纳米尖晶石NiCo_(2)O_(4)活化过一硫酸盐降解甲硝唑  

Activation of peroxymonosulfate by nano spinel NiCo_(2)O_(4) for metronidazole degradation

作　　者：程韵然 杨晓婷 郑芯靓 杨利红 李庆永 CHENG Yunran;YANG Xiaoting;ZHENG Xinliang;YANG Lihong;LI Qingyong(School of Environmental Science and Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China;Auditing Department,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]广东石油化工学院环境科学与工程学院,广东茂名525000 [2]广东石油化工学院审计工作部,广东茂名525000

出　　处：《化工环保》2025年第2期225-233,共9页Environmental Protection of Chemical Industry

基　　金：广东省普通高校青年创新人才项目(2024KQNCX116);广东石油化工学院人才引进项目(2022rcyj2007);国家级大学生创新训练计划项目(24A029,24A030)。

摘　　要：采用沉淀—煅烧法制备了纳米尖晶石NiCo_(2)O_(4),将其作为一种活化过一硫酸盐(PMS)降解甲硝唑(MNZ)的非均相催化剂。表征结果显示,NiCo_(2)O_(4)具有典型的尖晶石结构、纳米颗粒尺寸(20~30 nm)、大比表面积(164.93 m^(2)/g)和丰富的介孔结构(孔径5.538 nm)。实验结果表明:在NiCo_(2)O_(4)用量为0.20 g/L、PMS用量为0.30 g/L、MNZ溶液初始pH为6.5(未调节)、反应温度为30℃的条件下降解10 mg/L MNZ 10 min,MNZ降解率达99.8%,PMS利用率为67.8%,反应速率常数高达0.6232 min^(-1),远高于单一PMS体系的0.0069 min^(-1);SO_(4)^(-)·在MNZ的降解过程中起主导作用;相同条件下NiCo_(2)O_(4)活化PMS体系对抗生素洛美沙星、左氧氟沙星、卡马西平和染料罗丹明B的降解率分别达91.2%、95.8%、82.3%和100%。Nano spinel NiCo_(2)O_(4) was prepared by a precipitation-calcination method and used as a heterogeneous catalyst to activate peroxymonosulfate(PMS)to degrade metronidazole(MNZ).The characterization results reveal that NiCo_(2)O_(4) has a typical spinel structure,nanoparticle size(20-30 nm),large specific surface area(164.93 m^(2)/g),and abundant mesoporous structure(pore size of 5.538 nm).The experimental results indicate that under the conditions of 0.20 g/L NiCo_(2)O_(4),0.30 g/L PMS,initial pH of MNZ solution of 6.5(unadjusted),and reaction temperature of 30℃,the degradation rate of 10 mg/L MNZ reaches 99.8%after 10 min,and the utilization rate of PMS is 67.8%.The reaction rate constant is 0.6232 min^(-1),which is much higher than 0.0069 min^(-1)of single PMS systems.SO_(4)^(-)·plays a leading role in the degradation of MNZ.Under the same conditions,the degradation rates of lomefloxacin,levofloxacin,carbamazepine,and rhodamine B in NiCo_(2)O_(4)-activated PMS system are 91.2%,95.8%,82.3%,and 100%,respectively.

关 键 词：NiCo_(2)O_(4)纳米催化剂 过一硫酸盐 甲硝唑 高级氧化技术 

分 类 号：X703.1[环境科学与工程—环境工程]