian;GU Jing-hua;YING Zhi-ming(School of Environmental and Safety Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2021年第2期780-786,共7页
Journal of Safety and Environment
作者简介
范文玉,副教授,从事污水处理研究,676748879@qq.com。
