摘要
利用柠檬酸与氢氧化铜、氢氧化铝的酸碱反应制备柠檬酸铜铝复合盐,经500℃热分解制备出了铜铝均匀分布的铜铝复合氧化物。复合氧化物的结构及元素分布采用X射线衍射仪、X射线光电子能谱仪及透射电子显微镜-能谱联用技术进行了表征。以30%过氧化氢溶液为氧化剂,以铜铝复合氧化物为催化剂催化水中甲醛的降解,在25℃、过氧化氢浓度为80μmol/mL、甲醛浓度为0.998 mg/mL,通过分光光度法测定剩余甲醛含量并计算甲醛降解率为95.3%。通过加入自由基捕捉剂叔丁醇验证了该反应机理为自由基反应。实验考察了甲醛浓度、催化剂浓度、过氧化氢浓度及酸碱度对甲醛降解效果的影响。实验发现当甲醛浓度小于0.998 mg/mL,催化剂浓度为16 g/L,过氧化氢浓度为80μmol/mL,25℃,在pH=5~9范围内,甲醛降解率均在90%以上。
The Cu-Al complex oxides were prepared by the reaction of citric acid with copper hydroxide and aluminum hydroxide,and decomposed at 500℃.The structure and elemental distribution of the composite oxides were characterized by X-ray diffraction,X-ray photoelectron spectroscopy and transmission electron microscope.Using 30%hydrogen peroxide solution as oxidant(80μmol/mL)and the Cu-Al complex oxide as a catalyst,the concentration of formaldehyde was 0.998 mg/mL,the degradation of formaldehyde in water was studied at 25℃,the concentration of formaldehyde was detected by Spectrophotometer,the degradation rate of formaldehyde was 95.3%.The radical mechanism was verified by the addition of a free radical catcher(tert-butanol).The effects of formaldehyde concentration,catalyst concentration,hydrogen peroxide concentration and pH value on the degradation of formaldehyde were investigated.When the concentration of formaldehyde is less than 0.998 mg/mL,the concentration of catalyst is 16 g/L,the concentration of hydrogen peroxide is 80μmol/mL,25℃,the degradation rate of formaldehyde is more than 90%in the range of pH=5~9.
作者
马庆国
孟德乔
王如迎
杨雁
高一凡
MA Qingguo;MENG Deqiao;WANG Ruying;YANG Yan;GAO Yifan(Department of Chemistry and Chemical Engineering Taiyuan Institute of Technology,Taiyuan 030008,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第1期90-93,99,共5页
Technology of Water Treatment
基金
国家自然科学基金资助项目(22072105)
山西省1331工程项目。
关键词
甲醛
催化氧化
复合氧化物
分光光度法
formaldehyde
catalytic oxidation
compound oxide
spectrophotometer
