【摘要】 采用溶胶凝胶法制备颗粒活性炭负载二氧化钛（TiO₂/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TiO₂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%,N₂吸附脱附结果显示TiO₂/GAC的比表面积是708.5 m²/g,孔容是0.395 4 cm³/g,与GAC一样,是以微孔结构为主。在电流为0.6 A、电解质Na₂SO₄浓度为0.03 mol/L、水力停留时间为20 min条件下,TiO₂/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。更多还原

【Abstract】 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.更多还原