活性炭负载TiO_2电催化氧化处理酸性红B的研究  

Study on Degradation of Acid-red B in Wastewater by Electro-catalytic Oxidation with TiO_2-loaded Activated Carbon

作　　者：李飞贞 解迪[1] 赵远[1] 李雪[1] 梁文艳[1] 

机构地区：[1]北京林业大学环境科学与工程学院北京市水体污染源控制技术重点实验室,北京100083

出　　处：《环境科学与技术》2017年第1期17-23,共7页Environmental Science & Technology

基　　金：水体污染控制与治理技术重大专项(2013ZX07209001-003);中央高校基本科研业务费专项资金资助项目(2015ZCQ-HJ-02);北京林业大学科学研究项目(2015PY-08)

摘　　要：采用溶胶凝胶法制备颗粒活性炭负载二氧化钛(TiO_2/GAC)的催化粒子电极用于染料废水中酸性红B的降解去除。XRD图谱表明负载的TiO_2是锐钛矿相和金红石相的混合晶型,FESEM-EDS显示GAC表面Ti元素的质量百分比约为14.4%,N_2吸附脱附结果显示TiO_2/GAC的比表面积是708.5 m^2/g,孔容是0.395 4 cm^3/g,与GAC一样,是以微孔结构为主。在电流为0.6 A、电解质Na_2SO_4浓度为0.03 mol/L、水力停留时间为20 min条件下,TiO_2/GAC粒子电极对COD和TOC的去除率分别达到68.60%和45.12%相比GAC分别提高了35%和30%。紫外可见吸收光谱和分子荧光吸收光谱显示,电流的增加有利于酸性红B的降解,降解中间产物主要以类富里酸类物质为主酸性红B的降解会导致具荧光吸收性类富里酸物质浓度增加。A bench scale experimental study was conducted with catalytic particle electrodes of granular activated carbon coated by titanium dioxide prepared by the sol-gel method,which was applied to degradation of acid red B in dyeing waste water.The X-ray diffraction pattern showed that the loaded TiO2 was the mixed crystal type of anatase and rutile phase,and the FESEM-EDS（field emission scanning electron microscope energy dispersive） spectrometer indicated that the quality percentage of Ti element on the GAC surface was approximately 14.4%.Besides,N2 adsorption-desorption curves showed that the BET specific area and pore volume of TiO2/GAC were 708.5 m2/g and 0.395 4 cm3/g,respectively,and the particles were of mostly micro-pores,similar to GAC.The treatment of acid red B in the wastewater by use of TiO2/GAC was conducted under the condition,i.e.the current was 0.6 A,concentration of Na2SO4 0.03 mol/L,and the hydraulic retention time 20 min;and thus the removal efficiency in terms of COD and TOC by TiO2/GAC particle electrode were 68.60%and 45.12%,respectively,an increase of 35%for COD and 30%for TOC,in comparison with the use of GAC.The investigation on the dye degradation process by UV-Vis and fluorescence absorption spectra showed that the high current was conductive to the degradation of acid red B,and the intermediate degradation products were mainly consisted of fulvic acid-like substances;in addition,degradation of acid red B led to an increase of the concentration of fulvic acid-like substances that possessed fluorescent absorption character.

关 键 词：二氧化钛 电催化氧化 粒子电极 活性炭 酸性红B 

分 类 号：X703.1[环境科学与工程—环境工程]