摘要
本文以3种溶剂合成了不同形貌特征的尖晶石型NiFe_(2)O_(4)纳米颗粒,并利用紫外-可见分光光度计测试了其对工业标准染料亚甲基蓝(MB)的降解效率。结果表明,使用乙二醇为溶剂合成的NiFe_(2)O_(4)纳米颗粒,催化剂用量为4g·L^(-1)、亚甲基蓝初始浓度为20mg·L^(-1)、pH值为2~4、温度为50℃、H_(2)O_(2)投加量为20mL·L^(-1),在紫外光源照射60min左右时,超过95.4%的亚甲基蓝染料被降解。表征结果表明,使用乙二醇为溶剂合成的NiFe_(2)O_(4)有着轮廓清晰的纺锤体性质,伴随着多孔性以及高透明度,可以有效地对紫外光进行吸收,更快地形成电子-空穴对,对亚甲基蓝进行分解。通过自由基淬灭实验对制备的NiFe_(2)O_(4)纳米粒子的光催化机理进行了研究,并通过重复循环实验研究了制备的NiFe_(2)O_(4)纳米粒子的稳定性。
This study synthesized spinel type NiFe_(2)O_(4) nanoparticles with different morphology characteristics using three solvents,and tested their degradation efficiency on the industrial standard dye methylene blue(MB)using a UV visible spectrophotometer.The results showed that when using ethylene glycol as the solvent to synthesize NiFe_(2)O_(4) nanoparticles,and the catalyst dosage was 4~5g·L^(-1),the initial concentration of methylene blue was 20mg·L^(-1),the pH value was 2~4,the temperature was 50℃,the hydrogen peroxide dosage was 20mL·L^(-1),more than 95.4%of the methylene blue dye was degraded when exposed to a UV light source for about 60 minutes.The characterization results indicate that NiFe_(2)O_(4) synthesized using ethylene glycol as a solvent has well-defined spindle properties,accompanied by porosity and high transparency,which can effectively absorb ultraviolet light and form electron hole pairs faster to decompose methylene blue.The photocatalytic mechanism of the prepared NiFe_(2)O_(4) nanoparticles was studied through free radical quenching experiments,and the stability of the prepared NiFe_(2)O_(4) nanoparticles was studied through repeated cycling experiments.
作者
赵仰成
李鑫
吴柏志
于硕硕
张婷
ZHAO Yang-cheng;LI Xin;WU Bai-zhi;YU Shuo-shuo;ZHANG Ting(Institute of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《化学工程师》
2024年第1期4-10,共7页
Chemical Engineer
基金
甘肃省科技重大专项(21ZD2JA001)。
