摘要
为了提高SiO_(2)/TiO_(2)材料吸附?光催化氧化处理含氰废水的效果,使用重力自组装的聚苯乙烯微球(PS)作为硬模板,硅溶胶浸渍方法制备了大孔SiO_(2);进一步,使用溶胶凝胶法负载TiO_(2)颗粒在SiO_(2)载体上,制备了具有三维互联大孔结构的SiO_(2)/TiO_(2)复合材料,采用N_(2)吸附-脱附、扫描电子显微镜(SEM)、X射线衍射光谱分析(XRD)、傅氏转换红外光谱分析(FTIR)等手段对其进行表征。采用高压汞灯作为光源,探讨了TiO_(2)颗粒负载量(质量分数)、材料用量、催化时间和吸附时间对含氰废水降解效果的影响。实验结果表明:TiO_(2)颗粒负载量为10%,处理100 mL含氰废水材料使用量为0.35 g,经过1.0 h暗吸附和4.0 h光照后,总氰化物、铜、铁和锌的去除率分别为98.79%、99.10%、100.00%和92.26%。材料具有较强的热稳定性和重复利用性。吸附-催化机理研究结果表明:好的吸附性能可以促进催化分解过程,氧气捕获电子是提高催化效果的主要因素;氰根降解为无毒的氮氧化物和碳氧化物,金属以沉淀形式去除。
Introduction Photocatalytic oxidation degradation of cyanide is an effective technology to treat cyanide wastewater.TiO_(2)/SiO_(2) is a common catalyst.A preliminary research indicates that the pore structure of SiO_(2) has a certain influence on the degradation of cyanide and the removal of zinc and copper.If TiO_(2) particles are only loaded on the surface of mesoporous SiO_(2),the contact between the surface of SiO_(2) and the target substance in wastewater is reduced,thus affecting its adsorption performance.In this study,a macroporous SiO_(2) was prepared,and TiO_(2) particles were loaded on the surface and in three-dimensional interconnected channels of Si O_(2),thus increasing the adsorption sites on the surface of SiO_(2) and improving the adsorption performance of target pollutants,and enhancing its efficiency of treating cyanide in wastewater.Methods Gravity self-assembled polystyrene microspheres(PS)were used as hard templates,impregnated in silica sol for 8.0 h,dried in an oven at 60℃,and roasted in a Muffle furnace at 550℃for 10 h to obtain macroporous SiO_(2).SiO_(2)/TiO_(2) precursors were prepared by a sol-gel method and roasted at 500℃for 90 min.SiO_(2)/TiO_(2) composites with a three-dimensional interconnected macroporous structure were prepared.The wastewater and materials were placed and mixed in a beaker in a certain proportion.After stirring magnetically for a period of time,a small air pump was used to pump air into the bottom of the beaker at room temperature,and a high-pressure mercury lamp was used as the light source for photocatalytic oxidation of the wastewater.The effects of TiO_(2)particle loading mass,catalyst dosage,catalytic time,adsorption time on the treatment of cyanide wastewater were investigated.N_(2)adsorption-desorption,scanning electron microscopy(SEM),X-ray diffraction spectroscopy(XRD),Fourier transform infrared spectroscopy(FTIR)and other characterization techniques were used to determine the structural characteristics of the material and its adsorption-catalyt
作者
尉鹏海
张亚莉
黄耀国
陈琳琳
WEI Penghai;ZHANG Yali;HUANG Yaoguo;CHEN Linlin(College of Chemistry and Chemical Engineering,Shandong university of technology,Zibo 255000,Shandong,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2024年第1期98-108,共11页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51974180)。
关键词
光催化
吸附
含氰废水
金属氰络合物
photocatalysis
adsorption
cyanide wastewater
metal cyanide complexes
